Merge origin/master into skill system branch
Use the new filesystem seam for skill file reads and system skill writes when ctx.fs is available, and include the skill tool in the generated tool catalog.
This commit is contained in:
Yichen Jiang
@@ -115,10 +115,11 @@ examples/ Runnable demos (not workspaces; see examples/AGENTS.md). Each is a
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teaching plugins. The app package bundles the agent-core spine +
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front-door cluster + boot glue (a bin). No start.ts. echo-agent =
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mock model + echo tool on dsh-stdio-agent (pnpm run demo:echo, no
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key). coding-agent = the real thing: DeepSeek V4 + bash tools +
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subagent + todo_write on the same app (pnpm run demo:coding, needs
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DEEPSEEK_API_KEY). acp-agent = the coding agent as an ACP server on
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dsh-acp-agent (pnpm run demo:acp, needs DEEPSEEK_API_KEY).
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key). coding-agent = the real thing: DeepSeek V4 + fs tools
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(read/write/edit) + bash tools + subagent + todo_write on the same
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app (pnpm run demo:coding, needs DEEPSEEK_API_KEY). acp-agent = the
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coding agent as an ACP server on dsh-acp-agent (pnpm run demo:acp,
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needs DEEPSEEK_API_KEY).
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cordis.snapshot.yml = the acp leaf with llm-replay for keyless
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snapshot replay.
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docs/ architecture.md — the design doc. module-graph.md — generated
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@@ -205,7 +206,7 @@ pnpm run hygiene
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out=$(printf 'echo ci smoke\n' | pnpm run demo:echo 2>&1)
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printf '%s\n' "$out" | grep -q '\[tool call\] echo({"text":"ci smoke"})'
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printf '%s\n' "$out" | grep -q '\[tool result\] ECHO: CI SMOKE'
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ls .sessions/_no-cwd/main-session-*.jsonl >/dev/null
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test -n "$(find .sessions -path '.sessions/cwd-*/main-session-*.jsonl' -type f -print -quit)"
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rm -rf .sessions
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pnpm exec vitest run --config vitest.e2e.config.ts packages/ui/stdio-agent/tests/built-bin.e2e.ts packages/ui/acp-agent/tests/built-bin.e2e.ts
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```
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@@ -240,6 +241,7 @@ Dev/test/demo run **unbuilt** via tsx + the source `paths` map in the root `tsco
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- **Plugins, not loop changes**: new behavior goes into a plugin on the documented extension seams (see the plugin sanity checklist in docs/architecture.md). Changing `agent-loop` requires updating that doc.
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- **Capability seams are three packages**: when adding a swappable capability (an execution backend, a provider integration, …), split it into *interface* (abstract service + vocabulary types, e.g. `bash/`), *implementation* (a concrete subclass, e.g. `bash-local/`), and *consumer* (what the model/plugins see, e.g. `tool-bash/`). Implementations and consumers then evolve independently — a sandboxed executor replaces `bash-local` without touching tool schemas. The LLM seam follows the same shape (`llm/` is interface + consumer surface; adapters are implementations). See docs/architecture.md § "Capability seams" for when NOT to split.
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- **Explicit > implicit at package seams**: interface/vocabulary types spell out every field a consumer must supply — no optional field that the implementation silently fills with a hidden `?? default`. Put defaulting in the owning implementation as an explicit step (a `resolve(request): Spec` method that turns the optional-field request into the required-field spec), not smuggled inside `run()`/`start()`. Example: `dsh-bash` splits `BashExecRequest` (optional `workdir`/`timeoutMs`, model-facing) from `BashExecSpec` (required, what `run`/`start` act on); the tool layer calls `ctx.bash.resolve()` between them. The reader of a `BashExecSpec` never has to wonder where the working directory came from.
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- **Opaque cross-boundary ids are branded, never bare `string`**: an identity that crosses a package seam and that a consumer must store-and-return but never parse (a backend-defined version token, a target key, a task/session/call id) is a `Branded<B>` from `@deepseek-ai/dsh-brand` with a same-named cast factory in the owning package — a zero-cost compile-time guard so semantically-distinct strings stop being interchangeable. Not every string needs it: author-readable names (`ToolName`) and closed code unions (`ErrorCode`) don't. See [Branded IDs everywhere they belong](docs/rfc/implemented/architecture/2026-06-20-branded-ids.md).
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- **An empty `catch` must name what it swallows and why nothing else can hit it**: a bare `catch {}` hides bugs. When you deliberately ignore a throw, the comment must (a) name the single expected failure, (b) say why ignoring it is correct — usually because the useful state was already captured *before* the `try` — and (c) make clear nothing else of consequence can reach the catch (ideally the `try` wraps a single statement). Example: the error-body `response.json()` parse in `dsh-llm-deepseek`'s adapter sets `code` + HTTP `status` from the status line before the `try`, so a malformed provider body can only cost a richer message, never the real error.
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- **Symmetry is usually more correct**: when two related values play parallel roles (a test fixture and its expected output, a request shape and its response shape, a buggy input and the test that checks the fix), give them parallel form — both named consts, or both inline, not one each way. Asymmetry is a smell that usually points at a missed extraction.
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- **Merging PRs**: always merge with a **merge commit** (`gh pr merge --merge`), never squash or rebase. The per-PR commit history is intentional — review-fix commits, regression-test commits, and the reasoning in each message are part of the record — and squashing flattens it away.
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@@ -276,7 +278,7 @@ In the **core** packages (`packages/llm/llm`, `packages/core/tools`, `packages/c
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Verbose documentation is fine **as long as docs and code stay strictly in sync**. Out-of-sync docs are worse than no docs. **When you change code, update its docs in the SAME change** — grep the package README and the module/JSDoc comments for the old behavior (config keys, defaults, error codes, wire field names, event names) and fix every hit. CI runs `pnpm run doc-sync` (`doc-typecheck` + `verify-cordis-catalog` + `verify-md-wrap` + `verify-md-links` + `verify-doc-refs` + `verify-package-paths` + `verify-rfc-classification` + `verify-type-equiv`), which typechecks every fenced `ts` block in `README.md`, `docs/**/*.md`, and `packages/*/*.md`, regenerates the cordis events/services catalog from source and fails if the committed copy is stale, asserts no hard-wrapped prose paragraphs, checks that every relative Markdown cross-link resolves, checks that every `docs/*.md` path cited in a source comment resolves, checks that every `packages/<path>` reference naming a real package resolves, checks that every RFC is filed under a valid class folder and listed in its index, and checks that every ` ```ts type-equiv ` doc block still matches its source type — across those files plus `AGENTS.md` / `packages/AGENTS.md` — but that scope does NOT catch prose drift in `AGENTS.md` / `packages/AGENTS.md` / `packages/README.md` (config keys, defaults, error codes), so keeping those in sync remains on the author. Every module has a module-level doc comment explaining its role. Every exported class, interface, type, function, and non-obvious method has a JSDoc that explains semantics (not just the name) — contracts (what events fire when), disposal behavior, error behavior, and extension intent. Internal helpers get docs only where non-obvious. Prefer one-liners when one line suffices.
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**Tag every new event with `@mode`.** The cordis events/services catalog ([docs/cordis-catalog/events-and-services.md](docs/cordis-catalog/events-and-services.md)) is GENERATED from source by `scripts/gen-cordis-catalog.ts` — never hand-edit it; run `pnpm run gen-cordis-catalog` and commit the result. When you add an event to an `interface Events` block, its JSDoc MUST carry a `@mode emit|waterfall|parallel` tag (the generator hard-errors without it): use `waterfall` when the signature ends with a `next: () => …` parameter (the listener transforms or vetoes via `next()`), `parallel` when the loop awaits a fan-out with no veto (e.g. an awaited `Promise<void> | void` checkpoint like `session/flush`), and `emit` for plain fire-and-forget notifications. The generator also cross-checks the tag against the signature where the shape is conclusive (a trailing `next` ⇒ waterfall) and hard-errors on a contradiction. Write the rest of the event's JSDoc to stand alone — it is the catalog entry's prose.
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||||
**Tag every new event with `@mode`.** The cordis events/services catalog ([docs/cordis-catalog/events-and-services.md](docs/cordis-catalog/events-and-services.md)) is GENERATED from source by `scripts/gen-cordis-catalog.ts` — never hand-edit it; run `pnpm run gen-cordis-catalog` and commit the result. When you add an event to an `interface Events` block, its JSDoc MUST carry a `@mode emit|waterfall|parallel|serial` tag (the generator hard-errors without it): use `waterfall` when the signature ends with a `next: () => …` parameter (the listener transforms or vetoes via `next()`), `parallel` when the loop awaits a fan-out and must run every listener (e.g. an awaited `Promise<void> | void` checkpoint like `session/flush`), `serial` when the loop awaits listeners in registration order and should isolate side effects (e.g. an ordered surface-mutation checkpoint like `agent/pre-step`; Cordis stops early if a listener returns a bail value, so `void` serial listeners must not return a semantic veto), and `emit` for plain fire-and-forget notifications. The generator also cross-checks the tag against the signature where the shape is conclusive (a trailing `next` ⇒ waterfall) and hard-errors on a contradiction. Write the rest of the event's JSDoc to stand alone — it is the catalog entry's prose.
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**The core-data-structures catalog is a maintained surface, not a write-once artifact.** [docs/core-data-structures/](docs/core-data-structures/core.md) catalogs the spine vocabulary (core.md) and the per-seam types (sub-pages). When a change adds, removes, or reshapes a type the catalog documents — a new `…Map` variant, a new content-block or session-event type, a field on `GenerateOptions`/`Agent`/`ToolDefinition`/a bash type, or a whole new core/seam type — update the catalog in the SAME change: edit the prose, and for a pasted ` ```ts type-equiv ` block, re-copy it verbatim and keep `scripts/type-equiv.manifest.json` 1:1 with the blocks. The `verify-type-equiv` gate catches a *drifted paste* of an already-documented type, but it canNOT tell you a brand-new core type was never documented — that judgment is on the author and the reviewer. The definition of "core" (the spine-vs-seam line) is in [core.md § What counts as "core"](docs/core-data-structures/core.md#what-counts-as-core); a genuinely spine-level new type belongs in core.md, a new capability's vocabulary on a sub-page. See [development.md](docs/development.md#documenting-types-verbatim-ts-type-equiv) for the `ts type-equiv` mechanics.
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+12
-4
@@ -25,6 +25,9 @@ For a catalog of the **data structures** this architecture moves around — the
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│ @deepseek-ai/dsh-bash-local (bash impl) │
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│ @deepseek-ai/dsh-tool-bash (bash tool schemas) │
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│ @deepseek-ai/dsh-tool-skill (skill loader tool) │
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│ @deepseek-ai/dsh-fs-local (filesystem impl) │
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│ @deepseek-ai/dsh-fs-policy (filesystem policy gate) │
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│ @deepseek-ai/dsh-tool-fs (filesystem tools+executor)│
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│ @deepseek-ai/dsh-subagent-* (subagent providers) │
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│ @deepseek-ai/dsh-session-persistence-jsonl (persistence impl)│
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├─────────────────────────────────────────────────────────────┤
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@@ -36,6 +39,7 @@ For a catalog of the **data structures** this architecture moves around — the
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│ @deepseek-ai/dsh-session-persistence (persistence seam) │
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│ @deepseek-ai/dsh-llm (abstract model service) │
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│ @deepseek-ai/dsh-bash (abstract bash executor) │
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│ @deepseek-ai/dsh-fs (filesystem provider seam) │
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│ @deepseek-ai/dsh-compact (abstract compaction seam) │
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│ @deepseek-ai/dsh-subagent (provider registry seam) │
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├─────────────────────────────────────────────────────────────┤
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@@ -59,6 +63,7 @@ Dependency rule: **extension** plugins depend on interface packages, never on `d
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| `ctx.agents` | `AgentRegistry` | dsh-agent | live `Agent` handles + the create/resume factory seam (returns an `AgentHandle` = `{ agent, dispose() }` for owned per-agent teardown) |
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| `ctx.agentLoop` | `AgentLoop` | dsh-agent-loop | creates `ReactLoopAgent`s and drives their loops |
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| `ctx.bash` | `BashExecutor` (abstract) | dsh-bash | bash execution seam: foreground runs + background tasks |
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| `ctx.fs` | `FileSystem` (abstract) | dsh-fs | filesystem provider seam: path resolution, stat, text read/stream, atomic writes/edits (optional version guard); owns the `fs/*` policy events |
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| `ctx.compact` | `CompactService` (abstract) | dsh-compact | compaction seam: decide when history is too large, summarize an older range into a single surface node |
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| `ctx.subagents` | `SubagentService` | dsh-subagent | named provider registry for delegating a task to child agents |
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@@ -76,6 +81,8 @@ Swappable capabilities are split into **three packages** so each part evolves in
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The LLM seam has the same topology folded differently: `dsh-llm` carries the interface (`LlmAdapter`) AND the consumer surface (`ctx.llm.stream()`), with adapters as implementation packages — there the consumer is the loop itself, not a swappable schema surface. Use the full three-package split when the consumer is independently replaceable; keep interface + consumer together when they are one concern. Don't split preemptively: a capability with one conceivable implementation and one consumer stays one package until proven otherwise.
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The filesystem capability follows the bash topology with a fourth layer, but the policy is contributed through an **event gate**, not a method service: `dsh-fs` owns the abstract `ctx.fs` provider seam (text IO + atomic mutation primitives whose version guard is optional) and the `fs/*` policy event vocabulary, `dsh-fs-local` provides the local backend, `dsh-tool-fs` is the model-facing `read`/`write`/`edit` tools AND the executor (it reads/writes/edits through `ctx.fs` directly, owns read windowing, dispatches the `fs/*` events), and `dsh-fs-policy` is a policy PLUGIN (no service) that decides the `fs/write-intent`/`fs/edit-intent` waterfalls and records on `fs/observed` to add observed-state + read-before-edit + version-guarded write/edit. Because the tool is not method-coupled to the policy, dropping `dsh-fs-policy` gracefully loses the policy and leaves the unconstrained bare provider rather than breaking the tool at a service-injection boundary. The demo agents (`coding-agent`, `acp-agent`) wire the full stack — `dsh-fs-local` + `dsh-fs-policy` + `dsh-tool-fs` — so `read`/`write`/`edit` are the default file surface (bash stays for shell/tests/search); the tools resolve a relative path against the caller's session cwd, matching bash ([the per-session cwd RFC](rfc/implemented/architecture/2026-07-02-fs-per-session-cwd.md)). See [the fs-policy event-gate RFC](rfc/implemented/architecture/2026-06-26-file-context-as-event-gate.md).
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> **"Capability" — two unrelated meanings.** (1) The *seam pattern* above ("one plugin provides a capability, another needs it") is realized by plain Cordis **services + `inject`**: a provider registers a service (`ctx.bash`, declared in `interface Context`); a consumer declares `inject: ['bash']` and its fiber stays pending until the service exists, tearing down via HMR if it later vanishes. No extra library is needed. (2) `@cordisjs/plugin-capability` is a different axis entirely — a **permission/capability-security** service (named permissions with inheritance/dependency, tested against a session via `ctx.capability.test`). It is a candidate for the deferred permissions/sandbox work (the `tools/execute` veto seam), NOT a mechanism for swapping implementations.
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## The vocabulary (dsh-llm)
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@@ -140,10 +147,11 @@ forever:
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drain queued → 'turn/start' → session('user/message'…) → emit agent/turn-start
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STEP loop:
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drain steering (late steering from previous step's listeners)
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session('step/start'); emit agent/step-start
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assembly = ctx.systemPrompt.assemble() ⟵ waterfall system-prompt/assemble
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await ctx.serial('agent/pre-step') ⟵ surface mutation (compaction) OUTSIDE the step
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session('step/start'); emit agent/step-start
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req = {model, system, tools, messages: session.deriveMessages(), signal}
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req = waterfall agent/request ⟵ hooks, compaction, model switch
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req = waterfall agent/request ⟵ hooks, model switch
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stream ctx.llm.stream(req) ⟵ waterfall llm/stream (raw chunks)
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session('assistant/chunk'); emit agent/stream-chunk
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if assembler.finish is error/aborted: throw ⟵ adapter's in-band error path →
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@@ -200,7 +208,7 @@ Every MVP feature (including the TODO-marked ones), with the mechanism that impl
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| `/loop` | on `agent/turn-end`, `send()` the next iteration; or force-continue |
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| Dynamic workflow | orchestrator plugin on `agent/turn-end` / `agent/step-end` driving `send`/`steer` (+ sub-agents later) |
|
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| Queued + steering messages | core `Agent.send()` / `Agent.steer()` |
|
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| Context compaction (auto + manual) | the `ctx.compact` seam ([dsh-compact](../packages/compact/compact)): a backend summarizes an older surface range into a single `user/message` `replace` op, bracketed by log-only `compact/*` events; auto = check token pressure at turn boundaries, manual = a `/compact` tool. See the [compaction capability-seam RFC](rfc/proposed/feature/2026-06-18-compaction-capability-seam.md) |
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| Context compaction (auto + manual) | the `dsh-compact` seam (`ctx.compact`) + a backend (`dsh-compact-basic`) on the serial `agent/pre-step` seam: a backend summarizes an older surface range into a single `user/message` `replace` op, bracketed by log-only `compact/*` events; auto = check token pressure before each step — runaway-turn survival, manual = a (deferred) `/compact` tool invoking the same `ctx.compact` routine. See the [compaction capability-seam RFC](rfc/implemented/feature/2026-06-18-compaction-capability-seam.md) |
|
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| System prompt configurability | `ctx.systemPrompt.section()` with ordering |
|
||||
| AGENTS.md (root) | a section provider reading the file |
|
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| AGENTS.md (subdir, on-touch) + file-change notices | `agent.inject()` from a watcher / tool-result listener |
|
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@@ -228,6 +236,6 @@ Code skeletons for the three plugin shapes (tool, hook/permission-gate, UI) and
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Tracked here deliberately — each is designed-for but not implemented:
|
||||
|
||||
- **Inter-agent channels beyond delegation** (shared state, streaming child output, background/poll semantics) remain out of scope for the current `ctx.subagents` seam.
|
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- **Compaction implementation** (auto thresholds, summarization prompts) on the `agent/request` seam, with its session-event types added by declaration merging.
|
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- **Compaction** — the `dsh-compact` seam (`ctx.compact`) and the `dsh-compact-basic` backend exist (auto thresholds, summarization on the serial `agent/pre-step` seam, `compact/*` session events via declaration merging). The model-facing `/compact` consumer tool is still deferred. See [the compaction capability-seam RFC](rfc/implemented/feature/2026-06-18-compaction-capability-seam.md).
|
||||
- **Parallel tool execution** (concurrency-safety hints on ToolDefinition).
|
||||
- **Session branching/tree** (pi-style entry tree) if needed beyond seed-based forking.
|
||||
@@ -11,7 +11,7 @@ The **harness tier** below (the `@deepseek-ai/dsh-*` packages) is the vocabulary
|
||||
|
||||
## Events
|
||||
|
||||
Dispatch modes: **emit** (fire-and-forget), **waterfall** (each listener gets `next()` and may transform or veto — see [waterfall semantics](../architecture.md#cordis-waterfall-semantics-important)), **parallel** (awaited fan-out, no veto).
|
||||
Dispatch modes: **emit** (fire-and-forget), **waterfall** (each listener gets `next()` and may transform or veto — see [waterfall semantics](../architecture.md#cordis-waterfall-semantics-important)), **parallel** (awaited fan-out; all listeners run), **serial** (awaited in registration order until one returns a bail value — anything other than `null`, `false`, or `undefined`).
|
||||
|
||||
### `agent/*`
|
||||
|
||||
@@ -49,7 +49,21 @@ A step or turn errored. The loop reports a failure here (plus the logger) even w
|
||||
|
||||
Types: [Agent](../core-data-structures/core.md)
|
||||
|
||||
Source: [`packages/core/agent/src/types.ts:220`](../../packages/core/agent/src/types.ts)
|
||||
Source: [`packages/core/agent/src/types.ts:254`](../../packages/core/agent/src/types.ts)
|
||||
|
||||
#### `agent/pre-step` — serial
|
||||
|
||||
Awaited pre-step surface-mutation checkpoint, fired once per step AFTER `turn/start` (and after the prior step closed) but BEFORE this step's `step/start` — so anything a listener appends lands OUTSIDE the step, between `turn/start`/`step/end` and the upcoming `step/start`. `step` is the number of the step about to start. The loop awaits `ctx.serial('agent/pre-step', …)` after assembling the system prompt, then opens the step and derives the request history ONCE from whatever the surface now holds. This is where compaction belongs: it mutates the session surface in place (shadowing an older range with a summary node) with its log-only `compact/*` records cleanly outside any step, and the single subsequent derive reflects the mutation — so there is no double-derive and no listener can see (or be expected to act on) an assembled `messages` array that does not exist yet.
|
||||
|
||||
Serial (awaited in registration order), not a waterfall: a listener mutates the surface as a side effect; there is nothing to transform, but the loop must wait for the mutation to complete before opening the step and deriving. Cordis `serial` bails early if a listener returns a bail value; this event is typed and documented as `void`, so listeners must not return a semantic veto value. `fullSystemPrompt` is the assembled prompt a listener needs to measure pressure (the system prompt counts toward the budget). `signal` cancels any in-flight work a listener starts (e.g. a summarization model call).
|
||||
|
||||
```ts cordis-catalog
|
||||
'agent/pre-step'(agent: Agent, turn: number, step: number, fullSystemPrompt: string, signal: AbortSignal): Promise<void> | void
|
||||
```
|
||||
|
||||
Types: [Agent](../core-data-structures/core.md)
|
||||
|
||||
Source: [`packages/core/agent/src/types.ts:214`](../../packages/core/agent/src/types.ts)
|
||||
|
||||
#### `agent/queued` — emit
|
||||
|
||||
@@ -65,7 +79,7 @@ Source: [`packages/core/agent/src/types.ts:156`](../../packages/core/agent/src/t
|
||||
|
||||
#### `agent/request` — waterfall
|
||||
|
||||
Waterfall: mutate the fully-assembled GenerateOptions before the model call (hooks, compaction, model switching, tool filtering, …). Call `next()` to delegate, or return without it to short-circuit.
|
||||
Waterfall: mutate the fully-assembled GenerateOptions before the model call (hooks, model switching, tool filtering, …). Call `next()` to delegate, or return without it to short-circuit. For surface mutation that must precede history derivation (compaction), use agent/pre-step instead — by the time this fires, `options.messages` is already derived.
|
||||
|
||||
```ts cordis-catalog
|
||||
'agent/request'(agent: Agent, turn: number, step: number, options: GenerateOptions, next: () => Promise<GenerateOptions>): Promise<GenerateOptions>
|
||||
@@ -73,7 +87,7 @@ Waterfall: mutate the fully-assembled GenerateOptions before the model call (hoo
|
||||
|
||||
Types: [Agent](../core-data-structures/core.md) · [GenerateOptions](../core-data-structures/core.md)
|
||||
|
||||
Source: [`packages/core/agent/src/types.ts:189`](../../packages/core/agent/src/types.ts)
|
||||
Source: [`packages/core/agent/src/types.ts:223`](../../packages/core/agent/src/types.ts)
|
||||
|
||||
#### `agent/status` — emit
|
||||
|
||||
@@ -97,7 +111,7 @@ Steering content was injected into a running turn.
|
||||
|
||||
Types: [Agent](../core-data-structures/core.md) · [ContentBlock](../core-data-structures/core.md) · [MessageSource](../core-data-structures/core.md)
|
||||
|
||||
Source: [`packages/core/agent/src/types.ts:214`](../../packages/core/agent/src/types.ts)
|
||||
Source: [`packages/core/agent/src/types.ts:248`](../../packages/core/agent/src/types.ts)
|
||||
|
||||
#### `agent/step-end` — emit
|
||||
|
||||
@@ -121,7 +135,7 @@ Waterfall: post-process the assembled assistant Message before tool dispatch (va
|
||||
|
||||
Types: [Agent](../core-data-structures/core.md) · [Message](../core-data-structures/core.md)
|
||||
|
||||
Source: [`packages/core/agent/src/types.ts:195`](../../packages/core/agent/src/types.ts)
|
||||
Source: [`packages/core/agent/src/types.ts:229`](../../packages/core/agent/src/types.ts)
|
||||
|
||||
#### `agent/step-start` — emit
|
||||
|
||||
@@ -145,7 +159,7 @@ A raw StreamChunk arrived from the model (token-level UI/log feed).
|
||||
|
||||
Types: [Agent](../core-data-structures/core.md) · [StreamChunk](../core-data-structures/llm-streaming.md)
|
||||
|
||||
Source: [`packages/core/agent/src/types.ts:209`](../../packages/core/agent/src/types.ts)
|
||||
Source: [`packages/core/agent/src/types.ts:243`](../../packages/core/agent/src/types.ts)
|
||||
|
||||
#### `agent/turn-continuation` — waterfall
|
||||
|
||||
@@ -157,7 +171,7 @@ Waterfall: override the turn-continuation decision. The default (computed by the
|
||||
|
||||
Types: [Agent](../core-data-structures/core.md)
|
||||
|
||||
Source: [`packages/core/agent/src/types.ts:202`](../../packages/core/agent/src/types.ts)
|
||||
Source: [`packages/core/agent/src/types.ts:236`](../../packages/core/agent/src/types.ts)
|
||||
|
||||
#### `agent/turn-end` — emit
|
||||
|
||||
@@ -183,6 +197,44 @@ Types: [Agent](../core-data-structures/core.md)
|
||||
|
||||
Source: [`packages/core/agent/src/types.ts:163`](../../packages/core/agent/src/types.ts)
|
||||
|
||||
### `fs/*`
|
||||
|
||||
#### `fs/edit-intent` — waterfall
|
||||
|
||||
Single-slot decision: produce the optional version guard for the next FileSystem.editText. The tool dispatches this as an unbound waterfall and supplies a default thunk returning `undefined` (unconditional edit of the current content — the bare provider; no `stat`). The `@deepseek-ai/dsh-fs-policy` policy listener returns `{ version: vObserved }`, or throws `FS_NOT_OBSERVED` if the actor is unset or has not observed the target. Does NOT call `next()`: one decision, first-wins (see Events.'fs/write-intent').
|
||||
|
||||
```ts cordis-catalog
|
||||
'fs/edit-intent'(target: FsTarget, actor: object | undefined, next: () => { version: FsVersion } | undefined | Promise<{ version: FsVersion } | undefined>): Promise<{ version: FsVersion } | undefined>
|
||||
```
|
||||
|
||||
Types: [FsTarget](../core-data-structures/filesystem.md) · [FsVersion](../core-data-structures/filesystem.md)
|
||||
|
||||
Source: [`packages/fs/fs/src/index.ts:117`](../../packages/fs/fs/src/index.ts)
|
||||
|
||||
#### `fs/observed` — emit
|
||||
|
||||
Record that an actor observed a target at a version, after a successful read/write/edit. Fire-and-forget (plain `emit`). A listener MUST be a synchronous, side-effect-only recorder (`@deepseek-ai/dsh-fs-policy`'s is a `WeakMap.set`): the tool does not guard the emit, so a listener that throws surfaces as the tool's `isError` result, and cordis `emit` does not await listener promises — async or fallible audit/telemetry does not belong here. No listener ⇒ nothing recorded. `actor` is the opaque tool-execution context.
|
||||
|
||||
```ts cordis-catalog
|
||||
'fs/observed'(target: FsTarget, version: FsVersion, actor: object | undefined): void
|
||||
```
|
||||
|
||||
Types: [FsTarget](../core-data-structures/filesystem.md) · [FsVersion](../core-data-structures/filesystem.md)
|
||||
|
||||
Source: [`packages/fs/fs/src/index.ts:129`](../../packages/fs/fs/src/index.ts)
|
||||
|
||||
#### `fs/write-intent` — waterfall
|
||||
|
||||
Single-slot decision: produce the write intent for the next FileSystem.writeText. The tool dispatches this as an unbound waterfall (no `this`) and supplies a default thunk returning `undefined` (unconditional create-or-overwrite — the bare provider). The `@deepseek-ai/dsh-fs-policy` policy listener returns `createIfAbsent` (unobserved actor) or `{ kind: 'replaceIfVersion', version: vObserved }` (observed) and does NOT call `next()` — one decision, not a composable chain. The slot is first-wins: the first non-`next()` decider (registration order, or `prepend`) occupies it; a second decider is a misconfiguration, not layering. `actor` is the opaque tool-execution context, never read here.
|
||||
|
||||
```ts cordis-catalog
|
||||
'fs/write-intent'(target: FsTarget, actor: object | undefined, next: () => FsWriteIntent | undefined | Promise<FsWriteIntent | undefined>): Promise<FsWriteIntent | undefined>
|
||||
```
|
||||
|
||||
Types: [FsTarget](../core-data-structures/filesystem.md) · [FsWriteIntent](../core-data-structures/filesystem.md)
|
||||
|
||||
Source: [`packages/fs/fs/src/index.ts:105`](../../packages/fs/fs/src/index.ts)
|
||||
|
||||
### `llm/*`
|
||||
|
||||
#### `llm/stream` — waterfall
|
||||
@@ -207,7 +259,7 @@ A session was created in the store.
|
||||
'session/created'(session: Session): void
|
||||
```
|
||||
|
||||
Source: [`packages/core/session/src/index.ts:33`](../../packages/core/session/src/index.ts)
|
||||
Source: [`packages/core/session/src/index.ts:34`](../../packages/core/session/src/index.ts)
|
||||
|
||||
#### `session/event` — emit
|
||||
|
||||
@@ -219,7 +271,7 @@ An event was appended to a session log (sync, fire-and-forget). This is the per-
|
||||
|
||||
Types: [SessionEvent](../core-data-structures/core.md)
|
||||
|
||||
Source: [`packages/core/session/src/index.ts:39`](../../packages/core/session/src/index.ts)
|
||||
Source: [`packages/core/session/src/index.ts:40`](../../packages/core/session/src/index.ts)
|
||||
|
||||
#### `session/flush` — parallel
|
||||
|
||||
@@ -229,7 +281,7 @@ Awaited durability checkpoint. The agent loop awaits `ctx.parallel('session/flus
|
||||
'session/flush'(session: Session): Promise<void> | void
|
||||
```
|
||||
|
||||
Source: [`packages/core/session/src/index.ts:48`](../../packages/core/session/src/index.ts)
|
||||
Source: [`packages/core/session/src/index.ts:49`](../../packages/core/session/src/index.ts)
|
||||
|
||||
### `subagent/*`
|
||||
|
||||
@@ -373,11 +425,36 @@ Implementations MUST honor:
|
||||
- **Blocking**: no compaction begins while another is in progress for the same session. The recommended mechanism is the log-recorded lock — append `compact/start` before the slow work and `compact/end` after (even on failure) — so the lock is visible to replay and crash recovery.
|
||||
|
||||
```ts cordis-catalog
|
||||
abstract compactIfNeeded( session: Session, systemPrompt?: string, model?: string, signal?: AbortSignal, ): Promise<CompactionResult | null>
|
||||
abstract compactRegion( session: Session, start: number, end: number, model: string, signal?: AbortSignal, ): Promise<CompactionResult>
|
||||
abstract compactIfNeeded( agent: CompactAgentContext, turn: number, step: number, fullSystemPrompt: string, signal: AbortSignal, ): Promise<CompactionResult | null>
|
||||
abstract compactRegion( session: Session, start: number, end: number, agent: CompactAgentContext, turn: number, step: number, signal?: AbortSignal, ): Promise<CompactionResult>
|
||||
```
|
||||
|
||||
Source: [`packages/compact/compact/src/index.ts:57`](../../packages/compact/compact/src/index.ts)
|
||||
Source: [`packages/compact/compact/src/index.ts:63`](../../packages/compact/compact/src/index.ts)
|
||||
|
||||
### `ctx.fs` — `FileSystem` (abstract seam)
|
||||
|
||||
Abstract filesystem provider service. Subclass, implement the six text-storage primitives, and load the subclass as a plugin — it registers as `ctx.fs` (one implementation per context; loading a second throws, cordis' standard duplicate-service behavior).
|
||||
|
||||
Semantics every backend must honor:
|
||||
|
||||
- resolve returns a stable FsTarget; the same underlying file reached by different input paths must yield the same `targetKey` so stale guards and target lookup agree across paths (e.g. through symlinks).
|
||||
- stat returns FsInfo metadata (never content) or `undefined` when the target is absent.
|
||||
- readText/streamText read the whole regular text file (the stream for large files); both own regular-file checks, UTF-8 decoding, binary/NUL rejection, and `FS_NOT_TEXT`.
|
||||
- writeText is atomic temp-file + rename. `expected` is OPTIONAL: omit it for an unconditional create-or-overwrite (the bare-provider default), or supply a FsWriteIntent to guard the write.
|
||||
- editText verifies `expected.version` BEFORE literal matching (so a stale edit reports `FS_STALE_VERSION`, not `FS_EDIT_NOT_FOUND`/ `FS_AMBIGUOUS_EDIT` against newer content), then applies literal replacement and writes atomically — all inside one mutation critical section. `expected` is OPTIONAL: omit it for an unconditional edit of the current content (a missing target still reports `FS_STALE_VERSION`).
|
||||
|
||||
```ts cordis-catalog
|
||||
abstract resolve(path: string, opts?: { cwd?: string }): Promise<FsTarget>
|
||||
abstract stat(target: FsTarget, signal?: AbortSignal): Promise<FsInfo | undefined>
|
||||
abstract readText(target: FsTarget, signal?: AbortSignal): Promise<string>
|
||||
abstract streamText(target: FsTarget, signal?: AbortSignal): Promise<AsyncIterable<string>>
|
||||
abstract writeText(target: FsTarget, content: string, expected?: FsWriteIntent, signal?: AbortSignal): Promise<FsWriteOutcome>
|
||||
abstract editText(target: FsTarget, edit: FsEditRequest, expected?: { version: FsVersion }, signal?: AbortSignal): Promise<FsEditOutcome>
|
||||
```
|
||||
|
||||
Types: [FsEditOutcome](../core-data-structures/filesystem.md) · [FsEditRequest](../core-data-structures/filesystem.md) · [FsInfo](../core-data-structures/filesystem.md) · [FsTarget](../core-data-structures/filesystem.md) · [FsVersion](../core-data-structures/filesystem.md) · [FsWriteIntent](../core-data-structures/filesystem.md) · [FsWriteOutcome](../core-data-structures/filesystem.md)
|
||||
|
||||
Source: [`packages/fs/fs/src/index.ts:158`](../../packages/fs/fs/src/index.ts)
|
||||
|
||||
### `ctx.llm` — `LlmService`
|
||||
|
||||
@@ -430,7 +507,7 @@ get(id: SessionId): Session | undefined
|
||||
list(): Session[]
|
||||
```
|
||||
|
||||
Source: [`packages/core/session/src/index.ts:321`](../../packages/core/session/src/index.ts)
|
||||
Source: [`packages/core/session/src/index.ts:322`](../../packages/core/session/src/index.ts)
|
||||
|
||||
### `ctx.skills` — `SkillService`
|
||||
|
||||
@@ -441,7 +518,7 @@ async get(name: string, options: SkillLookupOptions = {}): Promise<SkillDefiniti
|
||||
async renderModelListing(options: SkillLookupOptions = {}): Promise<string>
|
||||
```
|
||||
|
||||
Source: [`packages/core/skill/src/index.ts:107`](../../packages/core/skill/src/index.ts)
|
||||
Source: [`packages/core/skill/src/index.ts:108`](../../packages/core/skill/src/index.ts)
|
||||
|
||||
### `ctx.subagents` — `SubagentService`
|
||||
|
||||
@@ -481,7 +558,7 @@ async execute(exec: ToolExecution): Promise<ToolExecutionResult>
|
||||
|
||||
Types: [ToolDefinition](../core-data-structures/tools.md) · [ToolExecution](../core-data-structures/tools.md) · [ToolExecutionResult](../core-data-structures/tools.md)
|
||||
|
||||
Source: [`packages/core/tools/src/index.ts:277`](../../packages/core/tools/src/index.ts)
|
||||
Source: [`packages/core/tools/src/index.ts:287`](../../packages/core/tools/src/index.ts)
|
||||
|
||||
## Inherited tier (cordis core + loader/hmr/timer)
|
||||
|
||||
@@ -508,7 +585,7 @@ The framework surface every plugin inherits, beyond the harness vocabulary above
|
||||
### Inherited `ctx` members
|
||||
|
||||
- `ctx.on / ctx.once` — Register an event listener (disposable). ([`vendor/cordis/src/events.ts:29`](../../vendor/cordis/src/events.ts))
|
||||
- `ctx.emit / ctx.parallel / ctx.serial / ctx.bail / ctx.waterfall` — Dispatch an event (sync / awaited / first-non-nullish / veto-chain). ([`vendor/cordis/src/events.ts:29`](../../vendor/cordis/src/events.ts))
|
||||
- `ctx.emit / ctx.parallel / ctx.serial / ctx.bail / ctx.waterfall` — Dispatch an event (sync / awaited / first-bail / veto-chain). ([`vendor/cordis/src/events.ts:29`](../../vendor/cordis/src/events.ts))
|
||||
- `ctx.plugin / ctx.inject` — Load a plugin / declare required services. ([`vendor/cordis/src/registry.ts:144`](../../vendor/cordis/src/registry.ts))
|
||||
- `ctx.effect` — Register a disposable side effect tied to the fiber. ([`vendor/cordis/src/fiber.ts:9`](../../vendor/cordis/src/fiber.ts))
|
||||
- `ctx.get / ctx.set / ctx.provide / ctx.accessor / ctx.mixin` — Low-level service-store access and binding. ([`vendor/cordis/src/reflect.ts:7`](../../vendor/cordis/src/reflect.ts))
|
||||
|
||||
@@ -1,6 +1,6 @@
|
||||
# Compaction
|
||||
|
||||
The compaction seam — a [capability seam](../rfc/implemented/architecture/2026-06-13-capability-seams.md) split like bash: interface ([dsh-compact](../../packages/compact/compact), `ctx.compact`), implementation (a backend such as `dsh-compact-basic`, deferred), and consumer (a `/compact` tool, deferred). Compaction is **one optional capability**, not part of the agent-loop spine — so its vocabulary lives here, not in [core.md](core.md). A tokenizer- or template-based backend is a sibling package implementing the same interface. Unlike bash, the interface necessarily depends on `dsh-session` and `dsh-llm`: its verbs are defined over a `Session` and its output is the `ContentBlock` vocabulary (see the [compaction capability-seam RFC](../rfc/proposed/feature/2026-06-18-compaction-capability-seam.md)).
|
||||
The compaction seam — a [capability seam](../rfc/implemented/architecture/2026-06-13-capability-seams.md) split like bash: interface ([dsh-compact](../../packages/compact/compact), `ctx.compact`), implementation (a backend such as [dsh-compact-basic](../../packages/compact/compact-basic)), and consumer (a `/compact` tool, deferred). Compaction is **one optional capability**, not part of the agent-loop spine — so its vocabulary lives here, not in [core.md](core.md). A tokenizer- or template-based backend is a sibling package implementing the same interface. Unlike bash, the interface necessarily depends on `dsh-session` and `dsh-llm`: its verbs are defined over a `Session` and its output is the `ContentBlock` vocabulary (see the [compaction capability-seam RFC](../rfc/implemented/feature/2026-06-18-compaction-capability-seam.md)).
|
||||
|
||||
Source: [`packages/compact/compact/src/types.ts`](../../packages/compact/compact/src/types.ts)
|
||||
|
||||
@@ -11,7 +11,7 @@ Compaction extends [`SessionEventMap`](session.md) with three event types via de
|
||||
| Event | Payload | Role |
|
||||
|---|---|---|
|
||||
| `compact/start` | `{ turn }` | acquires the log-recorded lock |
|
||||
| `compact/summary` | `{ summary, shadowedRange, shadowedSeqs, shadowedTokenCount }` | provenance: the summary blocks, the shadowed seq range, and the estimated token count |
|
||||
| `compact/summary` | `{ summary, shadowedRange, shadowedSeqs, shadowedTokenCount }` | provenance: the summary blocks, the shadowed surface-boundary pair (`start`/`end` seqs — a position span, not a numeric interval), the shadowed seqs in surface order, and the estimated token count |
|
||||
| `compact/end` | `{ turn, error? }` | releases the lock (`error` set when summarization threw) |
|
||||
|
||||
The lock brackets the **whole** operation: `compact/start` is appended first, then summarization, the `compact/summary` provenance record, and the `user/message` replacement all land, and only then `compact/end`. Releasing the lock last turns a crash mid-operation into a detectable orphaned lock (a `compact/start` with no matching `compact/end`) rather than a `compact/end` that falsely claims compaction finished.
|
||||
@@ -32,9 +32,16 @@ interface CompactionResult {
|
||||
endSeq: number
|
||||
/** The summary content blocks produced by the backend. */
|
||||
summary: ContentBlock[]
|
||||
/** The seq range that was shadowed [start, end] inclusive. */
|
||||
/**
|
||||
* The surface-boundary pair that was shadowed: the seqs of the first
|
||||
* (`start`) and last (`end`) surface nodes of the replaced range. A
|
||||
* surface-POSITION span, not a numeric seq interval — after a prior replace
|
||||
* lands a fresh high-seq summary node at an older range's position, `start`
|
||||
* can be GREATER than `end`. {@link CompactionResult.shadowedSeqs} is the
|
||||
* authoritative set of shadowed nodes, in surface order.
|
||||
*/
|
||||
shadowedRange: { start: number; end: number }
|
||||
/** The seq numbers of all shadowed surface nodes. */
|
||||
/** The seqs of all shadowed surface nodes, in surface order. */
|
||||
shadowedSeqs: number[]
|
||||
/** Estimated token count of the shadowed content. */
|
||||
shadowedTokenCount: number
|
||||
@@ -43,4 +50,6 @@ interface CompactionResult {
|
||||
|
||||
## The service
|
||||
|
||||
`CompactService` (`ctx.compact`, abstract — defined in [`packages/compact/compact/src/index.ts`](../../packages/compact/compact/src/index.ts)) declares two abstract methods: `compactIfNeeded(session, systemPrompt?, model?, signal?)` checks token pressure and compacts an older range if the history is too large (returning `null` when nothing needs it), and `compactRegion(session, start, end, model, signal?)` forcibly summarizes surface nodes `[start, end]` into a single replacement node. Both take an optional `signal: AbortSignal` that a backend summarizing via `ctx.llm.stream()` must forward into the call's `GenerateOptions.signal`, so an abort or dispose tears down the in-flight summarization. The entire strategy — token estimation, retention policy, event sequencing, summarization — is a HOW decision owned by the implementation.
|
||||
`CompactService` (`ctx.compact`, abstract — defined in [`packages/compact/compact/src/index.ts`](../../packages/compact/compact/src/index.ts)) declares two abstract methods: `compactIfNeeded(agent, turn, step, fullSystemPrompt, signal)` checks token pressure and compacts an older range if the history is too large (returning `null` when nothing needs it), and `compactRegion(session, start, end, agent, turn, step, signal?)` forcibly summarizes surface nodes `[start, end]` into a single replacement node. `compactIfNeeded`'s parameters are all required — the loop's `agent/pre-step` checkpoint supplies the agent, lifecycle context, assembled `fullSystemPrompt`, and turn `signal`. A backend summarizing via `ctx.llm.stream()` must forward `signal` into the call's `GenerateOptions.signal`, so an abort or dispose tears down the in-flight summarization. The entire strategy — token estimation, retention policy, event sequencing, summarization — is a HOW decision owned by the implementation.
|
||||
|
||||
Auto-compaction runs on the serial `agent/pre-step` loop seam (fired once per step, after `turn/start` and BEFORE the step opens and its request history is derived), not the `agent/request` waterfall: compaction mutates the session surface in place — with its log-only `compact/*` records landing cleanly outside any step — and the loop derives the request from the already-compacted surface. Retention is turn-agnostic — the only structural guard is tool-pairing balance (a compacted region's edges are balanced cuts on the surface, so it never splits a step's tool-calls from their results), so a single runaway turn that alone exceeds the window compacts its own early closed steps rather than being retained verbatim. The backend that ships this (`dsh-compact-basic`) documents the retention walk, summary shrink validation, bounded re-compaction, and the crash/recoverable failure taxonomy.
|
||||
@@ -20,6 +20,7 @@ Everything else is documented on a **sub-page**, not here. The rule that draws t
|
||||
| [persistence.md](persistence.md) | the durability seam: `SessionPersistence`, JSONL + SQLite backends, `session/flush`, crash recovery, `SessionHeader` |
|
||||
| [tools.md](tools.md) | `ToolDefinition` full fields, the schema DSL, `ToolExecution`/`ToolResult`, tool-presentation UI types, the `tools/execute` waterfall |
|
||||
| [bash.md](bash.md) | the bash executor seam: `BashExecRequest`/`Spec`, `BashRunResult`, background `BashTask`s |
|
||||
| [filesystem.md](filesystem.md) | the filesystem seam: `FsTarget`, read/write/edit outcomes, observed-file state, `FsErrorCode` |
|
||||
| [compaction.md](compaction.md) | the compaction seam: the `compact/*` session events, `CompactionResult`, the `CompactService` interface |
|
||||
| [subagent.md](subagent.md) | the subagent seam: the named-provider registry, `SubagentStartRequest`/`Result`/`Run`, the start-time-vs-runtime capability split |
|
||||
|
||||
@@ -205,7 +206,7 @@ type SessionEvent<T extends SessionEventType = SessionEventType> = {
|
||||
/**
|
||||
* Seq numbers of events that are provenance sources of this event
|
||||
* (e.g. the `assistant/chunk` seqs that built an `assistant/message`,
|
||||
* or the surface nodes shadowed by a compaction marker).
|
||||
* or the surface nodes shadowed by a compaction replace node).
|
||||
*/
|
||||
sourceEventSeqs?: number[]
|
||||
/** How this event entered the surface; absent for non-surface events. */
|
||||
@@ -306,7 +307,7 @@ interface Agent {
|
||||
}
|
||||
```
|
||||
|
||||
`AgentStatus` is `'idle' | 'running' | 'disposed'`. `AgentId` is a branded string. `AgentOptions` (`model?`, `systemPrompt?`) is merge-extensible — plugins add creation options by declaration merging. The `agent/*` event taxonomy (lifecycle, turn/step boundaries, the `agent/request`/`agent/step-result`/`agent/turn-continuation` waterfalls) is in [architecture.md § Event taxonomy](../architecture.md#event-taxonomy).
|
||||
`AgentStatus` is `'idle' | 'running' | 'disposed'`. `AgentId` is a branded string. `AgentOptions` (`model?`, `systemPrompt?`) is merge-extensible — plugins add creation options by declaration merging. The `agent/*` event taxonomy (lifecycle, turn/step boundaries, the serial `agent/pre-step` surface-mutation seam, and the `agent/request`/`agent/step-result`/`agent/turn-continuation` waterfalls) is in [architecture.md § Event taxonomy](../architecture.md#event-taxonomy).
|
||||
|
||||
## `ToolDefinition`
|
||||
|
||||
|
||||
@@ -0,0 +1,133 @@
|
||||
# Filesystem
|
||||
|
||||
The filesystem stack is split across four packages: a provider seam ([dsh-fs](../../packages/fs/fs), `ctx.fs`, text IO + atomic mutation primitives whose version guard is optional), a local implementation ([dsh-fs-local](../../packages/fs/fs-local), local disk), a policy plugin ([dsh-fs-policy](../../packages/fs/fs-policy), observed-state + read-before-edit + version-guarded write/edit, contributed through the `fs/*` event gate — NO service), and a consumer ([dsh-tool-fs](../../packages/fs/tool-fs), the model-facing `read`/`write`/`edit` tools, which is also the EXECUTOR — it reads/writes/edits through `ctx.fs` directly and owns read windowing). Filesystem access is an optional capability, not part of the agent-loop spine, so its vocabulary lives here rather than in [core.md](core.md). A sandboxed, remote, virtual, or project-scoped backend can implement the same `FileSystem` service without changing the policy plugin or the tool schemas.
|
||||
|
||||
The model is **additive, not subtractive**: `ctx.fs` alone is a complete, unconstrained text-storage seam (`write` unconditionally creates-or-overwrites, `edit` unconditionally replaces literal text). `dsh-fs-policy` is a plugin that *adds* policy on top by deciding the `fs/*` waterfalls; removing it leaves the bare provider rather than breaking the tool, because the tool is not method-coupled to the policy. A deployment that loads `dsh-tool-fs` is expected to also load `dsh-fs-policy` so the default behavior is read-before-write/edit.
|
||||
|
||||
Provider source: [`packages/fs/fs/src/types.ts`](../../packages/fs/fs/src/types.ts) and [`packages/fs/fs/src/index.ts`](../../packages/fs/fs/src/index.ts). Policy source: [`packages/fs/fs-policy/src/types.ts`](../../packages/fs/fs-policy/src/types.ts). Read-rendering source: [`packages/fs/tool-fs/src/read-render.ts`](../../packages/fs/tool-fs/src/read-render.ts).
|
||||
|
||||
## Target identity and metadata (provider seam)
|
||||
|
||||
Every operation resolves a user-supplied path to an opaque backend target first. Consumers may display `displayPath`, but must not parse `targetKey` (a branded opaque id) or assume it is a local absolute path.
|
||||
|
||||
```ts type-equiv
|
||||
interface FsTarget {
|
||||
inputPath: string
|
||||
targetKey: FsTargetKey
|
||||
displayPath: string
|
||||
}
|
||||
```
|
||||
|
||||
The backend owns file-version tokens — the freshness token a write/edit guards against. The policy plugin stores them for stale checks; consumers do not interpret them. Both ids are branded opaque strings.
|
||||
|
||||
```ts type-equiv
|
||||
type FsTargetKey = Branded<'FsTargetKey'>
|
||||
```
|
||||
|
||||
```ts type-equiv
|
||||
type FsVersion = Branded<'FsVersion'>
|
||||
```
|
||||
|
||||
`stat` returns metadata (never content), or `undefined` when the target is absent. `type` lets the tool reject directories/special files before reading, and `size` lets it choose `readText` vs `streamText` without probing by failure.
|
||||
|
||||
```ts type-equiv
|
||||
interface FsInfo {
|
||||
version: FsVersion
|
||||
type: 'file' | 'directory' | 'other'
|
||||
size?: number
|
||||
}
|
||||
```
|
||||
|
||||
## Write and edit guards (provider seam)
|
||||
|
||||
Both `writeText` and `editText` take their version guard OPTIONALLY: omit it for an unconditional (bare-provider) mutation, supply it to guard. `writeText`'s guard is an `FsWriteIntent` — `createIfAbsent` creates a missing target and rejects an existing one with `FS_NOT_OBSERVED`; `replaceIfVersion` replaces only when the target exists at the observed version, else `FS_STALE_VERSION`. Omitting `expected` unconditionally creates-or-overwrites. The union itself carries only the two guarded intents; "no guard" is expressed by omission, so write and edit share one symmetric `expected?` shape.
|
||||
|
||||
```ts type-equiv
|
||||
type FsWriteIntent =
|
||||
| { kind: 'createIfAbsent' }
|
||||
| { kind: 'replaceIfVersion'; version: FsVersion }
|
||||
```
|
||||
|
||||
```ts type-equiv
|
||||
interface FsWriteOutcome {
|
||||
operation: 'create' | 'update'
|
||||
version: FsVersion
|
||||
}
|
||||
```
|
||||
|
||||
`editText` is a provider-level mutation, not a `read` plus `write` composed elsewhere. When guarded it verifies the expected version BEFORE literal matching (so a stale edit reports `FS_STALE_VERSION`, not a match failure against newer content); unguarded it edits the current content. Either way it applies the replacement and writes atomically — keeping matching, line-ending handling, the stale check, and atomic replacement inside one mutation critical section — and a missing target reports `FS_STALE_VERSION` on both paths.
|
||||
|
||||
```ts type-equiv
|
||||
interface FsEditRequest {
|
||||
oldString: string
|
||||
newString: string
|
||||
replaceAll: boolean
|
||||
}
|
||||
```
|
||||
|
||||
```ts type-equiv
|
||||
interface FsEditOutcome {
|
||||
replacements: number
|
||||
replaceAll: boolean
|
||||
version: FsVersion
|
||||
}
|
||||
```
|
||||
|
||||
## The fs policy events (provider-seam vocabulary)
|
||||
|
||||
`dsh-fs` owns three events the tool dispatches and the policy plugin listens for, so the emitter (`dsh-tool-fs`) and the listener (`dsh-fs-policy`) share a vocabulary without the emitter depending on the policy plugin. They carry only `dsh-fs` vocabulary plus an opaque `object` actor — no model-facing concepts and no agent/session owner structure.
|
||||
|
||||
`fs/write-intent` and `fs/edit-intent` are **single-slot decision waterfalls**: the tool dispatches each with a default thunk returning `undefined` (the bare provider), and a listener fully decides without calling `next()`. The slot is first-wins by registration order — the policy plugin owning it is a deployment convention, not an enforced invariant. `fs/observed` is a fire-and-forget recording event dispatched with a plain `ctx.emit`; its listener MUST be synchronous and side-effect-only, because the tool does NOT guard the emit — a throwing listener would surface as the tool's `isError` result for a mutation that already succeeded. The generated catalog shows the exact signatures on [events-and-services.md](../cordis-catalog/events-and-services.md).
|
||||
|
||||
## Execution context (policy plugin)
|
||||
|
||||
The policy plugin needs just enough execution context to derive the observed-state owner by narrowing the opaque `object` actor the `fs/*` events carry. `ToolExecution` satisfies this shape, so `dsh-tool-fs` passes its execution object through as the actor without making `dsh-fs-policy` import the tool, agent, or session packages.
|
||||
|
||||
```ts type-equiv
|
||||
interface FsPolicyExec {
|
||||
agent?: {
|
||||
session?: object
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
## Read outcome (consumer / read rendering)
|
||||
|
||||
A text read is bounded by line window, byte cap, and backend limits. The outcome the model-facing `read` tool renders carries the file's version at read time; there is no `full`/`partial` view — authorization is freshness-based, so any windowed read can authorize a later write/edit when the file is unchanged. Read windowing and this outcome shape live in `dsh-tool-fs` (the executor that owns the read), not in the policy plugin.
|
||||
|
||||
```ts type-equiv
|
||||
interface FileReadOutcome {
|
||||
offset: number
|
||||
limit: number
|
||||
lines: FileTextLine[]
|
||||
totalLines: number
|
||||
truncatedByBytes?: true
|
||||
version: FsVersion
|
||||
}
|
||||
```
|
||||
|
||||
## Observed-file state (policy plugin)
|
||||
|
||||
Observed state is a `WeakMap<owner, Map<targetKey, { version }>>` held inside the `dsh-fs-policy` plugin. An entry exists **iff** the owner has read, written, OR edited that target (every success emits `fs/observed`), so its presence is the prior-observation record — there is no separate `hasRead` flag and no view distinction. The owner is derived from the event actor (normally `exec.agent.session`), treated as opaque and never read. A successful read/write/edit refreshes the recorded version for that owner; disposal drops everything (HMR safety).
|
||||
|
||||
## Error taxonomy (provider seam)
|
||||
|
||||
Filesystem failures use stable `FsErrorCode` strings carried by `FsError` (`HarnessError`). The tool registry preserves `{ name, code }` on error results, so retry, permission, and UI layers can branch without parsing text.
|
||||
|
||||
```ts type-equiv
|
||||
type FsErrorCode =
|
||||
| 'FS_NOT_FOUND'
|
||||
| 'FS_NOT_TEXT'
|
||||
| 'FS_NOT_REGULAR_FILE'
|
||||
| 'FS_STALE_VERSION'
|
||||
| 'FS_NOT_OBSERVED'
|
||||
| 'FS_AMBIGUOUS_EDIT'
|
||||
| 'FS_EDIT_NOT_FOUND'
|
||||
| 'FS_ABORTED'
|
||||
```
|
||||
|
||||
`FS_NOT_OBSERVED` means the policy plugin has no prior-observation record for this owner (or a `createIfAbsent` hit an existing file). `FS_STALE_VERSION` means the backend version no longer matches the observed one (or an edit hit a missing target). Freshness authorization has no partial/full distinction, so there is no `FS_PARTIAL_OBSERVATION`.
|
||||
|
||||
## The service and the plugin
|
||||
|
||||
`FileSystem` (`ctx.fs`, abstract) owns the provider primitives: `resolve`, `stat`, `readText`, `streamText`, `writeText`, and `editText`. `dsh-fs-policy` registers **no service** — it is a plugin that adds policy through the `fs/*` event gate: it decides the write/edit intent waterfalls (supplying `createIfAbsent`/`replaceIfVersion`/`{ version }` or throwing `FS_NOT_OBSERVED`) and records on `fs/observed`. The executor is `dsh-tool-fs`: it reads/writes/edits through `ctx.fs`, dispatches the waterfalls, and emits the recording event. The generated wiring catalog shows the exact `ctx.fs` signatures on [events-and-services.md](../cordis-catalog/events-and-services.md#ctxfs--filesystem-abstract-seam).
|
||||
@@ -80,7 +80,7 @@ type SessionEvent<T extends SessionEventType = SessionEventType> = {
|
||||
/**
|
||||
* Seq numbers of events that are provenance sources of this event
|
||||
* (e.g. the `assistant/chunk` seqs that built an `assistant/message`,
|
||||
* or the surface nodes shadowed by a compaction marker).
|
||||
* or the surface nodes shadowed by a compaction replace node).
|
||||
*/
|
||||
sourceEventSeqs?: number[]
|
||||
/** How this event entered the surface; absent for non-surface events. */
|
||||
|
||||
@@ -105,7 +105,7 @@ A waterfall listener receives `(exec, next)`: call `next()` to proceed (possibly
|
||||
|
||||
## Tool-presentation UI vocabulary
|
||||
|
||||
How a tool wants its call shown in a UI (an editor tool-call card, a CLI log line), provider-neutral so a tool describes itself without depending on any client protocol. `presentCall` returns a `ToolCallPresentation` (pending state: `title`, `kind`, `rawInput`, `content`, optional `terminal`); `presentResult` returns a `ToolResultPresentation` (completed state: replacement `title`, reformatted `content`, terminal `output`/exit). `ToolCallKind` (`'read' | 'edit' | 'delete' | 'move' | 'search' | 'execute' | 'fetch' | 'other'`) picks an icon. A `ToolTerminal` asks a capable UI to render the call as a terminal card (cwd header, output, exit-status pill).
|
||||
How a tool wants its call shown in a UI (an editor tool-call card, a CLI log line), provider-neutral so a tool describes itself without depending on any client protocol. `presentCall` returns a `ToolCallPresentation` (pending state: `title`, `kind`, `rawInput`, `content`, `locations` — `{ path, line? }[]` files the call reads/modifies, for editor follow-along — and optional `terminal`); `presentResult` returns a `ToolResultPresentation` (completed state: replacement `title`, reformatted `content`, terminal `output`/exit). `ToolCallKind` (`'read' | 'edit' | 'delete' | 'move' | 'search' | 'execute' | 'fetch' | 'other'`) picks an icon. A `ToolTerminal` asks a capable UI to render the call as a terminal card (cwd header, output, exit-status pill).
|
||||
|
||||
> These shapes carry a `FIXME(tool-presentation)` in source: they grew incrementally and the call-vs-result terminal split is muddy. Before more tools/UIs depend on them, they will be redesigned (a tagged union over card kinds) and pinned in an RFC, migrating `dsh-tool-bash` and the ACP bridge together. Treat the field-level shapes here as provisional; the source is authoritative.
|
||||
|
||||
|
||||
@@ -0,0 +1,113 @@
|
||||
# Terminology
|
||||
|
||||
本表约定本仓库的中英术语统一译法。
|
||||
|
||||
| English | 中文 | 备注 |
|
||||
|---|---|---|
|
||||
| ACP | ACP | 首次出现可写：ACP（Agent Client Protocol） |
|
||||
| AI | AI | 首次出现可写：人工智能（AI） |
|
||||
| API | API | |
|
||||
| CLI | CLI | 首次出现可写：命令行界面（CLI） |
|
||||
| Cordis | Cordis | 保留英文 |
|
||||
| Function Calling | Function Calling | 首次出现可写：Function Calling（函数调用） |
|
||||
| HMR | HMR | 首次出现可写：热模块替换（HMR） |
|
||||
| JSON Schema | JSON Schema | |
|
||||
| JSONL | JSONL | |
|
||||
| lint | lint | |
|
||||
| loader | loader | |
|
||||
| LLM | LLM | 首次出现可写：大语言模型（LLM） |
|
||||
| MCP | MCP | |
|
||||
| RAG | RAG | 首次出现可写：检索增强生成（RAG） |
|
||||
| SDK | SDK | |
|
||||
| SSE | SSE | 首次出现可写：SSE（Server-Sent Events） |
|
||||
| agent | agent | 首次出现可写：agent（智能体） |
|
||||
| agent loop | agent loop | |
|
||||
| fiber | fiber | 首次出现可写：fiber（插件运行时） |
|
||||
| fixture | fixture | 指测试前置数据或环境 |
|
||||
| fork | fork | 保留英文 |
|
||||
| harness | harness | 保留英文 |
|
||||
| manifest | manifest | 描述模块或工具元数据的文件 |
|
||||
| schema DSL | schema DSL | |
|
||||
| schema | schema | 保留英文 |
|
||||
| seam | seam | 首次出现可写：seam（扩展点） |
|
||||
| skill | skill | 首次出现可写：skill（技能） |
|
||||
| spawn | spawn | 保留英文 |
|
||||
| steering | steering | 首次出现可写：steering（中途引导） |
|
||||
| subagent | subagent | 首次出现可写：subagent（子 agent） |
|
||||
| transcript | transcript | 首次出现可写：transcript（文本记录）；指会话渲染给用户或编辑器的完整文本，区别于事件日志（event log） |
|
||||
| waterfall | waterfall | 首次出现可写：waterfall（瀑布式事件） |
|
||||
| wire format | 协议格式 | 首次出现可写：协议格式（wire format） |
|
||||
| adapter contract | 适配器契约 | 首次出现可写：适配器契约（adapter contract） |
|
||||
| adapter | 适配器 | |
|
||||
| append-only | 仅追加 | |
|
||||
| artifact | 产物 | |
|
||||
| block | 块 | |
|
||||
| background task | 后台任务 | |
|
||||
| backend | 后端 | |
|
||||
| capability | 能力 | |
|
||||
| cancel | 取消 | |
|
||||
| checkpoint | 检查点 | |
|
||||
| chunk | 分片 | |
|
||||
| compaction | compaction | 首次出现可写：compaction（上下文压缩）；正文优先保留英文 |
|
||||
| consumer | 消费方 | |
|
||||
| content block | 内容块 | |
|
||||
| config | 配置 | |
|
||||
| context | 上下文 | |
|
||||
| context compaction | 上下文压缩 | 首次出现可写：上下文压缩（context compaction） |
|
||||
| coverage | 覆盖率 | |
|
||||
| crash recovery | 崩溃恢复 | |
|
||||
| dispose | dispose | 首次出现可写：dispose（释放资源）；正文优先保留英文 |
|
||||
| durability | 持久性 | |
|
||||
| event log | 事件日志 | |
|
||||
| event | 事件 | |
|
||||
| event stream | 事件流 | |
|
||||
| executor | 执行器 | |
|
||||
| extension | 扩展 | |
|
||||
| finish reason | 结束原因 | |
|
||||
| foreground run | 前台运行 | |
|
||||
| hook | 钩子 | |
|
||||
| implementation | 实现 | |
|
||||
| inference | 推理（inference） | 每次提及时保留英文括注，避免与 reasoning 混淆 |
|
||||
| injection | 注入 | |
|
||||
| interface | 接口 | |
|
||||
| integration | 集成 | |
|
||||
| memory | memory / 记忆 / 内存 | 按上下文区分：agent memory 译为“记忆”；resource/memory usage 译为“内存” |
|
||||
| message | 消息 | |
|
||||
| mod | 模组 | 区别于 module（模块）；plugin 译作「插件」 |
|
||||
| model provider | 模型提供方 | |
|
||||
| module | 模块 | |
|
||||
| permission | 权限 | |
|
||||
| persistence | 持久化 | |
|
||||
| pipeline | 流水线 | |
|
||||
| plugin | 插件 | mod 对应“模组” |
|
||||
| prompt | 提示词 | |
|
||||
| provider | 提供方 | |
|
||||
| provider-neutral | 提供方无关 | |
|
||||
| quality gate | 质量门禁 | |
|
||||
| registry | 注册表 | |
|
||||
| reasoning | 推理（reasoning） | 需要和 inference 区分时保留英文括注；`reasoning_content` 译为“思考内容” |
|
||||
| replay | 回放 | |
|
||||
| resume | 恢复 | |
|
||||
| runtime | 运行时 | |
|
||||
| sandbox | 沙箱 | |
|
||||
| service | 服务 | |
|
||||
| session | 会话 | |
|
||||
| session event | 会话事件 | |
|
||||
| snapshot | 快照 | |
|
||||
| spine | 主干 | |
|
||||
| step | 步骤 | |
|
||||
| stream | 流 | |
|
||||
| streaming | 流式输出 | |
|
||||
| system prompt | 系统提示词 | |
|
||||
| taxonomy | 分类体系 | |
|
||||
| token usage | token 用量 | |
|
||||
| thinking | thinking | API 字段保留；模型模式译为“思考” |
|
||||
| tool | 工具 | |
|
||||
| tool call | 工具调用 | |
|
||||
| tool result | 工具结果 | |
|
||||
| tool schema | 工具 schema | |
|
||||
| toolkit | 工具包 | |
|
||||
| turn | 轮次 | |
|
||||
| typecheck | 类型检查 | |
|
||||
| vocabulary | 词汇 | |
|
||||
| workflow | 工作流 | |
|
||||
+19
-1
@@ -10,6 +10,8 @@ graph TD
|
||||
bash --> brand
|
||||
llm --> brand
|
||||
bash-local --> bash
|
||||
fs --> brand
|
||||
fs --> llm
|
||||
llm-deepseek --> llm
|
||||
llm-pi-ai --> llm
|
||||
session --> brand
|
||||
@@ -20,9 +22,15 @@ graph TD
|
||||
agent --> session
|
||||
compact --> llm
|
||||
compact --> session
|
||||
fs-local --> fs
|
||||
fs-policy --> fs
|
||||
llm-replay --> llm
|
||||
llm-replay --> session
|
||||
session-persistence --> session
|
||||
compact-basic --> agent
|
||||
compact-basic --> compact
|
||||
compact-basic --> llm
|
||||
compact-basic --> session
|
||||
invariants --> agent
|
||||
invariants --> llm
|
||||
invariants --> session
|
||||
@@ -31,6 +39,7 @@ graph TD
|
||||
session-persistence-sqlite --> session
|
||||
session-persistence-sqlite --> session-persistence
|
||||
skill --> agent
|
||||
skill --> fs
|
||||
skill --> llm
|
||||
tools --> agent
|
||||
tools --> llm
|
||||
@@ -56,6 +65,10 @@ graph TD
|
||||
tool-bash --> bash
|
||||
tool-bash --> llm
|
||||
tool-bash --> tools
|
||||
tool-fs --> fs
|
||||
tool-fs --> llm
|
||||
tool-fs --> system-prompt
|
||||
tool-fs --> tools
|
||||
tool-skill --> agent
|
||||
tool-skill --> llm
|
||||
tool-skill --> skill
|
||||
@@ -109,24 +122,29 @@ graph TD
|
||||
| `bash` | `brand` |
|
||||
| `llm` | `brand` |
|
||||
| `bash-local` | `bash` |
|
||||
| `fs` | `brand`, `llm` |
|
||||
| `llm-deepseek` | `llm` |
|
||||
| `llm-pi-ai` | `llm` |
|
||||
| `session` | `brand`, `llm` |
|
||||
| `system-prompt` | `llm` |
|
||||
| `agent` | `brand`, `llm`, `session` |
|
||||
| `compact` | `llm`, `session` |
|
||||
| `fs-local` | `fs` |
|
||||
| `fs-policy` | `fs` |
|
||||
| `llm-replay` | `llm`, `session` |
|
||||
| `session-persistence` | `session` |
|
||||
| `compact-basic` | `agent`, `compact`, `llm`, `session` |
|
||||
| `invariants` | `agent`, `llm`, `session` |
|
||||
| `session-persistence-jsonl` | `session`, `session-persistence` |
|
||||
| `session-persistence-sqlite` | `session`, `session-persistence` |
|
||||
| `skill` | `agent`, `llm` |
|
||||
| `skill` | `agent`, `fs`, `llm` |
|
||||
| `tools` | `agent`, `llm`, `system-prompt` |
|
||||
| `ui-stdio` | `agent`, `llm`, `session` |
|
||||
| `acp` | `agent`, `llm`, `session`, `session-persistence`, `tools` |
|
||||
| `agent-loop` | `agent`, `llm`, `session`, `session-persistence`, `system-prompt`, `tools` |
|
||||
| `subagent` | `agent`, `llm`, `tools` |
|
||||
| `tool-bash` | `agent`, `bash`, `llm`, `tools` |
|
||||
| `tool-fs` | `fs`, `llm`, `system-prompt`, `tools` |
|
||||
| `tool-skill` | `agent`, `llm`, `skill`, `tools` |
|
||||
| `tool-todo` | `agent`, `session`, `tools` |
|
||||
| `agent-core` | `agent`, `agent-loop`, `invariants`, `llm`, `session`, `skill`, `system-prompt`, `tool-bash`, `tool-skill`, `tools` |
|
||||
|
||||
+7
-1
@@ -44,7 +44,6 @@ Do NOT write one for a mechanical or local choice (a variable name, a one-file r
|
||||
| [Agent Client Protocol (ACP) support for external editors](proposed/feature/2026-06-14-acp-agent-client-protocol.md) | 2026-06-14 |
|
||||
| [Multiplex concurrent ACP sessions over one connection](proposed/feature/2026-06-14-acp-multi-session.md) | 2026-06-14 |
|
||||
| [Optional Code Mode — model writes TypeScript against an SDK of all tools](proposed/feature/2026-06-15-optional-code-mode.md) | 2026-06-15 |
|
||||
| [Compaction as a capability seam (abstract contract + basic backend)](proposed/feature/2026-06-18-compaction-capability-seam.md) | 2026-06-18 |
|
||||
|
||||
### Simplification
|
||||
|
||||
@@ -82,7 +81,9 @@ Do NOT write one for a mechanical or local choice (a variable name, a one-file r
|
||||
|
||||
| Title | First proposed |
|
||||
|---|---|
|
||||
| [Filesystem tool schemas — model-facing read/write/edit shapes](implemented/feature/2026-06-17-filesystem-tool-schemas.md) | 2026-06-17 |
|
||||
| [Rich ACP bash rendering — the terminal card (`_meta`) and command classification](implemented/feature/2026-06-18-acp-terminal-and-tool-rendering.md) | 2026-06-18 |
|
||||
| [Compaction as a capability seam (abstract contract + basic backend)](implemented/feature/2026-06-18-compaction-capability-seam.md) | 2026-06-18 |
|
||||
| [Subagent capability seam](implemented/feature/2026-06-21-subagent-capability-seam.md) | 2026-06-21 |
|
||||
| [ACP subagent backend (out-of-process delegation)](implemented/feature/2026-06-22-acp-subagent-backend.md) | 2026-06-22 |
|
||||
| [The `todo_write` tool — model task list as event-sourced session state](implemented/feature/2026-06-29-todo-write-tool.md) | 2026-06-29 |
|
||||
@@ -97,6 +98,7 @@ Do NOT write one for a mechanical or local choice (a variable name, a one-file r
|
||||
| [Prune dead methods from the persistence seam](implemented/simplification/2026-06-20-prune-dead-seam-methods.md) | 2026-06-20 |
|
||||
| [Keep one public stop primitive](implemented/simplification/2026-06-20-public-agent-stop-surface.md) | 2026-06-20 |
|
||||
| [Fold trace-only session facts into load-bearing events](implemented/simplification/2026-06-20-collapse-trace-only-session-events.md) | 2026-06-20 |
|
||||
| [Split the filesystem seam — provider text mutations plus the `dsh-fs-policy` plugin](implemented/simplification/2026-06-26-fsspec-style-fs-seam.md) | 2026-06-26 |
|
||||
|
||||
### Architecture
|
||||
|
||||
@@ -114,12 +116,15 @@ Do NOT write one for a mechanical or local choice (a variable name, a one-file r
|
||||
| [Two LLM adapters as a design-verification twin](implemented/architecture/2026-06-13-twin-llm-adapters.md) | 2026-06-13 |
|
||||
| [Session persistence as an abstract service over `SessionEvent`](implemented/architecture/2026-06-14-session-persistence.md) | 2026-06-14 |
|
||||
| [Every session event is enclosed in a turn](implemented/architecture/2026-06-15-turn-enclosure-invariant.md) | 2026-06-15 |
|
||||
| [Filesystem capability seam — ctx.fs, local backend, and model-facing filesystem tools](implemented/architecture/2026-06-17-filesystem-capability-seam.md) | 2026-06-17 |
|
||||
| [Shared persistence write coordinator](implemented/architecture/2026-06-18-shared-persistence-write-coordinator.md) | 2026-06-18 |
|
||||
| [Agent lifecycle and ownership seams](implemented/architecture/2026-06-18-agent-lifecycle-and-ownership-seams.md) | 2026-06-18 |
|
||||
| [Session surface — a linked list over the event log for LLM message derivation](implemented/architecture/2026-06-18-session-surface.md) | 2026-06-18 |
|
||||
| [Reorganize packages into a modular hierarchy](implemented/architecture/2026-06-20-package-hierarchy.md) | 2026-06-20 |
|
||||
| [Branded IDs everywhere they belong](implemented/architecture/2026-06-20-branded-ids.md) | 2026-06-20 |
|
||||
| [Extract example apps into packages](implemented/architecture/2026-06-20-extract-example-app-packages.md) | 2026-06-20 |
|
||||
| [Make `dsh-fs-policy` an event-gate plugin, not a method interface](implemented/architecture/2026-06-26-file-context-as-event-gate.md) | 2026-06-26 |
|
||||
| [Resolve filesystem paths against the caller's session cwd](implemented/architecture/2026-07-02-fs-per-session-cwd.md) | 2026-07-02 |
|
||||
|
||||
### Process
|
||||
|
||||
@@ -135,6 +140,7 @@ Do NOT write one for a mechanical or local choice (a variable name, a one-file r
|
||||
| [Core-data-structures catalog and the `ts type-equiv` drift gate](implemented/process/2026-06-20-core-data-structures-catalog.md) | 2026-06-20 |
|
||||
| [Generated cordis events + services catalog](implemented/process/2026-06-20-generated-cordis-catalog.md) | 2026-06-20 |
|
||||
| [Classify RFCs by kind via path-encoded subdirectories](implemented/process/2026-06-20-rfc-classification.md) | 2026-06-20 |
|
||||
| [Generated tool-schema catalog (boot-and-harvest)](implemented/process/2026-07-02-tool-schema-catalog.md) | 2026-07-02 |
|
||||
|
||||
### Testing
|
||||
|
||||
|
||||
@@ -10,6 +10,6 @@ Update it **in place** to state the current truth. Do **not** leave the outdated
|
||||
|
||||
### This is not a license to rewrite the *decision*
|
||||
|
||||
Keeping the shipped-state description current is about **facts** (paths, names, structure, defaults) — not about silently flipping the **decision and its rationale** into a different one. If the underlying choice itself is reversed or materially changed (not just relocated), that is a new decision: write a new RFC and cross-link, per [rfc/README.md](../README.md) ("An RFC is never edited into a different decision"). The line: a refactor that moves where the decision is *realized* → edit this RFC to match; a reversal of *what was decided* → a new RFC.
|
||||
Keeping the shipped-state description current is about **facts** (paths, names, structure, defaults) — not about silently flipping the **decision and its rationale** into a different one. The "new RFC" escape hatch is for **macro** changes — a genuine reversal of *what was decided* or its rationale — NOT for renames, moves, or structural relocations. A rename is always a fact to fix **in place**: leaving a package/symbol/path at its old name (even with a "was renamed to…" aside) only confuses a reader who greps the current tree for a name that no longer exists. So: the package was renamed, a symbol changed, a plugin moved, the decision is now realized through a different mechanism → edit this RFC to state the current names and structure. Only a reversal of *what was decided* → a new RFC and cross-link, per [rfc/README.md](../README.md) ("An RFC is never edited into a different decision").
|
||||
|
||||
When in doubt, ask whether a reader following this RFC to the code would land on something real. If not, it needs updating.
|
||||
@@ -0,0 +1,183 @@
|
||||
# RFC: Filesystem capability seam — ctx.fs, local backend, and model-facing filesystem tools
|
||||
|
||||
Status: implemented
|
||||
|
||||
## Problem
|
||||
|
||||
The harness has a concrete `bash` capability seam (`dsh-bash` / `dsh-bash-local` / `dsh-tool-bash`), but filesystem operations are about to be added as model-facing tools without an equivalent seam. If `read`, `write`, and `edit` directly use `node:fs`, the model-facing tool package will own filesystem execution policy, local path resolution, atomic write behavior, text decoding, symlink behavior, and edit semantics all at once.
|
||||
|
||||
That couples three concerns that change independently:
|
||||
|
||||
1. The filesystem contract: what operations plugins can ask for.
|
||||
2. The backend: local disk now, sandboxed/remote/project-scoped filesystem later.
|
||||
3. The consumer surface: model-facing `read` / `write` / `edit` schemas and result formatting.
|
||||
|
||||
Without a `ctx.fs` interface, swapping local filesystem access for a sandboxed or remote backend would churn the tool schemas, demos, and prompt guidance even when the model-facing contract should stay stable. It also makes permission/sandbox boundaries harder to reason about: a `cwd` option can look like a sandbox even though it is only a base path unless an explicit backend or `tools/execute` policy enforces containment.
|
||||
|
||||
We need the filesystem tools to land in the same capability-seam shape as bash before they become a public package surface.
|
||||
|
||||
## Proposal
|
||||
|
||||
Introduce filesystem access as a first-class capability seam following [the capability-seam RFC](../../implemented/architecture/2026-06-13-capability-seams.md):
|
||||
|
||||
1. `@deepseek-ai/dsh-fs` (`packages/fs/fs`) owns the abstract `ctx.fs` service, the filesystem vocabulary types, and the `fs/*` policy event vocabulary.
|
||||
2. `@deepseek-ai/dsh-fs-local` (`packages/fs/fs-local`) provides the first implementation, backed by the local filesystem.
|
||||
3. `@deepseek-ai/dsh-tool-fs` (`packages/fs/tool-fs`) provides the model-facing `read`, `write`, and `edit` tools over `ctx.fs`, and is the executor that dispatches the `fs/*` events.
|
||||
|
||||
The consumer package depends only on the interface package, never on `dsh-fs-local`. A deployment that wants a different backend loads a different provider for `ctx.fs` without changing the tool schemas or model-facing prompt guidance.
|
||||
|
||||
The read-before-write/edit and observed-state policy is a fourth package, `@deepseek-ai/dsh-fs-policy` (`packages/fs/fs-policy`), contributed through the `fs/*` event gate rather than living on `ctx.fs`. This RFC established the three-package seam; the split of policy off the provider base class is decided by [the split-fs-seam RFC](../simplification/2026-06-26-fsspec-style-fs-seam.md), and its realization as an event-gate plugin (not a method service) by [the event-gate RFC](2026-06-26-file-context-as-event-gate.md). This document is updated to describe that landed four-package shape.
|
||||
|
||||
The first backend is deliberately local-only: `dsh-fs-local` implements `ctx.fs` against the host filesystem. Future sibling backends can provide sandboxed, remote, virtual, or project-scoped filesystems behind the same interface.
|
||||
|
||||
The first consumer is deliberately text-file-only: `dsh-tool-fs` exposes model-facing `read`, `write`, and `edit` tools for UTF-8 text files. Future consumers can add directory listing, search/glob, binary-safe operations, file watching, or higher-level project operations without changing the local backend package, as long as the needed capability exists on `ctx.fs`.
|
||||
|
||||
Filesystem permissions and sandboxing are not implied by this split. The local backend resolves relative paths from its configured base directory, but containment policy is a separate decision: either a stricter `ctx.fs` implementation enforces it, or a permission/sandbox plugin wraps `tools/execute` and vetoes calls before they reach the consumer.
|
||||
|
||||
Read-before-write/edit and observed-state are policy, contributed by the `dsh-fs-policy` plugin through the `fs/*` event gate — NOT stored on `ctx.fs`. The provider seam offers an optional version guard on its mutations (`writeText`/`editText` take an optional expectation); the policy plugin decides that guard by listening on `fs/write-intent`/`fs/edit-intent` and records observed versions on `fs/observed`. The executor (`dsh-tool-fs`) passes the current tool execution context as the opaque event actor; the policy plugin derives the observed-state owner from it, normally `exec.agent.session`. `dsh-fs` treats the actor as opaque and never reads it; `dsh-tool-fs` never reaches into the policy plugin. Authorization is version freshness: any read records the file's version, and a later write/edit is authorized as long as the file is unchanged. (This RFC first placed the observed-state store on `ctx.fs`; the split to `dsh-fs-policy` on the `fs/*` event gate is decided by [the split-fs-seam](../simplification/2026-06-26-fsspec-style-fs-seam.md) and [event-gate](2026-06-26-file-context-as-event-gate.md) RFCs.)
|
||||
|
||||
## Package topology
|
||||
|
||||
The filesystem seam uses the same dependency direction as the bash trio:
|
||||
|
||||
```text
|
||||
@deepseek-ai/dsh-tool-fs --depends on--> @deepseek-ai/dsh-fs <--depends on-- @deepseek-ai/dsh-fs-local
|
||||
consumer interface implementation
|
||||
```
|
||||
|
||||
`@deepseek-ai/dsh-fs` depends only on `cordis` plus the repo-wide `HarnessError` base from `@deepseek-ai/dsh-llm`. It declares the `ctx.fs` key, the abstract `FileSystem` service, the vocabulary types shared by backends and consumers, the filesystem error vocabulary, and the `fs/*` policy event vocabulary. It carries no observed-state store and no owner-derivation shape; the events pass an opaque `object` actor that the provider never reads, and the `dsh-fs-policy` plugin owns the owner-derivation shape and the observed-state store on top of those events.
|
||||
|
||||
`@deepseek-ai/dsh-fs-local` depends on `@deepseek-ai/dsh-fs` and `cordis`. It subclasses `FileSystem`, registers itself as `ctx.fs`, owns local-backend configuration such as the base directory, and contains all direct `node:fs` / `node:path` access. It holds no observed-state store — freshness is a version token the backend mints and the policy plugin records.
|
||||
|
||||
`@deepseek-ai/dsh-tool-fs` depends on `@deepseek-ai/dsh-fs`, `@deepseek-ai/dsh-tools`, `@deepseek-ai/dsh-system-prompt`, and `cordis`. It registers model-facing tools and prompt sections. It must not import `node:fs`, `node:path`, or `@deepseek-ai/dsh-fs-local`; filesystem execution always goes through `ctx.fs`. If the implementation needs concrete agent or session helper types, those dependencies belong in `tool-fs`; they must not leak back into `dsh-fs`.
|
||||
|
||||
The root `tool-fs` plugin registers the full filesystem tool suite (`read`, `write`, and `edit`) by composing the per-tool registration helpers. It injects `fs` and never imports an implementation package.
|
||||
|
||||
## `ctx.fs` contract
|
||||
|
||||
`@deepseek-ai/dsh-fs` owns a semantic filesystem service. It is higher-level than `readFile` / `writeFile` so `tool-fs` does not reimplement path resolution, versioning, text decoding, binary rejection, pagination, atomic replacement, symlink behavior, or literal edit semantics.
|
||||
|
||||
The exact TypeScript signatures are implementation details for the PR, but the interface must cover four semantic operations:
|
||||
|
||||
- Resolve a model/plugin-supplied path into a backend-defined target.
|
||||
- Read a bounded UTF-8 text page from a target.
|
||||
- Create or replace a UTF-8 text file.
|
||||
- Edit an existing UTF-8 text file by literal replacement.
|
||||
|
||||
The provider seam also carries the freshness hooks that policy builds on — but the observed-state store and owner derivation live in the `dsh-fs-policy` plugin, not on `ctx.fs`:
|
||||
|
||||
- The backend mints an opaque `version` token per target (in `stat` and in every read/mutation outcome).
|
||||
- `writeText`/`editText` take an OPTIONAL version expectation: omit it for an unconditional bare-provider mutation, or supply it to guard the mutation inside the backend's atomic critical section.
|
||||
- The `dsh-fs-policy` plugin decides that expectation on `fs/write-intent`/`fs/edit-intent` and records observed versions on `fs/observed`, keyed by an owner it derives from the opaque event actor (normally `exec.agent.session`).
|
||||
|
||||
Authorization is version freshness, not a full/partial view distinction: any read records the target's version, and a later write/edit is authorized as long as the file is still at that version — so a windowed read of lines 100-150 authorizes an edit of line 120. The observed-state store is a `WeakMap<owner, Map<targetKey, version>>` inside `dsh-fs-policy`; `dsh-fs` holds none of it and treats the actor as opaque. (This RFC first modeled a `FileState` cache with `full`/`partial` views on `ctx.fs`; the split-fs-seam and event-gate RFCs replaced that with the freshness-based policy plugin described here.)
|
||||
|
||||
Path resolution should be explicit and allowed to be async. Local resolution may only normalize a path, but sandboxed/remote/project-scoped backends may need I/O to resolve a user-supplied path into a stable target identity.
|
||||
|
||||
Resolved targets must expose at least three concepts:
|
||||
|
||||
- The original input path, for diagnostics.
|
||||
- An opaque `targetKey`, used for stale guards and file-state lookup. The local backend might use a realpath-like key; a remote backend might use a workspace URI or file id. Consumers must not parse or assume this is a local absolute path.
|
||||
- A `displayPath`, used for model/UI-facing output. It may be a local absolute path, workspace-relative path, or remote URI depending on the backend.
|
||||
|
||||
Read and mutation results must include an opaque file `version`. A local backend can use mtime/size or a hash-like token; a remote backend can use a revision id. `ctx.fs` records versions in its file-state store for stale checks; consumers may display related metadata but must not interpret the version token.
|
||||
|
||||
The provider hands back decoded text: `readText` returns a whole regular text file, `streamText` streams the same text semantics for large files. Both own regular-file checks, bounded line/output handling is NOT theirs — line windowing, numbered-line rendering, and total-line accounting live in the executor (`dsh-tool-fs`), which reads through `ctx.fs` and renders the model-facing window. The provider owns UTF-8 decoding and binary/NUL rejection; it does not know about line windows or views.
|
||||
|
||||
Observed-state recording is not on `ctx.fs`: after a successful read the executor emits `fs/observed`, and the `dsh-fs-policy` plugin records `{ version }` for the deriving owner. There is no `full`/`partial` view — a read at any window records the version, and freshness (not view completeness) authorizes a later write/edit.
|
||||
|
||||
Full-file writes create or replace UTF-8 text files. Backends may create parent directories when that behavior is supported and documented. Existing non-regular targets are rejected. `writeText` takes an optional expectation: `createIfAbsent` creates a missing target and rejects an existing one with `FS_NOT_OBSERVED` (the path the policy uses for an unobserved owner); `replaceIfVersion` replaces only when the target exists at the observed version, else `FS_STALE_VERSION`; omitting the expectation is the unconditional bare-provider create-or-overwrite. The policy plugin chooses which expectation to supply from the owner's observed state.
|
||||
|
||||
Literal edit is a provider primitive (`editText`), not composed in `tool-fs` from a read plus write. Literal matching, duplicate-match rejection, CRLF preservation, binary rejection, optional stale-version checking, and atomic read-modify-write must stay together inside the backend's mutation critical section. `editText` takes the same optional version expectation; the stale check runs before literal matching so an edit against an old read reports `FS_STALE_VERSION`. A remote backend may implement edit as a native compare-and-edit operation; the consumer should not force local-style composition.
|
||||
|
||||
The policy plugin, not `ctx.fs`, gates on prior observation: an `edit` requires a prior observation by the owner (else `FS_NOT_OBSERVED`), and the recorded version is passed to `editText` as the CAS basis. With the policy plugin absent, `ctx.fs` alone is a complete unconstrained seam (unconditional write/edit); the tool is never method-coupled to the policy.
|
||||
|
||||
Filesystem contract failures are thrown as `FsError extends HarnessError`, and the tool registry converts them into `isError` tool results with structured `{ name, code }` metadata. `dsh-fs` owns this vocabulary rather than each tool inventing messages. The codes are `FS_NOT_FOUND`, `FS_NOT_TEXT`, `FS_STALE_VERSION`, `FS_NOT_OBSERVED`, `FS_NOT_REGULAR_FILE`, `FS_AMBIGUOUS_EDIT`, `FS_EDIT_NOT_FOUND`, and `FS_ABORTED`. (An earlier draft included `FS_PARTIAL_OBSERVATION`; freshness-based authorization has no partial/full distinction, so it was dropped.)
|
||||
|
||||
## Tool consumer behavior
|
||||
|
||||
`@deepseek-ai/dsh-tool-fs` is the model-facing consumer. It owns tool names, JSON schemas, argument validation at the model boundary, prompt sections, and result formatting. It does not own filesystem execution.
|
||||
|
||||
The first tool suite contains:
|
||||
|
||||
- `read`: inspect a UTF-8 text file and return line-numbered content with pagination guidance.
|
||||
- `write`: create or fully replace a UTF-8 text file.
|
||||
- `edit`: update an existing UTF-8 text file by replacing literal text, requiring a unique match by default and allowing an explicit replace-all mode.
|
||||
|
||||
Each tool follows the same execution shape:
|
||||
|
||||
1. Validate and normalize model arguments.
|
||||
2. Call the appropriate `ctx.fs` operation.
|
||||
3. Format the result as `ContentBlock[]` for the model.
|
||||
4. Let thrown backend/tool errors flow through `ToolRegistry.execute()`, which converts them into `isError` tool results.
|
||||
|
||||
The package registers prompt guidance through `ctx.systemPrompt.section(...)` and registers schemas through `ctx.tools.register(...)`. Tool schemas still flow into the normal prompt assembly path via `SystemPrompt.assemble()` and `ToolRegistry.schemas()`; no agent-loop changes are required.
|
||||
|
||||
The tool package must keep model-facing contracts stable when backends change. A local backend and a remote backend may resolve paths differently internally, but the `read` / `write` / `edit` schemas should not change solely because the backend changes.
|
||||
|
||||
The default deployment requires a prior `read` before updating an existing file with `write` or `edit`. `tool-fs` does not implement this by checking whether a tool named `read` ran: it dispatches the `fs/write-intent`/`fs/edit-intent` events (passing the execution context as the opaque actor), and the `dsh-fs-policy` plugin derives the owner, gates on prior observation, and supplies the version expectation. Any windowed read authorizes a later write/edit as long as the file is unchanged. Creating a new file with `write` does not require prior observation.
|
||||
|
||||
The root plugin registers the full suite by composing the per-tool registration helpers. It injects `fs`, `tools`, and `systemPrompt`.
|
||||
|
||||
## Migration plan
|
||||
|
||||
This RFC starts from `origin/master`, where no filesystem tool package exists yet. The landed implementation adds the new three-package topology directly:
|
||||
|
||||
1. Add `packages/fs/fs` with the `ctx.fs` abstract service and vocabulary types.
|
||||
2. Add `packages/fs/fs-local` with the local backend implementation and backend-level tests.
|
||||
3. Add `packages/fs/tool-fs` with the model-facing `read`, `write`, and `edit` tools over `ctx.fs`.
|
||||
4. Update `docs/architecture.md`, `packages/README.md`, package READMEs, build/typecheck config, and aggregate maintenance scripts such as `scripts/publint-all.ts`.
|
||||
|
||||
This RFC's first landing kept the observed-state store behind `ctx.fs`. The split-fs-seam and event-gate RFCs then moved it into the standalone `@deepseek-ai/dsh-fs-policy` plugin on the `fs/*` event gate, which is the shipped shape; a deployment loading `dsh-tool-fs` also loads `dsh-fs-policy` to get read-before-write/edit.
|
||||
|
||||
Example leaf configs stay bash-only in this landing. Wiring `examples/coding-agent` or `examples/acp-agent` to `dsh-fs-local` + `dsh-tool-fs` changes the model prompt, visible tool schemas, and ACP snapshot transcript, so it should land as a follow-up UX/example change with prompt and snapshot updates in the same PR.
|
||||
|
||||
If this work is split into multiple PRs, they should follow the seam order:
|
||||
|
||||
1. Interface PR: `dsh-fs` only, with service registration and contract tests.
|
||||
2. Implementation PR: `dsh-fs-local`, with real filesystem behavior tests.
|
||||
3. Consumer PR: `dsh-tool-fs`, docs, and integration tests; example wiring follows in a separate prompt/snapshot PR.
|
||||
|
||||
The earlier combined package name `@deepseek-ai/dsh-fs-tools` should not become part of the new public surface.
|
||||
|
||||
## Tests
|
||||
|
||||
Tests should follow the package boundary, not only the user-visible tools.
|
||||
|
||||
`dsh-fs` tests cover the service seam itself: a provider registers `ctx.fs`, duplicate providers follow Cordis service behavior, disposal removes the service, and any shared contract helpers or type-level utilities behave as documented.
|
||||
|
||||
`dsh-fs-local` tests cover real filesystem behavior through the `ctx.fs` interface, not through model tools. They should include path resolution, absolute paths, `..` segments, symlinks inside and outside the configured base directory, reading small and large text files, streaming, binary-file rejection, invalid-UTF-8 rejection, abort handling, unconditional and version-guarded full-file writes, `createIfAbsent`/`replaceIfVersion` semantics, parent-directory creation, non-regular target rejection, literal edit success/failure, unique-match enforcement, replace-all behavior, line-ending preservation, stale-version rejection (guarded edit against an old version), and structured `FsError` codes. The observed-state/owner-derivation policy is NOT here — it lives in `dsh-fs-policy` and is tested there.
|
||||
|
||||
Beyond the happy/sad paths above, `dsh-fs-local` tests must cover the defensive-pattern classes this repo has been bitten by:
|
||||
|
||||
- **Atomic-write temp-file safety**, not just cleanup. The atomic replace must write its temp file into a private (`0700`) directory, with a random name and an exclusive owner-only (`'wx'`, `0o600`) open, mirroring the bash spill-file rules — predictable world-readable temp paths invite symlink races and disclosure. Assert the temp file's permissions and that a pre-existing temp path does not get clobbered, alongside the existing cleanup-on-failure path.
|
||||
- **Implementation requirement:** `dsh-fs-local` write/edit use the same private-temp primitive: a random `0700` staging directory next to the target, an exclusive `0o600` temp file, cleanup on failure, and a final atomic rename. Do not move this RFC to `implemented/` if that primitive regresses or is deliberately revised.
|
||||
- **`targetKey` identity through symlinks.** Two different input paths that resolve to the same realpath must share one file-state entry: a `read` via path A must satisfy the read-before-edit guard for an `edit` via symlink path B, and a stale write through one path must be detected through the other. This is the contract that makes the stale guard correct, so test it directly.
|
||||
- **Concurrency / stale races.** The RFC names edit as race-prone (see Risks). Test that two concurrent write/edit operations against the same target settle deterministically: one succeeds and the other is rejected with `FS_STALE_VERSION` rather than silently overwriting, and that a successful edit refreshes recorded state so an immediately-following edit by the same owner proceeds.
|
||||
- **HMR safety and disposal.** `dsh-fs-local` registers `ctx.fs` and owns the in-memory file-state store, so it needs its own HMR-safety test (register the backend on a fiber, dispose it, assert the `ctx.fs` provider is withdrawn and the file-state store is released — a later provider starts with no inherited state).
|
||||
|
||||
`dsh-tool-fs` tests cover the consumer surface against the real `dsh-fs-local` provider (mock only the model/clock, not the collaborator). They should verify tool schemas, argument validation, prompt-section registration, formatting of successful results, propagation of backend `FsError` codes into `isError` tool results through `ctx.tools.execute()`, that read/write/edit dispatch the `fs/*` events (passing the execution context as the actor), root-plugin suite registration, and HMR cleanup of both tool schemas and prompt sections.
|
||||
|
||||
Integration tests should load `dsh-fs-local` plus `dsh-tool-fs` (and, for the default deployment, `dsh-fs-policy`) and execute `read`, `write`, and `edit` through `ctx.tools.execute()` to prove the packages work together without bypassing the tool registry — including a bare-provider path (no `dsh-fs-policy`) where an unread edit/overwrite succeeds. They must verify the world, not the tool's self-report: after a `write`/`edit`, read the file back from disk and assert byte-identical content (and that untouched files are unchanged), rather than trusting the returned `ContentBlock[]`. Each integration/e2e test owns its resources — create the harness in the test, run against a per-test temporary directory, and dispose the harness and remove the directory in `afterEach` even on failure or timeout.
|
||||
|
||||
Repo gates for the implementation include the focused vitest suites, `pnpm run typecheck`, `pnpm run test:coverage` for runtime code, and build/publint coverage after adding package entrypoints.
|
||||
|
||||
## Risks
|
||||
|
||||
**`cwd` can be mistaken for a sandbox.** The local backend's base directory is a resolution default, not automatically a containment boundary. If containment is required, it must be enforced by the backend contract or by a permission/sandbox plugin on `tools/execute`.
|
||||
|
||||
**The interface can become too local.** Returning fields such as `absolutePath` from `ctx.fs` would make remote, sandboxed, or virtual backends awkward. The contract should expose display metadata without requiring consumers to understand host paths.
|
||||
|
||||
**The interface can become too thin.** If `ctx.fs` only mirrors `node:fs` primitives, `tool-fs` will reimplement binary detection, pagination, atomic writes, and edit semantics. That recreates the coupling this RFC is trying to avoid.
|
||||
|
||||
**Edit semantics are race-prone.** Literal edit is a read-modify-write operation. Without a stale-content guard or backend-level atomic edit primitive, concurrent edits can overwrite each other. The first implementation should document its guarantees clearly; stronger compare-and-swap semantics can be added later if needed.
|
||||
|
||||
**Observed state does not belong on `ctx.fs`.** Recording what an execution context has seen is workflow policy, not raw filesystem I/O. This RFC first placed it inside the filesystem seam; the split-fs-seam RFC then established that a sandboxed/remote backend should not inherit model-facing observation policy, and moved it into the `dsh-fs-policy` plugin. The provider seam keeps only what write/edit safety genuinely needs at the storage layer — a backend-minted version token and an optional version-guarded mutation — while the policy plugin owns owner derivation, observed-state, and read-before-edit gating over the `fs/*` events.
|
||||
|
||||
**The `resolve`-then-operate shape costs an extra round-trip per call.** Each tool may resolve a path to an `FsTarget` and then issue the read/write/edit as a separate `ctx.fs` call. For the local backend this is negligible (resolution is in-memory path normalization), but a remote/sandboxed backend may turn each step into its own request, so a single `read` can become two network round-trips. Backends where the round-trip matters can cache or fold resolution internally while preserving the observable contract.
|
||||
|
||||
**File-state persistence is deferred.** The first implementation can keep file state in memory. Resumed sessions should conservatively require files to be read again before write/edit tools accept updates until a future session-event or persistence mechanism makes file state replayable.
|
||||
|
||||
**Error codes become part of the seam.** `FsError` codes make stale-version and observation failures machine-routable through the existing structured error taxonomy. The cost is that `dsh-fs` imports the shared `HarnessError` base from `dsh-llm`; that dependency is intentional and should stay limited to the error vocabulary.
|
||||
|
||||
**Package churn is front-loaded.** The three-package split adds boilerplate before there is more than one backend. This is intentional: filesystem access is a likely sandbox/remote boundary, and changing the package surface after shipping model-facing tools would be more expensive.
|
||||
@@ -0,0 +1,175 @@
|
||||
# RFC: Make `dsh-fs-policy` an event-gate plugin, not a method interface
|
||||
|
||||
Status: implemented
|
||||
|
||||
## Problem
|
||||
|
||||
[The split-fs-seam RFC](../simplification/2026-06-26-fsspec-style-fs-seam.md) put `ctx.fileContext` between the model-facing tools and the `ctx.fs` provider: `dsh-tool-fs` injects `fileContext` and routes every `read`/`write`/`edit` through its methods. That makes `fileContext` **in-path and mandatory**. The tool cannot reach `ctx.fs` without it, the policy layer owns the fs I/O and the read windowing, and a deployment that does not want observed-state policy cannot simply drop the package — `dsh-tool-fs` would fail to resolve `ctx.fileContext`.
|
||||
|
||||
This couples three things that should be separable:
|
||||
|
||||
1. **What the tool does** — resolve a path, read a window, write/edit a file. This is the tool's job and needs only `ctx.fs`.
|
||||
2. **The freshness/observation policy** — "edit requires a prior read", "write/edit must be based on the version you read". This is the `dsh-fs-policy` plugin's job.
|
||||
3. **The recording of observed state** — a side effect that should never block the tool from functioning.
|
||||
|
||||
Because the tool calls `fileContext` methods, removing the policy layer is a breaking change rather than a graceful loss of an *add-on*. The policy is load-bearing for the tool to even run, not an opt-in tightening.
|
||||
|
||||
## Decision
|
||||
|
||||
Invert the control flow. **`dsh-tool-fs` becomes the executor and calls `ctx.fs` directly**; **`dsh-fs-policy` becomes a gate + recorder plugin** that participates through events, never through a method the tool calls and never by registering a `ctx.fileContext` service.
|
||||
|
||||
```text
|
||||
tool dsh-tool-fs executor: resolves, reads windows, writes/edits via ctx.fs;
|
||||
emits fs policy events; renders results
|
||||
policy dsh-fs-policy plugin: listens to fs/write-intent +
|
||||
fs/edit-intent (single-slot waterfall) and fs/observed
|
||||
(emit) events; adds observed-state + freshness.
|
||||
provider seam dsh-fs ctx.fs: text IO + ATOMIC mutation primitives whose version
|
||||
guard is OPTIONAL; owns the fs policy event vocabulary
|
||||
provider dsh-fs-local local implementation of ctx.fs
|
||||
```
|
||||
|
||||
The model is **additive, not subtractive**: `ctx.fs` on its own is a complete, unconstrained text-storage seam — `read` reads, `write` unconditionally creates-or-overwrites, `edit` unconditionally replaces literal text in the current content. There is no "先读后写", no version check, nothing to remove; the bare provider just does the I/O atomically. `dsh-fs-policy` is a plugin that *adds* constraints on top: observed-state, read-before-edit, and "write/edit must be based on the version you read". So removing `dsh-fs-policy` does not break `dsh-tool-fs` at the service-injection boundary; it removes the policy gate and leaves the bare provider behavior. The intended deployment stance is that a config loading the fs tools also loads `dsh-fs-policy`, so the user-facing behavior and prompt discipline are read-before-write/edit (the `coding-agent` and `acp-agent` demos wire the full stack). The bare-provider mode exists because the tool should not be method-coupled to the policy plugin, not because an unconstrained filesystem is the normal product stance.
|
||||
|
||||
`dsh-tool-fs` no longer injects `fileContext`. It injects `fs` and `tools`/`systemPrompt`.
|
||||
|
||||
## The policy is enforced by provider CAS, not by `dsh-fs-policy` stat
|
||||
|
||||
`dsh-fs-policy` enforces "you must write/edit based on the version you read" **without ever calling `stat` or comparing versions itself**. It supplies the observed version as the CAS basis and lets the provider's mutation critical section detect staleness:
|
||||
|
||||
- "Have you read this file?" is the one thing `dsh-fs-policy` decides locally — a `WeakMap` lookup, no I/O. No record ⇒ `FS_NOT_OBSERVED`.
|
||||
- "Is the version you read still current?" is decided **inside `ctx.fs.editText`/`writeText`**, in the same atomic lock that performs the read-match-rename. `dsh-fs-policy` passes `vObserved` as the expectation; the provider raises `FS_STALE_VERSION` if the file has moved on.
|
||||
|
||||
This is deliberate. If `dsh-fs-policy` stat-ed and compared versions in its waterfall handler, there would be a TOCTOU gap between that check and the tool's actual write — the file could change in between, so the check would be a false guarantee that the provider's lock has to back up anyway. Putting the version check in the provider's critical section is both race-free and zero extra `stat`. So `dsh-fs-policy` does **no** filesystem I/O; the "must be based on the latest read" guarantee is *realized* by CAS, and `dsh-fs-policy` only chooses the basis (`vObserved`) and gates on prior observation.
|
||||
|
||||
## Provider contract change: the version guard is optional
|
||||
|
||||
For the bare provider to be unconstrained, the version guard on its two mutations becomes **optional** — present ⇒ guarded, absent ⇒ unconditional:
|
||||
|
||||
```ts ignore-check
|
||||
// writeText: expected is now optional. The FsWriteIntent union is UNCHANGED.
|
||||
writeText(target: FsTarget, content: string, expected?: FsWriteIntent, signal?: AbortSignal): Promise<FsWriteOutcome>
|
||||
// undefined → unconditionally create-or-overwrite (bare default)
|
||||
// createIfAbsent → create only, reject an existing file (dsh-fs-policy, unobserved) [unchanged]
|
||||
// replaceIfVersion → overwrite only at the observed version, else FS_STALE_VERSION [unchanged]
|
||||
|
||||
// editText: expected becomes optional (was the required { version: FsVersion }).
|
||||
editText(target: FsTarget, edit: FsEditRequest, expected?: { version: FsVersion }, signal?: AbortSignal): Promise<FsEditOutcome>
|
||||
// undefined → unconditionally replace literal text in the current content (bare default);
|
||||
// a missing target still reports FS_STALE_VERSION
|
||||
// { version } → edit only at that version, else FS_STALE_VERSION (the current behavior)
|
||||
```
|
||||
|
||||
The `FsWriteIntent` union itself does not change — the third "unconditional" state is expressed by *omitting* `expected`, so both mutations share one symmetric shape (`expected?`: omit = no guard, present = guarded). This keeps full backward compatibility for the guarded paths `dsh-fs-policy` uses; only the previously-impossible "no guard" case is new, and it is the bare-provider default. The mutation still runs inside the backend's per-target lock either way, so an unconditional write/edit is still atomic (no torn files); "unconditional" drops the *version* precondition, not the atomicity. `editText` reports a missing target as `FS_STALE_VERSION` on both guarded and unguarded paths, preserving one edit failure code for "the target cannot be edited at this moment".
|
||||
|
||||
## Event vocabulary (owned by `dsh-fs`)
|
||||
|
||||
The events live in `@deepseek-ai/dsh-fs`, not in `dsh-fs-policy`. This is forced by the decoupling contract: `dsh-tool-fs` is the emitter, so it must reference the event types, and it must keep compiling even though `dsh-fs-policy` no longer provides a method service. `dsh-fs` is the package both `dsh-tool-fs` and `dsh-fs-policy` already depend on, so it is the only home that lets the emitter and the policy listener share a vocabulary without the emitter depending on the policy plugin.
|
||||
|
||||
These events carry existing `dsh-fs` vocabulary (`FsTarget`, `FsVersion`, `FsWriteIntent`) plus an opaque actor — not model-facing concepts (no line windows, numbered lines, or rendered footers leak down).
|
||||
|
||||
**The two `fs/*` decision events are single-slot decision points, NOT a composable interception chain.** A waterfall listener that does not call `next()` short-circuits the rest of the chain (verified in [vendor/cordis/src/events.ts](../../../../vendor/cordis/src/events.ts) — `waterfall` runs listeners around the final `next` thunk, and a listener that returns without calling `next()` reaches neither later listeners nor the tool's default thunk). `dsh-fs-policy` fully decides the write/edit expectation and does not call `next()`, so it occupies that one decision slot in the default deployment. This is deliberate: "what version basis does this mutation guard against" is a single decision, not an accumulation. The names (`fs/write-intent`, `fs/edit-intent`) say "produce the value", not "authorize", so they do not imply a stackable authorization chain. Genuinely composable interception (permission, audit, sandbox) belongs on the existing `tools/execute` waterfall, which every tool call already flows through — not on this fs version-decision slot.
|
||||
|
||||
**The occupant is decided by registration order — first-registered (or `prepend`ed) wins.** cordis dispatches waterfall listeners in registration order (`push`, or `unshift` for `prepend` — [vendor/cordis/src/events.ts](../../../../vendor/cordis/src/events.ts)), and the first non-`next()` decider short-circuits the rest. So the slot is **first-wins**, and `dsh-fs-policy` owning it rests on the default deployment convention: it is the decider registered for these events. The event shape does NOT itself guarantee "an unread edit is rejected" — a plugin that registers a looser `fs/edit-intent` decider BEFORE `dsh-fs-policy` (or with `prepend`) would decide first and bypass the `FS_NOT_OBSERVED` gate. That is the inherent property of a first-wins single slot, stated here so it is not mistaken for an enforced invariant. This RFC does not add a multi-policy composition mechanism; the implementation requirement is that `dsh-tool-fs` dispatches these waterfalls on every write/edit path and that a config wiring the fs tools loads `dsh-fs-policy` as the policy decider.
|
||||
|
||||
The actor is typed `object` in `dsh-fs` — a pure opaque carrier the provider seam never reads or narrows. The owner-derivation (`actor.agent?.session`) and the `{ agent?: { session? } }` structural shape stay entirely inside `dsh-fs-policy`, which narrows the `object` actor to that shape in its listeners. `dsh-fs` owns the event names and the fs vocabulary; it does NOT own the policy layer's runtime owner structure.
|
||||
|
||||
```ts
|
||||
import type { FsTarget, FsVersion, FsWriteIntent } from '@deepseek-ai/dsh-fs'
|
||||
|
||||
interface Events {
|
||||
/**
|
||||
* Single-slot decision: produce the write expectation for the next
|
||||
* ctx.fs.writeText. The default returns undefined (unconditional create-or-
|
||||
* overwrite — the bare provider). The policy listener returns createIfAbsent
|
||||
* (unobserved) or { kind: 'replaceIfVersion', version: vObserved } (observed).
|
||||
* The listener does NOT call next(): one decision, not a composable chain. @mode waterfall
|
||||
*/
|
||||
'fs/write-intent'(target: FsTarget, actor: object | undefined, next: () => FsWriteIntent | undefined | Promise<FsWriteIntent | undefined>): Promise<FsWriteIntent | undefined>
|
||||
/**
|
||||
* Single-slot decision: produce the optional version guard for the next
|
||||
* ctx.fs.editText. The default returns undefined (unconditional edit of the
|
||||
* current content — the bare provider; no stat). The policy listener returns
|
||||
* { version: vObserved }, or throws FS_NOT_OBSERVED if the actor is unset or
|
||||
* has not observed the target. Does NOT call next(): one decision. @mode waterfall
|
||||
*/
|
||||
'fs/edit-intent'(target: FsTarget, actor: object | undefined, next: () => { version: FsVersion } | undefined | Promise<{ version: FsVersion } | undefined>): Promise<{ version: FsVersion } | undefined>
|
||||
/**
|
||||
* Record that an actor observed a target at a version, after a successful
|
||||
* read/write/edit. Fire-and-forget (plain emit). Listeners MUST be
|
||||
* synchronous, side-effect-only recorders (`dsh-fs-policy`'s is a WeakMap
|
||||
* write); the tool does not guard the emit, so a throwing listener surfaces as
|
||||
* the tool's isError result. No listener ⇒ nothing recorded.
|
||||
* @mode emit
|
||||
*/
|
||||
'fs/observed'(target: FsTarget, version: FsVersion, actor: object | undefined): void
|
||||
}
|
||||
```
|
||||
|
||||
The `fs/*` decision events are **unbound waterfalls dispatched by the tool** (like `agent/request`, which the loop dispatches with no `this`), not service-bound waterfalls (like `llm/stream`). The dispatcher is the `dsh-tool-fs` plugin, which is not a service.
|
||||
|
||||
## Tool contract (`dsh-tool-fs`)
|
||||
|
||||
The tool keeps its model-facing schemas (`read`/`write`/`edit`, byte-for-byte unchanged) and prompt sections. The prompt guidance stays policy-first because a deployment loading the fs tools is expected to also load `dsh-fs-policy`: the model is still told to read before overwriting or editing, and any wording that says the "backend" requires that should be corrected to say the fs-policy plugin requires it. The bare-provider fallback does not change the prompt stance.
|
||||
|
||||
`dsh-tool-fs` gains the executor responsibilities relocated from the old `fileContext` method service, including **read rendering** (`read-render.ts`: `buildWindow` + `formatReadOutput`, `READ_MAX_BYTES`, `READ_MAX_LINE_LENGTH`, `FileReadOutcome`/`FileTextLine`, plus `STREAM_MIN_SIZE` in `read.ts`), which is the tool's rendering detail now that the tool owns the read. Those read-rendering types and helpers move into `dsh-tool-fs`; the policy plugin must not remain a type dependency for the tool.
|
||||
|
||||
`dsh-tool-fs` is a single root plugin that registers all three tools (`read`/`write`/`edit`), mirroring `dsh-tool-bash`. It injects `fs` (plus `tools`/`systemPrompt`), never `fileContext`. (The original proposal also exposed each tool as a `/read`/`/write`/`/edit` subpath plugin for focused deployments; that was dropped on implementation — no consumer needed a single-tool deployment, and the subpath publishing forced bespoke `tsdown`/`tsconfig`/`files`/workspace-constraint handling no sibling tool package carries. The per-tool registration helpers (`applyReadTool`/`applyWriteTool`/`applyEditTool`) remain internal modules the root plugin composes.)
|
||||
|
||||
`stat` budget is minimized by letting the waterfall produce the expectation lazily — the bare default returns `undefined` (no guard) and never stats:
|
||||
|
||||
- **read** — one `stat` (type + size routing + version), then `readText`/`streamText`, then `buildWindow`, then an `emit('fs/observed', target, info.version, exec)`. The post-read confirming `stat` from the old `fileContext.read` is dropped; a writer racing between the routing stat and the read can at worst make a *later* guarded edit spuriously `FS_STALE_VERSION` (fail-closed: the model re-reads, never writes against the wrong version, since `editText` re-checks in its lock).
|
||||
- **write** — `expectation = await ctx.waterfall('fs/write-intent', target, exec, () => undefined)`, then `ctx.fs.writeText(target, content, expectation)`, then an `emit('fs/observed', target, outcome.version, exec)`. **Zero stat in the tool** with or without `dsh-fs-policy`.
|
||||
- **edit** — `expectation = await ctx.waterfall('fs/edit-intent', target, exec, () => undefined)`, then `ctx.fs.editText(target, edit, expectation)`, then an `emit('fs/observed', target, outcome.version, exec)`. **Zero stat in the tool** in both cases: the bare default is `undefined` (unconditional edit), so the tool never stats to manufacture a basis. If the target is absent, the provider reports `FS_STALE_VERSION` even on the unguarded path.
|
||||
|
||||
The tool passes `exec` (the tool-execution context) as the `actor` argument on every dispatch, so `dsh-fs-policy` can derive its observed-state owner. The tool does not know whether the policy plugin is present: it always provides the bare default behavior in the `next` thunk, and `dsh-fs-policy` short-circuits the thunk before it runs in the default deployment.
|
||||
|
||||
**`fs/observed` fires AFTER the mutation already succeeded**, via a plain `ctx.emit`. The event contract is intentionally narrow: an `fs/observed` listener MUST be synchronous and side-effect-only — `dsh-fs-policy`'s listener is a `WeakMap.set`, which cannot throw under normal operation and returns no promise. The tool does not guard the emit, so a listener that violates the contract by throwing would surface as the tool's `isError` result ([tools/index.ts](../../../../packages/core/tools/src/index.ts) — `ToolRegistry.execute` catches a tool throw into an error result) — reporting failure for a write/edit that actually happened. That is the price of keeping the event a plain fire-and-forget recorder: cordis `emit` does not await listener promises, so async or fallible audit/telemetry/listener work does not belong on this event. If layered or async observation is ever wanted, that is a new event with its own dispatch story.
|
||||
|
||||
## Policy plugin contract (`dsh-fs-policy`)
|
||||
|
||||
`dsh-fs-policy` is a plugin, not a service. It does not register `ctx.fileContext`, has no public method surface, and exposes no `read`/`write`/`edit`/`resolve` methods. It attaches three listeners via `ctx.on()` registrations (each returning a disposer for HMR). It keeps the observed-state `WeakMap<owner, Map<targetKey, { version }>>` and the structural owner derivation (narrowing the event's opaque `object` actor to its own `{ agent?: { session? } }` shape), but does not inject `fs` — every handler operates only on its own `WeakMap`, never on `ctx.fs`.
|
||||
|
||||
- `fs/write-intent` listener: `prior = getObserved(owner, key)`; return `prior ? { kind: 'replaceIfVersion', version: prior.version } : { kind: 'createIfAbsent' }`. It does NOT call `next()`: it fully owns the single decision slot.
|
||||
- `fs/edit-intent` listener: `prior = getObserved(owner, key)`; if no `owner` or no `prior`, throw `FS_NOT_OBSERVED`; else return `{ version: prior.version }`. Also does not call `next()`.
|
||||
- `fs/observed` listener: `record(owner, key, version)`.
|
||||
|
||||
An observed-state entry is the **prior-observation record**: a successful `read`, `write`, OR `edit` all emit `fs/observed` and record `{ version }`, so the entry's presence means "this owner has observed this target at this version", not narrowly "has read it". This is what lets a create-then-edit or edit-then-edit sequence work without an intervening re-read: the mutation refreshes the recorded version to its own result, so the next edit's basis is the version it just produced. `FS_NOT_OBSERVED` rejects only an edit with NO prior observation of any kind. The owner is derived structurally from `{ agent?: { session? } }`; disposal drops all state (HMR safety).
|
||||
|
||||
`dsh-fs-policy` is now a pure policy/recording plugin with no service surface — it influences the world only through the event seam. That is what removes the method coupling from `dsh-tool-fs`.
|
||||
|
||||
## Bare-provider behavior (no `dsh-fs-policy`)
|
||||
|
||||
This is not the intended deployment stance — a config loading the fs tools is expected to also load `dsh-fs-policy`. It is the unconstrained provider floor that exists once the tool is no longer coupled to a policy method service. With `dsh-fs-policy` absent, every `fs/*` waterfall falls through to its `undefined` default and `fs/observed` has no listener:
|
||||
|
||||
- **read** is identical (it never needed policy; it only emits a now-unheard `fs/observed`).
|
||||
- **write** unconditionally creates-or-overwrites: `expected` is `undefined`, so `writeText` writes whether or not the file exists and whatever its current version. No read-first requirement, no version check.
|
||||
- **edit** unconditionally replaces literal text in the file's current content: `expected` is `undefined`, so `editText` matches and rewrites without a version guard or a read-first requirement (`FS_EDIT_NOT_FOUND`/`FS_AMBIGUOUS_EDIT` still apply — those are about the literal match, not freshness). A missing target still reports `FS_STALE_VERSION`, matching the guarded edit path's "cannot edit this target now" code.
|
||||
|
||||
Both mutations are still atomic (the backend's per-target lock is unconditional). What is simply *absent*, not lost, is the policy `dsh-fs-policy` would add: observed-state, read-before-edit, and version-guarded write/edit. Loading `dsh-fs-policy` layers those constraints on by having its listeners return guarded `expected` values instead of `undefined`; nothing in the bare provider changes.
|
||||
|
||||
## Supersedes
|
||||
|
||||
This amends — does not reverse — [the split-fs-seam RFC](../simplification/2026-06-26-fsspec-style-fs-seam.md). The four-layer split, the provider contract, and the freshness *policy* are all kept. What changes is the **coupling between the tool and the policy layer**: a mandatory method service became a plugin-owned event gate, and the fs I/O + read windowing moved from `fileContext` up into `dsh-tool-fs`. The split-fs-seam RFC's description of `dsh-tool-fs` injecting `fileContext` and of `fileContext` owning `read`/`write`/`edit` was updated to match in the same change.
|
||||
|
||||
## Acceptance Criteria
|
||||
|
||||
- The `dsh-tool-fs` root plugin injects `fs` (+ `tools`/`systemPrompt`), not `fileContext`; it calls `ctx.fs` directly and dispatches the `fs/write-intent`/`fs/edit-intent` waterfalls (passing `exec` as the actor) and the `fs/observed` emit. Read rendering lives in `dsh-tool-fs`. (No subpath plugins — see the Tool contract above.)
|
||||
- `dsh-fs` declares the three events with `@mode` tags and an opaque `object` actor argument (no agent/session structure leaks into the provider vocabulary); the generated cordis catalog is regenerated.
|
||||
- `dsh-fs-policy` is a plugin, not a service: it does not register `ctx.fileContext`, has no public `read`/`write`/`edit`/`resolve` methods, and does not inject `fs`; it registers the three listeners, keeps observed-state, and has HMR/disposal coverage (dispose the fiber, assert the gate no longer rewrites).
|
||||
- **Bare-provider test**: a config WITHOUT `dsh-fs-policy` boots the `dsh-tool-fs` root plugin, and `read`/`write`(create AND overwrite)/`edit` work against the real `dsh-fs-local`; an `edit` of an unread existing file and an overwrite of an existing unread file both succeed (unconditional bare-provider behavior), proving the tool carries no `fileContext` dependency. A bare-provider edit of a missing target reports `FS_STALE_VERSION`. With `dsh-fs-policy` present, the same unread `edit` is rejected `FS_NOT_OBSERVED` and the same unread overwrite uses `createIfAbsent` (rejected on an existing file).
|
||||
- **Single-slot semantics**: a test registers a second `fs/edit-intent` listener AFTER `dsh-fs-policy` and asserts it is NOT reached (first-wins short-circuit), and documents in a comment that a decider registered before/`prepend`ed would instead win — the slot is first-wins by convention, not an enforced invariant.
|
||||
- **Fire-and-forget recording**: `fs/observed` is emitted via a plain `ctx.emit` after the mutation succeeds; a listener is contractually synchronous and side-effect-only, so the tool does not guard it.
|
||||
- `dsh-fs` `writeText`/`editText` make `expected` optional (omit ⇒ unconditional); the `FsWriteIntent` union is unchanged, and `dsh-fs-policy`'s guarded paths (`createIfAbsent`/`replaceIfVersion`/`{ version }`) behave exactly as today. A bare-provider test exercises an unconditional overwrite, an unconditional edit, and a missing-target edit reporting `FS_STALE_VERSION`.
|
||||
- Freshness is enforced by provider CAS when guarded: an edit after a stale read reports `FS_STALE_VERSION` (regression test); `dsh-fs-policy` performs no `stat`.
|
||||
- `stat` budget: read = 1, write = 0, edit = 0 — in the tool, with or without `dsh-fs-policy` (the bare default returns `undefined`, never stats). A test asserts neither write nor edit stats in the tool on either path.
|
||||
- Model-facing schemas stay byte-for-byte unchanged; snapshot transcript goldens are unaffected (or the diff is reviewed and re-recorded with justification).
|
||||
- Docs/artifacts updated in the same change: `docs/architecture.md`, fs package READMEs, `docs/core-data-structures/filesystem.md`, the split-fs-seam RFC's now-amended description, type-equiv blocks + manifest, cordis catalog, module graph. Gates green: `doc-sync`, `knip`, `test:coverage` (100% per-file).
|
||||
|
||||
## Risks
|
||||
|
||||
- **Event indirection over a method call.** A waterfall + emit is less direct than `await ctx.fileContext.edit(...)`. The payoff is removing the tool-to-policy method dependency while keeping the default policy plugin; the cost is one more event vocabulary to learn. Mitigated by keeping the three events narrow and documenting the default-thunk semantics on each.
|
||||
- **Policy events in the storage seam.** `dsh-fs` gains two version-decision events plus a recording event though it is "just storage". This is the price of decoupling (the emitter cannot depend on the policy plugin). The events carry only `dsh-fs` vocabulary plus an opaque `object` actor and no model-facing concepts, so the seam stays free of line-window/observation policy types and of the agent/session owner structure.
|
||||
- **Single policy occupant, first-wins by convention.** The `fs/write-intent`/`fs/edit-intent` slots hold exactly one decider; the first-registered (or `prepend`ed) listener wins and the rest are short-circuited. `dsh-fs-policy` owning the slot is a deployment convention, not an event-enforced invariant — a second decider registered first would bypass it. This is acceptable because a second fs-version-policy decider is a misconfiguration, not a feature. If a future need for *layered* fs version policy appears, it is a new RFC (a composable value-passing seam), not a silent second listener on these events. Layered permission/audit/sandbox interception already has its home on `tools/execute`.
|
||||
- **Dropping the post-read confirming stat** makes a follow-up *guarded* edit occasionally fail-closed (`FS_STALE_VERSION` → re-read) under a read/write race. This is a UX nicety lost, never a correctness hole; the provider lock still prevents wrong-version writes.
|
||||
- **The bare provider does no read-before-write/edit and no version check.** A deployment without `dsh-fs-policy` lets the model overwrite or edit any existing file unconditionally. This is the deliberate meaning of keeping the tool independent of a policy service: the safety disciplines live in the `dsh-fs-policy` plugin. A deployment that omits it is opting into an unconstrained filesystem on purpose; that is not the intended stance for a config that ships the fs tools.
|
||||
@@ -0,0 +1,30 @@
|
||||
# RFC: Resolve filesystem paths against the caller's session cwd
|
||||
|
||||
Status: implemented
|
||||
|
||||
## Problem
|
||||
|
||||
The ACP bridge gives every session its own workspace: `session/new` records the editor's project directory as `SessionHeader.cwd`, and `dsh-tool-bash` defaults each bash call's `workdir` to the calling agent's `session.header.cwd` (see [the per-session cwd RFC work in `packages/ui/acp`](../../../../packages/ui/acp) and `resolveWorkdir` in `dsh-tool-bash`). So a bash command in session A runs in A's project, and in session B runs in B's — one server process, N workspaces.
|
||||
|
||||
The filesystem tools did NOT honor this. `ctx.fs.resolve(path)` took no caller context, and `dsh-fs-local` resolved every relative path against a single `config.cwd` fixed at plugin load (`process.cwd()`). In the ACP demo that means `write foo.txt` and `bash cat foo.txt` resolve `foo.txt` against **different** directories — the fs tools against the server's launch dir, bash against the session's project dir. The two tools disagree about what "the current directory" is, which is a correctness bug the moment an editor opens any project other than the server's launch dir. It only appeared to work in the snapshot harness because that harness launches the child process in the same temp dir it passes as the session cwd, so the two coincide.
|
||||
|
||||
## Decision
|
||||
|
||||
Thread the caller's session cwd into path resolution, exactly as `dsh-tool-bash` already does for `workdir`. The **caller** (the tool) supplies the cwd; the provider does not read a session or agent.
|
||||
|
||||
- `FileSystem.resolve` widens to `resolve(path: string, opts?: { cwd?: string }): Promise<FsTarget>`. `opts.cwd` is the base a RELATIVE `path` resolves against; an absolute `path` ignores it; omitting `opts.cwd` uses the backend's own default. An options object (not a positional `cwd?`) leaves room for future resolution hints without another signature change.
|
||||
- `dsh-fs-local.resolve` uses `resolveLocalTarget(opts?.cwd ?? this.config.cwd, path)`. `config.cwd` stays the default for a caller that supplies none (non-ACP / no-session use, and the single-session stdio demo where `process.cwd()` IS the workspace).
|
||||
- `dsh-tool-fs`'s `read`/`write`/`edit` derive the session cwd through a shared `sessionCwd(exec)` helper (`exec.agent?.session.header.cwd`, mirroring bash's `resolveWorkdir`) and pass it to `resolve`. A non-agent / headerless caller yields `undefined`, so the backend applies its default.
|
||||
|
||||
## Why the caller supplies the cwd (not the provider)
|
||||
|
||||
The provider seam must not depend on `dsh-agent` / `dsh-session` — it is a text-storage backend that a sandboxed or remote implementation also satisfies, and those have no notion of an "agent session". The tool already receives the `ToolExecution` (`exec`), which carries the agent, so the tool is the right place to project `exec → cwd` and hand the provider a plain string. This is the "explicit > implicit at package seams" convention: the base directory arrives as an explicit argument the provider acts on, not smuggled in by having the provider reach into a session it should not know about. It also matches `dsh-tool-bash` one-to-one, so the two model-facing file surfaces resolve paths identically.
|
||||
|
||||
The default lives in ONE place — the provider's `config.cwd`. `sessionCwd` returns `undefined` rather than `process.cwd()` when there is no session, so the tool never manufactures a base the provider would otherwise choose.
|
||||
|
||||
## Consequences
|
||||
|
||||
- In the ACP demo the fs tools and bash now agree on each session's workspace; an editor can open any project folder and both tool families act on it.
|
||||
- No change to `FsTarget` identity: `targetKey` is still the realpath of the resolved absolute path, so observed-state keying and symlink identity are unaffected — a correct per-session cwd produces the same key bash targets.
|
||||
- Backward compatible: every existing `resolve(path)` call (all in tests) keeps working; the new argument is optional.
|
||||
- The single-session stdio demo is unaffected: it supplies no session cwd (its agent's session has no `cwd`), so resolution falls back to `config.cwd = process.cwd()`, which is the workspace.
|
||||
@@ -0,0 +1,113 @@
|
||||
# RFC: Filesystem tool schemas — model-facing read/write/edit shapes
|
||||
|
||||
Status: implemented
|
||||
|
||||
## Problem
|
||||
|
||||
[The filesystem capability-seam RFC](../architecture/2026-06-17-filesystem-capability-seam.md) defines the filesystem capability seam (`ctx.fs`), the package split (`dsh-fs`, `dsh-fs-local`, `dsh-tool-fs`, plus the `dsh-fs-policy` policy plugin), and the observed-file/stale-version policy for read-before-write/edit checks — which the [split-fs-seam](../simplification/2026-06-26-fsspec-style-fs-seam.md) and [event-gate](../architecture/2026-06-26-file-context-as-event-gate.md) RFCs moved off `ctx.fs` into the `dsh-fs-policy` plugin on the `fs/*` event gate. The remaining decision for the first filesystem tool delivery is the model-facing schema surface: what arguments the model sees for `read`, `write`, and `edit`.
|
||||
|
||||
The schema should be small enough to implement in the first `dsh-tool-fs` pass, but stable enough that future local/remote/sandboxed filesystem backends do not require model-facing churn. It should also avoid importing every option from reference systems. Claude Code and OpenCode expose similar core file tools but differ in naming style and extra flags; this RFC chooses the minimal shared surface for the prototype.
|
||||
|
||||
## Proposal
|
||||
|
||||
`@deepseek-ai/dsh-tool-fs` exposes these three model-facing tools in the first filesystem suite:
|
||||
|
||||
| Tool | Our schema | Claude Code | OpenCode | Notes | Part of prototype |
|
||||
|---|---|---|---|---|---|
|
||||
| `read` | `read(file_path, offset?, limit?)` | `Read(file_path, offset?, limit?, pages?)` | `read(filePath, offset?, limit?)` | Files only; 1-indexed `offset`; no image/PDF/multimodal support in the first pass. | YES |
|
||||
| `write` | `write(file_path, content)` | `Write(file_path, content)` | `write(content, filePath)` | Creates or overwrites UTF-8 text. Under the default fs-policy, updates to existing files require a prior observation; new-file creates do not. | YES |
|
||||
| `edit` | `edit(file_path, old_string, new_string, replace_all?)` | `Edit(file_path, old_string, new_string, replace_all?)` | `edit(filePath, oldString, newString, replaceAll?)` | Literal string replacement; unique match required by default; under the default fs-policy requires a prior observation (any windowed read counts). | YES |
|
||||
|
||||
The schema uses snake_case field names (`file_path`, `old_string`, `new_string`, `replace_all`) to align with Claude Code and with existing DeepSeek Harness tool-schema examples. The consumer package translates these model-facing names into `ctx.fs` calls and `fs/*` event dispatches.
|
||||
|
||||
## Tool schemas
|
||||
|
||||
### `read`
|
||||
|
||||
`read` inspects a UTF-8 text file and returns line-numbered content.
|
||||
|
||||
Arguments:
|
||||
|
||||
- `file_path: string` — required. Path to read, resolved by `ctx.fs`.
|
||||
- `offset?: number` — optional. 1-based first line to return. Defaults to the first line.
|
||||
- `limit?: number` — optional. Maximum number of lines to return. Defaults and caps are implementation details of `dsh-tool-fs` / `ctx.fs`.
|
||||
|
||||
Non-goals for the first pass:
|
||||
|
||||
- No PDF `pages` argument.
|
||||
- No image or multimodal file reads.
|
||||
- No directory listing through `read`; if needed, listing becomes a separate future tool.
|
||||
|
||||
### `write`
|
||||
|
||||
`write` creates or fully replaces a UTF-8 text file.
|
||||
|
||||
Arguments:
|
||||
|
||||
- `file_path: string` — required. Path to write, resolved by `ctx.fs`.
|
||||
- `content: string` — required. Full UTF-8 text content to write.
|
||||
|
||||
Under the default fs-policy, updating an existing file with `write` requires a prior observation (a read/write/edit) of that file by the same execution context; the `dsh-fs-policy` plugin supplies the observed version as the stale guard on `fs/write-intent`. Creating a new file does not require a prior observation. With the policy plugin absent, `write` is an unconditional bare-provider create-or-overwrite.
|
||||
|
||||
The schema does not expose `expected_hash`, `expected_version`, or `create_only` as model-facing parameters. Stale-version checks are driven by backend-produced versions and the policy plugin's observed state, not by asking the model to copy version tokens through the schema.
|
||||
|
||||
### `edit`
|
||||
|
||||
`edit` updates an existing UTF-8 text file by replacing literal text.
|
||||
|
||||
Arguments:
|
||||
|
||||
- `file_path: string` — required. Path to edit, resolved by `ctx.fs`.
|
||||
- `old_string: string` — required. Literal text to replace. Empty strings are invalid in the first pass.
|
||||
- `new_string: string` — required. Literal replacement text; an empty string deletes the match.
|
||||
- `replace_all?: boolean` — optional. Defaults to false. When false, `old_string` must identify exactly one match.
|
||||
|
||||
`edit` requires a prior observation of the file in the same execution context (any windowed read counts — authorization is version freshness, not a full-view requirement), or a prior write/edit by that context. The `dsh-fs-policy` policy plugin derives the owner and supplies the recorded version as the stale guard; the provider's mutation lock enforces it.
|
||||
|
||||
The first pass rejects Codex-style patch grammars and multi-mode edit APIs. It uses one strict literal replacement mode so the model-facing contract stays simple and the backend can own exact-match, duplicate-match, line-ending, and stale-version semantics.
|
||||
|
||||
## Result shape
|
||||
|
||||
The first implementation returns `ContentBlock[]` through the existing `ToolDefinition.execute()` contract. `ctx.fs` returns structured filesystem results and owns file-state recording/refreshing; `tool-fs` formats those results into the model projection.
|
||||
|
||||
Default native projections:
|
||||
|
||||
| Tool | Structured `ctx.fs` outcome consumed by `tool-fs` | Default model projection |
|
||||
|---|---|---|
|
||||
| `read` | returned lines, returned line count, total line count, target display path, file version, partial-view flag | line-numbered text plus pagination footer |
|
||||
| `write` | create/update operation, target display path, new file version | concise create/update success text |
|
||||
| `edit` | replacement count, replace-all flag, target display path, new file version | concise edit success text |
|
||||
|
||||
The structured outcome should not restate model arguments such as `file_path`, `old_string`, or `content` unless the backend has resolved them into new information such as `displayPath`, `targetKey`, or a new version. Token-conscious truncation is part of the model projection, not the backend's canonical result.
|
||||
|
||||
## Deferred
|
||||
|
||||
The following are deliberately out of scope for the first filesystem schema pass:
|
||||
|
||||
- Model-facing `expected_hash`, `expected_version`, or `create_only` parameters.
|
||||
- Directory listing, glob, grep, and search tools.
|
||||
- Binary-safe read/write operations.
|
||||
- PDF/image/multimodal `read`.
|
||||
- Code Mode projection values for filesystem tools.
|
||||
- A canonical edit diff format.
|
||||
|
||||
## Tests
|
||||
|
||||
`dsh-tool-fs` schema tests should assert:
|
||||
|
||||
- `read` requires `file_path` and accepts optional positive integer `offset` / `limit`.
|
||||
- `write` requires `file_path` and `content`.
|
||||
- `edit` requires `file_path`, `old_string`, and `new_string`, accepts optional boolean `replace_all`, rejects empty `old_string`, and defaults `replace_all` to false.
|
||||
- The registered JSON schemas use the snake_case field names in this RFC.
|
||||
- The tool descriptions accurately describe that, under the default fs-policy, existing-file `write` and `edit` require a prior observation (any windowed read counts) in the same execution context, while new-file `write` does not.
|
||||
- The `tool-fs` root plugin registers all three schemas.
|
||||
|
||||
Integration tests should execute `read`, `write`, and `edit` through `ctx.tools.execute()` against the real `dsh-fs-local` provider and verify that model arguments are translated into the expected `ctx.fs` calls and `fs/*` dispatches.
|
||||
|
||||
## Risks
|
||||
|
||||
**The first schema is intentionally smaller than Claude Code's.** Dropping PDF pages, multimodal read, rich grep/list flags, and expected hash fields keeps the first implementation focused, but users may ask for those quickly. They should be added as separate RFCs or focused follow-ups rather than overloaded into the initial schema.
|
||||
|
||||
**No explicit model-facing stale guard in v1.** The schema does not ask the model to provide an expected hash/version. That is intentional: stale checks come from backend-produced versions and the `dsh-fs-policy` plugin's observed state, not from fragile model-copied tokens. Filesystem safety failures surface through structured `FsError` codes owned by `dsh-fs`, not through model-supplied version fields.
|
||||
|
||||
**Naming becomes public surface.** Once shipped, changing `file_path` to `filePath` or `old_string` to `oldString` would churn prompts, examples, and downstream clients. This RFC chooses snake_case up front and treats it as the stable model-facing contract.
|
||||
@@ -0,0 +1,120 @@
|
||||
# RFC: Compaction as a capability seam (abstract contract + basic backend)
|
||||
|
||||
Status: implemented (2026-06-18; retention/seam reform 2026-06-26)
|
||||
|
||||
## Context
|
||||
|
||||
A long-running agent conversation grows without bound. As the event log accumulates turns, the derived message history eventually approaches the model's context window — the model then truncates mid-response (`max-tokens`) or degrades. **Compaction** is the mitigation: replace a run of older history with a concise summary, keeping recent context intact.
|
||||
|
||||
The [session surface](../../implemented/architecture/2026-06-18-session-surface.md) was built as the foundation for exactly this — a linked list over the event log with a `surfaceOp: { op: 'replace', start, end }` operation purpose-built to shadow a range of nodes and insert a replacement, with `sourceEventSeqs` recording provenance so the decision replays deterministically. What remained was the plugin that *decides what to compact and produces the summary*.
|
||||
|
||||
Two forces shape the design. First, compaction is **swappable**: token counting can be a char/4 heuristic or a real tokenizer, and summarization can be a model call, a template, or a remote service — these vary independently of *when* and *which range* to compact. Second, a later commit (`ce43c25`) closed `SurfaceEventType` to five event types (`user/message`, `assistant/message`, `tool/result`, `context/message`, `steering/message`); only those may carry `surfaceOp`. A bespoke `compaction/*` event therefore **cannot** itself appear on the surface — the compiler rejects `surfaceOp` on it and the invariants plugin rejects it at runtime.
|
||||
|
||||
## Decision
|
||||
|
||||
### Compaction is a capability seam, split interface / implementation
|
||||
|
||||
Per the [capability-seams RFC](../../implemented/architecture/2026-06-13-capability-seams.md), compaction ships as separate packages so the contract, the algorithm, and (later) the consumer surface evolve independently:
|
||||
|
||||
1. **Interface** — `@deepseek-ai/dsh-compact`: an abstract `CompactService` owning the `ctx.compact` key, the `CompactionResult` vocabulary, and the `compact/*` session events. It declares `compactIfNeeded()` and `compactRegion()` as **abstract** — the contract states *what* compaction does, not *how*.
|
||||
2. **Implementation** — `@deepseek-ai/dsh-compact-basic`: a concrete `BasicCompactService` that owns the entire algorithm — token estimation (char/4 + per-block overhead), the tail→head retention walk, summarization via `ctx.llm.stream()`, the surface replacement, the lock, and the `agent/pre-step` auto-compaction listener. A tokenizer-based or template-based backend is a sibling package (or a subclass overriding the two protected estimation/summarization hooks).
|
||||
3. **Consumer** — deferred. A `/compact` tool and slash command will `inject: ['compact']` and call the contract; they are intentionally out of scope here so the seam settles first.
|
||||
|
||||
### The contract depends on `dsh-session` and `dsh-llm` — a deliberate deviation
|
||||
|
||||
The capability-seams RFC states the interface package "depends only on cordis" (true of `dsh-bash`, whose vocabulary is self-contained). Compaction **cannot** honor that: its verbs are defined *over* a `Session` (`compactRegion(session, start, end)`) and its output *is* the content vocabulary (`CompactionResult.summary: ContentBlock[]`). There is no way to express the contract without naming `Session`/`SessionEvent` (from `dsh-session`) and `ContentBlock` (from `dsh-llm`).
|
||||
|
||||
This is not a coupling smell — it is the contract's domain. The "only cordis" guidance was always shorthand for "the interface depends only on what the contract genuinely names, and never on an implementation." `dsh-session` and `dsh-llm` are themselves interface/vocabulary packages, not implementations; `dsh-compact` still imports no backend. The seam's real invariant — *consumers and implementations evolve independently behind an abstract service* — holds intact.
|
||||
|
||||
### Abstract `compactIfNeeded` / `compactRegion`, algorithm in the backend
|
||||
|
||||
An earlier draft put the full algorithm (the retention walk, token-summing, text extraction) as concrete methods on the interface, with only `estimateContentTokens()` and `summarize()` abstract. That recouples the contract to one strategy: a backend that wants a different retention policy or a different event-sequencing would have to fight inherited concrete code. Making both core methods abstract puts every *how* decision in the backend, where it belongs, and keeps the interface a pure statement of *what*. The backend remains internally factored — `estimateContentTokens()` and `summarize()` are `protected` hooks a sub-backend can override without reimplementing the walk — but that factoring is the backend's private concern, not the contract's.
|
||||
|
||||
`compactIfNeeded(agent, turn, step, fullSystemPrompt, signal)` takes **required** parameters (not the original all-optional shape). The auto-compaction seam (below) always supplies the agent, lifecycle context, assembled system prompt (counted toward the estimate), and the turn's abort signal, so optionality would only invite a hidden default at the seam. The session being compacted comes from the agent context. `compactRegion(session, start, end, agent, turn, step, signal?)` keeps an optional signal (a manual caller may omit it). Passing lifecycle context rather than a concrete model keeps router agents honest: the backend's summarization request can run through `agent/request`, where model-routing plugins already choose the actual model.
|
||||
|
||||
### Auto-compaction runs on `agent/pre-step`, a dedicated surface-mutation seam
|
||||
|
||||
Compaction is a **surface mutation**, not a request transform — and that distinction is the seam it belongs on. The loop's request lifecycle, per step, is: assemble the system prompt → open the step → derive the message history from the surface → run the `agent/request` waterfall → call the model. An earlier cut wedged compaction into the `agent/request` waterfall, which forced two problems: (1) the loop had already derived `messages` from the *stale* surface, so the listener had to mutate the surface and then *re-derive* and overwrite `request.messages` — a double-derive whose only purpose was to undo the premature first derive; and (2) `agent/request` also carries downstream-injected context a listener might have added to `request.messages`, which compaction cannot act on (it can only compact the surface), inviting the confusion of measuring tokens compaction can't shed.
|
||||
|
||||
The fix is a dedicated loop seam, **`agent/pre-step`** (`@mode serial`), fired by the loop *after* system assembly and *before* the step opens (`step/start`):
|
||||
|
||||
```
|
||||
assembly = ctx.systemPrompt.assemble()
|
||||
await ctx.serial('agent/pre-step', agent, turn, step, system, signal) ⟵ compaction mutates the surface here
|
||||
session('step/start') ⟵ the step opens AFTER the seam
|
||||
messages = session.deriveMessages() ⟵ single derive, reflects the compaction
|
||||
request = waterfall agent/request ⟵ pure request transform (hooks, model switch)
|
||||
```
|
||||
|
||||
This makes the layering correct *by construction*: compaction mutates the surface, the loop derives **once** from the result (no double-derive), and at `pre-step` the assembled `messages` do not yet exist — so a listener structurally *cannot* see or be expected to act on downstream-injected context. `agent/request` reverts to a pure request transformer. Firing the seam **before** `step/start` (not inside the open step) is load-bearing for crash-safety: compaction's log-only `compact/*` records and its replacement node land *outside* any step, so the honest log structure a crash leaves (a dangling `compact/start` sitting before the synthetic `turn/end` that turn-repair appends) holds without a half-open step to reconcile. The seam is `serial` (awaited, in registration order), not `parallel`: a listener mutates the surface as a side effect — there is nothing to transform or return — and serial isolates listeners from each other so two surface-mutating listeners can never interleave their `session.append`s. Cordis `serial` does bail early if a listener returns a bail value, so `agent/pre-step` listeners are typed/documented to return `void` and must not use that bail channel as a semantic veto surface.
|
||||
|
||||
This **amends** the original RFC's claim of "NO changes to `dsh-agent-loop`; compaction is a pure plugin." That claim was load-bearing for a wrong design — reusing `agent/request` was the mistake. Per the pre-release "foundation over blast radius" stance, adding the correct seam (one event declaration in `dsh-agent`, one awaited emit in the loop) beats preserving a no-change boast that locked in the double-derive.
|
||||
|
||||
### Retention is turn-agnostic; tool-pairing balance is the only structural guard
|
||||
|
||||
Auto-compaction fires before **every** step, not once per turn. This is **load-bearing for runaway-turn survival**: a tool-heavy ReAct turn appends an `assistant/message` + a `tool/result` per step, so the surface grows *within* a turn. A single turn can grow past the window on its own (a "runaway turn") — and the only moment to rescue it before the next model call overflows is the next step's `pre-step` checkpoint. Gating compaction to a turn's first step (or, worse, retaining the whole in-flight turn verbatim) re-opens exactly the hole compaction exists to close: the harness would die when compaction is most needed.
|
||||
|
||||
So retention does **not** protect the in-flight turn, and turn boundaries play no role in it. `compactIfNeeded` walks the surface nodes tail→head, summing per-node token estimates, and retains the smallest tail-run of **whole units** whose total reaches `retainTokens`; everything older is compacted (head-anchored — see below). A *unit* is either a whole closed step (its `assistant/message` plus its `tool/result`s) or a single no-step node (a pre-step `user/message`, inter-step `steering/message`, or injection `context/message`). The walk rounds toward retaining *more*: when the raw token cutoff lands mid-step, it extends the retained side head-ward until the cut before the retained node is **tool-pairing balanced**. The single structural guard is therefore **tool-pairing balance** — a region's edges are balanced cuts on the *surface* (no unanswered `tool-call` crosses either edge), so a compacted region never splits a step's tool-calls from their `tool/result`s (which would produce a transcript every provider rejects). The check is decided over the surface linked list, **not** the log's `step/*` markers: a compaction lands a replacement node at a high log seq whose surface position is the head, so a log-position scan mis-reads its neighbours — `dsh-session` exports `isToolPairingBalanced(nodes, events, beforeSeq)` for the surface-anchored check. `compactRegion` enforces it strictly, throwing on a boundary that would split a step.
|
||||
|
||||
A runaway turn thus compacts exactly like any other history: its early *closed* steps get summarized while its recent steps stay verbatim. When the only compactable content left is an un-splittable open tail step (its tool-calls have no results yet), compaction declines (`null`) and retries once that step closes.
|
||||
|
||||
**Single-unit overflow is out of scope, by design.** If a single retained unit — one closed step, or a large free node such as a pasted `user/message` — *alone* exceeds the budget, compaction cannot help and the next model call may go out over-budget. Bounding an individual unit's size is a separate concern (output truncation), handled elsewhere; compaction makes no promise about it, and the harness without such a mechanism can still break on a single oversized unit. This is named honestly rather than papered over.
|
||||
|
||||
### Head-anchoring: one auto checkpoint, always at the head
|
||||
|
||||
`compactIfNeeded` always anchors the compacted range at the surface **head** (`nodes[0]`). After a first compaction lands a summary node at the head, the *second* compaction's range starts at that summary node and re-summarizes it together with the steps accumulated since — so the surface holds **at most one** auto-generated checkpoint, always at the head, re-consolidated each cycle (the backend's checkpoint-merge prompt makes this a cheap incremental merge — see below). This is *why* `CompactionResult.shadowedRange` is a **surface-position span, not a numeric seq interval**: after a replace lands a fresh high-seq summary node at an older range's position, `start` can be numerically **greater** than `end`. The range is resolved positionally (index into the ordered node list and slice), and `shadowedSeqs` is the authoritative set in surface order. (Manual `compactRegion` may target any aligned mid-range and so *can* leave several checkpoints; the checkpoint framing does not claim everything after it is recent.)
|
||||
|
||||
### Approximate convergence invariant
|
||||
|
||||
`resolveConfig` validates numeric knobs but does NOT reject based on a pretend summary-length invariant. Convergence is dynamic: provider output caps can be spent on hidden or surfaced reasoning tokens, and the model may emit a summary of unpredictable size. `maxTokens` is only the provider-side generation cap for the summarization call; reasoning blocks are stripped before the checkpoint is stored. If a compacted surface is still over threshold, `compactIfNeeded()` re-compacts the head checkpoint up to `compactionRetries` extra times, but each committed summary must be smaller than the content it shadows. The sole residual is the single-unit-overflow case above (a backward-rounded oversized step can push the retained tail over budget) — which is exactly the out-of-scope concern, not a thrash bug.
|
||||
|
||||
### Surface replacement: `compact/*` events are log-only; one `user/message` carries the summary
|
||||
|
||||
Because `SurfaceEventType` is closed, the summary cannot ride on a `compact/*` event. The backend instead appends a **single `user/message`** with `surfaceOp: { op: 'replace', start, end }` whose `content` is the (framed) summary and whose `sourceEventSeqs` covers the shadowed nodes *and* the bookkeeping events. The `compact/*` events are pure log records (lock + provenance). The surface mutation sits **inside** the lock — `compact/end` is the last event appended:
|
||||
|
||||
```
|
||||
compact/start → log-only. Acquires the lock.
|
||||
[summarize older range via the backend]
|
||||
compact/summary → log-only. Provenance: raw summary, range, shadowed seqs, token count.
|
||||
user/message → surfaceOp { op:'replace', start, end }. THE surface mutation (framed summary).
|
||||
deriveMessages() renders it as a user-role message.
|
||||
compact/end → log-only. Releases the lock (carries `error` on a recoverable failure).
|
||||
```
|
||||
|
||||
`deriveMessages()` then yields `[summary_as_user_message, ...retained_nodes]`. Reusing `user/message` is honest rather than a workaround: a summary genuinely *is* user-role context.
|
||||
|
||||
### Checkpoint framing + incremental merge (backend-private)
|
||||
|
||||
The landed `user/message` is not the raw summary: the backend wraps it in a checkpoint preamble (so a resuming model reads it as established background, not a fresh request) and `<compacted-summary>…</compacted-summary>` tags. The tags make a prior checkpoint detectable on the next cycle, and the summarization prompt then instructs the model to *merge it in place* (preserve still-true facts, drop stale) rather than re-summarize verbatim — a cheap incremental merge that needs no extra log/event machinery. The raw, unframed summary stays on the `compact/summary` provenance event. This framing is entirely a **backend HOW decision** — the contract only promises "a single replace `user/message` carries the (possibly framed) summary; the raw summary lives on `compact/summary`." A template or remote backend may frame differently or not at all.
|
||||
|
||||
### Blocking via a log-recorded lock, plus a crash/recoverable failure taxonomy
|
||||
|
||||
The `compact/start … compact/end` bracket is justified, in order of what now does the work:
|
||||
|
||||
1. **Crash-detectable orphan + provenance** (primary). Summarization is a slow model call persisted *after* `compact/start`. A crash mid-summarization leaves a `compact/start` with no matching `compact/end` — a detectable orphan. Releasing the lock last (rather than first) converts the crash window from *silent corruption* into that detectable orphan.
|
||||
2. **Prevents concurrent compaction.** `compactRegion` refuses to start if the current turn holds an unmatched `compact/start`. (The loop is single-threaded across the awaited `pre-step`, so this is also a re-entry tripwire — a thrown "already in progress" signals a real bug.)
|
||||
|
||||
Two failure paths, both documented:
|
||||
|
||||
- **Crash** (the loop dies mid-summarization): a dangling `compact/start`, no closer. Because `compact/*` are **log-only**, the orphan is **inert** — the surface replacement never landed, so the full, uncompacted history derives correctly. Generic turn-repair (`interruptedTurnClosers`) closes the turn with a synthetic `turn/end`; the orphan sits *before* that `turn/end`, so the turn-scoped in-progress check never sees it and a crash can't wedge future compaction. Compaction simply re-attempts at the next `pre-step`.
|
||||
- **Recoverable** (summarization throws but the loop survives): the backend appends `compact/end` with its **`error`** field set, leaving the surface untouched, and the model call proceeds with full history.
|
||||
|
||||
`compact/end` keeps its `error?` field (mirroring `tool/result`'s self-contained error — one event tells success from failure without correlating a sibling). There is no separate `compact/error` event.
|
||||
|
||||
**Core session repair stays compaction-agnostic — deliberately.** `interruptedTurnClosers` is never taught about `compact/*`. Teaching it would force every future `xxx/start … xxx/end` plugin pair to patch a core module — exactly the coupling the capability-seam architecture exists to avoid. Because the log-only orphan is inert, no special repair is needed: generic turn-repair plus the inertness of an un-landed surface mutation is sufficient.
|
||||
|
||||
## Consequences
|
||||
|
||||
- **New packages**: `packages/compact/compact` (interface) and a sibling `compact-basic` (backend) under `packages/compact/`, wired into the root tsconfigs. The consumer tier is deferred.
|
||||
- **New loop seam**: `agent/pre-step` (`@mode serial`) declared in `dsh-agent` and emitted by `dsh-agent-loop` after system assembly and before `step/start`. This is a documented change to the loop — `docs/architecture.md` records it and the generated cordis catalog carries its signature.
|
||||
- **`SessionEventMap`** gains `compact/start` / `compact/summary` / `compact/end` by declaration merging (merge-extensible); `SurfaceEventType` is **not** touched. These are session events, not cordis `Events`, so the event-taxonomy gate needs no entry.
|
||||
- **`dsh-session`** gains the tool-pairing balance predicate (`isToolPairingBalanced`, in `tool-pairing.ts`, exported from the package index) that `compactRegion`/`compactIfNeeded` use to keep a collapsed region from splitting a step's tool-call/result pair. The surface `replace` op and the surface-metadata runtime guard already existed and are reused.
|
||||
- **`dsh-invariants`** drops its `surface replace: start must be <= end` assertion: a head-anchored compaction lands a high-seq replacement node at an older range's *position*, so `start > end` numerically is normal and valid (the range is positional, validated by the surface's `indexOf` checks that remain). The turn-enclosure invariant is reused unchanged.
|
||||
- **Wiring**: `dsh-compact-basic` is loaded in `examples/coding-agent`'s `cordis.yml`, so the seam ships in the real demo (it was previously loaded nowhere).
|
||||
|
||||
## Testing
|
||||
|
||||
- **Unit** (`dsh-compact-basic`): the whole-unit retention walk, the convergence-invariant throw, both failure paths (`compact/end` with/without `error`), head-anchoring producing a non-monotonic `shadowedRange`, decline-on-open-tail, crash-orphan inertness, and the **runaway-turn regression** — a single oversized open turn compacts its early closed steps (proven to fail on the layer-2 protection it replaced). Driven through the real `dsh-invariants` plugin and the real Loader/inject path.
|
||||
- **Loop** (`dsh-agent-loop`): `agent/pre-step` fires once per step, after `turn/start` and before `step/start`, awaited; a surface mutation in a `pre-step` listener lands outside the step and is reflected in the single derived request.
|
||||
- **With-key e2e** (`examples/coding-agent`): a real model + real bash session with a lowered `contextWindow`/`retainTokens` triggers compaction mid-session; the test verifies the WORLD (a `compact/start…end` pair landed, the surface shrank, the agent still completed the task after compaction). This is compaction's first real-world exercise and the runaway-survival net.
|
||||
- **Snapshot (deferred, named gap)**: a full-transcript snapshot of a runaway-turn compaction is NOT yet possible — `dsh-llm-replay` derives one model call per `(turn, step)` from `assistant/chunk` events, but the summarization call records no `assistant/chunk`s and carries no `sessionId` (it binds to the anonymous cursor and claims a non-existent extra script). Covering it needs net-new replay infrastructure (record/replay an interleaved summarization call) and is scheduled as a follow-up rather than discovered mid-build.
|
||||
@@ -20,7 +20,7 @@ Pure generation is correct here because the codebase is disciplined enough that
|
||||
|
||||
Specific choices:
|
||||
|
||||
- **`@mode` tag, cross-checked.** Each harness event's JSDoc carries an explicit `@mode emit|waterfall|parallel` tag; the generator hard-errors on a missing tag. Where the signature shape is conclusive — a trailing `next: () => …` parameter is structurally a waterfall — it asserts the tag agrees and hard-errors on a contradiction. The emit-vs-parallel distinction is not structurally visible (`session/flush` returns `Promise<void> | void` with no `next`), so it is trusted from the tag. The authoring rule lives in [AGENTS.md](../../../../AGENTS.md).
|
||||
- **`@mode` tag, cross-checked.** Each harness event's JSDoc carries an explicit `@mode emit|waterfall|parallel|serial` tag; the generator hard-errors on a missing tag. Where the signature shape is conclusive — a trailing `next: () => …` parameter is structurally a waterfall — it asserts the tag agrees and hard-errors on a contradiction. The emit/parallel/serial distinction is not structurally visible (`session/flush` returns `Promise<void> | void` with no `next`, as does the ordered `agent/pre-step` checkpoint), so it is trusted from the tag. The authoring rule lives in [AGENTS.md](../../../../AGENTS.md).
|
||||
- **Tiered scope.** The harness tier (the 8 `@deepseek-ai/dsh-*` services + their events) is rendered in full from source. The inherited tier (cordis-core `ctx.on/emit/effect/provide/…` + the `internal/*` events + loader/hmr/timer) is pinned vendor source a plugin also sees; it is rendered tersely (name + one-line + source pointer) from a curated table in the generator, NOT walked from the vendor AST — the cordis-core `Context` mixes true ctx members with non-service fields (`root`, `baseUrl`, `logger`), and the vendor surface changes only on a deliberate vendor sync.
|
||||
- **Cross-links to the data-structure catalog.** A type name in a signature (`GenerateOptions`, `StreamChunk`, `ToolDefinition`, …) links to the core-data-structures page that documents it. The map is a small hand-curated const in the generator — NOT `type-equiv.manifest.json`, which documents the `…Map` symbols while signatures reference the derived union names, and lists a few symbols on two pages.
|
||||
- **A dedicated fence.** Signature blocks use a ` ```ts cordis-catalog ` info string that `doc-typecheck` recognizes and skips (a bare signature fragment is not standalone-compilable), excluded from the opt-out ratio — the same treatment `type-equiv` blocks get.
|
||||
|
||||
@@ -0,0 +1,47 @@
|
||||
# RFC: Generated tool-schema catalog (boot-and-harvest)
|
||||
|
||||
Status: implemented (accepted 2026-07-02)
|
||||
|
||||
## Context
|
||||
|
||||
A reader — a plugin author, a prompt engineer, someone auditing what the agent can do — has no single place that lists the model-facing tools the harness ships. The `name` / `description` / JSON-Schema `parameters` a tool contributes are what the model actually receives (via `ctx.systemPrompt.tools()` off `ctx.tools.schemas()`), but they are scattered across each `defineTool` call in each `packages/*/tool-*` package, buried in string concatenation and runtime spreads. The [cordis events & services catalog](../../../cordis-catalog/events-and-services.md) ([its RFC](2026-06-20-generated-cordis-catalog.md)) documents the *wiring* a plugin works against and the [core-data-structures catalog](../../../core-data-structures/core.md) documents the *vocabulary* those signatures move — but neither documents the *tools* the agent is offered. This RFC adds that third reference surface, `docs/tool-catalog/tools.md`, and a freshness gate so it cannot drift.
|
||||
|
||||
## Decision
|
||||
|
||||
Generate the catalog by **booting each tool plugin and reading its registered schemas**, not by parsing source. `scripts/gen-tool-catalog.ts` mounts each shipped tool package on a fresh cordis `Context` (with `SystemPrompt` + `ToolRegistry` and the injected seams the plugin's `apply` reads), calls `ctx.tools.schemas()` — exactly the `ToolSchema[]` the model is sent — disposes the context, and renders one `## <package>` section per package with a ` ```json ` `parameters` block per tool. It mirrors the `gen-cordis-catalog` / `gen-module-graph` CLI shape: default `--write` regenerates, `--check` fails if the committed copy is stale, output is deterministic (manifest-ordered, tools sorted by name). `verify-tool-catalog` (the `--check`) runs inside `doc-sync`, so the freshness gate fires in the same lefthook pre-push and CI paths as every other doc gate.
|
||||
|
||||
### Why boot, not parse (the crux)
|
||||
|
||||
The cordis catalog is a pure TypeScript-AST pass because every event/service name is a string literal that round-trips to a static declaration — the AST is the whole truth. **Tool schemas are not statically knowable**, so the same technique would produce a doc that lies:
|
||||
|
||||
- `tool-todo` writes `enum: [...STATUSES]` — a spread of a runtime `const`. The AST sees the spread expression, not `["pending","in_progress","completed"]`.
|
||||
- Every description is built by string **concatenation** (`'…' + '…'`). The AST sees concatenation nodes, not the final prose the model reads.
|
||||
- `tool-subagent`'s tool name is `config.toolName ?? 'subagent'` — chosen at load, not a literal.
|
||||
- An MCP plugin can register **raw JSON Schema** directly via `ctx.tools.register()` without `defineTool` at all, so enumerating `defineTool(` call sites structurally under-counts.
|
||||
|
||||
The only faithful source of truth is the schema the registry actually holds after the plugin loads. Booting is the [unit-test discipline](../../../../AGENTS.md) "verify the world, not a synthetic stand-in" applied to a doc generator: read the shipped artifact, not a re-derivation of it.
|
||||
|
||||
### Restoring "nothing silently omitted"
|
||||
|
||||
Booting has a cost the AST pass did not: there is no source declaration set to enumerate, so a new tool package could simply be forgotten. A **completeness guard** restores the guarantee — `assertManifestComplete` globs every `tool-*` package under `packages/` and hard-errors if any is absent from the generator's boot manifest. A new tool package fails the generator, and therefore `doc-sync`, until it is registered. This is the same structural property the cordis generator gets for free from enumerating source, re-created for a boot-based generator.
|
||||
|
||||
### A hand-maintained boot manifest is the irreducible policy
|
||||
|
||||
The boot manifest (`TOOL_PACKAGES`) is a hand-written list — in tension with the proposed [Discover package inventories instead of maintaining static lists](../../proposed/process/2026-06-20-discover-package-inventory.md). The tension is deliberate and resolved as follows: the *inventory* is discovered (the glob guard means no one maintains "the list of tool packages" — the filesystem is the source of truth, and drift fails the gate), but the *boot recipe* per package — which seams to plug (`bash-local` for `ctx.bash`, `subagent` + `subagent-mock` for `ctx.subagents`) and with what config (`{ provider: 'mock' }`) — is genuine policy that no layout fact encodes. Per that RFC's own "what we give up" ("stay boring: read manifests, filter on explicit fields, print the resolved list, and fail loud"), a recipe closure is the boring, explicit form; inferring seam wiring from injects would be the "too clever" path it warns against. So: discovered inventory, hand-written recipe, gate on completeness.
|
||||
|
||||
### Scope
|
||||
|
||||
Shipped product tool PACKAGES under `packages/*/tool-*`, each booted with its default config: `dsh-tool-bash` (`bash`, `bash_output`, `bash_kill`), `dsh-tool-todo` (`todo_write`), `dsh-tool-subagent` (`subagent`). The `examples/` demo tools (`echo`) are excluded, matching the cordis catalog's packages-only scope — a demo tool is not part of the product surface a reader is cataloguing.
|
||||
|
||||
The unit is the PACKAGE, not the deployed tool instance. A package's registered tool name can be a load-time config — `tool-subagent`'s `toolName` — so the same package surfaces as `subagent` (spawn backend) AND `subagent_fork` (fork backend) in the shipped `coding-agent` / `acp-agent` configs, with an identical schema. The generator boots each package once at its default and records such shipped aliases in a per-package note, rather than enumerating every deployment permutation. Cataloguing at the package level keeps the source of truth the package (what a plugin author reads) and avoids leaking example-app `cordis.yml` config into a packages-scoped generator; the note keeps the doc honest about the names a reader will actually see the model receive. The design deliberately does not attempt to catalog "every configured tool instance across every leaf config" — that is a deployment inventory, a different (and unbounded) surface.
|
||||
|
||||
### A plain `json` fence
|
||||
|
||||
Schema blocks use ` ```json `, not a bespoke `ts`-family fence. `doc-typecheck` only extracts `ts*` fences, so a JSON block is invisible to it — no `BlockKind` wiring is needed (unlike the cordis catalog's `ts cordis-catalog` fence, which had to be allowlisted so a bare signature fragment isn't compiled).
|
||||
|
||||
## Consequences
|
||||
|
||||
- The catalog cannot drift: a tool schema change the committed file doesn't reflect fails `verify-tool-catalog` in the pre-push hook and CI. A new `tool-*` package not added to the manifest fails the completeness guard outright.
|
||||
- Tool description prose has a single home — the `defineTool` `description` at the source — and the generated entry is only as good as it, the same forcing function the cordis catalog applies to event JSDoc.
|
||||
- The generator imports and executes workspace packages (the first repo script to do so; the others only read text). It runs under `tsx` via the root `tsconfig` `paths` map, the same unbuilt-source path the demos and tests use, so it needs no build step.
|
||||
- A new capability seam behind a future tool means a new manifest recipe entry (which seams to mount). This is the deliberate hand-written cost called out above; it changes only when a tool package is added.
|
||||
@@ -0,0 +1,124 @@
|
||||
# RFC: Split the filesystem seam — provider text mutations plus the `dsh-fs-policy` plugin
|
||||
|
||||
Status: implemented
|
||||
|
||||
## Problem
|
||||
|
||||
The filesystem capability from [filesystem-capability-seam](../../implemented/architecture/2026-06-17-filesystem-capability-seam.md) currently makes one abstract `FileSystem` service own two different jobs:
|
||||
|
||||
1. **Provider operations** — resolving targets, stat/version metadata, text reads/streams, atomic writes, and guarded literal edits.
|
||||
2. **Agent-facing policy** — line windows, literal edit semantics, and read-before-write/edit observed-state.
|
||||
|
||||
That makes every future backend reimplement model-facing read semantics and observation policy. `readPage` returns numbered lines and view metadata; the base service stores per-owner file state and distinguishes `full` from `partial` reads. Those are useful policies, but they are not filesystem-provider primitives. Literal text mutation is different: version guard, literal match, ambiguity detection, and atomic rewrite must stay together inside the provider mutation boundary, but the current `applyEdit` name and surrounding seam tie that provider operation to the old read-before-edit policy shape.
|
||||
|
||||
This also creates a real UX dead-end: a windowed read records `view: partial`, and partial views cannot authorize `edit`. A model that reads lines 100-150 of a large file therefore cannot edit line 120 unless it first gets a `full` read, which may be impossible for a file past the read cap. Literal edit only needs freshness: the bytes being matched must still be from the version the model read.
|
||||
|
||||
The old RFC already deferred a separate `@deepseek-ai/dsh-fs-policy` package. This RFC builds that layer and keeps `ctx.fs` close to fsspec-style storage primitives (`info`/`cat`/`open`), without turning it into full fsspec.
|
||||
|
||||
## Decision
|
||||
|
||||
Split the stack into four layers:
|
||||
|
||||
```text
|
||||
tool dsh-tool-fs model-facing schemas + read windowing + text rendering; the EXECUTOR (reads/writes/edits via ctx.fs, dispatches the fs/* events)
|
||||
policy dsh-fs-policy observed-state + read-before-edit + write/edit freshness, contributed through the fs/* event gate (no service)
|
||||
provider seam dsh-fs ctx.fs: text IO + atomic mutation primitives (optional version guard)
|
||||
provider dsh-fs-local local implementation of ctx.fs
|
||||
```
|
||||
|
||||
`dsh-tool-fs` keeps the same model-facing `read`/`write`/`edit` schemas. It is the executor: it injects `fs` (not a policy service) and reaches `ctx.fs` directly, owns read windowing, and dispatches the `fs/*` events so `dsh-fs-policy` can gate and record.
|
||||
|
||||
This RFC decided the four-layer split, the provider contract, and the freshness policy. The tool↔policy COUPLING was then refined by [the event-gate RFC](../architecture/2026-06-26-file-context-as-event-gate.md): `dsh-fs-policy` is a gate PLUGIN that participates through the `fs/*` events rather than a `ctx.fileContext` method service, so the tool is not method-coupled to it and read windowing + the fs I/O live in `dsh-tool-fs`. This document describes that landed event-gate shape; the provider's version guard is optional (omit = unconditional bare provider).
|
||||
|
||||
## Provider Contract
|
||||
|
||||
`@deepseek-ai/dsh-fs` shrinks to provider text IO plus guarded text mutation:
|
||||
|
||||
```ts ignore-check
|
||||
abstract resolve(path: string): Promise<FsTarget>
|
||||
abstract stat(target: FsTarget, signal?: AbortSignal): Promise<FsInfo | undefined>
|
||||
abstract readText(target: FsTarget, signal?: AbortSignal): Promise<string>
|
||||
abstract streamText(target: FsTarget, signal?: AbortSignal): Promise<AsyncIterable<string>>
|
||||
abstract writeText(target: FsTarget, content: string, expected: FsWriteIntent, signal?: AbortSignal): Promise<FsWriteOutcome>
|
||||
abstract editText(target: FsTarget, edit: FsEditRequest, expected: { version: FsVersion }, signal?: AbortSignal): Promise<FsEditOutcome>
|
||||
|
||||
interface FsInfo {
|
||||
version: FsVersion
|
||||
type: 'file' | 'directory' | 'other'
|
||||
size?: number
|
||||
}
|
||||
|
||||
type FsWriteIntent =
|
||||
| { kind: 'createIfAbsent' }
|
||||
| { kind: 'replaceIfVersion'; version: FsVersion }
|
||||
```
|
||||
|
||||
`stat` returns metadata, not content. `version` is the freshness token; `type` lets the executor reject directories/special files before reading; `size` lets the `read` tool choose `readText` vs `streamText` without probing by failure. `undefined` means absent.
|
||||
|
||||
`readText` reads the whole regular text file. `streamText` streams the same text semantics for large files. Both provider primitives own regular-file checks, UTF-8 decoding, binary/NUL rejection, and `FS_NOT_TEXT`; the policy layer never handles raw bytes or reimplements cross-chunk decoding. `readText` is the small-file/direct whole-file primitive, while large model-facing reads use `streamText`.
|
||||
|
||||
`writeText` is atomic temp-file + rename with an explicit write expectation. `createIfAbsent` creates a missing target and rejects an existing target with `FS_NOT_OBSERVED`; it is the path used when the owner has no prior read. `replaceIfVersion` replaces only when the target exists at the observed version; a missing target or version mismatch throws `FS_STALE_VERSION`.
|
||||
|
||||
`editText` is a provider-level guarded text mutation. When guarded it first verifies the target still exists at `expected.version`, then reads the current text, applies literal replacement, and writes atomically. The stale check must happen before literal matching so an edit based on an old read reports `FS_STALE_VERSION`, not `FS_EDIT_NOT_FOUND` or `FS_AMBIGUOUS_EDIT` from matching against newer content. Keeping this primitive on the provider seam preserves backend-local locking and lets a future remote backend implement native compare-and-edit without forcing the policy layer to pull the whole file through it.
|
||||
|
||||
This is a *text-storage* seam, deliberately half a level above byte-level fsspec (`cat`/`open` hand back raw bytes). UTF-8 decoding, binary/NUL rejection, guarded full-file writes, and guarded literal text edits live in the provider so the policy layer never touches raw bytes, reimplements cross-chunk decoding, or separates stale checks from the mutation critical section. Model-facing concepts still stay out of the provider: no line windows, numbered lines, rendered footers, or observed-state store leak down.
|
||||
|
||||
Deleted from `dsh-fs`: `readPage`, `FsExpectation`, `FsView`, `FsStateSource`, `FsReadRequest`, `FsTextLine`, line/window constants, `formatReadBody`, and the observed-state `WeakMap`. `applyEdit` is replaced by the narrower provider primitive `editText`, whose contract is version-guarded literal text mutation rather than policy-layer read authorization. The `FS_PARTIAL_OBSERVATION` code also leaves the `FsErrorCode` taxonomy: freshness authorization has no partial/full distinction, so nothing can raise it. `FsTargetKey` and `FsVersion` become branded opaque ids under the existing [branded-ids RFC](../../implemented/architecture/2026-06-20-branded-ids.md).
|
||||
|
||||
## Policy Contract
|
||||
|
||||
`@deepseek-ai/dsh-fs-policy` is a plugin, not a service: it registers no `ctx.*` key and injects nothing. It owns the write/edit freshness policy and observed-state that do not belong on the `FileSystem` provider base class (where a sandboxed/remote backend would otherwise inherit model-facing observation policy it has no business carrying). It contributes that policy through the `fs/*` event gate the executor dispatches. (This RFC originally proposed a concrete `ctx.fileContext` service with `read`/`write`/`edit` methods; [the event-gate RFC](../architecture/2026-06-26-file-context-as-event-gate.md) refined it into the plugin described here so the tool is never method-coupled to the policy.)
|
||||
|
||||
Observed state lives here as `WeakMap<owner, Map<targetKey, FsVersion>>`. An entry exists iff the owner has read, written, OR edited that target (every success emits `fs/observed`), so its presence *is* the prior-observation record — there is no separate `hasRead` flag. The owner is derived structurally from the opaque event actor (`{ agent?: { session? } }`), a shape that lives in `dsh-fs-policy`, not `dsh-fs`.
|
||||
|
||||
The plugin decides three `fs/*` events:
|
||||
|
||||
- `fs/write-intent` — no prior observation ⇒ `{ kind: 'createIfAbsent' }` (only new files can be created blindly); a prior observation ⇒ `{ kind: 'replaceIfVersion', version: vObserved }` (existing files replaced only if unchanged since the observation). Single-slot decision; does not call `next()`.
|
||||
- `fs/edit-intent` — requires a prior observation by the owner (else `FS_NOT_OBSERVED`); returns `{ version: vObserved }` as the CAS basis. It does not implement literal replacement — it authorizes and supplies the version, and the provider's mutation critical section applies the guard, so concurrent edits based on the same observed version remain one-wins/one-stale.
|
||||
- `fs/observed` — records `{ version }` for this owner+target after a successful read/write/edit. Synchronous, side-effect-only `WeakMap.set`.
|
||||
|
||||
The plugin does NO filesystem I/O: "have you observed this file?" is a `WeakMap` lookup, and "is the version you read still current?" is decided inside `ctx.fs.editText`/`writeText` in the same atomic lock that performs the mutation — the plugin only supplies `vObserved` as the basis.
|
||||
|
||||
## Tool Contract
|
||||
|
||||
`dsh-tool-fs` keeps the same schemas and prompt surface. `read` still exposes `file_path`, `offset`, and `limit`; `write` and `edit` are unchanged. It is the executor: it validates model args, reads/writes/edits through `ctx.fs` directly, owns line windowing and result rendering (`N: text`, footer, `<path>/<content>` envelope), and dispatches the `fs/*` events.
|
||||
|
||||
Each mutation dispatches its intent waterfall with an `undefined` bare-provider default, then calls `ctx.fs`, then emits `fs/observed`: e.g. `write` does `ctx.waterfall('fs/write-intent', target, exec, () => undefined)` → `ctx.fs.writeText(target, content, intent)` → `ctx.emit('fs/observed', …)`. A `read` stats once, reads/streams, builds the window, and emits `fs/observed`. Passing `exec` as the actor lets `dsh-fs-policy` derive the owner without the tool reaching into the policy.
|
||||
|
||||
Because the policy is contributed through events with an `undefined` default, `dsh-tool-fs` is not method-coupled to `dsh-fs-policy`: with the plugin absent, every intent waterfall falls through to `undefined` (unconditional bare-provider write/edit) and `fs/observed` has no listener. Loading the plugin back layers the read-before-write/edit policy on.
|
||||
|
||||
## Concurrency Boundary
|
||||
|
||||
In-process updates are safe: the local backend keeps the existing per-target mutation lock, so version-check-then-rename is serialized and a losing update sees `FS_STALE_VERSION`.
|
||||
|
||||
In-process creates are guarded by the same per-target mutation lock: two callers racing with `createIfAbsent` serialize, one creates, and the next sees the target exists and receives `FS_NOT_OBSERVED`. Cross-process creates are best-effort only; a local stat-then-rename guard cannot make portable create-exclusive guarantees across all future backends.
|
||||
|
||||
Cross-process writes are best-effort freshness plus atomic replacement: `mtime:size` usually catches editor saves, but same-tick same-size writes can miss; atomic temp+rename prevents torn files but not every lost update.
|
||||
|
||||
## Supersedes
|
||||
|
||||
This RFC reverses two decisions from [filesystem-capability-seam](../../implemented/architecture/2026-06-17-filesystem-capability-seam.md) and narrows a third:
|
||||
|
||||
- Read-before-write/edit policy moves out of `ctx.fs` and into the `dsh-fs-policy` plugin (on the `fs/*` event gate).
|
||||
- Text reads no longer return backend-numbered line records or `full`/`partial` views; authorization is based on version freshness, so a windowed read can authorize edit when the file is unchanged.
|
||||
- Literal edit no longer sits behind the old `applyEdit` API that mixed backend mutation with seam-owned observation policy. It remains a provider primitive as `editText`, because version guard + literal match + atomic rewrite must stay inside the provider's mutation critical section.
|
||||
|
||||
It keeps the interface/implementation/consumer discipline, consumer-never-imports-backend rule, backend-defined target/version/display metadata, atomic local writes, and the shared `FsError` taxonomy.
|
||||
|
||||
## Acceptance Criteria
|
||||
|
||||
- `dsh-fs` exposes exactly `resolve`/`stat`/`readText`/`streamText`/`writeText`/`editText`; `stat` returns `FsInfo | undefined`; `writeText` uses `FsWriteIntent` (`createIfAbsent` or `replaceIfVersion`); removed types/primitives are gone, and the old `applyEdit` API is replaced by `editText`.
|
||||
- `dsh-fs-policy` adds the observed-state + `read`/`write`/`edit` freshness policy and has HMR/disposal coverage. (It does so as a gate PLUGIN on the `fs/*` events with no `ctx.fileContext` service, per [the event-gate RFC](../architecture/2026-06-26-file-context-as-event-gate.md) — the original service form this RFC proposed was reworked.)
|
||||
- `dsh-tool-fs` reaches the policy decisions and model-facing schemas stay byte-for-byte unchanged; the observation contract (a read records observed-state; a direct `ctx.fs` read does not) is documented and tested. (The tool injects `fs` and dispatches the `fs/*` events rather than injecting a `fileContext` service, per the event-gate RFC.)
|
||||
- Windowed read authorizing edit is shown to fail on the pre-refit code and pass after the refit. Existing version-CAS behavior is preserved with a regression test; it is not claimed as a pre-refit failure. An edit based on a stale read must report `FS_STALE_VERSION` before attempting literal matching.
|
||||
- `dsh-fs-local` carries no line, view, or `formatReadBody` logic; it does carry provider-level `editText` logic.
|
||||
- Docs and generated artifacts are updated: `docs/architecture.md`, `packages/README.md`, fs package READMEs, `docs/core-data-structures/filesystem.md`, affected `type-equiv` blocks and `scripts/type-equiv.manifest.json`, Cordis catalog, module graph, and doc references.
|
||||
- Gates stay green: normal `doc-sync`, `pnpm run knip`, and `pnpm run test:coverage` with 100% per-file coverage.
|
||||
|
||||
## Risks
|
||||
|
||||
- Adds a fourth fs package and a new service. This is intentional: it is the previously deferred policy layer, not a second abstract backend seam.
|
||||
- Direct `ctx.fs` use bypasses the policy: a direct `ctx.fs.readText` emits no `fs/observed`, so under the default policy a later `edit` rejects with `FS_NOT_OBSERVED` until the file is read through the `read` tool. The failure is explicit and documented.
|
||||
- Large-file line windowing moves from the backend to the `read` tool in `dsh-tool-fs`; text decoding and binary rejection stay in `ctx.fs.streamText`, so this is relocation of windowing only, not a second text-IO implementation.
|
||||
- Keeping `editText` in the provider seam means every backend must implement the literal replacement contract. This is intentional: the operation is not pure storage, but stale guard + literal match + atomic rewrite is the unit that must stay together for correct error attribution and concurrency behavior. The contract should stay narrow and text-only so future backends can implement it natively or by whole-file rewrite.
|
||||
- Freshness permits full-file `write` after a windowed read. That is weaker than the old view check, but avoids making large files impossible to edit; prompt guidance should still discourage blind full replaces.
|
||||
@@ -1,59 +0,0 @@
|
||||
# RFC: Compaction as a capability seam (abstract contract + basic backend)
|
||||
|
||||
Status: proposed (2026-06-18)
|
||||
|
||||
## Context
|
||||
|
||||
A long-running agent conversation grows without bound. As the event log accumulates turns, the derived message history eventually approaches the model's context window — the model then truncates mid-response (`max-tokens`) or degrades. **Compaction** is the mitigation: replace a run of older history with a concise summary, keeping recent context intact.
|
||||
|
||||
The [session surface](../../implemented/architecture/2026-06-18-session-surface.md) was built as the foundation for exactly this — a linked list over the event log with a `surfaceOp: { op: 'replace', start, end }` operation purpose-built to shadow a range of nodes and insert a replacement, with `sourceEventSeqs` recording provenance so the decision replays deterministically. What remained was the plugin that *decides what to compact and produces the summary*.
|
||||
|
||||
Two forces shape the design. First, compaction is **swappable**: token counting can be a char/4 heuristic or a real tokenizer, and summarization can be a model call, a template, or a remote service — these vary independently of *when* and *which range* to compact. Second, a later commit (`ce43c25`) closed `SurfaceEventType` to five event types (`user/message`, `assistant/message`, `tool/result`, `context/message`, `steering/message`); only those may carry `surfaceOp`. A bespoke `compaction/*` event therefore **cannot** itself appear on the surface — the compiler rejects `surfaceOp` on it and the invariants plugin rejects it at runtime.
|
||||
|
||||
## Decision
|
||||
|
||||
### Compaction is a capability seam, split interface / implementation
|
||||
|
||||
Per the [capability-seams RFC](../../implemented/architecture/2026-06-13-capability-seams.md), compaction ships as separate packages so the contract, the algorithm, and (later) the consumer surface evolve independently:
|
||||
|
||||
1. **Interface** — `@deepseek-ai/dsh-compact`: an abstract `CompactService` owning the `ctx.compact` key, the `CompactionResult` vocabulary, and the `compact/*` session events. It declares `compactIfNeeded()` and `compactRegion()` as **abstract** — the contract states *what* compaction does, not *how*.
|
||||
2. **Implementation** — `@deepseek-ai/dsh-compact-basic`: a concrete `BasicCompactService` that owns the entire algorithm — token estimation (char/4 + per-block overhead), the tail→head retention walk, summarization via `ctx.llm.generate()`, the surface replacement, the lock, and the `agent/request` auto-compaction listener. A tokenizer-based or template-based backend is a sibling package (or a subclass overriding the two protected estimation/summarization hooks).
|
||||
3. **Consumer** — deferred. A `/compact` tool and slash command will `inject: ['compact']` and call the contract; they are intentionally out of scope here so the seam settles first.
|
||||
|
||||
### The contract depends on `dsh-session` and `dsh-llm` — a deliberate deviation
|
||||
|
||||
The capability-seams RFC states the interface package "depends only on cordis" (true of `dsh-bash`, whose vocabulary is self-contained). Compaction **cannot** honor that: its verbs are defined *over* a `Session` (`compactRegion(session, start, end)`) and its output *is* the content vocabulary (`CompactionResult.summary: ContentBlock[]`). There is no way to express the contract without naming `Session`/`SessionEvent` (from `dsh-session`) and `ContentBlock` (from `dsh-llm`).
|
||||
|
||||
This is not a coupling smell — it is the contract's domain. The "only cordis" guidance was always shorthand for "the interface depends only on what the contract genuinely names, and never on an implementation." `dsh-session` and `dsh-llm` are themselves interface/vocabulary packages, not implementations; `dsh-compact` still imports no backend. The seam's real invariant — *consumers and implementations evolve independently behind an abstract service* — holds intact. We record the deviation here so a future reader doesn't mistake it for an accident or "fix" it by smuggling `Session` behind an opaque handle.
|
||||
|
||||
### Abstract `compactIfNeeded` / `compactRegion`, algorithm in the backend
|
||||
|
||||
An earlier draft put the full algorithm (the retention walk, token-summing, text extraction) as concrete methods on the interface, with only `estimateContentTokens()` and `summarize()` abstract. That recouples the contract to one strategy: a backend that wants a different retention policy (e.g. turn-count instead of token-budget) or a different event-sequencing would have to fight inherited concrete code. Making both core methods abstract puts every *how* decision in the backend, where it belongs, and keeps the interface a pure statement of *what*. The backend remains internally factored — `estimateContentTokens()` and `summarize()` are `protected` hooks a sub-backend can override without reimplementing the walk — but that factoring is the backend's private concern, not the contract's.
|
||||
|
||||
### Surface replacement: `compact/*` events are log-only; one `user/message` carries the summary
|
||||
|
||||
Because `SurfaceEventType` is closed, the summary cannot ride on a `compact/*` event. The backend instead appends a **single `user/message`** with `surfaceOp: { op: 'replace', start, end }` whose `content` is the summary `ContentBlock[]` and whose `sourceEventSeqs` covers the shadowed nodes *and* the bookkeeping events. The `compact/*` events are pure log records (lock + provenance), never on the surface. The surface mutation sits **inside** the lock — `compact/end` is the last event appended:
|
||||
|
||||
```
|
||||
compact/start → log-only. Acquires the lock.
|
||||
[summarize older range via the backend]
|
||||
compact/summary → log-only. Provenance: summary, range, shadowed seqs, token count.
|
||||
user/message → surfaceOp { op:'replace', start, end }. THE surface mutation.
|
||||
deriveMessages() renders it as a user-role message.
|
||||
compact/end → log-only. Releases the lock.
|
||||
```
|
||||
|
||||
Ordering the surface mutation **before** `compact/end` is deliberate: `session.append()` commits one event at a time, so there is no multi-event transaction to make the sequence atomic. Releasing the lock last converts the crash window from *silent corruption* (a `compact/end` that claims compaction finished while the surface was never shadowed) into a *detectable orphaned lock* (a `compact/start` with no matching `compact/end`), which a persistence backend already detects on reload. A `session/event` listener on `compact/end` likewise never sees the lock free before the replacement has landed.
|
||||
|
||||
`deriveMessages()` then yields `[summary_as_user_message, ...retained_nodes]`. An alternative — extending `SurfaceEventType` to admit a `compact/*` type — was rejected: the closed union is a deliberate safety boundary (only message-producing events reach the model), and a summary genuinely *is* user-role context, so reusing `user/message` is honest rather than a workaround.
|
||||
|
||||
### Blocking via a log-recorded lock, not a mutex
|
||||
|
||||
Compaction must be serialized: no second compaction starts before the first finishes, and no ordinary events interleave the slow summarization. Rather than an in-memory mutex (invisible to replay, lost on crash), the lock **is** the log: `compactRegion` refuses to start if the last `compact/start` has no matching `compact/end` after it. `compact/start` is appended first (fast, synchronous), the slow model call runs, then the `compact/summary` and `user/message` replacement land, and only then is `compact/end` appended — in a `catch` that records the error, so a failed summarization can never wedge the lock. Because the backend runs compaction synchronously inside the `agent/request` waterfall, the loop is single-threaded for that window; the lock additionally gives observability and lets a persistence backend detect an orphaned `compact/start` on reload.
|
||||
|
||||
## Consequences
|
||||
|
||||
- **New packages**: `packages/compact/compact` (interface) and a sibling `compact-basic` (backend) under `packages/compact/`, wired into the three root tsconfigs. The consumer tier is deferred.
|
||||
- **`SessionEventMap`** gains `compact/start` / `compact/summary` / `compact/end` by declaration merging (merge-extensible); `SurfaceEventType` is **not** touched. These are session events, not cordis `Events`, so the event-taxonomy gate needs no entry.
|
||||
- **No changes** to `dsh-session`, `dsh-invariants`, or `dsh-agent-loop`: the surface replace op, the surface-metadata runtime guard, and the `agent/request` waterfall all already exist. Compaction is a pure plugin on documented seams.
|
||||
- The capability-seams convention gains a second reference beyond bash, and a documented case where "interface depends only on cordis" relaxes to "depends only on interface/vocabulary packages the contract genuinely names." On acceptance, [AGENTS.md](../../../../AGENTS.md) § Conventions and [architecture.md](../../../architecture.md) § "Capability seams" should note this relaxation.
|
||||
@@ -0,0 +1,284 @@
|
||||
<!-- Generated by scripts/gen-tool-catalog.ts — do not edit by hand.
|
||||
Run `pnpm run gen-tool-catalog` to regenerate. -->
|
||||
|
||||
# Tool Schema Catalog
|
||||
|
||||
Every model-facing tool a shipped plugin contributes to `ctx.tools`: the `name`, `description`, and JSON-Schema `parameters` the model receives via the system-prompt assembly. It complements the [cordis events & services catalog](../cordis-catalog/events-and-services.md) (the wiring a plugin listens to and calls) and [core-data-structures/](../core-data-structures/core.md) (the types those signatures move) — this page is the *tools* the agent is offered.
|
||||
|
||||
This file is GENERATED and verified fresh by `pnpm run verify-tool-catalog` (part of `doc-sync`) — do not edit it by hand. Unlike the cordis catalog (a pure source-AST pass), this generator BOOTS each tool plugin on a real context and reads `ctx.tools.schemas()`, because a tool schema is not statically knowable (runtime-spread enums, concatenated descriptions, config-driven names, raw-JSON-Schema MCP tools). A completeness guard globs `packages/*/tool-*` and fails if any package is missing from the generator's boot manifest, so a new tool cannot be silently undocumented. See [the tool-schema-catalog RFC](../rfc/implemented/process/2026-07-02-tool-schema-catalog.md).
|
||||
|
||||
Scope: shipped product tools under `packages/*/tool-*`, each booted with its DEFAULT config. The registered tool NAME can be a load-time config (e.g. `tool-subagent`'s `toolName`), so a deployment may surface a package under a different or additional name — a per-package note records those shipped aliases where they exist. The `examples/` demo tools (e.g. `echo`) are excluded, matching the cordis catalog's packages-only scope.
|
||||
|
||||
## `@deepseek-ai/dsh-tool-bash`
|
||||
|
||||
### `bash`
|
||||
|
||||
Execute a bash command (`bash -c`) and return its stdout/stderr. Each call runs in a fresh shell: no state (cwd, variables, functions) persists between calls — pass `workdir` instead of using `cd`. Non-zero exits are reported as `[exit code: N]`. Long output is truncated to its tail; the full output is saved to a file whose path is reported when available. Set `run_in_background: true` for long-running commands: the call returns a task id immediately; poll it with `bash_output` and stop it with `bash_kill`.
|
||||
|
||||
```json
|
||||
{
|
||||
"type": "object",
|
||||
"properties": {
|
||||
"command": {
|
||||
"type": "string",
|
||||
"description": "The bash command to execute."
|
||||
},
|
||||
"description": {
|
||||
"type": "string",
|
||||
"description": "Clear, concise description of what this command does in active voice, 5-10 words (shown in the UI). Examples: \"ls\" → \"List files in current directory\"; \"git status\" → \"Show working tree status\"; \"npm install\" → \"Install package dependencies\"."
|
||||
},
|
||||
"timeoutMs": {
|
||||
"type": "number",
|
||||
"description": "Timeout in milliseconds. The executor applies its configured default and cap, and kills the command on expiry."
|
||||
},
|
||||
"workdir": {
|
||||
"type": "string",
|
||||
"description": "Working directory for this command. Defaults to the session workspace; a relative path is resolved against it."
|
||||
},
|
||||
"run_in_background": {
|
||||
"type": "boolean",
|
||||
"description": "Run in the background and return a task id immediately. No timeout applies."
|
||||
}
|
||||
},
|
||||
"required": [
|
||||
"command",
|
||||
"description"
|
||||
]
|
||||
}
|
||||
```
|
||||
|
||||
Source: [`packages/bash/tool-bash/src/index.ts`](../../packages/bash/tool-bash/src/index.ts)
|
||||
|
||||
### `bash_kill`
|
||||
|
||||
Ask the executor to kill a running background bash task by task id.
|
||||
|
||||
```json
|
||||
{
|
||||
"type": "object",
|
||||
"properties": {
|
||||
"task_id": {
|
||||
"type": "string",
|
||||
"description": "Task id returned by the bash tool."
|
||||
}
|
||||
},
|
||||
"required": [
|
||||
"task_id"
|
||||
]
|
||||
}
|
||||
```
|
||||
|
||||
Source: [`packages/bash/tool-bash/src/index.ts`](../../packages/bash/tool-bash/src/index.ts)
|
||||
|
||||
### `bash_output`
|
||||
|
||||
Read new output from a background bash task started with `bash` + `run_in_background`. Returns only output produced since the previous bash_output call, plus the task status. Tasks keep running while you do other work; poll again later for more output.
|
||||
|
||||
```json
|
||||
{
|
||||
"type": "object",
|
||||
"properties": {
|
||||
"task_id": {
|
||||
"type": "string",
|
||||
"description": "Task id returned by the bash tool."
|
||||
}
|
||||
},
|
||||
"required": [
|
||||
"task_id"
|
||||
]
|
||||
}
|
||||
```
|
||||
|
||||
Source: [`packages/bash/tool-bash/src/index.ts`](../../packages/bash/tool-bash/src/index.ts)
|
||||
|
||||
## `@deepseek-ai/dsh-tool-fs`
|
||||
|
||||
### `edit`
|
||||
|
||||
Edit an existing UTF-8 text file by replacing literal text.
|
||||
|
||||
```json
|
||||
{
|
||||
"type": "object",
|
||||
"properties": {
|
||||
"file_path": {
|
||||
"type": "string",
|
||||
"description": "Path to edit, resolved by the filesystem backend."
|
||||
},
|
||||
"old_string": {
|
||||
"type": "string",
|
||||
"description": "Literal text to replace. Must match exactly."
|
||||
},
|
||||
"new_string": {
|
||||
"type": "string",
|
||||
"description": "Literal replacement text. Use an empty string to delete the match."
|
||||
},
|
||||
"replace_all": {
|
||||
"type": "boolean",
|
||||
"description": "Replace all matches. Defaults to false; when false, old_string must appear exactly once."
|
||||
}
|
||||
},
|
||||
"required": [
|
||||
"file_path",
|
||||
"old_string",
|
||||
"new_string"
|
||||
]
|
||||
}
|
||||
```
|
||||
|
||||
Source: [`packages/fs/tool-fs/src/index.ts`](../../packages/fs/tool-fs/src/index.ts)
|
||||
|
||||
### `read`
|
||||
|
||||
Read a UTF-8 text file and return line-numbered content.
|
||||
|
||||
```json
|
||||
{
|
||||
"type": "object",
|
||||
"properties": {
|
||||
"file_path": {
|
||||
"type": "string",
|
||||
"description": "Path to read, resolved by the filesystem backend."
|
||||
},
|
||||
"offset": {
|
||||
"type": "number",
|
||||
"description": "1-based first line to return. Defaults to 1."
|
||||
},
|
||||
"limit": {
|
||||
"type": "number",
|
||||
"description": "Maximum number of lines to return. Defaults to 2000."
|
||||
}
|
||||
},
|
||||
"required": [
|
||||
"file_path"
|
||||
]
|
||||
}
|
||||
```
|
||||
|
||||
Source: [`packages/fs/tool-fs/src/index.ts`](../../packages/fs/tool-fs/src/index.ts)
|
||||
|
||||
### `write`
|
||||
|
||||
Create or fully replace a UTF-8 text file.
|
||||
|
||||
```json
|
||||
{
|
||||
"type": "object",
|
||||
"properties": {
|
||||
"file_path": {
|
||||
"type": "string",
|
||||
"description": "Path to write, resolved by the filesystem backend."
|
||||
},
|
||||
"content": {
|
||||
"type": "string",
|
||||
"description": "Full UTF-8 text content to write."
|
||||
}
|
||||
},
|
||||
"required": [
|
||||
"file_path",
|
||||
"content"
|
||||
]
|
||||
}
|
||||
```
|
||||
|
||||
Source: [`packages/fs/tool-fs/src/index.ts`](../../packages/fs/tool-fs/src/index.ts)
|
||||
|
||||
The read-before-write/edit policy is added by `@deepseek-ai/dsh-fs-policy` (an `fs/*` event-gate plugin, no schema change); a deployment that loads these tools is expected to also load it. The tool schemas above are identical with or without the policy plugin.
|
||||
|
||||
## `@deepseek-ai/dsh-tool-skill`
|
||||
|
||||
### `skill`
|
||||
|
||||
Load the full instructions for one available skill by name. Use this when the current task matches a skill listed in the system prompt.
|
||||
|
||||
```json
|
||||
{
|
||||
"type": "object",
|
||||
"properties": {
|
||||
"name": {
|
||||
"type": "string",
|
||||
"description": "The exact skill name from the available skills list."
|
||||
}
|
||||
},
|
||||
"required": [
|
||||
"name"
|
||||
]
|
||||
}
|
||||
```
|
||||
|
||||
Source: [`packages/core/tool-skill/src/index.ts`](../../packages/core/tool-skill/src/index.ts)
|
||||
|
||||
## `@deepseek-ai/dsh-tool-subagent`
|
||||
|
||||
### `subagent`
|
||||
|
||||
Delegate a self-contained task to a subagent (a separate agent that works in its own context) and return its final result. Use this to offload focused, independent work — research, a scoped implementation, an analysis — so it does not consume this conversation's context. The subagent runs to completion and you receive only its final answer, not its intermediate steps. Give it a complete, standalone prompt: it does not see this conversation.
|
||||
|
||||
```json
|
||||
{
|
||||
"type": "object",
|
||||
"properties": {
|
||||
"description": {
|
||||
"type": "string",
|
||||
"description": "A short (3-5 word) description of the delegated task, for display."
|
||||
},
|
||||
"prompt": {
|
||||
"type": "string",
|
||||
"description": "The complete, self-contained task for the subagent. It does not share this conversation's context, so include everything it needs."
|
||||
}
|
||||
},
|
||||
"required": [
|
||||
"description",
|
||||
"prompt"
|
||||
]
|
||||
}
|
||||
```
|
||||
|
||||
Source: [`packages/subagent/tool-subagent/src/index.ts`](../../packages/subagent/tool-subagent/src/index.ts)
|
||||
|
||||
The registered tool name is the load-time `toolName` config (default `subagent`); the schema above is that default. The shipped example agents load this package once per subagent backend, so the model additionally sees `subagent_fork` (bound to the fork backend) with an identical schema — see `examples/coding-agent/cordis.yml` and `examples/acp-agent/cordis.yml`.
|
||||
|
||||
## `@deepseek-ai/dsh-tool-todo`
|
||||
|
||||
### `todo_write`
|
||||
|
||||
Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Keep AT MOST ONE todo `in_progress` at a time; while work remains, exactly one active task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished).
|
||||
|
||||
```json
|
||||
{
|
||||
"type": "object",
|
||||
"properties": {
|
||||
"todos": {
|
||||
"type": "array",
|
||||
"description": "The COMPLETE task list, replacing any previous list.",
|
||||
"items": {
|
||||
"type": "object",
|
||||
"properties": {
|
||||
"content": {
|
||||
"type": "string",
|
||||
"description": "What the task is — a short imperative line."
|
||||
},
|
||||
"status": {
|
||||
"type": "string",
|
||||
"description": "pending (not started) | in_progress (now) | completed (done).",
|
||||
"enum": [
|
||||
"pending",
|
||||
"in_progress",
|
||||
"completed"
|
||||
]
|
||||
}
|
||||
},
|
||||
"required": [
|
||||
"content",
|
||||
"status"
|
||||
]
|
||||
}
|
||||
}
|
||||
},
|
||||
"required": [
|
||||
"todos"
|
||||
]
|
||||
}
|
||||
```
|
||||
|
||||
Source: [`packages/todo/tool-todo/src/index.ts`](../../packages/todo/tool-todo/src/index.ts)
|
||||
+1
-1
@@ -20,7 +20,7 @@ A keyless smoke that spawns the example from a temp cwd must set `TSX_TSCONFIG_P
|
||||
| Example | Keyless smoke | With-key smoke |
|
||||
|---|---|---|
|
||||
| `echo-agent` | `tests/echo.e2e.ts` — boots the real `cordis.yml`, drives the echo tool round-trip and the direct canned reply | **N/A — keyless by nature** (the `mock-echo` model has no real provider) |
|
||||
| `coding-agent` | `tests/keyless-smoke.e2e.ts` — boots the full real tree (dummy key, no prompt → no model call), asserts banner + clean exit | `tests/{full-loop,coding-task,resume,todo-write}.e2e.ts` — real model + real bash + real todo_write, world-verified |
|
||||
| `coding-agent` | `tests/keyless-smoke.e2e.ts` — boots the full real tree (dummy key, no prompt → no model call), asserts banner + clean exit | `tests/{full-loop,coding-task,resume,compaction,todo-write}.e2e.ts` — real model + real bash + real todo_write, world-verified |
|
||||
| `acp-agent` | `pnpm run test:snapshot` — boots the real ACP subprocess and replays a recorded session keyless; `tests/acp.e2e.ts` also asserts stdout purity without a key | `tests/acp.e2e.ts` — real ACP prompt, verifies a file the agent wrote |
|
||||
|
||||
See [the root AGENTS.md](../AGENTS.md) for repo-wide conventions and [docs/architecture.md](../docs/architecture.md) for the design.
|
||||
+1
-1
@@ -15,7 +15,7 @@ Run with: `pnpm run demo:echo`. When prompted, type "echo <something>" to trigge
|
||||
|
||||
## coding-agent
|
||||
|
||||
The real thing: DeepSeek V4 + the bash tool suite, `subagent` delegation, and the `todo_write` task tracker on the same `@deepseek-ai/dsh-stdio-agent` app. Where echo-agent proves the skeleton with mocks, this is a usable coding assistant.
|
||||
The real thing: DeepSeek V4 + the `read`/`write`/`edit` filesystem tools + the bash tool suite, `subagent` delegation, and the `todo_write` task tracker on the same `@deepseek-ai/dsh-stdio-agent` app. Where echo-agent proves the skeleton with mocks, this is a usable coding assistant.
|
||||
|
||||
Run with: `pnpm run demo:coding` (needs `DEEPSEEK_API_KEY` in the environment or a gitignored repo-root `.env`). See [coding-agent/README.md](coding-agent/README.md) for details.
|
||||
|
||||
|
||||
@@ -6,7 +6,7 @@ The DeepSeek Harness coding agent exposed as an **Agent Client Protocol (ACP)**
|
||||
pnpm run demo:acp # needs DEEPSEEK_API_KEY (repo-root .env or env)
|
||||
```
|
||||
|
||||
This example is just a leaf `cordis.yml`: it loads the [`@deepseek-ai/dsh-acp-agent`](../../packages/ui/acp-agent) app (which bundles the [`@deepseek-ai/dsh-agent-core`](../../packages/core/agent-core) spine, JSONL session persistence, and the `@deepseek-ai/dsh-acp` bridge — with **no pre-created agents**, since ACP `session/new` creates them on demand), the swappable DeepSeek and bash backends, and the optional model-facing `subagent`/`subagent_fork`/`todo_write` tool entries. The app package bakes in the no-stdout-logger cluster, so a leaf has no logger entry to get wrong by default — keeping stdout pure for JSON-RPC.
|
||||
This example is just a leaf `cordis.yml`: it loads the [`@deepseek-ai/dsh-acp-agent`](../../packages/ui/acp-agent) app (which bundles the [`@deepseek-ai/dsh-agent-core`](../../packages/core/agent-core) spine, JSONL session persistence, and the `@deepseek-ai/dsh-acp` bridge — with **no pre-created agents**, since ACP `session/new` creates them on demand), the swappable DeepSeek, bash, and filesystem backends, and the model-facing `read`/`write`/`edit`/`subagent`/`subagent_fork`/`todo_write` tool entries. The app package bakes in the no-stdout-logger cluster, so a leaf has no logger entry to get wrong by default — keeping stdout pure for JSON-RPC.
|
||||
|
||||
## stdout is the protocol
|
||||
|
||||
@@ -28,7 +28,7 @@ Add to your Zed `settings.json` under `agent_servers`:
|
||||
}
|
||||
```
|
||||
|
||||
The editor sets each session's `cwd` to the project it opens; the agent's bash tools run there (see the per-session `cwd` note in `packages/ui/acp`), so launch the server from the harness repo with `pnpm --dir …` and let ACP carry the workspace path per session.
|
||||
The editor sets each session's `cwd` to the project it opens; both the agent's bash tools and the `read`/`write`/`edit` filesystem tools resolve relative paths against that per-session workspace (see the per-session `cwd` note in `packages/ui/acp` and [the per-session cwd RFC](../../docs/rfc/implemented/architecture/2026-07-02-fs-per-session-cwd.md)), so the server can be launched anywhere and each session still acts on its own project directory.
|
||||
|
||||
## Snapshot tests (record-once / replay-deterministic)
|
||||
|
||||
|
||||
@@ -18,7 +18,7 @@
|
||||
|
||||
# Local bash executor for agent-core's tool-bash schema.
|
||||
# FIXME(config-comments): keep this executor note from implying bash is the
|
||||
# whole tool set; subagent and todo_write are loaded below.
|
||||
# whole tool set; filesystem, subagent, and todo_write are loaded below.
|
||||
- id: bash
|
||||
name: '@deepseek-ai/dsh-bash-local'
|
||||
config:
|
||||
@@ -33,12 +33,13 @@
|
||||
systemPrompt: |
|
||||
You are a coding assistant driven over the Agent Client Protocol.
|
||||
|
||||
Your tools are bash (plus bash_output/bash_kill for background tasks)
|
||||
and subagent. Do ALL file operations through bash: read with
|
||||
cat/sed/head, search with grep, write with heredocs (cat <<'EOF' >
|
||||
file), edit with sed or a rewrite. Each bash call runs in a fresh
|
||||
shell — pass workdir instead of cd. Check the [exit code: N] marker;
|
||||
verify your work. Keep answers brief and factual.
|
||||
Your tools are read/write/edit for file operations, bash (plus
|
||||
bash_output/bash_kill for background tasks), and subagent. Use read to
|
||||
inspect UTF-8 text files, write to create or replace files, and edit for
|
||||
targeted literal replacements. Use bash for shell commands, tests,
|
||||
searches, and operations that are not ordinary file reads or edits. Each
|
||||
bash call runs in a fresh shell — pass workdir instead of cd. Check the
|
||||
[exit code: N] marker; verify your work. Keep answers brief and factual.
|
||||
|
||||
Use the subagent tool to delegate a focused, self-contained subtask to
|
||||
a fresh child agent (it works in its own context and returns only its
|
||||
@@ -85,3 +86,16 @@
|
||||
# replayed todo_write tool call resolves to a real tool during snapshot replay.
|
||||
- id: tool-todo
|
||||
name: '@deepseek-ai/dsh-tool-todo'
|
||||
|
||||
# Filesystem capability stack — identical to cordis.yml's wiring, so replayed
|
||||
# read/write/edit tool calls resolve to the real tools during snapshot replay.
|
||||
- id: fs-local
|
||||
name: '@deepseek-ai/dsh-fs-local'
|
||||
config:
|
||||
cwd: !!js process.cwd()
|
||||
|
||||
- id: fs-policy
|
||||
name: '@deepseek-ai/dsh-fs-policy'
|
||||
|
||||
- id: tool-fs
|
||||
name: '@deepseek-ai/dsh-tool-fs'
|
||||
@@ -1,8 +1,9 @@
|
||||
# The acp-agent plugin tree: the ACP server. Also the snapshot RECORD config
|
||||
# (the dsh-acp-agent bin selects it for DSH_SNAPSHOT=record): a real llm-deepseek
|
||||
# run whose persisted log the snapshot harness harvests. The swappable DeepSeek
|
||||
# adapter and local bash executor, the ACP server app (@deepseek-ai/dsh-acp-agent),
|
||||
# and the optional model-facing subagent/todo tools loaded below.
|
||||
# adapter, local bash/filesystem executors, the ACP server app
|
||||
# (@deepseek-ai/dsh-acp-agent), and the optional model-facing fs/subagent/todo
|
||||
# tools loaded below.
|
||||
#
|
||||
# CRITICAL: this tree loads NO stdout logger and NO hmr — stdout is reserved for
|
||||
# the ACP JSON-RPC protocol (see packages/ui/acp). That guarantee is now a
|
||||
@@ -24,7 +25,7 @@
|
||||
|
||||
# Local bash executor for agent-core's tool-bash schema.
|
||||
# FIXME(config-comments): keep this executor note from implying bash is the
|
||||
# whole tool set; subagent and todo_write are loaded below.
|
||||
# whole tool set; filesystem, subagent, and todo_write are loaded below.
|
||||
- id: bash
|
||||
name: '@deepseek-ai/dsh-bash-local'
|
||||
config:
|
||||
@@ -41,12 +42,13 @@
|
||||
systemPrompt: |
|
||||
You are a coding assistant driven over the Agent Client Protocol.
|
||||
|
||||
Your tools are bash (plus bash_output/bash_kill for background tasks)
|
||||
and subagent. Do ALL file operations through bash: read with
|
||||
cat/sed/head, search with grep, write with heredocs (cat <<'EOF' >
|
||||
file), edit with sed or a rewrite. Each bash call runs in a fresh
|
||||
shell — pass workdir instead of cd. Check the [exit code: N] marker;
|
||||
verify your work. Keep answers brief and factual.
|
||||
Your tools are read/write/edit for file operations, bash (plus
|
||||
bash_output/bash_kill for background tasks), and subagent. Use read to
|
||||
inspect UTF-8 text files, write to create or replace files, and edit for
|
||||
targeted literal replacements. Use bash for shell commands, tests,
|
||||
searches, and operations that are not ordinary file reads or edits. Each
|
||||
bash call runs in a fresh shell — pass workdir instead of cd. Check the
|
||||
[exit code: N] marker; verify your work. Keep answers brief and factual.
|
||||
|
||||
Use the subagent tool to delegate a focused, self-contained subtask to
|
||||
a fresh child agent (it works in its own context and returns only its
|
||||
@@ -95,3 +97,18 @@
|
||||
# session log (todo/write), surfaced to the ACP client as a `plan` update.
|
||||
- id: tool-todo
|
||||
name: '@deepseek-ai/dsh-tool-todo'
|
||||
|
||||
# Filesystem capability stack: local provider, read-before-write/edit policy
|
||||
# gate, then the model-facing read/write/edit tools. Relative filesystem paths
|
||||
# resolve from the server launch cwd; the documented Zed setup launches this
|
||||
# demo from the harness checkout with `pnpm --dir`.
|
||||
- id: fs-local
|
||||
name: '@deepseek-ai/dsh-fs-local'
|
||||
config:
|
||||
cwd: !!js process.cwd()
|
||||
|
||||
- id: fs-policy
|
||||
name: '@deepseek-ai/dsh-fs-policy'
|
||||
|
||||
- id: tool-fs
|
||||
name: '@deepseek-ai/dsh-tool-fs'
|
||||
@@ -54,6 +54,11 @@ const SCENARIOS: Scenario[] = [
|
||||
{ name: 'tool-call-turn', hasModelTurn: true, recorded: true },
|
||||
{ name: 'todo-plan', hasModelTurn: true, recorded: true },
|
||||
{ name: 'workspace-edit', hasModelTurn: true, recorded: true },
|
||||
{ name: 'fs-read', hasModelTurn: true, recorded: true },
|
||||
{ name: 'fs-write', hasModelTurn: true, recorded: true },
|
||||
{ name: 'fs-edit', hasModelTurn: true, recorded: true },
|
||||
{ name: 'fs-write-overwrite', hasModelTurn: true, recorded: true },
|
||||
{ name: 'fs-read-window', hasModelTurn: true, recorded: true },
|
||||
{ name: 'multi-turn', hasModelTurn: true, recorded: true },
|
||||
{ name: 'error-finish', hasModelTurn: true, recorded: false },
|
||||
{ name: 'cancel', hasModelTurn: true, recorded: false },
|
||||
|
||||
@@ -0,0 +1,7 @@
|
||||
{
|
||||
"steps": [
|
||||
{ "op": "initialize" },
|
||||
{ "op": "newSession" },
|
||||
{ "op": "prompt", "text": "First use the read tool to read config.txt in the current directory. Then use the edit tool (NOT bash) to replace the literal text DEBUG with RELEASE in that file. Then reply with exactly the single word DONE." }
|
||||
]
|
||||
}
|
||||
@@ -0,0 +1,147 @@
|
||||
{"type":"session","version":0,"id":"2d43b6e7-859c-4e20-9145-3bcfe4c29836","createdAt":1782993777165,"cwd":"/tmp/acp-snap-cwd-yl8qhJ"}
|
||||
{"type":"turn/start","seq":0,"time":1782993777170,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
|
||||
{"type":"user/message","seq":1,"time":1782993777170,"data":{"content":[{"type":"text","text":"First use the read tool to read config.txt in the current directory. Then use the edit tool (NOT bash) to replace the literal text DEBUG with RELEASE in that file. Then reply with exactly the single word DONE."}],"source":{"kind":"user"}},"surfaceOp":"append"}
|
||||
{"type":"step/start","seq":2,"time":1782993777171,"data":{"turn":1,"step":1}}
|
||||
{"type":"assistant/chunk","seq":3,"time":1782993777573,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"reasoning"}}}
|
||||
{"type":"assistant/chunk","seq":4,"time":1782993777573,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"Let"}}}
|
||||
{"type":"assistant/chunk","seq":5,"time":1782993777707,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" me"}}}
|
||||
{"type":"assistant/chunk","seq":6,"time":1782993777734,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" start"}}}
|
||||
{"type":"assistant/chunk","seq":7,"time":1782993777734,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" by"}}}
|
||||
{"type":"assistant/chunk","seq":8,"time":1782993777735,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" reading"}}}
|
||||
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|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" named"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" notes"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":".txt"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" with"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" content"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"hello"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" world"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\""}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" using"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" write"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" tool"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":","}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" and"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" then"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" reply"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" with"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"D"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ONE"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\"."}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_OxAUP9dIc6I1B6Coo5vs8586","title":"Write notes.txt","kind":"edit","status":"in_progress","locations":[{"path":"notes.txt"}]}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_OxAUP9dIc6I1B6Coo5vs8586","status":"completed","content":[{"type":"content","content":{"type":"text","text":"<path>{{cwd}}/notes.txt</path>\n<type>file</type>\n<content>\nCreated file\n</content>"}}]}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"The"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" file"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" was"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" created"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" successfully"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" Now"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" I"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" just"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" need"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" to"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" reply"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" with"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"D"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ONE"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\"."}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"D"}}}}
|
||||
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"ONE"}}}}
|
||||
{"jsonrpc":"2.0","id":3,"result":{"stopReason":"end_turn"}}
|
||||
@@ -1,6 +1,6 @@
|
||||
# coding-agent
|
||||
|
||||
The real stdio coding-agent wiring: DeepSeek V4 + the bash tool suite + subagent delegation + `todo_write` + stdio chat + JSONL persistence, loaded from `cordis.yml`. Where echo-agent proves the skeleton with mocks, this example is a usable coding assistant.
|
||||
The real stdio coding-agent wiring: DeepSeek V4 + the `read`/`write`/`edit` filesystem tools + the bash tool suite + subagent delegation + `todo_write` + stdio chat + JSONL persistence, loaded from `cordis.yml`. Where echo-agent proves the skeleton with mocks, this example is a usable coding assistant.
|
||||
|
||||
## Run it
|
||||
|
||||
@@ -11,7 +11,7 @@ The real stdio coding-agent wiring: DeepSeek V4 + the bash tool suite + subagent
|
||||
pnpm run demo:coding
|
||||
```
|
||||
|
||||
Type a coding task. The agent works through `bash` (+ `bash_output` / `bash_kill` for background tasks): file reads, writes, searches, and test runs all happen through shell commands, each in a fresh `bash -c` (the system prompt tells the model to pass `workdir` instead of `cd`). It can also delegate with `subagent`/`subagent_fork` and track multi-step work with `todo_write` (a whole-list task tracker rendered as a checklist). Reasoning streams dimmed; tool calls/results render inline.
|
||||
Type a coding task. The agent works through the `read`/`write`/`edit` filesystem tools for ordinary file operations and `bash` (+ `bash_output` / `bash_kill` for background tasks) for shell commands, searches, and test runs, each in a fresh `bash -c` (the system prompt tells the model to pass `workdir` instead of `cd`). Both the fs tools and bash resolve relative paths against the session workspace. It can also delegate with `subagent`/`subagent_fork` and track multi-step work with `todo_write` (a whole-list task tracker rendered as a checklist). Reasoning streams dimmed; tool calls/results render inline.
|
||||
|
||||
```
|
||||
> fix the failing test in /path/to/project
|
||||
@@ -44,12 +44,14 @@ This example is a thin leaf `cordis.yml`: it picks the swappable backends, loads
|
||||
| `subagent`, `subagent-spawn`, `subagent-fork` | the subagent provider registry plus the two in-process backends: a fresh child and a child seeded with the parent's completed-turn prefix |
|
||||
| `tool-subagent`, `tool-subagent-fork` | two model-facing `dsh-tool-subagent` loads, each bound to a different provider and exposed under a distinct tool name (`subagent`, `subagent_fork`) |
|
||||
| `tool-todo` | the model-facing `todo_write` tool; writes the whole task list to the session log and renders as a checklist in stdio |
|
||||
| `fs-local`, `fs-policy`, `tool-fs` | the filesystem stack: the local `ctx.fs` provider, the read-before-write/edit policy gate (on the `fs/*` event gate), and the model-facing `read`/`write`/`edit` tools. Relative paths resolve against the session workspace |
|
||||
|
||||
## End-to-end tests (`pnpm run test:e2e`, key-gated)
|
||||
|
||||
- `tests/full-loop.e2e.ts` — the canary: real model runs `echo e2e-ok` through the real bash tool; asserts `tool/call`/`tool/result` session events and the final answer.
|
||||
- `tests/coding-task.e2e.ts` — the swebench-style smoke: a temp dir holds `add.js` (with `a - b` where `a + b` belongs) and a failing `add.test.js`; the agent must fix the bug and verify. The test re-runs `node add.test.js` ITSELF and inspects the files — agent claims are not trusted.
|
||||
- `tests/resume.e2e.ts` — durable continuity across processes: run 1 tells the real model a secret code and persists the turn to a temp JSONL root, then the whole context is disposed; run 2 is a fresh context over the same root that RESUMES the session id and asks the model to recall the code. The recall can only come from the rehydrated log.
|
||||
- `tests/compaction.e2e.ts` — the compaction smoke: a real multi-step bash task runs with a deliberately tiny context window so the auto-compaction listener fires MID-SESSION. Verifies the WORLD — a `compact/start…end` pair landed in the real log, the surface shrank (a replace node shadowed older nodes), and the agent still produced a correct final answer after compaction.
|
||||
- `tests/todo-write.e2e.ts` — a real model drives the real `todo_write` tool and the test verifies the resulting `todo/write` session event.
|
||||
|
||||
These self-skip without `DEEPSEEK_API_KEY`.
|
||||
These self-skip without `DEEPSEEK_API_KEY`. The keyless boot smoke is `tests/keyless-smoke.e2e.ts` (boots the full real tree with a dummy key and no prompt, so no model call), which runs in the default e2e gate.
|
||||
@@ -25,12 +25,12 @@
|
||||
apiKey: !!js process.env.DEEPSEEK_API_KEY
|
||||
baseURL: !!js process.env.DEEPSEEK_BASE_URL
|
||||
models:
|
||||
- deepseek-v4-flash
|
||||
- deepseek-v4-pro
|
||||
- deepseek-v4-flash
|
||||
|
||||
# Local bash executor for agent-core's tool-bash schema.
|
||||
# FIXME(config-comments): keep this executor note from implying bash is the
|
||||
# whole tool set; subagent and todo_write are loaded below.
|
||||
# whole tool set; filesystem, subagent, and todo_write are loaded below.
|
||||
- id: bash
|
||||
name: '@deepseek-ai/dsh-bash-local'
|
||||
config:
|
||||
@@ -46,16 +46,17 @@
|
||||
# under ./.sessions); unset starts a fresh session each run.
|
||||
resumeSessionId: !!js process.env.RESUME_SESSION_ID
|
||||
persistenceRoot: './.sessions'
|
||||
welcome: 'coding-agent ready. Give it a coding task (its tools are bash, subagent, and todo_write).'
|
||||
welcome: 'coding-agent ready. Give it a coding task (its tools are read, write, edit, bash, subagent, and todo_write).'
|
||||
systemPrompt: |
|
||||
You are coding-agent, a CLI coding assistant.
|
||||
|
||||
Your tools are bash (plus bash_output/bash_kill for background
|
||||
tasks) and subagent. Do ALL file operations through bash: read with
|
||||
cat/sed/head, search with grep, write with heredocs (cat <<'EOF' >
|
||||
file), edit with sed or a rewrite. Each bash call runs in a fresh
|
||||
shell — pass workdir instead of cd, and never rely on shell state
|
||||
between calls.
|
||||
Your tools are read/write/edit for file operations, bash (plus
|
||||
bash_output/bash_kill for background tasks), and subagent. Use read to
|
||||
inspect UTF-8 text files, write to create or replace files, and edit for
|
||||
targeted literal replacements. Use bash for shell commands, tests,
|
||||
searches, and operations that are not ordinary file reads or edits. Each
|
||||
bash call runs in a fresh shell — pass workdir instead of cd, and never
|
||||
rely on shell state between calls.
|
||||
|
||||
Use the subagent tool to delegate a focused, self-contained subtask
|
||||
to a fresh child agent (it works in its own context and returns only
|
||||
@@ -73,6 +74,20 @@
|
||||
task completed as soon as it is done. Skip it for trivial single-step
|
||||
tasks.
|
||||
|
||||
# Automatic context compaction: when the derived history approaches the model's
|
||||
# context window, summarize an older range into a checkpoint so a long-running
|
||||
# or tool-heavy session keeps fitting. A leaf entry (needs ctx.llm + the
|
||||
# agent-loop's `agent/pre-step` seam from the app above).
|
||||
- id: compact-basic
|
||||
name: '@deepseek-ai/dsh-compact-basic'
|
||||
config:
|
||||
contextWindow: 128000
|
||||
thresholdRatio: 0.8
|
||||
retainTokens: 20480
|
||||
summarizationModel: ''
|
||||
maxTokens: 8192
|
||||
compactionRetries: 1
|
||||
|
||||
# The subagent seam + BOTH in-process backends + two model-facing tools, as leaf
|
||||
# entries after the app (which provides ctx.agents/ctx.tools). spawn (a fresh
|
||||
# child) and fork (a child seeded with the parent's completed-turn prefix) are
|
||||
@@ -109,3 +124,17 @@
|
||||
# session log (todo/write), rendered as a stdio checklist / ACP plan.
|
||||
- id: tool-todo
|
||||
name: '@deepseek-ai/dsh-tool-todo'
|
||||
|
||||
# Filesystem capability stack: local provider, read-before-write/edit policy
|
||||
# gate, then the model-facing read/write/edit tools. stdio-agent is a single
|
||||
# session, so relative paths resolve from the process cwd (the workspace).
|
||||
- id: fs-local
|
||||
name: '@deepseek-ai/dsh-fs-local'
|
||||
config:
|
||||
cwd: !!js process.cwd()
|
||||
|
||||
- id: fs-policy
|
||||
name: '@deepseek-ai/dsh-fs-policy'
|
||||
|
||||
- id: tool-fs
|
||||
name: '@deepseek-ai/dsh-tool-fs'
|
||||
@@ -0,0 +1,108 @@
|
||||
import { mkdtemp, rm, writeFile } from 'node:fs/promises'
|
||||
import { tmpdir } from 'node:os'
|
||||
import { join } from 'node:path'
|
||||
import { afterEach, describe, expect, it } from 'vitest'
|
||||
import type { Context } from 'cordis'
|
||||
import { AgentId } from '@deepseek-ai/dsh-agent'
|
||||
import { codingHarness, finalText, SYSTEM_PROMPT, waitForIdle } from './harness.ts'
|
||||
|
||||
/**
|
||||
* The compaction smoke test: a real model runs a multi-step bash task with a
|
||||
* deliberately tiny context window, so the auto-compaction listener fires
|
||||
* MID-SESSION and summarizes the older history into a checkpoint. This is the
|
||||
* first end-to-end exercise of the compaction seam (it is wired nowhere else),
|
||||
* and the runaway-survival regression net — it proves a session that grows past
|
||||
* the window keeps running rather than overflowing. Key-gated.
|
||||
*
|
||||
* Verifies the WORLD, not the agent's self-report: a compact/start…end pair
|
||||
* landed in the real session log, the surface actually shrank (a replace node
|
||||
* exists and shadowed older nodes), and the agent still produced a final answer
|
||||
* after compaction (so the summarized history did not break the conversation).
|
||||
*
|
||||
* FIXME(compaction-snapshot): this key-gated e2e is the ONLY coverage of runaway
|
||||
* compaction — there is no keyless full-transcript snapshot of it. dsh-llm-replay
|
||||
* reconstructs one model call per (turn, step) from `assistant/chunk` events, but
|
||||
* `summarize()` assembles its stream into a local BlockAssembler and appends no
|
||||
* `assistant/chunk`, so the interleaved summarization call is unreplayable. A
|
||||
* snapshot needs replay-harness work to serve that call; deferred as a follow-up.
|
||||
*/
|
||||
|
||||
let workdir: string | undefined
|
||||
let ctx: Context | undefined
|
||||
|
||||
afterEach(async () => {
|
||||
await ctx?.fiber.dispose()
|
||||
ctx = undefined
|
||||
if (workdir !== undefined) await rm(workdir, { recursive: true, force: true })
|
||||
workdir = undefined
|
||||
})
|
||||
|
||||
describe.skipIf(!process.env.DEEPSEEK_API_KEY)('compaction: a long session compacts mid-flight and keeps running', () => {
|
||||
it('summarizes older history into a checkpoint without breaking the task', async () => {
|
||||
workdir = await mkdtemp(join(tmpdir(), 'dsh-compaction-'))
|
||||
// A handful of files for the model to read, so multiple bash steps
|
||||
// accumulate surface nodes (tool calls + results) and grow the history past
|
||||
// the (deliberately tiny) window.
|
||||
for (let i = 1; i <= 6; i++) {
|
||||
await writeFile(join(workdir, `file${i}.txt`), `This is file number ${i}. `.repeat(40))
|
||||
}
|
||||
|
||||
// Tiny window so a couple of steps crosses the threshold. The generation
|
||||
// cap is deliberately larger than the final checkpoint because
|
||||
// reasoning-capable APIs count reasoning tokens against the provider output
|
||||
// budget even though those blocks are stripped before the checkpoint is
|
||||
// stored.
|
||||
ctx = await codingHarness(workdir, {
|
||||
compact: {
|
||||
contextWindow: 2400,
|
||||
thresholdRatio: 0.5,
|
||||
retainTokens: 500,
|
||||
summarizationModel: '',
|
||||
maxTokens: 2048,
|
||||
compactionRetries: 1,
|
||||
},
|
||||
persistenceRoot: './.sessions',
|
||||
})
|
||||
const agent = ctx.agentLoop.create(AgentId('e2e-compaction'), {
|
||||
model: 'deepseek-v4-flash',
|
||||
systemPrompt: SYSTEM_PROMPT,
|
||||
})
|
||||
|
||||
agent.send([{
|
||||
type: 'text',
|
||||
text: 'Read file1.txt, file2.txt, file3.txt, file4.txt, file5.txt, and file6.txt one at a '
|
||||
+ 'time using cat (a separate bash command for each). After reading all six, tell me how '
|
||||
+ 'many files you read and the number mentioned in file1.txt.',
|
||||
}])
|
||||
await waitForIdle(ctx, agent)
|
||||
|
||||
const events = [...agent.session.events]
|
||||
|
||||
// A compaction ran: the start…end bracket landed in the real log.
|
||||
const starts = events.filter(e => e.type === 'compact/start')
|
||||
const ends = events.filter(e => e.type === 'compact/end')
|
||||
expect(starts.length).toBeGreaterThan(0)
|
||||
expect(ends.length).toBe(starts.length) // every start was released
|
||||
|
||||
// It succeeded at least once: a compact/summary provenance event and a
|
||||
// replace-op user/message (the surface mutation) both landed.
|
||||
const summaries = events.filter(e => e.type === 'compact/summary')
|
||||
expect(summaries.length).toBeGreaterThan(0)
|
||||
const replaceNode = events.find((e) => {
|
||||
const se = e as unknown as { type: string; surfaceOp?: unknown }
|
||||
return se.type === 'user/message' && typeof se.surfaceOp === 'object' && se.surfaceOp !== null
|
||||
})
|
||||
expect(replaceNode).toBeDefined()
|
||||
|
||||
// The summary shadowed real older nodes (the surface shrank vs. the raw
|
||||
// message-producing event count).
|
||||
const summaryData = summaries[0]!.data as { shadowedSeqs: number[] }
|
||||
expect(summaryData.shadowedSeqs.length).toBeGreaterThan(0)
|
||||
|
||||
// The conversation survived compaction: the agent produced a final answer
|
||||
// that reflects the work (it read six files).
|
||||
const answer = finalText(events).toLowerCase()
|
||||
expect(answer.length).toBeGreaterThan(0)
|
||||
expect(answer).toMatch(/\b(6|six)\b/)
|
||||
}, 240_000)
|
||||
})
|
||||
@@ -11,6 +11,8 @@ import * as ToolBash from '@deepseek-ai/dsh-tool-bash'
|
||||
import * as ToolTodo from '@deepseek-ai/dsh-tool-todo'
|
||||
import * as LlmDeepSeek from '@deepseek-ai/dsh-llm-deepseek'
|
||||
import SessionPersistenceJsonl from '@deepseek-ai/dsh-session-persistence-jsonl'
|
||||
import { BasicCompactService } from '@deepseek-ai/dsh-compact-basic'
|
||||
import type { BasicCompactConfig } from '@deepseek-ai/dsh-compact-basic'
|
||||
|
||||
/**
|
||||
* Shared harness for the coding-agent e2e suites: the full plugin stack
|
||||
@@ -29,7 +31,19 @@ export const TODO_SYSTEM_PROMPT = 'You are a coding agent. For multi-step work,
|
||||
+ 'keep at most one task in_progress (exactly one while work remains), and mark '
|
||||
+ 'a task completed as soon as it is done.'
|
||||
|
||||
export async function codingHarness(workdir: string, persistenceRoot?: string): Promise<Context> {
|
||||
/** Options for {@link codingHarness}. */
|
||||
export interface CodingHarnessOptions {
|
||||
/** Durable JSONL persistence root (the resume suite needs it; others stay file-free). */
|
||||
persistenceRoot?: string
|
||||
/**
|
||||
* Load {@link BasicCompactService} with this config so the compaction e2e can
|
||||
* trigger compaction at a small, controlled history size. Omitted ⇒ no
|
||||
* compaction plugin (the default suites run without it).
|
||||
*/
|
||||
compact?: BasicCompactConfig
|
||||
}
|
||||
|
||||
export async function codingHarness(workdir: string, options: CodingHarnessOptions = {}): Promise<Context> {
|
||||
const ctx = new Context()
|
||||
await ctx.plugin(LlmService)
|
||||
await ctx.plugin(SessionStore)
|
||||
@@ -41,10 +55,13 @@ export async function codingHarness(workdir: string, persistenceRoot?: string):
|
||||
await ctx.plugin(LocalBashExecutor, { cwd: workdir, timeoutMs: 30_000 })
|
||||
await ctx.plugin(ToolBash)
|
||||
await ctx.plugin(ToolTodo)
|
||||
// Compaction is opt-in: only the compaction e2e loads it, with a lowered
|
||||
// contextWindow/retainTokens so a short real session crosses the threshold.
|
||||
if (options.compact !== undefined) await ctx.plugin(BasicCompactService, options.compact)
|
||||
// Durable JSONL persistence is opt-in: only the resume e2e needs it, and the
|
||||
// other suites stay file-free. Loaded last so a resume's deferred
|
||||
// `ctx.inject(['sessionPersistence'])` resolves once this is present.
|
||||
if (persistenceRoot !== undefined) await ctx.plugin(SessionPersistenceJsonl, { root: persistenceRoot })
|
||||
if (options.persistenceRoot !== undefined) await ctx.plugin(SessionPersistenceJsonl, { root: options.persistenceRoot })
|
||||
return ctx
|
||||
}
|
||||
|
||||
|
||||
@@ -38,7 +38,7 @@ describe.skipIf(!process.env.DEEPSEEK_API_KEY)('resume: continue a persisted ses
|
||||
// Run 1: a fresh agent on a KNOWN session id learns a secret, then we
|
||||
// dispose the whole context (simulating process exit) so only the JSONL
|
||||
// log on disk survives.
|
||||
ctx = await codingHarness(process.cwd(), root)
|
||||
ctx = await codingHarness(process.cwd(), { persistenceRoot: root })
|
||||
const first = ctx.agents.create({
|
||||
agentId: AgentId('resume-1'),
|
||||
sessionId: SESSION_ID,
|
||||
@@ -52,7 +52,7 @@ describe.skipIf(!process.env.DEEPSEEK_API_KEY)('resume: continue a persisted ses
|
||||
// Run 2: a brand-new context over the SAME root resumes the persisted
|
||||
// session. The loaded event log seeds the live session, so the model sees
|
||||
// run 1's exchange as conversation history.
|
||||
ctx = await codingHarness(process.cwd(), root)
|
||||
ctx = await codingHarness(process.cwd(), { persistenceRoot: root })
|
||||
const resumed = (await ctx.agents.resume({
|
||||
agentId: AgentId('resume-2'),
|
||||
resumeSessionId: SESSION_ID,
|
||||
|
||||
@@ -31,4 +31,4 @@ node --expose-internals --import tsx packages/ui/stdio-agent/src/bin.ts examples
|
||||
|
||||
Type a message and press Enter. "echo <text>" triggers a tool call round-trip (the mock model requests the `echo` tool, which echoes the text uppercased, and the next model step acknowledges it).
|
||||
|
||||
The session is persisted under `.sessions/` relative to the directory you launch the demo from. `pnpm run demo:echo` runs from the repo root, so the logs land in `<repo-root>/.sessions/` (a session with no cwd goes in the `_no-cwd/` bucket, one `.jsonl` log per session). Clean up with: `rm -rf .sessions`
|
||||
The session is persisted under `.sessions/` relative to the directory you launch the demo from. `pnpm run demo:echo` runs from the repo root, so the logs land in `<repo-root>/.sessions/cwd-<hash>/` (one `.jsonl` log per session). Clean up with: `rm -rf .sessions`
|
||||
@@ -44,6 +44,10 @@
|
||||
"packages/subagent/subagent-acp": {
|
||||
"entry": ["tests/**/*.spec.ts", "tests/**/*.e2e.ts", "tests/mock-acp-server.ts"],
|
||||
"project": ["src/**/*.ts", "tests/**/*.ts"]
|
||||
},
|
||||
"packages/fs/tool-fs": {
|
||||
"entry": ["tests/**/*.spec.ts", "tests/**/*.e2e.ts"],
|
||||
"project": ["src/**/*.ts", "tests/**/*.ts"]
|
||||
}
|
||||
}
|
||||
}
|
||||
+3
-1
@@ -34,10 +34,12 @@
|
||||
"verify-node-next-types": "tsx scripts/verify-node-next-types.ts",
|
||||
"gen-cordis-catalog": "tsx scripts/gen-cordis-catalog.ts",
|
||||
"verify-cordis-catalog": "tsx scripts/gen-cordis-catalog.ts --check",
|
||||
"gen-tool-catalog": "tsx scripts/gen-tool-catalog.ts",
|
||||
"verify-tool-catalog": "tsx scripts/gen-tool-catalog.ts --check",
|
||||
"gen-module-graph": "tsx scripts/gen-module-graph.ts",
|
||||
"verify-module-graph": "tsx scripts/gen-module-graph.ts --check",
|
||||
"constraints": "tsx scripts/check-workspace-constraints.ts",
|
||||
"doc-sync": "pnpm run doc-typecheck && pnpm run verify-cordis-catalog && pnpm run verify-md-wrap && pnpm run verify-md-links && pnpm run verify-doc-refs && pnpm run verify-package-paths && pnpm run verify-rfc-classification && pnpm run verify-type-equiv",
|
||||
"doc-sync": "pnpm run doc-typecheck && pnpm run verify-cordis-catalog && pnpm run verify-tool-catalog && pnpm run verify-md-wrap && pnpm run verify-md-links && pnpm run verify-doc-refs && pnpm run verify-package-paths && pnpm run verify-rfc-classification && pnpm run verify-type-equiv",
|
||||
"hygiene": "pnpm run knip && pnpm run publint && pnpm run constraints && pnpm run verify-node-next-types",
|
||||
"demo:echo": "node --expose-internals --import tsx packages/ui/stdio-agent/src/bin.ts examples/echo-agent/cordis.yml",
|
||||
"demo:coding": "node --expose-internals --import tsx packages/ui/stdio-agent/src/bin.ts examples/coding-agent/cordis.yml",
|
||||
|
||||
+14
-3
@@ -11,7 +11,8 @@ Packages are grouped by modular role at `packages/<group>/<pkg>/`. The group dir
|
||||
| [`core/`](core/README.md) | Product API spine: session, system-prompt, tools, agent, and the concrete loop | Product — stable surface |
|
||||
| [`llm/`](llm/README.md) | LLM capability family: the abstract service + provider adapters | Product — stable surface |
|
||||
| [`bash/`](bash/README.md) | Bash capability family: the executor seam, a local impl, and the model-facing tool | Product — stable surface |
|
||||
| [`compact/`](compact/README.md) | Compaction capability family: the abstract seam (backend + tool deferred) | Product — stable surface |
|
||||
| [`fs/`](fs/README.md) | Filesystem capability family: the abstract seam, a local impl, and the model-facing file tools | Product — stable surface |
|
||||
| [`compact/`](compact/README.md) | Compaction capability family: the abstract seam + a basic backend (tool deferred) | Product — stable surface |
|
||||
| [`subagent/`](subagent/README.md) | Subagent capability family: the provider-registry seam and the model-facing delegation tool | Product — stable surface |
|
||||
| [`todo/`](todo/README.md) | Todo/planning family: the model-facing `todo_write` tool (whole-list task tracking on the session log) | Product — stable surface |
|
||||
| [`session-persistence/`](session-persistence/README.md) | Persistence capability family: the seam + JSONL/SQLite backends | Product — stable surface |
|
||||
@@ -30,12 +31,17 @@ dsh-bash ← dsh-brand (abstract executor seam; b
|
||||
dsh-session ← dsh-llm, dsh-brand
|
||||
dsh-system-prompt ← dsh-llm
|
||||
dsh-agent ← dsh-llm, dsh-session, dsh-brand
|
||||
dsh-compact ← dsh-session, dsh-llm (abstract compaction seam; backend + tool deferred)
|
||||
dsh-compact ← dsh-session, dsh-llm (abstract compaction seam; tool deferred)
|
||||
dsh-compact-basic ← dsh-compact, dsh-session, dsh-llm, dsh-agent (char/4 + token-budget retention backend)
|
||||
dsh-tools ← dsh-llm, dsh-system-prompt, dsh-agent
|
||||
dsh-skill ← dsh-llm, dsh-agent
|
||||
dsh-skill ← dsh-fs, dsh-llm, dsh-agent
|
||||
dsh-tool-skill ← dsh-skill, dsh-tools, dsh-agent, dsh-llm
|
||||
dsh-bash-local ← dsh-bash (BashExecutor impl)
|
||||
dsh-tool-bash ← dsh-bash, dsh-tools (bash tool schemas)
|
||||
dsh-fs ← dsh-llm, dsh-brand (filesystem provider seam + fs/* events)
|
||||
dsh-fs-local ← dsh-fs (FileSystem impl)
|
||||
dsh-fs-policy ← dsh-fs (observed-state + freshness policy gate, no service)
|
||||
dsh-tool-fs ← dsh-fs, dsh-tools (file tools + executor)
|
||||
dsh-llm-deepseek ← dsh-llm (DeepSeek adapter)
|
||||
dsh-llm-pi-ai ← dsh-llm (pi-ai-backed adapter)
|
||||
dsh-agent-loop ← dsh-llm, dsh-session, dsh-session-persistence, dsh-system-prompt, dsh-tools, dsh-agent
|
||||
@@ -74,7 +80,12 @@ The rule: **extension** plugins depend on interfaces, never on the concrete loop
|
||||
| `bash/` | `bash` | Abstract bash executor seam (interface + vocabulary) | `ctx.bash` |
|
||||
| `bash-local/` | `bash` | Local-subprocess `BashExecutor` implementation | (registers `ctx.bash`) |
|
||||
| `tool-bash/` | `bash` | Model-facing `bash`/`bash_output`/`bash_kill` tool schemas | (registers on `ctx.tools`) |
|
||||
| `fs/` | `fs` | Filesystem provider seam: text IO + atomic mutation primitives (optional version guard); owns the `fs/*` events | `ctx.fs` |
|
||||
| `fs-local/` | `fs` | Local-filesystem `FileSystem` implementation | (registers `ctx.fs`) |
|
||||
| `fs-policy/` | `fs` | Policy gate plugin: observed-state + read-before-edit + version-guarded write/edit via the `fs/*` event gate | (no service — `fs/*` listeners) |
|
||||
| `tool-fs/` | `fs` | Model-facing `read`/`write`/`edit` tools + executor (reads via `ctx.fs`, owns read windowing, dispatches `fs/*`) | (registers on `ctx.tools`) |
|
||||
| `compact/` | `compact` | Abstract compaction seam + `compact/*` events + `CompactionResult` | `ctx.compact` |
|
||||
| `compact-basic/` | `compact` | A backend: char/4 estimation + token-budget retention + `llm.stream()` summarization | (registers `ctx.compact`) |
|
||||
| `llm-deepseek/` | `llm` | DeepSeek API adapter (hand-rolled fetch/SSE) | (registers on `ctx.llm`) |
|
||||
| `llm-pi-ai/` | `llm` | DeepSeek adapter via `@earendil-works/pi-ai` (design twin) | (registers on `ctx.llm`) |
|
||||
| `session-persistence/` | `session-persistence` | Persistence seam + write coordinator | `ctx.sessionPersistence` |
|
||||
|
||||
@@ -1,11 +1,11 @@
|
||||
# compact/ — compaction capability family
|
||||
|
||||
A three-package capability seam (see [capability seams](../../docs/rfc/implemented/architecture/2026-06-13-capability-seams.md)): an abstract compaction interface, a backend that summarizes, and the model-facing tool that consumes it. Only the interface tier exists today; the backend and consumer are deferred. All **product** packages.
|
||||
A three-package capability seam (see [capability seams](../../docs/rfc/implemented/architecture/2026-06-13-capability-seams.md)): an abstract compaction interface, a backend that summarizes, and the model-facing tool that consumes it. The interface and a first backend (`compact-basic/`) exist; the consumer tool is deferred. All **product** packages.
|
||||
|
||||
| Package | Role | ctx key |
|
||||
|---|---|---|
|
||||
| `compact/` | Abstract compaction seam (interface + `compact/*` events + `CompactionResult`) | `ctx.compact` |
|
||||
| `compact-basic/` (deferred) | A backend: char/4 estimation + token-budget retention + `llm.stream()` summarization | (registers `ctx.compact`) |
|
||||
| `compact-basic/` | A backend: char/4 estimation + token-budget retention + `llm.stream()` summarization | (registers `ctx.compact`) |
|
||||
| `tool-compact/` (deferred) | Model-facing `/compact` tool over `ctx.compact` | (registers on `ctx.tools`) |
|
||||
|
||||
The interface lives at `compact/compact/`. Unlike the bash seam, it depends on `dsh-session` and `dsh-llm` — its verbs are defined over a `Session` and its output is the `ContentBlock` vocabulary, so the contract cannot be expressed without naming them. That deviation from the "interface depends only on cordis" guidance is intentional and recorded in the [compaction capability-seam RFC](../../docs/rfc/proposed/feature/2026-06-18-compaction-capability-seam.md). A tokenizer- or template-based backend would replace `compact-basic` without touching the interface or the tool.
|
||||
The interface lives at `compact/compact/`, the backend at `compact/compact-basic/`. Unlike the bash seam, it depends on `dsh-session` and `dsh-llm` — its verbs are defined over a `Session` and its output is the `ContentBlock` vocabulary, so the contract cannot be expressed without naming them. That deviation from the "interface depends only on cordis" guidance is intentional and recorded in the [compaction capability-seam RFC](../../docs/rfc/implemented/feature/2026-06-18-compaction-capability-seam.md). A tokenizer- or template-based backend would replace `compact-basic` without touching the interface or the tool.
|
||||
@@ -0,0 +1,57 @@
|
||||
# @deepseek-ai/dsh-compact-basic
|
||||
|
||||
The **basic compaction backend**: a `BasicCompactService` implementing the `@deepseek-ai/dsh-compact` seam with a char/4 token heuristic, token-budget retention, and summarization routed through the agent request pipeline.
|
||||
|
||||
This is the implementation tier of the compaction capability — see the [interface package](../compact/README.md) for the seam and the [capability-seam RFC](../../../docs/rfc/implemented/feature/2026-06-18-compaction-capability-seam.md) for the design.
|
||||
|
||||
## What it owns
|
||||
|
||||
The abstract contract states only WHAT compaction does; this backend owns every HOW decision:
|
||||
|
||||
- **Token estimation** — `estimateContentTokens()`: char/4 with per-block structural overhead (`text`/`reasoning` = `ceil(len/4) + 4`, `tool-call` from name + arguments, `tool-result` recursive, `image` = 85, unknown blocks via JSON length).
|
||||
- **Retention policy** — `compactIfNeeded()` walks the surface nodes tail→head summing per-node token estimates, and retains the smallest tail-run of WHOLE units (a closed step, or a single no-step node such as a pre-step `user/message` or inter-step `steering/message`) whose total reaches `retainTokens`; everything older is compacted. Retention is **turn-agnostic** — turn boundaries play no role, so a single runaway turn that alone exceeds the window compacts its OWN early closed steps rather than being retained verbatim (the failure mode that motivated dropping turn-protection: a tool-heavy turn must stay compactable or the harness dies exactly when compaction is needed). The only structural guard is **tool-pairing balance**: the compacted region's edges are balanced cuts on the surface (no unanswered tool-call crosses either edge), so it never splits a step's `assistant/message` tool-calls from their `tool/result`s. When the only compactable content left is an un-splittable open tail step, it declines (returns `null`) and retries once an older step closes. **Single-unit overflow is out of scope, by design**: if one retained unit (a single closed step, or a large pasted `user/message`) ALONE exceeds the budget, compaction cannot help and the call may go out over-budget — bounding an individual unit's size is a separate concern. `compactRegion()` enforces tool-pairing balance strictly, throwing on a boundary that would split a step. `dsh-session` exports `isToolPairingBalanced` for the check.
|
||||
- **Dynamic convergence** — no static summary-length config pretends to bound what the model will write. If framing/estimator/system overhead leaves the compacted surface above threshold, `compactIfNeeded()` re-compacts the head checkpoint up to `compactionRetries` extra times; if it still cannot get below threshold, it throws. A summary whose estimated stored size is not smaller than the shadowed content fails closed before it mutates the surface.
|
||||
- **Summarization** — `summarize()`: a `GenerateOptions` request assembled via `BlockAssembler` with a fixed system prompt that asks for a structured checkpoint (Primary Request and Intent · Key Technical Concepts · Files and Code · Errors and Fixes · Pending Tasks · Current Work · Next Step · Critical Context), every section mandatory, exact paths/commands/identifiers preserved. The request runs through the `agent/request` waterfall before `ctx.llm.stream()`, so router agents that choose the concrete model there also route compaction summaries. `maxTokens` is the provider-side generation cap; only text blocks from the model's reply are kept before the checkpoint is stored (reasoning is dropped so private chain-of-thought never leaks into the durable summary, and a stray `tool-call` is dropped so the synthesized `user/message` summary cannot land an orphaned call with no matching `tool-result`). The compacted region is flattened to a plain-text transcript first: text and reasoning contribute their text, and every non-text block (image, tool-call, tool-result, plugin-added types) contributes a type-tagged placeholder (`[image]`, `[tool-call: name(args)]`, …) so the summarizer is told what existed rather than silently dropping it.
|
||||
- **Checkpoint framing** — the raw summary is not landed directly. `compactRegion()` wraps it in a checkpoint preamble (so a resuming model reads it as a checkpoint, not a fresh user request, and builds on the captured context rather than restating it) plus `<compacted-summary>…</compacted-summary>` tags. Because region compaction can be invoked manually, a surface may hold several checkpoints, so the framing does not claim everything after it is recent or verbatim. The tags make a prior checkpoint detectable in the transcript on the next compaction cycle: the summarization prompt then instructs the model to merge it in place (preserve still-true facts, drop stale ones) rather than re-summarize it verbatim — a cheap incremental merge that needs no extra log/event machinery. The unframed summary stays on the `compact/summary` provenance event.
|
||||
- **Surface mutation** — `compactRegion()` appends the `compact/start` → `compact/summary` → `compact/end` log records and the single `user/message` replace node carrying the framed summary (see the interface README).
|
||||
- **Auto-compaction** — an `agent/pre-step` listener delegates to `compactIfNeeded()` before every step (not just a turn's first — a tool-heavy turn grows the surface mid-turn, so a runaway turn still compacts, and per-step firing is the only moment to rescue it before overflow). `agent/pre-step` is a serial (awaited, in-order) surface-mutation checkpoint that fires after `turn/start` and BEFORE the step opens (`step/start`) and its request history is derived, so compaction mutates the surface — with its log-only `compact/*` records landing cleanly outside any step — and the loop derives once from the result: no double-derive, and the listener cannot see (or need to rewrite) an already-assembled `messages` array. The listener owns no threshold logic of its own (the single token-pressure check lives in `compactIfNeeded()`); because Cordis `serial` bails early on non-void return values, the listener returns `void` and does not use the dispatcher's bail channel as a veto surface.
|
||||
- **Failure handling** — the `compact/start … compact/end` bracket is a log-recorded lock: it makes a crash mid-summarization a detectable orphan (a `compact/start` with no `compact/end`), records provenance, and prevents a concurrent compaction. Two failure paths: a **crash** (the loop dies mid-summarization) leaves a dangling `compact/start` that is inert — `compact/*` events are log-only, the surface replacement never landed, so the full history derives fine and generic turn-repair closes the turn; a **recoverable** failure (summarization throws but the loop survives) appends `compact/end` with its `error` field set, leaving the surface untouched so the call proceeds with full history. Core session repair stays compaction-agnostic by design — it never learns about `compact/*`.
|
||||
|
||||
`estimateContentTokens()` and `summarize()` are overridable hooks: a tokenizer-based or template-based backend can subclass `BasicCompactService` and override just those, reusing the retention walk and surface plumbing.
|
||||
|
||||
## Config (`BasicCompactConfig`)
|
||||
|
||||
Every knob is **required** except `auto` — there is no concrete data yet to justify default thresholds/budgets, so a consumer states each value explicitly rather than inherit a guessed default. `auto` alone defaults to `true`.
|
||||
|
||||
| Key | Required | Meaning |
|
||||
|---|---|---|
|
||||
| `contextWindow` | yes | Context window size in tokens. |
|
||||
| `thresholdRatio` | yes | Compact when estimated usage exceeds this fraction of the window. |
|
||||
| `retainTokens` | yes | Tokens of recent context to keep intact. |
|
||||
| `summarizationModel` | yes | Model for summarization (`''` → use the agent's model). |
|
||||
| `maxTokens` | yes | Provider generation cap for the summarization call; may include reasoning tokens. |
|
||||
| `compactionRetries` | yes | Extra compaction attempts after the first if the compacted surface remains over threshold. |
|
||||
| `auto` | no (default `true`) | Register the `agent/pre-step` auto-compaction listener. Set `false` for manual-only. |
|
||||
|
||||
## Usage
|
||||
|
||||
```ts
|
||||
import type { Context } from 'cordis'
|
||||
import { BasicCompactService } from '@deepseek-ai/dsh-compact-basic'
|
||||
|
||||
export const name = 'compact-basic'
|
||||
export const inject = ['llm']
|
||||
|
||||
export function apply(ctx: Context): void {
|
||||
ctx.plugin(BasicCompactService, {
|
||||
contextWindow: 128000,
|
||||
thresholdRatio: 0.8,
|
||||
retainTokens: 20480,
|
||||
summarizationModel: '',
|
||||
maxTokens: 8192,
|
||||
compactionRetries: 1,
|
||||
})
|
||||
}
|
||||
```
|
||||
|
||||
Loading the plugin registers `ctx.compact`. With `auto: true` (the default) it compacts automatically under token pressure; a consumer (a future `/compact` tool) can also call `ctx.compact.compactIfNeeded(...)` or `ctx.compact.compactRegion(...)` directly.
|
||||
@@ -0,0 +1,42 @@
|
||||
{
|
||||
"name": "@deepseek-ai/dsh-compact-basic",
|
||||
"description": "Basic compaction backend (char/4 token estimation + token-budget retention + llm.generate() summarization) for the DeepSeek Harness",
|
||||
"version": "0.0.1",
|
||||
"private": true,
|
||||
"type": "module",
|
||||
"main": "lib/index.js",
|
||||
"types": "lib/types/index.d.ts",
|
||||
"exports": {
|
||||
".": {
|
||||
"types": "./lib/types/index.d.ts",
|
||||
"default": "./lib/index.js"
|
||||
},
|
||||
"./src/*": "./src/*",
|
||||
"./package.json": "./package.json"
|
||||
},
|
||||
"files": [
|
||||
"lib/index.js",
|
||||
"lib/types/**/*.d.ts",
|
||||
"lib/types/**/*.d.ts.map",
|
||||
"src"
|
||||
],
|
||||
"license": "BSD-3-Clause",
|
||||
"peerDependencies": {
|
||||
"@deepseek-ai/dsh-agent": "^0.0.1",
|
||||
"@deepseek-ai/dsh-compact": "^0.0.1",
|
||||
"@deepseek-ai/dsh-llm": "^0.0.1",
|
||||
"@deepseek-ai/dsh-session": "^0.0.1",
|
||||
"cordis": "^4.0.0-rc.6"
|
||||
},
|
||||
"devDependencies": {
|
||||
"@deepseek-ai/dsh-agent": "workspace:^",
|
||||
"@deepseek-ai/dsh-agent-loop": "workspace:^",
|
||||
"@deepseek-ai/dsh-compact": "workspace:^",
|
||||
"@deepseek-ai/dsh-invariants": "workspace:^",
|
||||
"@deepseek-ai/dsh-llm": "workspace:^",
|
||||
"@deepseek-ai/dsh-session": "workspace:^",
|
||||
"@deepseek-ai/dsh-system-prompt": "workspace:^",
|
||||
"@deepseek-ai/dsh-tools": "workspace:^",
|
||||
"cordis": "^4.0.0-rc.6"
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,746 @@
|
||||
/**
|
||||
* `BasicCompactService`: the first implementation of the
|
||||
* `@deepseek-ai/dsh-compact` seam. It owns the entire compaction strategy:
|
||||
*
|
||||
* - **Token estimation** — char/4 heuristic with per-block structural overhead.
|
||||
* - **Retention policy** — walk surface nodes tail→head, keep recent nodes up
|
||||
* to a token budget, compact everything older. The cutoff is snapped forward
|
||||
* to the next balanced tool-pairing boundary so a compacted region never
|
||||
* splits a step's tool-call/result pair (an open tail step is never crossed —
|
||||
* compaction declines and retries once it closes).
|
||||
* - **Summarization** — `ctx.llm.stream()` assembled via `BlockAssembler`
|
||||
* (the single model-call surface; same path the loop uses) with a fixed
|
||||
* condense-the-history system prompt routed through `agent/request`.
|
||||
* - **Surface mutation** — a single `user/message` replace node carries the
|
||||
* summary; `compact/*` events are log-only lock + provenance records.
|
||||
* - **Auto-compaction** — an `agent/pre-step` listener delegates to
|
||||
* {@link BasicCompactService.compactIfNeeded} before EVERY step (so a
|
||||
* tool-heavy turn that grows the surface mid-turn still compacts); it owns the
|
||||
* sole token-pressure check.
|
||||
*
|
||||
* A different backend (real tokenizer, template summarizer, turn-count
|
||||
* retention) either subclasses this and overrides the {@link
|
||||
* BasicCompactService.estimateContentTokens} / {@link
|
||||
* BasicCompactService.summarize} hooks, or implements the abstract
|
||||
* {@link CompactService} from scratch.
|
||||
*
|
||||
* @module @deepseek-ai/dsh-compact-basic
|
||||
*/
|
||||
|
||||
import { Context } from 'cordis'
|
||||
import { CompactService } from '@deepseek-ai/dsh-compact'
|
||||
import type { CompactionResult } from '@deepseek-ai/dsh-compact'
|
||||
import { BlockAssembler } from '@deepseek-ai/dsh-llm'
|
||||
import type { ContentBlock, FinishReason, GenerateOptions, Message } from '@deepseek-ai/dsh-llm'
|
||||
import type { Session, SessionEvent } from '@deepseek-ai/dsh-session'
|
||||
import { isToolPairingBalanced } from '@deepseek-ai/dsh-session'
|
||||
import type { Agent } from '@deepseek-ai/dsh-agent'
|
||||
import type { BasicCompactConfig, ResolvedConfig } from './types.ts'
|
||||
import { resolveConfig } from './types.ts'
|
||||
|
||||
export type { BasicCompactConfig, ResolvedConfig } from './types.ts'
|
||||
export { resolveConfig } from './types.ts'
|
||||
|
||||
/** Per-block structural overhead for JSON framing / type tag. */
|
||||
const BLOCK_OVERHEAD = 4
|
||||
|
||||
/** Heuristic token count for an image block (~85 tokens for low-res URL). */
|
||||
const IMAGE_TOKEN_COST = 85
|
||||
|
||||
/** Role-field framing overhead added per message in {@link BasicCompactService.estimateTokens}. */
|
||||
const ROLE_OVERHEAD = 4
|
||||
|
||||
/** Tags wrapping the structured summary inside the landed checkpoint node. */
|
||||
const SUMMARY_OPEN_TAG = '<compacted-summary>'
|
||||
const SUMMARY_CLOSE_TAG = '</compacted-summary>'
|
||||
|
||||
/**
|
||||
* The summarization system prompt: instructs the model to condense the
|
||||
* conversation into a fixed, fully-populated structure rather than freeform
|
||||
* bullets. The fixed structure guarantees coverage of the things a resuming
|
||||
* model needs (original intent, pending work, the next step, critical context)
|
||||
* and is stable across compaction cycles, so a prior checkpoint can be merged
|
||||
* in place. The final rule keys off {@link SUMMARY_OPEN_TAG}: when the
|
||||
* transcript already contains a prior checkpoint, the model consolidates rather
|
||||
* than re-summarizing it verbatim (a cheap incremental-merge that needs no
|
||||
* extra log/event machinery — the tag travels on the summary surface node).
|
||||
*/
|
||||
const SUMMARIZE_SYSTEM_PROMPT = [
|
||||
'You are a compaction engine for an AI coding assistant. Condense the conversation transcript into a structured checkpoint that lets another model resume the work with no loss of essential context.',
|
||||
'',
|
||||
'Output EXACTLY the Markdown structure below: keep every section, in order. Use terse bullets, not prose paragraphs. Write "(none)" for an empty section — never drop a section.',
|
||||
'',
|
||||
'## Primary Request and Intent',
|
||||
"- [the user's original and evolving goals; quote verbatim where the exact wording matters]",
|
||||
'',
|
||||
'## Key Technical Concepts',
|
||||
'- [technologies, frameworks, patterns, and conventions in play]',
|
||||
'',
|
||||
'## Files and Code',
|
||||
'- [exact path: why it matters, key changes or snippets]',
|
||||
'',
|
||||
'## Errors and Fixes',
|
||||
'- [error: how it was resolved, plus any related user feedback]',
|
||||
'',
|
||||
'## Pending Tasks',
|
||||
'- [explicitly requested work not yet completed]',
|
||||
'',
|
||||
'## Current Work',
|
||||
'- [precisely what was in progress at this checkpoint]',
|
||||
'',
|
||||
'## Next Step',
|
||||
'- [the single next action, directly in line with the most recent request, or "(none)"]',
|
||||
'',
|
||||
'## Critical Context',
|
||||
'- [decisions and their rationale, constraints, user preferences, open questions, data needed to continue]',
|
||||
'',
|
||||
'Rules:',
|
||||
'- Preserve exact file paths, commands, error strings, identifiers, and function signatures.',
|
||||
'- Capture user feedback and explicit instructions faithfully, especially corrections.',
|
||||
'- Do NOT mention this summarization process or that the context was compacted.',
|
||||
`- If the transcript already contains a ${SUMMARY_OPEN_TAG} block, it is a PRIOR checkpoint. Do not copy it forward verbatim: preserve still-true facts, drop stale ones, and merge newer information into a single consolidated summary under the same structure.`,
|
||||
].join('\n')
|
||||
|
||||
/**
|
||||
* Framing prepended to the landed summary so a resuming model reads it as a
|
||||
* checkpoint rather than a fresh user request, and continues the task from it.
|
||||
* It summarizes an earlier span of the conversation; the messages that follow
|
||||
* are the continuation. Because region compaction can be invoked manually, a
|
||||
* surface may hold several checkpoints, so the framing does NOT claim that
|
||||
* everything after it is recent or verbatim — only that the captured context
|
||||
* should be built on, not restated.
|
||||
*/
|
||||
const CHECKPOINT_PREAMBLE =
|
||||
'This is an automatically generated checkpoint condensing an earlier span of the conversation to free up context. Treat the captured context as established background and build on it without restating it. Continue the task directly from the messages that follow, without acknowledging this checkpoint.'
|
||||
|
||||
/**
|
||||
* Map a terminal `FinishReason` to the error a SUMMARIZATION must throw, or
|
||||
* `undefined` for an acceptable finish. `FinishReason` is merge-extensible.
|
||||
*
|
||||
* Compaction fails CLOSED on a truncated summary: `error`, `aborted`, AND
|
||||
* `max-tokens` all raise. Unlike an ordinary agent turn — where `max-tokens` is
|
||||
* a normal "the model hit its budget" outcome the loop keeps — a summary cut off
|
||||
* at the token cap is an INCOMPLETE checkpoint, and committing it would shadow
|
||||
* (discard) the real history it summarizes. Raising here keeps the original
|
||||
* surface intact (the caller appends `compact/end` with the error and the auto
|
||||
* path proceeds with full history). `stop`/future kinds are accepted.
|
||||
*/
|
||||
function finishError(finish: FinishReason): Error | undefined {
|
||||
switch (finish.kind) {
|
||||
case 'error': {
|
||||
const error = new Error(finish.message) as Error & { code?: string }
|
||||
if (finish.code !== undefined) error.code = finish.code
|
||||
return error
|
||||
}
|
||||
case 'aborted': {
|
||||
const error = new Error('summarization stream aborted') as Error & { code?: string }
|
||||
error.code = 'ABORTED'
|
||||
return error
|
||||
}
|
||||
case 'max-tokens': {
|
||||
const error = new Error('summarization truncated at the token cap (incomplete checkpoint)') as Error & { code?: string }
|
||||
error.code = 'MAX_TOKENS'
|
||||
return error
|
||||
}
|
||||
default:
|
||||
return undefined
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Basic, dependency-light compaction backend. Defaults target a 128K context
|
||||
* window, compacting at 80% utilization and retaining ~20K tokens of recent
|
||||
* context.
|
||||
*/
|
||||
export class BasicCompactService extends CompactService {
|
||||
static inject = ['llm']
|
||||
|
||||
/** Resolved configuration (`auto` defaulted). */
|
||||
readonly config: ResolvedConfig
|
||||
|
||||
constructor(ctx: Context, config: BasicCompactConfig) {
|
||||
super(ctx)
|
||||
this.config = resolveConfig(config)
|
||||
|
||||
if (this.config.auto) {
|
||||
// Auto-compaction: delegate to compactIfNeeded before EVERY step. This is
|
||||
// LOAD-BEARING for runaway-turn survival: a tool-heavy ReAct turn appends
|
||||
// an assistant/message and a tool/result per step, so the surface (and the
|
||||
// derived token count) grows WITHIN a turn. The only moment to rescue a
|
||||
// turn that alone approaches the window is the next step's pre-step
|
||||
// checkpoint; gating to a turn's first step would let a runaway turn
|
||||
// overflow before the next turn's check. The listener owns NO threshold
|
||||
// logic — compactIfNeeded is the single place that decides whether to
|
||||
// compact, and its in-progress lock serializes concurrent attempts.
|
||||
//
|
||||
// It runs on `agent/pre-step` (a serial surface-mutation checkpoint fired
|
||||
// AFTER turn/start but BEFORE step/start), NOT `agent/request`: compaction
|
||||
// mutates the session surface, and the loop derives the request `messages`
|
||||
// AFTER this fires — so a single derive already reflects the compaction,
|
||||
// with no double-derive and no need to rewrite an already-assembled
|
||||
// `messages` array. Firing pre-step (outside any open step) keeps the
|
||||
// log-only `compact/*` records and the replacement node cleanly outside a
|
||||
// step, so a crash mid-compaction leaves an inert orphan the turn-repair
|
||||
// closes — never a half-open step.
|
||||
ctx.on('agent/pre-step', async (agent: Agent, turn: number, step: number, fullSystemPrompt: string, signal: AbortSignal) => {
|
||||
try {
|
||||
const result = await this.compactIfNeeded(agent, turn, step, fullSystemPrompt, signal)
|
||||
if (result) {
|
||||
const after = this.estimateTokens(agent.session.deriveMessages(), fullSystemPrompt)
|
||||
ctx.logger.info(
|
||||
`compaction: shadowed ${result.shadowedSeqs.length} surface nodes ` +
|
||||
`(seqs ${result.shadowedRange.start}-${result.shadowedRange.end}, ` +
|
||||
`~${result.shadowedTokenCount} tokens) ` +
|
||||
`→ ${after} estimated tokens after compaction`,
|
||||
)
|
||||
}
|
||||
} catch (error: unknown) {
|
||||
// A failed compaction must not prevent the model call — the surface is
|
||||
// untouched on failure, so the loop derives the full history and the
|
||||
// call proceeds.
|
||||
const msg = error instanceof Error ? error.message : String(error)
|
||||
ctx.logger.warn(`compaction failed: ${msg}; proceeding with full history`)
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
// ---- Token estimation (overridable hooks) ----
|
||||
|
||||
// TODO: char/4 is a coarse heuristic. Replace with an exact count — a real
|
||||
// tokenizer, or the provider's post-response `usage` (input tokens) fed back
|
||||
// as a correction — so threshold decisions match the model's actual budget.
|
||||
/**
|
||||
* Estimate the token count of content blocks — char/4 with per-block
|
||||
* overhead. Override in a subclass to plug in a real tokenizer.
|
||||
*/
|
||||
estimateContentTokens(blocks: readonly ContentBlock[]): number {
|
||||
let tokens = 0
|
||||
for (const block of blocks) {
|
||||
switch (block.type) {
|
||||
case 'text':
|
||||
case 'reasoning':
|
||||
tokens += Math.ceil(block.text.length / 4) + BLOCK_OVERHEAD
|
||||
break
|
||||
case 'tool-call':
|
||||
tokens += Math.ceil(block.name.length / 4)
|
||||
+ Math.ceil(block.arguments.length / 4)
|
||||
+ BLOCK_OVERHEAD
|
||||
break
|
||||
case 'tool-result':
|
||||
tokens += this.estimateContentTokens(block.content) + BLOCK_OVERHEAD
|
||||
break
|
||||
case 'image':
|
||||
tokens += IMAGE_TOKEN_COST
|
||||
break
|
||||
default:
|
||||
// Unknown block types (merge-extensible ContentBlockMap):
|
||||
// estimate conservatively via JSON stringify.
|
||||
tokens += BLOCK_OVERHEAD + Math.ceil(JSON.stringify(block).length / 4)
|
||||
}
|
||||
}
|
||||
return tokens
|
||||
}
|
||||
|
||||
/**
|
||||
* Estimate token count for a single session event. Returns 0 for non-message
|
||||
* event types (boundaries, chunks, usage, errors, compact markers).
|
||||
*/
|
||||
estimateEventTokens(event: SessionEvent): number {
|
||||
switch (event.type) {
|
||||
case 'user/message':
|
||||
case 'assistant/message':
|
||||
case 'context/message':
|
||||
case 'steering/message':
|
||||
case 'tool/result':
|
||||
return this.estimateContentTokens(event.data.content)
|
||||
default:
|
||||
return 0
|
||||
}
|
||||
}
|
||||
|
||||
/** Estimate total tokens across a list of messages plus optional system prompt. */
|
||||
estimateTokens(messages: readonly Message[], systemPrompt?: string): number {
|
||||
let total = 0
|
||||
for (const msg of messages) {
|
||||
total += this.estimateContentTokens(msg.content)
|
||||
total += ROLE_OVERHEAD
|
||||
}
|
||||
if (systemPrompt) total += Math.ceil(systemPrompt.length / 4)
|
||||
return total
|
||||
}
|
||||
|
||||
/**
|
||||
* Summarize conversation text into content blocks via `agent/request` plus
|
||||
* `ctx.llm.stream()` assembled through a `BlockAssembler` (the single
|
||||
* model-call surface).
|
||||
* Override in a subclass for a template or remote summarizer.
|
||||
*
|
||||
* Honors the adapter failure contract: an adapter may report a model failure
|
||||
* by throwing from `stream()` (propagated here) OR by ending the stream with
|
||||
* a `finish {kind:'error'|'aborted'}` chunk — the latter is re-thrown so a
|
||||
* provider error never yields an empty summary.
|
||||
*
|
||||
* Forwards `signal` into `GenerateOptions.signal` so an abort/dispose tears
|
||||
* down the in-flight summarization rather than orphaning the model call.
|
||||
*/
|
||||
async summarize(text: string, agent: Agent, turn: number, step: number, signal?: AbortSignal): Promise<ContentBlock[]> {
|
||||
const assembler = new BlockAssembler()
|
||||
const options: GenerateOptions = {
|
||||
model: this.config.summarizationModel || agent.options.model || '',
|
||||
messages: [{
|
||||
role: 'user',
|
||||
content: [{ type: 'text', text: `Summarize this conversation history:\n\n${text}\n\nSummary:` }],
|
||||
}],
|
||||
system: SUMMARIZE_SYSTEM_PROMPT,
|
||||
maxTokens: this.config.maxTokens,
|
||||
sessionId: agent.session.id,
|
||||
}
|
||||
// exactOptionalPropertyTypes: only set `signal` when present — assigning
|
||||
// `undefined` to an optional `signal?: AbortSignal` is a type error.
|
||||
if (signal) options.signal = signal
|
||||
const request = await this.ctx.waterfall('agent/request', agent, turn, step, options, () => Promise.resolve(options))
|
||||
if (!request.model) {
|
||||
throw new Error('no model available for summarization: set BasicCompactConfig.summarizationModel, AgentOptions.model, or supply one via the agent/request waterfall')
|
||||
}
|
||||
for await (const chunk of this.ctx.llm.stream(request)) {
|
||||
assembler.push(chunk)
|
||||
}
|
||||
|
||||
const error = finishError(assembler.finish)
|
||||
if (error) throw error
|
||||
|
||||
const summary = this._textOnly(assembler.message().content)
|
||||
if (!summary.some(block => block.type === 'text' && block.text.trim().length > 0)) {
|
||||
throw new Error('summarization produced no text summary content')
|
||||
}
|
||||
|
||||
return summary
|
||||
}
|
||||
|
||||
// ---- Core API (implements the abstract contract) ----
|
||||
|
||||
/**
|
||||
* The sole token-pressure gate: estimate the current surface-derived history,
|
||||
* and if it exceeds the threshold (`contextWindow * thresholdRatio`), compact
|
||||
* the oldest surface nodes outside the `retainTokens` budget. The auto-
|
||||
* compaction listener delegates here rather than pre-checking, so this is the
|
||||
* only place the decision lives.
|
||||
*
|
||||
* Retention is a UNIFORM tail→head walk over the whole surface — turn
|
||||
* boundaries play NO role. Walking node-by-node from the tail and summing
|
||||
* token estimates, once the retained total reaches `retainTokens` the cutoff
|
||||
* is rounded to a balanced tool-pairing boundary: if the cut before the
|
||||
* retained node is unbalanced (an unanswered tool-call sits before it — i.e.
|
||||
* it is mid-step), the walk continues head-ward until the cut is balanced so
|
||||
* the whole step is retained (never splitting a step's tool-calls from their
|
||||
* results); if it stopped on a free node (a node belonging to no step), that
|
||||
* cut is already balanced. This always rounds toward retaining MORE (retained
|
||||
* ≥ `retainTokens`) and is boundary-safe by construction — no separate snap
|
||||
* pass.
|
||||
*
|
||||
* The compacted range is always anchored at the surface HEAD (`nodes[0]`):
|
||||
* auto-compaction re-consolidates any prior head checkpoint into one fresh
|
||||
* checkpoint. Declines (`null`) when nothing is over threshold, when the whole
|
||||
* surface fits the retain budget, or when no balanced cutoff exists in the
|
||||
* compactable range (its only content is an open tail step — retry once it
|
||||
* closes).
|
||||
*/
|
||||
override async compactIfNeeded(
|
||||
agent: Agent,
|
||||
turn: number,
|
||||
step: number,
|
||||
fullSystemPrompt: string,
|
||||
signal: AbortSignal,
|
||||
): Promise<CompactionResult | null> {
|
||||
const session = agent.session
|
||||
const threshold = Math.floor(this.config.contextWindow * this.config.thresholdRatio)
|
||||
let result: CompactionResult | null = null
|
||||
for (let attempt = 0; attempt <= this.config.compactionRetries; attempt++) {
|
||||
const totalTokens = this.estimateTokens(session.deriveMessages(), fullSystemPrompt)
|
||||
if (totalTokens < threshold) return result
|
||||
|
||||
const range = this._compactableRange(session)
|
||||
if (range === null) {
|
||||
/* v8 ignore else -- defensive for non-standard subclass mutations; the concrete replace keeps a compactable head checkpoint. */
|
||||
if (result === null) return null
|
||||
/* v8 ignore next -- paired with the ignored defensive branch above. */
|
||||
break
|
||||
}
|
||||
|
||||
result = await this.compactRegion(session, range.start, range.end, agent, turn, step, signal)
|
||||
}
|
||||
|
||||
const totalTokens = this.estimateTokens(session.deriveMessages(), fullSystemPrompt)
|
||||
if (totalTokens < threshold) return result
|
||||
|
||||
throw new Error(
|
||||
`compaction still above threshold after ${this.config.compactionRetries + 1} compaction attempts `
|
||||
+ `(${totalTokens} estimated tokens >= threshold ${threshold})`,
|
||||
)
|
||||
}
|
||||
|
||||
override async compactRegion(
|
||||
session: Session,
|
||||
start: number,
|
||||
end: number,
|
||||
agent: Agent,
|
||||
turn: number,
|
||||
step: number,
|
||||
signal?: AbortSignal,
|
||||
): Promise<CompactionResult> {
|
||||
// Resolve the range by surface POSITION, not numeric seq interval. A prior
|
||||
// replace lands a fresh high-seq summary node AT the shadowed range's
|
||||
// position, so the surface order (head→tail) no longer tracks seq order —
|
||||
// `[newSummarySeq, olderRetainedSeq, …]` is normal. Indexing into the
|
||||
// ordered node list and slicing it is the only correct way to read a range;
|
||||
// a `node.seq >= start && node.seq <= end` interval test would mis-collect
|
||||
// nodes (and `start > end` would falsely reject) once that happens.
|
||||
const nodes = session.surface.nodes
|
||||
const startIdx = nodes.findIndex(n => n.seq === start)
|
||||
const endIdx = nodes.findIndex(n => n.seq === end)
|
||||
if (startIdx === -1) throw new Error(`compactRegion: start seq ${start} not found in surface`)
|
||||
if (endIdx === -1) throw new Error(`compactRegion: end seq ${end} not found in surface`)
|
||||
if (startIdx > endIdx) {
|
||||
throw new Error(`compactRegion: start seq ${start} (position ${startIdx}) is after end seq ${end} (position ${endIdx}) on the surface`)
|
||||
}
|
||||
|
||||
// The region must never split a step's assistant-message tool-calls from
|
||||
// their tool/results (which would orphan one side and produce a transcript
|
||||
// every provider rejects). A region is safe iff BOTH its edges are balanced
|
||||
// cuts: the cut before `start`, and the cut after `end`. A node that belongs
|
||||
// to no step (pre-step user message, inter-step steering, injection context)
|
||||
// is a balanced (free) boundary; an `end` inside an open (unclosed) tail step
|
||||
// leaves the cut after it unbalanced (the open tool-call has no result yet),
|
||||
// so it is rejected. See dsh-session's tool-pairing balance check.
|
||||
const events = session.events
|
||||
if (!isToolPairingBalanced(nodes, events, start)) {
|
||||
throw new Error(`compactRegion: start seq ${start} is not a balanced boundary (would split a step's tool-call/result pair)`)
|
||||
}
|
||||
// The cut after `end` is named by `end`'s surface successor, or `null` when
|
||||
// `end` is the tail.
|
||||
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
|
||||
const afterEnd: number | null = nodes[endIdx]!.next
|
||||
if (!isToolPairingBalanced(nodes, events, afterEnd)) {
|
||||
throw new Error(`compactRegion: end seq ${end} is not a balanced boundary (would split a step, or the step is still open)`)
|
||||
}
|
||||
|
||||
if (this._isCompactionInProgress(session)) {
|
||||
throw new Error('compaction already in progress')
|
||||
}
|
||||
|
||||
// Compaction's events (compact/* and the replacement user/message) must be
|
||||
// turn-enclosed: the session-log contract rejects any plugin event appended
|
||||
// outside an open turn. Auto-compaction satisfies this — it runs on the
|
||||
// `agent/pre-step` seam, after `turn/start` and before `step/start`, so
|
||||
// strictly inside the open turn (but outside any step). A manual call on a
|
||||
// fully-closed session has no turn to enclose the events, so reject rather
|
||||
// than emit an un-enclosed run.
|
||||
const openTurn = this._openTurn(session)
|
||||
if (openTurn === null) {
|
||||
throw new Error('compactRegion: no open turn — compaction events must be enclosed in a turn')
|
||||
}
|
||||
// Slice the ordered surface nodes [startIdx, endIdx] inclusive — the
|
||||
// shadowed range is positional, so this is the set the replace op covers.
|
||||
const shadowedSeqs = nodes.slice(startIdx, endIdx + 1).map(n => n.seq)
|
||||
|
||||
// --- Acquire lock ---
|
||||
const startEvent = session.append('compact/start', { turn: openTurn })
|
||||
|
||||
try {
|
||||
// --- Extract text and summarize ---
|
||||
const text = this._extractText(session, shadowedSeqs)
|
||||
const summary = await this.summarize(text, agent, turn, step, signal)
|
||||
|
||||
// Estimate token count of the shadowed content for provenance.
|
||||
let shadowedTokenCount = 0
|
||||
for (const seq of shadowedSeqs) {
|
||||
// seq comes from a surface node — always a valid log index by construction.
|
||||
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
|
||||
shadowedTokenCount += this.estimateEventTokens(session.events[seq]!)
|
||||
}
|
||||
const framedSummary = this._frameSummary(summary)
|
||||
const framedSummaryTokenCount = this.estimateContentTokens(framedSummary)
|
||||
if (framedSummaryTokenCount >= shadowedTokenCount) {
|
||||
throw new Error(
|
||||
`summary is not smaller than the shadowed content (${framedSummaryTokenCount} estimated framed tokens >= ${shadowedTokenCount})`,
|
||||
)
|
||||
}
|
||||
// --- Provenance record (log-only) ---
|
||||
const summaryEvent = session.append('compact/summary', {
|
||||
summary,
|
||||
shadowedRange: { start, end },
|
||||
shadowedSeqs,
|
||||
shadowedTokenCount,
|
||||
})
|
||||
|
||||
// --- Surface replacement ---
|
||||
// The user/message directly shadows all compacted surface nodes with a
|
||||
// single replace op. It is the ONLY surface event in the compaction
|
||||
// sequence — compact/start, compact/summary, and compact/end are log-only
|
||||
// (surfaceOp is rejected by the compiler for non-SurfaceEventType).
|
||||
// The landed content is FRAMED (checkpoint preamble + tag-wrapped summary);
|
||||
// the compact/summary provenance event above holds the raw model output.
|
||||
session.append('user/message', {
|
||||
content: framedSummary,
|
||||
source: { kind: 'plugin', plugin: 'compact' },
|
||||
}, {
|
||||
surfaceOp: { op: 'replace', start, end },
|
||||
sourceEventSeqs: [startEvent.seq, summaryEvent.seq, ...shadowedSeqs],
|
||||
})
|
||||
|
||||
// --- Release lock (log-only) ---
|
||||
// Appended LAST so the lock brackets the WHOLE operation: a crash between
|
||||
// compact/start and here leaves a detectable orphaned lock (a compact/start
|
||||
// with no matching compact/end) rather than a compact/end that falsely
|
||||
// claims compaction finished before the surface replacement landed.
|
||||
const endEvent = session.append('compact/end', { turn: openTurn })
|
||||
|
||||
return {
|
||||
startSeq: startEvent.seq,
|
||||
summarySeq: summaryEvent.seq,
|
||||
endSeq: endEvent.seq,
|
||||
summary,
|
||||
shadowedRange: { start, end },
|
||||
shadowedSeqs,
|
||||
shadowedTokenCount,
|
||||
}
|
||||
} catch (error: unknown) {
|
||||
// Always release the lock — append compact/end with the error so a
|
||||
// wedged lock is impossible.
|
||||
const msg = error instanceof Error ? error.message : String(error)
|
||||
session.append('compact/end', { turn: openTurn, error: msg })
|
||||
throw error
|
||||
}
|
||||
}
|
||||
|
||||
// ---- Internal helpers ----
|
||||
|
||||
/**
|
||||
* Frame the raw summary blocks into the content that lands on the surface:
|
||||
* a checkpoint preamble (so a resuming model reads it as a checkpoint, not a
|
||||
* fresh user request) followed by the summary wrapped in
|
||||
* {@link SUMMARY_OPEN_TAG}/{@link SUMMARY_CLOSE_TAG}. The tags make a prior
|
||||
* checkpoint detectable in the transcript on the next compaction cycle, which
|
||||
* triggers the merge rule in the summarization prompt. The raw, unframed
|
||||
* `summary` is preserved separately on the `compact/summary` provenance event.
|
||||
*/
|
||||
private _frameSummary(summary: readonly ContentBlock[]): ContentBlock[] {
|
||||
return [
|
||||
{ type: 'text', text: `${CHECKPOINT_PREAMBLE}\n\n${SUMMARY_OPEN_TAG}` },
|
||||
...summary,
|
||||
{ type: 'text', text: SUMMARY_CLOSE_TAG },
|
||||
]
|
||||
}
|
||||
|
||||
/**
|
||||
* Whether a compaction is currently in progress for `session` — an unmatched
|
||||
* `compact/start` (no later `compact/end`) WITHIN the current turn.
|
||||
*
|
||||
* The scan is scoped to the current turn: walking back from the tail it stops
|
||||
* at the first `turn/end` (the boundary closing the prior turn). A
|
||||
* `compact/start` left orphaned by a crash mid-compaction lives in a turn that
|
||||
* persistence repair then closes with a synthetic `turn/end`; scoping here so
|
||||
* that a stale orphan from a PAST turn cannot wedge compaction forever (it sits
|
||||
* before the nearest `turn/end`, so the scan never reaches it). An in-progress
|
||||
* compaction's `compact/start` is always in the still-open current turn,
|
||||
* before any `turn/end`, so it is still detected.
|
||||
*/
|
||||
private _isCompactionInProgress(session: Session): boolean {
|
||||
const events = session.events
|
||||
for (let i = events.length - 1; i >= 0; i--) {
|
||||
// Index bounded by i >= 0 and i < events.length — never undefined.
|
||||
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
|
||||
const e = events[i]!
|
||||
if (e.type === 'compact/start') return true
|
||||
if (e.type === 'compact/end') break
|
||||
// A turn/end bounds the scan: anything before it belongs to a prior
|
||||
// (closed) turn and cannot be an in-progress compaction of THIS turn.
|
||||
if (e.type === 'turn/end') break
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
/** Resolve the next head-anchored compactable surface range, or `null`. */
|
||||
private _compactableRange(session: Session): { start: number; end: number } | null {
|
||||
const nodes = session.surface.nodes
|
||||
if (nodes.length === 0) return null
|
||||
|
||||
const events = session.events
|
||||
const retainBudget = this.config.retainTokens
|
||||
|
||||
// Walk tail→head summing per-node token estimates. `keepFromIdx` is the
|
||||
// index of the OLDEST node we retain verbatim; everything strictly older
|
||||
// (`[0, keepFromIdx - 1]`) is the compactable range.
|
||||
let accumulated = 0
|
||||
let keepFromIdx = nodes.length // nothing retained yet
|
||||
for (let i = nodes.length - 1; i >= 0; i--) {
|
||||
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
|
||||
const node = nodes[i]!
|
||||
const event = events[node.seq]
|
||||
/* v8 ignore next -- node.seq is a surface-node seq, always a valid log index by construction */
|
||||
if (event) accumulated += this.estimateEventTokens(event)
|
||||
keepFromIdx = i
|
||||
if (accumulated >= retainBudget) break
|
||||
}
|
||||
|
||||
// The whole surface fits the retain budget — nothing to compact.
|
||||
if (keepFromIdx === 0) return null
|
||||
|
||||
// Round the cutoff to a tool-pairing boundary: if the cut before
|
||||
// `nodes[keepFromIdx]` is unbalanced (an unanswered tool-call sits before
|
||||
// it — i.e. it is mid-step), extend the retained side head-ward until the
|
||||
// cut is balanced, so the compacted range ends without splitting an
|
||||
// assistant↔result pair. A node that belongs to no step is already a
|
||||
// balanced (free) boundary. Decline if no balanced cut exists at or below
|
||||
// `keepFromIdx` (the compactable range is only an un-splittable open tail
|
||||
// step — retry once it closes).
|
||||
while (keepFromIdx > 0) {
|
||||
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
|
||||
if (isToolPairingBalanced(nodes, events, nodes[keepFromIdx]!.seq)) break
|
||||
keepFromIdx -= 1
|
||||
}
|
||||
if (keepFromIdx === 0) return null
|
||||
|
||||
// The compacted range is [head … keepFromIdx - 1], anchored at the head.
|
||||
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
|
||||
const firstSeq = nodes[0]!.seq
|
||||
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
|
||||
const cutoffSeq = nodes[keepFromIdx - 1]!.seq
|
||||
return { start: firstSeq, end: cutoffSeq }
|
||||
}
|
||||
|
||||
/**
|
||||
* Keep ONLY text blocks from the model-produced summary before storing it.
|
||||
*
|
||||
* The summary lands on the surface as a synthesized `user/message` (see
|
||||
* {@link _frameSummary}), so the only block type that is both useful and safe
|
||||
* there is `text`. A model assistant message can otherwise carry `reasoning`
|
||||
* (private chain-of-thought, must not leak into the durable checkpoint) and
|
||||
* `tool-call` blocks — and a surviving `tool-call` in a user message would be
|
||||
* an orphaned call with no matching `tool-result`, exactly the tool-pairing
|
||||
* breakage compaction works to avoid. Filtering to text drops both.
|
||||
*/
|
||||
private _textOnly(blocks: readonly ContentBlock[]): ContentBlock[] {
|
||||
return blocks.filter((block): block is Extract<ContentBlock, { type: 'text' }> => block.type === 'text')
|
||||
}
|
||||
|
||||
/**
|
||||
* The turn number of the currently OPEN turn — a `turn/start` not yet
|
||||
* followed by its `turn/end` — or `null` if the session has no open turn.
|
||||
*
|
||||
* Compaction's events must be enclosed in a turn, so scanning back from the
|
||||
* tail: a `turn/start` means that turn is open (return it); a `turn/end` means
|
||||
* the most recent turn already closed (return null). The whole compaction
|
||||
* sequence (compact/start … compact/end) is stamped with this turn.
|
||||
*/
|
||||
private _openTurn(session: Session): number | null {
|
||||
for (let i = session.events.length - 1; i >= 0; i--) {
|
||||
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
|
||||
const e = session.events[i]!
|
||||
if (e.type === 'turn/start') return e.data.turn
|
||||
if (e.type === 'turn/end') return null
|
||||
}
|
||||
return null
|
||||
}
|
||||
|
||||
/**
|
||||
* Extract plain-text conversation from a set of surface node seqs, for
|
||||
* feeding into the summarization model. Walks the seqs in the order given
|
||||
* (surface order, as `compactRegion` slices the surface-node list) so the
|
||||
* summary follows the conversation as the model sees it — which, after a
|
||||
* `replace`, is NOT ascending log-seq order (a high-seq summary node heads the
|
||||
* surface before older retained lower-seq nodes).
|
||||
*/
|
||||
private _extractText(session: Session, seqs: number[]): string {
|
||||
const lines: string[] = []
|
||||
|
||||
// Walk seqs in the order given (surface order, as compactRegion slices the
|
||||
// surface-node list) — NOT ascending log-seq order. After a replace the
|
||||
// summary node carries a fresh high seq while sitting at the head of the
|
||||
// surface before older retained lower-seq nodes, so a log-order scan would
|
||||
// feed the transcript out of order and break the checkpoint-merge prompt.
|
||||
for (const seq of seqs) {
|
||||
const event = session.events[seq]
|
||||
/* v8 ignore next -- seq is a surface-node seq, always a valid log index by construction */
|
||||
if (!event) continue
|
||||
|
||||
switch (event.type) {
|
||||
case 'user/message': {
|
||||
const text = this._blocksToText(event.data.content)
|
||||
if (text) lines.push(`User: ${text}`)
|
||||
break
|
||||
}
|
||||
case 'assistant/message': {
|
||||
const text = this._blocksToText(event.data.content)
|
||||
if (text) lines.push(`Assistant: ${text}`)
|
||||
break
|
||||
}
|
||||
case 'tool/result': {
|
||||
const text = this._blocksToText(event.data.content)
|
||||
const label = event.data.isError ? 'Tool error' : 'Tool result'
|
||||
if (text) lines.push(`${label} (call ${event.data.callId}): ${text}`)
|
||||
break
|
||||
}
|
||||
case 'context/message': {
|
||||
const text = this._blocksToText(event.data.content)
|
||||
if (text) lines.push(`[Context: ${text}]`)
|
||||
break
|
||||
}
|
||||
case 'steering/message': {
|
||||
const text = this._blocksToText(event.data.content)
|
||||
if (text) lines.push(`[Steering: ${text}]`)
|
||||
break
|
||||
}
|
||||
// SessionEventMap is merge-extensible — unknown types are
|
||||
// non-message events that carry no extractable text.
|
||||
/* v8 ignore next 2 -- seqs only name surface nodes, always one of the 5 handled SurfaceEventTypes; unreachable */
|
||||
default:
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
return lines.join('\n\n')
|
||||
}
|
||||
|
||||
/**
|
||||
* Render content blocks to a single plain-text string for the summarization
|
||||
* prompt. Text and reasoning contribute their text; every other block type
|
||||
* contributes a type-tagged placeholder (`[image]`, `[tool-call: name(args)]`,
|
||||
* …) so the summarizer is told what non-text content existed in the region
|
||||
* rather than silently losing it. Blocks join with newlines; empty-text
|
||||
* blocks contribute nothing.
|
||||
*/
|
||||
private _blocksToText(blocks: readonly ContentBlock[]): string {
|
||||
const parts: string[] = []
|
||||
for (const block of blocks) {
|
||||
switch (block.type) {
|
||||
case 'text':
|
||||
if (block.text) parts.push(block.text)
|
||||
break
|
||||
case 'reasoning':
|
||||
if (block.text) parts.push(`[reasoning: ${block.text}]`)
|
||||
break
|
||||
case 'tool-call':
|
||||
parts.push(`[tool-call: ${block.name}(${block.arguments})]`)
|
||||
break
|
||||
case 'tool-result': {
|
||||
const inner = this._blocksToText(block.content)
|
||||
parts.push(inner ? `[tool-result: ${inner}]` : '[tool-result]')
|
||||
break
|
||||
}
|
||||
case 'image':
|
||||
parts.push('[image]')
|
||||
break
|
||||
// ContentBlockMap is merge-extensible — render an unknown block as a
|
||||
// bare type-tagged placeholder so a plugin-added block type is still
|
||||
// signalled to the summarizer rather than dropped.
|
||||
default:
|
||||
parts.push(`[${(block as ContentBlock).type}]`)
|
||||
}
|
||||
}
|
||||
return parts.join('\n')
|
||||
}
|
||||
}
|
||||
|
||||
export default BasicCompactService
|
||||
@@ -0,0 +1,81 @@
|
||||
/**
|
||||
* Configuration vocabulary for the basic compaction backend.
|
||||
*
|
||||
* Every tunable lives here, in the implementation — the abstract contract
|
||||
* (`@deepseek-ai/dsh-compact`) carries no config, because thresholds and
|
||||
* retention policy are HOW decisions a different backend would make
|
||||
* differently.
|
||||
*
|
||||
* @module @deepseek-ai/dsh-compact-basic/types
|
||||
*/
|
||||
|
||||
/**
|
||||
* Backend configuration. Every knob is REQUIRED except `auto`: there is no
|
||||
* concrete data yet to justify default thresholds/budgets, so a consumer must
|
||||
* state each value explicitly rather than inherit a guessed default. `auto`
|
||||
* alone defaults to `true` (auto-compaction is the intended posture).
|
||||
*/
|
||||
export interface BasicCompactConfig {
|
||||
/** Context window size in tokens. */
|
||||
contextWindow: number
|
||||
/** Compact when estimated token usage exceeds this fraction of context window. */
|
||||
thresholdRatio: number
|
||||
/** Number of tokens of recent context to retain during compaction. */
|
||||
retainTokens: number
|
||||
/** Model to use for summarization (`''` — uses the agent's model). */
|
||||
summarizationModel: string
|
||||
/** Provider generation cap for the summarization call. */
|
||||
maxTokens: number
|
||||
/** Extra compaction attempts when the first compacted surface is still over threshold. */
|
||||
compactionRetries: number
|
||||
/** Enable automatic compaction on the `agent/pre-step` seam (default true). */
|
||||
auto?: boolean
|
||||
}
|
||||
|
||||
/** Resolved config with `auto` defaulted. */
|
||||
export type ResolvedConfig = Required<BasicCompactConfig>
|
||||
|
||||
/**
|
||||
* Default `auto` when unset and reject nonsensical numeric knobs.
|
||||
*
|
||||
* Convergence is not a static config invariant: provider generation caps can be
|
||||
* spent on hidden or surfaced reasoning tokens, and the model may emit a summary
|
||||
* of unpredictable size. The backend instead enforces convergence dynamically:
|
||||
* each committed summary must be smaller than the content it shadows, and
|
||||
* `compactIfNeeded` may re-compact up to `compactionRetries` extra times before
|
||||
* throwing if the surface still exceeds the threshold.
|
||||
*/
|
||||
export function resolveConfig(config: BasicCompactConfig): ResolvedConfig {
|
||||
const resolved: ResolvedConfig = { auto: true, ...config }
|
||||
|
||||
assertPositiveInteger('contextWindow', resolved.contextWindow)
|
||||
assertRatio('thresholdRatio', resolved.thresholdRatio)
|
||||
assertNonNegativeInteger('retainTokens', resolved.retainTokens)
|
||||
assertPositiveInteger('maxTokens', resolved.maxTokens)
|
||||
assertNonNegativeInteger('compactionRetries', resolved.compactionRetries)
|
||||
if (typeof resolved.summarizationModel !== 'string') {
|
||||
throw new Error('BasicCompactConfig: summarizationModel must be a string.')
|
||||
}
|
||||
if (typeof resolved.auto !== 'boolean') {
|
||||
throw new Error('BasicCompactConfig: auto must be a boolean.')
|
||||
}
|
||||
return resolved
|
||||
}
|
||||
|
||||
function assertPositiveInteger(name: string, value: number): void {
|
||||
if (!Number.isInteger(value) || value <= 0) {
|
||||
throw new Error(`BasicCompactConfig: ${name} (${value}) must be a positive integer.`)
|
||||
}
|
||||
}
|
||||
|
||||
function assertNonNegativeInteger(name: string, value: number): void {
|
||||
if (!Number.isInteger(value) || value < 0) {
|
||||
throw new Error(`BasicCompactConfig: ${name} (${value}) must be a non-negative integer.`)
|
||||
}
|
||||
}
|
||||
|
||||
function assertRatio(name: string, value: number): void {
|
||||
if (typeof value !== 'number' || !Number.isFinite(value) || value <= 0 || value > 1) {
|
||||
throw new Error(`BasicCompactConfig: ${name} (${value}) must be a number in (0, 1].`)
|
||||
}
|
||||
}
|
||||
File diff suppressed because it is too large
Load Diff
@@ -0,0 +1,156 @@
|
||||
import { describe, expect, it } from 'vitest'
|
||||
import { Context } from 'cordis'
|
||||
import LlmService from '@deepseek-ai/dsh-llm'
|
||||
import type { ContentBlock, GenerateOptions, StreamChunk } from '@deepseek-ai/dsh-llm'
|
||||
import { CallId, LlmAdapter } from '@deepseek-ai/dsh-llm'
|
||||
import SessionStore from '@deepseek-ai/dsh-session'
|
||||
import { isToolPairingBalanced } from '@deepseek-ai/dsh-session'
|
||||
import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
|
||||
import ToolRegistry, { defineTool } from '@deepseek-ai/dsh-tools'
|
||||
import AgentRegistry, { AgentId } from '@deepseek-ai/dsh-agent'
|
||||
import AgentLoop, { ReactLoopAgent } from '@deepseek-ai/dsh-agent-loop'
|
||||
import * as Invariants from '@deepseek-ai/dsh-invariants'
|
||||
import { BasicCompactService } from '@deepseek-ai/dsh-compact-basic'
|
||||
import type { SurfaceEvent } from '@deepseek-ai/dsh-session'
|
||||
|
||||
/**
|
||||
* CBR-001 regression: a compaction checkpoint that the REAL loop lands is a
|
||||
* free surface boundary (it carries no tool-call/result pair), so it must be a
|
||||
* valid region edge on BOTH sides. A surface-anchored balance check sees that;
|
||||
* the abandoned log-position scan did not.
|
||||
*
|
||||
* The loop fires the compaction seam mid-flight, so the landed checkpoint
|
||||
* `user/message{replace}` sits at a HIGH log seq positioned beside the current
|
||||
* step even though its SURFACE position is the head. A log-position forward scan
|
||||
* from the checkpoint reaches the step's own later `assistant/message` and
|
||||
* wrongly reports the checkpoint as mid-step — refusing it as a region end. A
|
||||
* SECOND compaction that re-summarizes just that head checkpoint (region end ==
|
||||
* checkpoint) therefore throws and is swallowed, so the surface never
|
||||
* re-consolidates.
|
||||
*
|
||||
* This drives a real auto-compaction through the agent-loop and asserts the
|
||||
* landed checkpoint balances on both sides AND that re-compacting it (end ==
|
||||
* checkpoint) succeeds. RED on the log-position predicates; GREEN once alignment
|
||||
* is decided from surface tool-pairing balance.
|
||||
*/
|
||||
|
||||
const TOKENS_PER_BLOCK = 10
|
||||
|
||||
class ReproCompactService extends BasicCompactService {
|
||||
override estimateContentTokens(blocks: readonly ContentBlock[]): number {
|
||||
return blocks.length * TOKENS_PER_BLOCK
|
||||
}
|
||||
|
||||
override async summarize(): Promise<ContentBlock[]> {
|
||||
return [{ type: 'text', text: 'CHECKPOINT SUMMARY' }]
|
||||
}
|
||||
}
|
||||
|
||||
/** Each call emits one tool-call until exhausted, then a final text answer. */
|
||||
class StepwiseToolAdapter extends LlmAdapter {
|
||||
calls = 0
|
||||
constructor(private toolSteps: number) {
|
||||
super()
|
||||
}
|
||||
|
||||
async * stream(_options: GenerateOptions): AsyncIterable<StreamChunk> {
|
||||
const n = this.calls
|
||||
this.calls += 1
|
||||
if (n < this.toolSteps) {
|
||||
const id = CallId(`c${n}`)
|
||||
const args = `{"i":${n}}`
|
||||
yield { type: 'block-start', index: 0, blockType: 'text' }
|
||||
yield { type: 'block-end', index: 0, block: { type: 'text', text: `step ${n}` } }
|
||||
yield { type: 'block-start', index: 1, blockType: 'tool-call' }
|
||||
yield { type: 'block-end', index: 1, block: { type: 'tool-call', id, name: 'work', arguments: args } }
|
||||
yield { type: 'finish', reason: { kind: 'tool-calls' } }
|
||||
return
|
||||
}
|
||||
yield { type: 'block-start', index: 0, blockType: 'text' }
|
||||
yield { type: 'block-end', index: 0, block: { type: 'text', text: 'all done' } }
|
||||
yield { type: 'finish', reason: { kind: 'stop' } }
|
||||
}
|
||||
}
|
||||
|
||||
async function harness(toolSteps: number): Promise<{ ctx: Context; compact: ReproCompactService }> {
|
||||
const ctx = new Context()
|
||||
await ctx.plugin(LlmService)
|
||||
await ctx.plugin(SessionStore)
|
||||
await ctx.plugin(Invariants, {})
|
||||
await ctx.plugin(SystemPrompt)
|
||||
await ctx.plugin(ToolRegistry)
|
||||
await ctx.plugin(AgentRegistry)
|
||||
await ctx.plugin(AgentLoop, { agents: [] })
|
||||
ctx.llm.registerAdapter(['mock'], new StepwiseToolAdapter(toolSteps))
|
||||
ctx.tools.register(defineTool({
|
||||
name: 'work',
|
||||
description: 'does work',
|
||||
parameters: { i: { type: 'number' } },
|
||||
async execute() {
|
||||
return [{ type: 'text', text: 'work result' }]
|
||||
},
|
||||
}))
|
||||
// Tiny window so a couple of tool steps cross the threshold and compaction
|
||||
// fires within the runaway turn.
|
||||
const compact = new ReproCompactService(ctx, {
|
||||
auto: true,
|
||||
contextWindow: 64,
|
||||
thresholdRatio: 0.5,
|
||||
retainTokens: 20,
|
||||
summarizationModel: '',
|
||||
maxTokens: 8192,
|
||||
compactionRetries: 1,
|
||||
})
|
||||
return { ctx, compact }
|
||||
}
|
||||
|
||||
function waitForIdle(ctx: Context, agent: ReactLoopAgent): Promise<void> {
|
||||
return new Promise((resolve) => {
|
||||
const dispose = ctx.on('agent/status', (subject, status) => {
|
||||
if (subject === agent && status === 'idle') {
|
||||
dispose()
|
||||
resolve()
|
||||
}
|
||||
})
|
||||
})
|
||||
}
|
||||
|
||||
describe('CBR-001: a real-loop checkpoint is a valid boundary on both sides', () => {
|
||||
it('the head checkpoint the loop lands is a balanced cut on both sides', async () => {
|
||||
const { ctx } = await harness(8)
|
||||
try {
|
||||
const agent = ctx.agentLoop.create(AgentId('repro'), { model: 'mock' })
|
||||
agent.send([{ type: 'text', text: 'do a long multi-step task' }])
|
||||
await waitForIdle(ctx, agent)
|
||||
|
||||
const events = [...agent.session.events]
|
||||
// A compaction ran: at least one checkpoint landed on the surface.
|
||||
const checkpoints = events.filter(
|
||||
(e): e is SurfaceEvent =>
|
||||
e.type === 'user/message'
|
||||
&& typeof (e as SurfaceEvent).surfaceOp === 'object',
|
||||
)
|
||||
expect(checkpoints.length).toBeGreaterThan(0)
|
||||
|
||||
// The loop fired compaction mid-flight, so each landed checkpoint sits at a
|
||||
// high log seq beside the step it landed in, even though its SURFACE
|
||||
// position is the head of the range it shadowed. A checkpoint carries no
|
||||
// tool-call/result pair (only summarized prose), so every checkpoint still
|
||||
// on the surface must be a balanced cut on BOTH sides — the cut before it
|
||||
// (region START) and the cut after it (region END). The abandoned
|
||||
// log-position scan reported the END as mis-aligned because the forward log
|
||||
// scan reached the neighbouring step's assistant/message.
|
||||
const nodes = agent.session.surface.nodes
|
||||
for (const cp of checkpoints) {
|
||||
const node = nodes.find(n => n.seq === cp.seq)
|
||||
if (!node) continue // shadowed by a later checkpoint — no longer an edge.
|
||||
expect(isToolPairingBalanced(nodes, events, node.seq),
|
||||
`checkpoint seq ${node.seq} must be a balanced region START`).toBe(true)
|
||||
expect(isToolPairingBalanced(nodes, events, node.next),
|
||||
`checkpoint seq ${node.seq} must be a balanced region END`).toBe(true)
|
||||
}
|
||||
} finally {
|
||||
await ctx.fiber.dispose()
|
||||
}
|
||||
})
|
||||
})
|
||||
@@ -0,0 +1,16 @@
|
||||
{
|
||||
"extends": "../../../tsconfig.base.json",
|
||||
"compilerOptions": {
|
||||
"rootDir": "src",
|
||||
"outDir": "lib/types"
|
||||
},
|
||||
"include": ["src"],
|
||||
"references": [
|
||||
{ "path": "../../../vendor/cosmokit" },
|
||||
{ "path": "../../../vendor/cordis" },
|
||||
{ "path": "../../llm/llm" },
|
||||
{ "path": "../../core/session" },
|
||||
{ "path": "../../core/agent" },
|
||||
{ "path": "../compact" }
|
||||
]
|
||||
}
|
||||
@@ -10,7 +10,7 @@ This package is the interface tier of the compaction capability, split so each c
|
||||
| `@deepseek-ai/dsh-compact-basic` (deferred) | a backend: char/4 estimation + token-budget retention + `llm.stream()` summarization |
|
||||
| `@deepseek-ai/dsh-tool-compact` (deferred) | the model-facing `/compact` tool over `ctx.compact` |
|
||||
|
||||
Unlike the bash seam, this interface depends on `@deepseek-ai/dsh-session` and `@deepseek-ai/dsh-llm` — the contract's verbs are defined over a `Session` and its output is the `ContentBlock` vocabulary, so they cannot be expressed without naming those packages. That deviation from the "interface depends only on cordis" guidance is intentional and recorded in the [compaction capability-seam RFC](../../../docs/rfc/proposed/feature/2026-06-18-compaction-capability-seam.md).
|
||||
Unlike the bash seam, this interface depends on `@deepseek-ai/dsh-session` and `@deepseek-ai/dsh-llm` — the contract's verbs are defined over a `Session` and its output is the `ContentBlock` vocabulary, so they cannot be expressed without naming those packages. That deviation from the "interface depends only on cordis" guidance is intentional and recorded in the [compaction capability-seam RFC](../../../docs/rfc/implemented/feature/2026-06-18-compaction-capability-seam.md).
|
||||
|
||||
## Service API (`ctx.compact`)
|
||||
|
||||
@@ -18,10 +18,10 @@ Both methods are **abstract** — the backend owns the entire strategy (token es
|
||||
|
||||
| Member | Semantics |
|
||||
|---|---|
|
||||
| `compactIfNeeded(session, systemPrompt?, model?, signal?)` | Estimate the history size; if over the backend's threshold, compact an older range via `compactRegion`, keeping recent context intact. Returns the `CompactionResult`, or `null` if nothing needed compacting. |
|
||||
| `compactRegion(session, start, end, model, signal?)` | Forcibly summarize surface nodes `[start, end]` (inclusive seqs) into a single replacement node. **Throws** if a compaction is already in progress, if `start`/`end` aren't surface nodes, or if `start > end`. |
|
||||
| `compactIfNeeded(agent, turn, step, fullSystemPrompt, signal)` | Estimate the surface-derived history size; if over the backend's threshold, compact an older range via `compactRegion`, keeping recent context intact. Returns the `CompactionResult`, or `null` if nothing needed compacting. All parameters required — the loop's `agent/pre-step` checkpoint supplies the agent, lifecycle context, assembled `fullSystemPrompt`, and turn `signal`; router-aware summarizers can use the agent lifecycle context to route their own model call through `agent/request`. |
|
||||
| `compactRegion(session, start, end, agent, turn, step, signal?)` | Forcibly summarize surface nodes `[start, end]` (inclusive seqs) into a single replacement node. **Throws** if a compaction is already in progress, if `start`/`end` aren't surface nodes, or if `start` is positioned after `end` on the surface. The range is a SURFACE-POSITION span, not a numeric seq interval — after a prior replace lands a fresh high-seq summary node at the shadowed range's position, surface order no longer tracks seq order. |
|
||||
|
||||
Both methods take an optional `signal: AbortSignal`. A backend that summarizes via `ctx.llm.stream()` **must** forward it into the call's `GenerateOptions.signal`, so an abort or fiber dispose tears down the in-flight summarization instead of leaving an orphaned model call running past the cancellation. The turn that the `compact/*` events belong to is not a parameter — it is recoverable from the log (the currently-open turn), so the backend stamps it without the caller supplying it.
|
||||
`compactIfNeeded` takes a required `signal`; `compactRegion`'s is optional. A backend that summarizes via `ctx.llm.stream()` **must** forward it into the call's `GenerateOptions.signal`, so an abort or fiber dispose tears down the in-flight summarization instead of leaving an orphaned model call running past the cancellation. The session being compacted comes from the agent context; the turn that the `compact/*` events belong to is recoverable from the log (the currently-open turn), so the backend stamps it from the log rather than trusting a caller-supplied value.
|
||||
|
||||
## Surface contract
|
||||
|
||||
|
||||
@@ -16,7 +16,7 @@
|
||||
* depends on `dsh-session` and `dsh-llm`: the contract's verbs are defined over
|
||||
* a `Session` and its output is the `ContentBlock` vocabulary. That deviation
|
||||
* from the "interface depends only on cordis" guidance is intentional and
|
||||
* recorded in the [compaction capability-seam RFC](../../../../docs/rfc/proposed/feature/2026-06-18-compaction-capability-seam.md).
|
||||
* recorded in the [compaction capability-seam RFC](../../../../docs/rfc/implemented/feature/2026-06-18-compaction-capability-seam.md).
|
||||
*
|
||||
* @module @deepseek-ai/dsh-compact
|
||||
*/
|
||||
@@ -27,6 +27,12 @@ import type { CompactionResult } from './types.ts'
|
||||
|
||||
export type { CompactionResult } from './types.ts'
|
||||
|
||||
/** Minimal agent context compaction needs without depending on the agent package. */
|
||||
export interface CompactAgentContext {
|
||||
session: Session
|
||||
options: { model?: string }
|
||||
}
|
||||
|
||||
declare module 'cordis' {
|
||||
interface Context {
|
||||
compact: CompactService
|
||||
@@ -62,24 +68,44 @@ export abstract class CompactService extends Service {
|
||||
/**
|
||||
* Check token pressure and compact if the conversation is too large.
|
||||
*
|
||||
* Estimates the current history size (optionally including a system prompt),
|
||||
* and if it exceeds the backend's threshold, compacts an older range via
|
||||
* {@link compactRegion}, keeping recent context intact.
|
||||
* Estimates the current surface-derived history size (including the system
|
||||
* prompt), and if it exceeds the backend's threshold, compacts an older range
|
||||
* via {@link compactRegion}, keeping recent context intact. Returns `null`
|
||||
* when no compaction is needed.
|
||||
*
|
||||
* @param session - the session whose surface may be compacted.
|
||||
* @param systemPrompt - optional system prompt, counted toward the estimate.
|
||||
* @param model - optional summarization model (falls back to backend config).
|
||||
* @param signal - optional cancellation signal. A backend that summarizes via
|
||||
* Scope and guarantees a backend MUST honor:
|
||||
* - **Surface-derived history only.** The decision is made against the history
|
||||
* derived from the session surface — the only thing compaction can act on.
|
||||
* Non-surface context injected downstream (into the request `messages` by a
|
||||
* later listener) is out of this accounting by construction.
|
||||
* - **Head-anchored, best-effort.** Auto-compaction consolidates from the
|
||||
* surface HEAD up to a balanced tool-pairing cutoff, so a prior head
|
||||
* checkpoint is
|
||||
* re-summarized into one fresh checkpoint (the surface holds at most one
|
||||
* auto-generated checkpoint, always at the head). It is best-effort over
|
||||
* CLOSED steps: when the only compactable content left is an un-splittable
|
||||
* open tail step, it declines (`null`) and retries once that step closes.
|
||||
* - **Single-unit overflow is out of scope.** If a single retained unit (one
|
||||
* closed step, or a large free node such as a pasted `user/message`) ALONE
|
||||
* exceeds the budget, compaction cannot help and the call may go out
|
||||
* over-budget. Bounding an individual unit's size is a separate concern.
|
||||
*
|
||||
* @param agent - agent context owning the session surface and model options.
|
||||
* @param turn - turn number of the pre-step checkpoint.
|
||||
* @param step - step number about to start.
|
||||
* @param fullSystemPrompt - assembled system prompt, counted toward the estimate.
|
||||
* @param signal - cancellation signal. A backend summarizing via
|
||||
* `ctx.llm.stream()` MUST forward this into the call's `GenerateOptions.signal`
|
||||
* so an abort/dispose tears down the in-flight summarization rather than
|
||||
* leaving an orphaned model call running past the cancellation.
|
||||
* @returns the compaction result, or `null` if no compaction was needed.
|
||||
*/
|
||||
abstract compactIfNeeded(
|
||||
session: Session,
|
||||
systemPrompt?: string,
|
||||
model?: string,
|
||||
signal?: AbortSignal,
|
||||
agent: CompactAgentContext,
|
||||
turn: number,
|
||||
step: number,
|
||||
fullSystemPrompt: string,
|
||||
signal: AbortSignal,
|
||||
): Promise<CompactionResult | null>
|
||||
|
||||
/**
|
||||
@@ -89,22 +115,40 @@ export abstract class CompactService extends Service {
|
||||
* summarizes their content and appends a replacement surface node. Used by the
|
||||
* (future) `/compact` tool and internally by {@link compactIfNeeded}.
|
||||
*
|
||||
* The region MUST NOT split a step's `assistant/message` tool-calls from their
|
||||
* `tool/result`s, leaving the rehydrated transcript with a dangling tool-call
|
||||
* or an orphaned tool-result that every provider rejects. A region is safe iff
|
||||
* both its edges are balanced cuts on the surface: the cut before `start` and
|
||||
* the cut after `end` each have no unanswered tool-call before them. A node
|
||||
* that belongs to no step (a pre-step user message, inter-step steering, or an
|
||||
* injection context message) is a balanced (free) boundary; an `end` inside an
|
||||
* open (unclosed) tail step is invalid — its tool-calls have no results yet.
|
||||
* `dsh-session` exports `isToolPairingBalanced` for this check.
|
||||
*
|
||||
* @param session - the session whose surface is mutated.
|
||||
* @param start - inclusive seq of the first surface node to compact.
|
||||
* @param end - inclusive seq of the last surface node to compact.
|
||||
* @param model - summarization model.
|
||||
* @param agent - agent context used by router-aware summarizers.
|
||||
* @param turn - lifecycle turn forwarded to request-routing seams.
|
||||
* @param step - lifecycle step forwarded to request-routing seams.
|
||||
* @param signal - optional cancellation signal. A backend that summarizes via
|
||||
* `ctx.llm.stream()` MUST forward this into the call's `GenerateOptions.signal`
|
||||
* so an abort/dispose tears down the in-flight summarization rather than
|
||||
* leaving an orphaned model call running past the cancellation.
|
||||
* @throws if compaction is already in progress, or if `start`/`end` are not
|
||||
* valid surface nodes, or if `start > end`.
|
||||
* @throws if compaction is already in progress, if `start`/`end` are not
|
||||
* valid surface nodes, if `start` is positioned after `end` on the surface
|
||||
* (the range is a surface-POSITION span, not a numeric seq interval — a
|
||||
* prior replace can leave the surface non-monotonic in seq order), or if
|
||||
* either boundary is not a balanced tool-pairing cut (would split a step's
|
||||
* tool-call/result pair).
|
||||
*/
|
||||
abstract compactRegion(
|
||||
session: Session,
|
||||
start: number,
|
||||
end: number,
|
||||
model: string,
|
||||
agent: CompactAgentContext,
|
||||
turn: number,
|
||||
step: number,
|
||||
signal?: AbortSignal,
|
||||
): Promise<CompactionResult>
|
||||
}
|
||||
|
||||
@@ -6,7 +6,7 @@
|
||||
* events are log-only markers (lock + provenance); only the five
|
||||
* surface-eligible types can carry `surfaceOp`. The actual surface mutation is
|
||||
* performed by a separate `user/message` event carrying the summary (see the
|
||||
* [compaction capability-seam RFC](../../../../docs/rfc/proposed/feature/2026-06-18-compaction-capability-seam.md)).
|
||||
* [compaction capability-seam RFC](../../../../docs/rfc/implemented/feature/2026-06-18-compaction-capability-seam.md)).
|
||||
*
|
||||
* Configuration lives in the backend, not here: the contract states WHAT
|
||||
* compaction produces, while every tunable (context window, thresholds,
|
||||
@@ -48,9 +48,16 @@ export interface CompactionResult {
|
||||
endSeq: number
|
||||
/** The summary content blocks produced by the backend. */
|
||||
summary: ContentBlock[]
|
||||
/** The seq range that was shadowed [start, end] inclusive. */
|
||||
/**
|
||||
* The surface-boundary pair that was shadowed: the seqs of the first
|
||||
* (`start`) and last (`end`) surface nodes of the replaced range. A
|
||||
* surface-POSITION span, not a numeric seq interval — after a prior replace
|
||||
* lands a fresh high-seq summary node at an older range's position, `start`
|
||||
* can be GREATER than `end`. {@link CompactionResult.shadowedSeqs} is the
|
||||
* authoritative set of shadowed nodes, in surface order.
|
||||
*/
|
||||
shadowedRange: { start: number; end: number }
|
||||
/** The seq numbers of all shadowed surface nodes. */
|
||||
/** The seqs of all shadowed surface nodes, in surface order. */
|
||||
shadowedSeqs: number[]
|
||||
/** Estimated token count of the shadowed content. */
|
||||
shadowedTokenCount: number
|
||||
|
||||
@@ -3,6 +3,7 @@ import { Context } from 'cordis'
|
||||
import { CompactService } from '@deepseek-ai/dsh-compact'
|
||||
import type { CompactionResult } from '@deepseek-ai/dsh-compact'
|
||||
import { Session, SessionId } from '@deepseek-ai/dsh-session'
|
||||
import type { CompactAgentContext } from '@deepseek-ai/dsh-compact'
|
||||
|
||||
/**
|
||||
* A trivial concrete CompactService implementing the abstract contract. The
|
||||
@@ -15,10 +16,11 @@ class StubCompactService extends CompactService {
|
||||
lastSignal: AbortSignal | undefined
|
||||
|
||||
override async compactIfNeeded(
|
||||
_session: Session,
|
||||
_systemPrompt?: string,
|
||||
_model?: string,
|
||||
signal?: AbortSignal,
|
||||
_agent: CompactAgentContext,
|
||||
_turn: number,
|
||||
_step: number,
|
||||
_fullSystemPrompt: string,
|
||||
signal: AbortSignal,
|
||||
): Promise<CompactionResult | null> {
|
||||
this.lastSignal = signal
|
||||
return null
|
||||
@@ -28,7 +30,9 @@ class StubCompactService extends CompactService {
|
||||
session: Session,
|
||||
start: number,
|
||||
end: number,
|
||||
_model: string,
|
||||
_agent: CompactAgentContext,
|
||||
_turn: number,
|
||||
_step: number,
|
||||
signal?: AbortSignal,
|
||||
): Promise<CompactionResult> {
|
||||
this.lastSignal = signal
|
||||
@@ -54,6 +58,10 @@ class StubCompactService extends CompactService {
|
||||
}
|
||||
|
||||
describe('CompactService seam', () => {
|
||||
function stubAgent(session: Session, model?: string): CompactAgentContext {
|
||||
return { session, options: model === undefined ? {} : { model } }
|
||||
}
|
||||
|
||||
it('registers as ctx.compact', () => {
|
||||
const ctx = new Context()
|
||||
void new StubCompactService(ctx)
|
||||
@@ -72,7 +80,8 @@ describe('CompactService seam', () => {
|
||||
it('exposes the abstract contract methods', async () => {
|
||||
const ctx = new Context()
|
||||
const svc = new StubCompactService(ctx)
|
||||
expect(await svc.compactIfNeeded(new Session(SessionId('s')))).toBeNull()
|
||||
const session = new Session(SessionId('s'))
|
||||
expect(await svc.compactIfNeeded(stubAgent(session), 1, 1, '', new AbortController().signal)).toBeNull()
|
||||
})
|
||||
|
||||
it('compact/* events merge into SessionEventMap and are log-only', async () => {
|
||||
@@ -80,7 +89,7 @@ describe('CompactService seam', () => {
|
||||
const svc = new StubCompactService(ctx)
|
||||
const session = new Session(SessionId('s'))
|
||||
|
||||
const result = await svc.compactRegion(session, 0, 0, 'm')
|
||||
const result = await svc.compactRegion(session, 0, 0, stubAgent(session, 'm'), 1, 1)
|
||||
|
||||
const startEvent = session.events.find(e => e.type === 'compact/start')
|
||||
expect(startEvent).toBeDefined()
|
||||
@@ -98,10 +107,10 @@ describe('CompactService seam', () => {
|
||||
const session = new Session(SessionId('s'))
|
||||
const controller = new AbortController()
|
||||
|
||||
await svc.compactRegion(session, 0, 0, 'm', controller.signal)
|
||||
await svc.compactRegion(session, 0, 0, stubAgent(session, 'm'), 1, 1, controller.signal)
|
||||
expect(svc.lastSignal).toBe(controller.signal)
|
||||
|
||||
await svc.compactIfNeeded(session, undefined, undefined, controller.signal)
|
||||
await svc.compactIfNeeded(stubAgent(session), 1, 1, '', controller.signal)
|
||||
expect(svc.lastSignal).toBe(controller.signal)
|
||||
})
|
||||
})
|
||||
@@ -53,6 +53,8 @@ forever:
|
||||
STEP loop:
|
||||
drain steering
|
||||
assembly = systemPrompt.assemble()
|
||||
await serial agent/pre-step ⟵ surface mutation (compaction) outside the step
|
||||
session('step/start')
|
||||
request = waterfall agent/request
|
||||
stream llm.stream(request) → session('assistant/chunk')
|
||||
message = waterfall agent/step-result
|
||||
@@ -74,8 +76,8 @@ Cancellation: `agent.cancel()` is the single public stop primitive — it clears
|
||||
### What is NOT here
|
||||
|
||||
Everything that goes beyond "call the model, run the tools, repeat" belongs to plugins listening on the event taxonomy:
|
||||
- Hooks: `agent/request`, `agent/step-result`, `tools/execute`, `agent/turn-continuation`
|
||||
- Compaction: `agent/request`
|
||||
- Hooks: `agent/pre-step`, `agent/request`, `agent/step-result`, `tools/execute`, `agent/turn-continuation`
|
||||
- Compaction: `agent/pre-step`
|
||||
- Sandbox, permission, plan mode: `tools/execute`
|
||||
- Sub-agents: implemented outside the loop as `ctx.subagents` providers; in-process providers use `ctx.agents.create()` and owned `AgentHandle` teardown, while child streaming/progress and background/poll collection remain deferred.
|
||||
- Persistence: `session/event` + `session/flush`
|
||||
|
||||
@@ -12,6 +12,7 @@ import type { FinishReason, GenerateOptions, Message } from '@deepseek-ai/dsh-ll
|
||||
import { BlockAssembler, HarnessError } from '@deepseek-ai/dsh-llm'
|
||||
import type { Session, TurnEndReason, TurnTrigger } from '@deepseek-ai/dsh-session'
|
||||
import { renderPrompt } from '@deepseek-ai/dsh-system-prompt'
|
||||
import type { PromptAssembly } from '@deepseek-ai/dsh-system-prompt'
|
||||
import type {} from '@deepseek-ai/dsh-tools'
|
||||
import type { ReactLoopAgent } from './agent.ts'
|
||||
|
||||
@@ -147,10 +148,11 @@ export interface LoopHandle {
|
||||
* drain queued → 'turn/start' → session('user/message'…) → emit agent/turn-start
|
||||
* STEP loop:
|
||||
* drain steering → session('steering/message') ⟵ catches late steering
|
||||
* session('step/start'); emit agent/step-start ⟵ append before emit (the event-sourcing RFC)
|
||||
* assembly = ctx.systemPrompt.assemble() ⟵ waterfall system-prompt/assemble
|
||||
* await ctx.serial('agent/pre-step') ⟵ surface mutation (compaction) OUTSIDE the step
|
||||
* session('step/start'); emit agent/step-start ⟵ append before emit (the event-sourcing RFC)
|
||||
* req = {model, system, tools, messages: session.deriveMessages(), signal}
|
||||
* req = waterfall agent/request ⟵ hooks/compaction/model-switch
|
||||
* req = waterfall agent/request ⟵ hooks/model-switch
|
||||
* stream ctx.llm.stream(req) ⟵ waterfall llm/stream (raw chunks)
|
||||
* session('assistant/chunk'); emit agent/stream-chunk
|
||||
* msg = waterfall agent/step-result ⟵ BEFORE the log append, so the
|
||||
@@ -386,30 +388,78 @@ async function runTurn(ctx: Context, agent: ReactLoopAgent, handle: LoopHandle,
|
||||
// (or turn-start listeners on the first step) joins before the request.
|
||||
drainSteering(ctx, agent, turn)
|
||||
|
||||
// The step's AbortController exists BEFORE any async pre-step work so a
|
||||
// dispose() or cancel() — in a synchronous turn-start listener or an
|
||||
// async listener whose effect fires before we block — always has an armed
|
||||
// abort to cancel against. isDisposed below covers disposal, which does
|
||||
// NOT set the cancel marker. Cleared on every exit path below.
|
||||
const abort = new AbortController()
|
||||
handle.setAbort(abort)
|
||||
|
||||
// Assemble the system prompt for this step. Done HERE (before step/start)
|
||||
// because the pre-step seam needs it: compaction measures token pressure
|
||||
// against the system prompt (it counts toward the budget). runStep reuses
|
||||
// this same assembly for the request, so the prompt is assembled once per
|
||||
// step.
|
||||
const assembly = await ctx.systemPrompt.assemble()
|
||||
const fullSystemPrompt = [renderPrompt(assembly), agent.options.systemPrompt ?? '']
|
||||
.filter(text => text.length > 0)
|
||||
.join('\n\n')
|
||||
|
||||
// Interruption landing after assembly: dispose() or cancel() in a
|
||||
// turn-start listener (or a listener whose promise resolved before the
|
||||
// await above) arms either handle.isDisposed() or handle.isCancelled().
|
||||
// The Abort was created first, so any concurrent abort also lands on it.
|
||||
// Drop the about-to-start step WITHOUT running the seam — no step is open
|
||||
// yet, so end the turn accordingly (disposed wins for an unambiguous
|
||||
// reason).
|
||||
if (handle.isCancelled() || handle.isDisposed()) {
|
||||
handle.setAbort(undefined)
|
||||
reason = handle.isDisposed() ? { kind: 'disposed' } : { kind: 'aborted', reason: handle.cancelReason() }
|
||||
break
|
||||
}
|
||||
|
||||
// Pre-step surface-mutation checkpoint (compaction), fired OUTSIDE the
|
||||
// step: after `turn/start` (and the prior step's close) but before
|
||||
// `step/start`, so a compaction's log-only `compact/*` records and its
|
||||
// replacement node land cleanly outside any step (honest structure that
|
||||
// crash-safety relies on — a dangling `compact/start` sits before the
|
||||
// synthetic `turn/end` repair appends). Serial (awaited, in order, no
|
||||
// veto): each listener completes its surface mutation before the next, so
|
||||
// concurrent listeners cannot interleave their `session.append`s. A
|
||||
// throwing listener escapes to the outer catch, which closes the (not-yet-
|
||||
// open) step as a no-op and ends the turn via failTurn — a broken
|
||||
// pre-step plugin ends the turn, not the loop.
|
||||
await ctx.serial('agent/pre-step', agent, turn, step, fullSystemPrompt, abort.signal)
|
||||
|
||||
// Interruption landing during the pre-step seam: do not open an empty
|
||||
// step. `agent/step-start` listeners get their own check below because
|
||||
// they necessarily run after step/start is appended/emitted.
|
||||
if (handle.isCancelled() || handle.isDisposed()) {
|
||||
handle.setAbort(undefined)
|
||||
reason = handle.isDisposed() ? { kind: 'disposed' } : { kind: 'aborted', reason: handle.cancelReason() }
|
||||
break
|
||||
}
|
||||
|
||||
session.append('step/start', { turn, step })
|
||||
stepOpen = true
|
||||
ctx.emit('agent/step-start', agent, turn, step)
|
||||
|
||||
const abort = new AbortController()
|
||||
handle.setAbort(abort)
|
||||
|
||||
// Cancel landing in the step-start window: a synchronous `agent/turn-start`
|
||||
// or `agent/step-start` listener (both fire before this point) can have
|
||||
// called `cancel()`, and `runStep` would otherwise run a full extra step
|
||||
// with no AbortController having observed it. Check the marker AFTER
|
||||
// setAbort (so the next-iteration drain sees a clean controller) and before
|
||||
// `runStep`: drop the step, end the turn `aborted`. closeStep balances the
|
||||
// already-appended step/start.
|
||||
if (handle.isCancelled()) {
|
||||
// Cancel landing in the step-start window: a synchronous
|
||||
// `agent/step-start` listener can cancel after the step is already open.
|
||||
// Check AFTER step/start append + emit and before `runStep`: drop the
|
||||
// step, end the turn accordingly. closeStep balances the already-appended
|
||||
// step/start.
|
||||
if (handle.isCancelled() || handle.isDisposed()) {
|
||||
handle.setAbort(undefined)
|
||||
reason = { kind: 'aborted', reason: handle.cancelReason() }
|
||||
reason = handle.isDisposed() ? { kind: 'disposed' } : { kind: 'aborted', reason: handle.cancelReason() }
|
||||
closeStep()
|
||||
break
|
||||
}
|
||||
|
||||
let stepOutcome: { hadToolCalls: boolean; finish: FinishReason } | { error: Error }
|
||||
try {
|
||||
stepOutcome = await runStep(ctx, agent, turn, step, abort.signal)
|
||||
stepOutcome = await runStep(ctx, agent, turn, step, assembly, fullSystemPrompt, abort.signal)
|
||||
} catch (error: unknown) {
|
||||
stepOutcome = { error: toError(error) }
|
||||
} finally {
|
||||
@@ -549,22 +599,22 @@ function drainSteering(ctx: Context, agent: ReactLoopAgent, turn: number): boole
|
||||
return messages.length > 0
|
||||
}
|
||||
|
||||
/** One step: assemble request → stream model → record → execute tools. */
|
||||
/** One step: derive request from the (already pre-step-mutated) surface →
|
||||
* stream model → record → execute tools. The caller assembles the system prompt
|
||||
* and fires the `agent/pre-step` seam BEFORE opening the step, then passes the
|
||||
* resulting `assembly`/`system` here, so the surface this step derives from
|
||||
* already reflects any compaction. */
|
||||
async function runStep(
|
||||
ctx: Context,
|
||||
agent: ReactLoopAgent,
|
||||
turn: number,
|
||||
step: number,
|
||||
assembly: PromptAssembly,
|
||||
system: string,
|
||||
signal: AbortSignal,
|
||||
): Promise<{ hadToolCalls: boolean; finish: FinishReason }> {
|
||||
const { session, options } = agent
|
||||
|
||||
// --- Request assembly ---
|
||||
const assembly = await ctx.systemPrompt.assemble()
|
||||
const system = [renderPrompt(assembly), options.systemPrompt ?? '']
|
||||
.filter(text => text.length > 0)
|
||||
.join('\n\n')
|
||||
|
||||
let request: GenerateOptions = {
|
||||
model: options.model ?? '',
|
||||
messages: session.deriveMessages(),
|
||||
|
||||
@@ -13,7 +13,7 @@
|
||||
import { describe, expect, it } from 'vitest'
|
||||
import { Context } from 'cordis'
|
||||
import LlmService from '@deepseek-ai/dsh-llm'
|
||||
import SessionStore, { TurnEndReason } from '@deepseek-ai/dsh-session'
|
||||
import SessionStore, { SessionId, TurnEndReason } from '@deepseek-ai/dsh-session'
|
||||
import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
|
||||
import ToolRegistry from '@deepseek-ai/dsh-tools'
|
||||
import AgentRegistry, { AgentId } from '@deepseek-ai/dsh-agent'
|
||||
@@ -194,6 +194,73 @@ describe('Agent.cancel()', () => {
|
||||
expect(reasons).toEqual([{ kind: 'aborted', reason: 'from turn-start' }])
|
||||
})
|
||||
|
||||
it('cancel from a synchronous agent/step-start listener drops the step (post-step-start window)', async () => {
|
||||
const adapter = new MockAdapter([textResponse('should not stream')])
|
||||
const ctx = await harness(adapter)
|
||||
const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
|
||||
|
||||
// A step-start listener fires AFTER step/start is appended (and after the
|
||||
// pre-step seam), so cancelling there lands in the SECOND cancel check (the
|
||||
// one that must closeStep() to balance the already-open step) — distinct
|
||||
// from a turn-start cancel, which is caught before the step opens.
|
||||
let streamed = false
|
||||
ctx.on('agent/stream-chunk', () => { streamed = true })
|
||||
const dispose = ctx.on('agent/step-start', (subject) => {
|
||||
if (subject === agent) agent.cancel('from step-start')
|
||||
})
|
||||
|
||||
const reasons: TurnEndReason[] = []
|
||||
ctx.on('agent/turn-end', (_a, _t, reason) => void reasons.push(reason))
|
||||
|
||||
send(agent, 'go')
|
||||
await waitForIdle(ctx, agent)
|
||||
dispose()
|
||||
|
||||
// No step streamed, the turn ended aborted with the caller's reason, and the
|
||||
// log is balanced (the open step was closed by the cancel branch).
|
||||
expect(streamed).toBe(false)
|
||||
expect(reasons).toEqual([{ kind: 'aborted', reason: 'from step-start' }])
|
||||
const types = agent.session.events.map(e => e.type)
|
||||
expect(types.filter(t => t === 'step/start').length).toBe(types.filter(t => t === 'step/end').length)
|
||||
})
|
||||
|
||||
it('disposal from a synchronous agent/step-start listener closes the open step as disposed', async () => {
|
||||
const adapter = new MockAdapter([textResponse('should not stream')])
|
||||
const ctx = new Context()
|
||||
await ctx.plugin(LlmService)
|
||||
await ctx.plugin(SessionStore)
|
||||
await ctx.plugin(SystemPrompt)
|
||||
await ctx.plugin(ToolRegistry)
|
||||
await ctx.plugin(AgentRegistry)
|
||||
await ctx.plugin(AgentLoop, { agents: [] })
|
||||
ctx.llm.registerAdapter(['mock'], adapter)
|
||||
|
||||
const handle = ctx.agents.create({
|
||||
agentId: AgentId('a-dispose-step-start'),
|
||||
sessionId: SessionId('dispose-step-start-session'),
|
||||
agentOptions: { model: 'mock' },
|
||||
})
|
||||
const agent = handle.agent as ReactLoopAgent
|
||||
|
||||
let disposalDone: Promise<void> | undefined
|
||||
let streamed = false
|
||||
ctx.on('agent/stream-chunk', () => { streamed = true })
|
||||
ctx.on('agent/step-start', (subject) => {
|
||||
if (subject === agent) disposalDone = handle.dispose()
|
||||
})
|
||||
|
||||
send(agent, 'go')
|
||||
await disposalDone
|
||||
await agent.done
|
||||
|
||||
expect(streamed).toBe(false)
|
||||
expect(adapter.requests).toHaveLength(0)
|
||||
const turnEnd = agent.session.events.findLast(e => e.type === 'turn/end')
|
||||
expect(turnEnd?.type === 'turn/end' && turnEnd.data.reason).toEqual({ kind: 'disposed' })
|
||||
const types = agent.session.events.map(e => e.type)
|
||||
expect(types.filter(t => t === 'step/start').length).toBe(types.filter(t => t === 'step/end').length)
|
||||
})
|
||||
|
||||
it('cancel during the continuation window ends the turn aborted and runs no further step', async () => {
|
||||
// A continuation-waterfall listener cancels DURING the continuation decision
|
||||
// (the finished step's AbortController is already cleared), and votes to
|
||||
|
||||
@@ -320,6 +320,110 @@ describe('agent loop', () => {
|
||||
expect(adapter.requests[0]!.model).toBe('other-model')
|
||||
})
|
||||
|
||||
it('agent/pre-step fires once per step before the step is opened', async () => {
|
||||
// Two steps (a tool call, then a final text turn) → two model calls → two
|
||||
// pre-step fires, each carrying the assembled full system prompt, BEFORE
|
||||
// the step is opened and its request is derived (the request the adapter
|
||||
// sees reflects any surface state at fire time).
|
||||
const adapter = new MockAdapter([
|
||||
toolCallResponse('c1', 'echo', {}, 'calling echo'),
|
||||
textResponse('done'),
|
||||
])
|
||||
const ctx = await harness(adapter)
|
||||
ctx.tools.register(defineTool({
|
||||
name: 'echo', description: 'echo', parameters: {},
|
||||
async execute() { return [{ type: 'text', text: 'echoed' }] },
|
||||
}))
|
||||
const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
|
||||
|
||||
const fires: { turn: number; step: number; fullSystemPrompt: string }[] = []
|
||||
ctx.on('agent/pre-step', (subject, turn, step, fullSystemPrompt) => {
|
||||
if (subject === agent) fires.push({ turn, step, fullSystemPrompt })
|
||||
})
|
||||
|
||||
send(agent, 'go')
|
||||
await waitForIdle(ctx, agent)
|
||||
|
||||
// One fire per step, in order, each with the assembled system prompt.
|
||||
expect(fires).toEqual([
|
||||
{ turn: 1, step: 1, fullSystemPrompt: '' },
|
||||
{ turn: 1, step: 2, fullSystemPrompt: '' },
|
||||
])
|
||||
})
|
||||
|
||||
it('agent/pre-step fires BEFORE the step it precedes opens (events land outside the step)', async () => {
|
||||
// A listener appending a surface node in pre-step lands it BEFORE step/start
|
||||
// in the log — proving the seam fires outside the step. The node is still in
|
||||
// the derived request for that step (derive happens after step/start).
|
||||
const adapter = new MockAdapter([textResponse('ok')])
|
||||
const ctx = await harness(adapter)
|
||||
const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
|
||||
|
||||
let injected = false
|
||||
ctx.on('agent/pre-step', (subject) => {
|
||||
if (subject === agent && !injected) {
|
||||
injected = true
|
||||
subject.session.append('context/message', {
|
||||
content: [{ type: 'text', text: 'INJECTED-IN-PRE-STEP' }],
|
||||
source: { kind: 'plugin', plugin: 'test' },
|
||||
}, { surfaceOp: 'append' })
|
||||
}
|
||||
})
|
||||
|
||||
send(agent, 'go')
|
||||
await waitForIdle(ctx, agent)
|
||||
|
||||
// The adapter's request includes the node injected during pre-step (derive
|
||||
// reflects it).
|
||||
const text = JSON.stringify(adapter.requests[0]!.messages)
|
||||
expect(text).toContain('INJECTED-IN-PRE-STEP')
|
||||
|
||||
// And the injected event sits BEFORE the first step/start in the log —
|
||||
// the seam fired outside the step.
|
||||
const events = agent.session.events
|
||||
const injectedSeq = events.find(e => e.type === 'context/message')!.seq
|
||||
const firstStepStartSeq = events.find(e => e.type === 'step/start')!.seq
|
||||
expect(injectedSeq).toBeLessThan(firstStepStartSeq)
|
||||
})
|
||||
|
||||
it('a throwing agent/pre-step listener ends the turn (error), not the loop', async () => {
|
||||
// The seam fires before step/start, so a throw escapes to runTurn's outer
|
||||
// catch: the not-yet-open step closes as a no-op, the failure surfaces via
|
||||
// agent/error, and the turn ends `error` (recorded on the durable turn/end).
|
||||
// The loop survives and a follow-up prompt still runs.
|
||||
const adapter = new MockAdapter([textResponse('second turn ok')])
|
||||
const ctx = await harness(adapter)
|
||||
const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
|
||||
|
||||
let throwOnce = true
|
||||
ctx.on('agent/pre-step', () => {
|
||||
if (throwOnce) { throwOnce = false; throw new Error('boom in pre-step') }
|
||||
})
|
||||
|
||||
const errors: Error[] = []
|
||||
ctx.on('agent/error', (_a, _t, _s, error) => void errors.push(error))
|
||||
|
||||
send(agent, 'first')
|
||||
await waitForIdle(ctx, agent)
|
||||
// The first turn failed at step 1 (no model call happened), surfaced via
|
||||
// agent/error, with the durable failure on turn/end.reason.
|
||||
expect(errors).toHaveLength(1)
|
||||
expect(errors[0]!.message).toContain('boom in pre-step')
|
||||
expect(adapter.requests.length).toBe(0)
|
||||
const firstTurnEnd = agent.session.events.find(e => e.type === 'turn/end')
|
||||
expect(firstTurnEnd?.type === 'turn/end' && firstTurnEnd.data.reason).toMatchObject({ kind: 'error', step: 1 })
|
||||
// The step opened-and-closed count stays balanced even though it never ran.
|
||||
const types = agent.session.events.map(e => e.type)
|
||||
expect(types.filter(t => t === 'step/start').length).toBe(types.filter(t => t === 'step/end').length)
|
||||
|
||||
// The loop survived: a second prompt runs a normal completed turn.
|
||||
send(agent, 'second')
|
||||
await waitForIdle(ctx, agent)
|
||||
expect(adapter.requests.length).toBe(1)
|
||||
const lastTurnEnd = agent.session.events.findLast(e => e.type === 'turn/end')
|
||||
expect(lastTurnEnd?.type === 'turn/end' && lastTurnEnd.data.reason).toEqual({ kind: 'completed' })
|
||||
})
|
||||
|
||||
it('cancel() mid-stream ends the turn with reason aborted', async () => {
|
||||
const adapter = new MockAdapter(['hang'])
|
||||
const ctx = await harness(adapter)
|
||||
|
||||
@@ -1047,3 +1047,275 @@ describe('surface: assistant/message omits sourceEventSeqs when no chunks stream
|
||||
expect(JSON.stringify(agent.session.deriveMessages())).toContain('injected')
|
||||
})
|
||||
})
|
||||
|
||||
|
||||
|
||||
describe('disposal/cancel honored during pre-step assembly (P1-1)', () => {
|
||||
it('disposal during system-prompt assembly drops the about-to-start step as disposed', { timeout: 30000 }, async () => {
|
||||
// Block `system-prompt/assemble` on a promise. Start disposal (which
|
||||
// calls stop() synchronously, setting status=disposed), then release the
|
||||
// block. The loop must check isDisposed() after assembly and end the turn
|
||||
// `disposed` — no LLM call. Don't await fiber.dispose() before releasing
|
||||
// the blocker: the dispose chain awaits agent.done, which hangs until the
|
||||
// loop unblocks.
|
||||
const adapter = new MockAdapter(['hang'])
|
||||
let releaseAssemble!: () => void
|
||||
const blocked = new Promise<void>(r => void (releaseAssemble = r))
|
||||
|
||||
const ctx = new Context()
|
||||
await ctx.plugin(LlmService)
|
||||
await ctx.plugin(SessionStore)
|
||||
await ctx.plugin(SystemPrompt)
|
||||
await ctx.plugin(ToolRegistry)
|
||||
await ctx.plugin(AgentRegistry)
|
||||
await ctx.plugin(AgentLoop, { agents: [] })
|
||||
await ctx.plugin(Invariants, { freeze: false })
|
||||
ctx.llm.registerAdapter(['mock'], adapter)
|
||||
|
||||
// Blocking listener on the parent context (survives fiber disposal).
|
||||
const unlisten = ctx.on('system-prompt/assemble', async function (_assembly, next) {
|
||||
await blocked
|
||||
return next()
|
||||
})
|
||||
|
||||
let agent!: ReactLoopAgent
|
||||
const fiber = await ctx.plugin(Object.assign((inner: Context) => {
|
||||
agent = inner.agentLoop.create(AgentId('a-dispose-assemble'), { model: 'mock' })
|
||||
}, { inject: ['agentLoop'] }))
|
||||
|
||||
const reasons: TurnEndReason[] = []
|
||||
ctx.on('agent/turn-end', (_a, _t, reason) => void reasons.push(reason))
|
||||
|
||||
send(agent, 'go')
|
||||
// Give the loop time to enter the step and reach assemble().
|
||||
await new Promise(r => setTimeout(r, 50))
|
||||
|
||||
// Start disposal — stop() sets status=disposed synchronously, then the
|
||||
// disposer's await agent.done hangs because the loop is blocked in the
|
||||
// waterfall. Do NOT await yet; release the blocker first.
|
||||
const disposalDone = fiber.dispose()
|
||||
|
||||
// Now release the blocked waterfall — the loop unblocks, checks
|
||||
// isDisposed(), and exits, which resolves agent.done and disposalDone.
|
||||
releaseAssemble()
|
||||
await disposalDone
|
||||
await agent.done
|
||||
unlisten()
|
||||
|
||||
const e = [...agent.session.events]
|
||||
expect(e.filter(x => x.type === 'turn/start')).toHaveLength(1)
|
||||
expect(e.filter(x => x.type === 'turn/end')).toHaveLength(1)
|
||||
const turnEnd = e.findLast(x => x.type === 'turn/end')
|
||||
expect(turnEnd?.type === 'turn/end' && turnEnd.data.reason).toEqual({ kind: 'disposed' })
|
||||
// No step was opened, no LLM call was made.
|
||||
expect(e.some(x => x.type === 'step/start')).toBe(false)
|
||||
expect(e.some(x => x.type === 'assistant/chunk')).toBe(false)
|
||||
// agent/turn-end may not fire when disposal happens during assembly: the
|
||||
// fiber's disposer (stop→status=disposed) runs before closeTurn(true)'s
|
||||
// emit, and the LIFO chain disposes effects in reverse registration order.
|
||||
// The turn/end durable record is the one that matters.
|
||||
})
|
||||
|
||||
it('cancel during system-prompt assembly drops the about-to-start step as aborted', { timeout: 30000 }, async () => {
|
||||
const adapter = new MockAdapter([textResponse('should not appear')])
|
||||
let releaseAssemble!: () => void
|
||||
const blocker = new Promise<void>(r => void (releaseAssemble = r))
|
||||
|
||||
const ctx = new Context()
|
||||
await ctx.plugin(LlmService)
|
||||
await ctx.plugin(SessionStore)
|
||||
await ctx.plugin(SystemPrompt)
|
||||
await ctx.plugin(ToolRegistry)
|
||||
await ctx.plugin(AgentRegistry)
|
||||
await ctx.plugin(AgentLoop, { agents: [] })
|
||||
await ctx.plugin(Invariants, { freeze: false })
|
||||
ctx.llm.registerAdapter(['mock'], adapter)
|
||||
|
||||
const unlisten = ctx.on('system-prompt/assemble', async function (_assembly, next) {
|
||||
await blocker
|
||||
return next()
|
||||
})
|
||||
|
||||
let agent!: ReactLoopAgent
|
||||
const fiber = await ctx.plugin(Object.assign((inner: Context) => {
|
||||
agent = inner.agentLoop.create(AgentId('a-cancel-assemble'), { model: 'mock' })
|
||||
}, { inject: ['agentLoop'] }))
|
||||
|
||||
const reasons: TurnEndReason[] = []
|
||||
ctx.on('agent/turn-end', (_a, _t, reason) => void reasons.push(reason))
|
||||
|
||||
send(agent, 'go')
|
||||
await new Promise(r => setTimeout(r, 50))
|
||||
agent.cancel('user cancelled during assembly')
|
||||
|
||||
releaseAssemble()
|
||||
await waitForIdle(ctx, agent)
|
||||
await fiber.dispose()
|
||||
await agent.done
|
||||
unlisten()
|
||||
|
||||
const e = [...agent.session.events]
|
||||
expect(e.filter(x => x.type === 'turn/start')).toHaveLength(1)
|
||||
expect(e.filter(x => x.type === 'turn/end')).toHaveLength(1)
|
||||
const turnEnd = e.findLast(x => x.type === 'turn/end')
|
||||
expect(turnEnd?.type === 'turn/end' && turnEnd.data.reason).toEqual({
|
||||
kind: 'aborted',
|
||||
reason: 'user cancelled during assembly',
|
||||
})
|
||||
expect(e.some(x => x.type === 'step/start')).toBe(false)
|
||||
expect(e.some(x => x.type === 'assistant/chunk')).toBe(false)
|
||||
expect(e.some(x => x.type === 'assistant/message')).toBe(false)
|
||||
expect(adapter.requests).toHaveLength(0)
|
||||
expect(reasons).toEqual([{ kind: 'aborted', reason: 'user cancelled during assembly' }])
|
||||
})
|
||||
|
||||
it('disposal during agent/pre-step seam ends the turn disposed', { timeout: 15000 }, async () => {
|
||||
// Block the `agent/pre-step` serial seam on a promise we control, then
|
||||
// dispose the agent's fiber. When the block releases, the loop must see
|
||||
// isDisposed() at the post-seam check and end the turn disposed.
|
||||
const adapter = new MockAdapter(['hang'])
|
||||
let releasePreStep!: () => void
|
||||
const blocker = new Promise<void>(r => void (releasePreStep = r))
|
||||
|
||||
const ctx = new Context()
|
||||
await ctx.plugin(LlmService)
|
||||
await ctx.plugin(SessionStore)
|
||||
await ctx.plugin(SystemPrompt)
|
||||
await ctx.plugin(ToolRegistry)
|
||||
await ctx.plugin(AgentRegistry)
|
||||
await ctx.plugin(AgentLoop, { agents: [] })
|
||||
await ctx.plugin(Invariants, { freeze: false })
|
||||
ctx.llm.registerAdapter(['mock'], adapter)
|
||||
|
||||
ctx.on('agent/pre-step', async () => {
|
||||
await blocker
|
||||
})
|
||||
|
||||
let agent!: ReactLoopAgent
|
||||
const fiber = await ctx.plugin(Object.assign((inner: Context) => {
|
||||
agent = inner.agentLoop.create(AgentId('a-dispose-prestep'), { model: 'mock' })
|
||||
}, { inject: ['agentLoop'] }))
|
||||
|
||||
const reasons: TurnEndReason[] = []
|
||||
ctx.on('agent/turn-end', (_a, _t, reason) => void reasons.push(reason))
|
||||
|
||||
send(agent, 'go')
|
||||
await new Promise(r => setTimeout(r, 50))
|
||||
|
||||
// Start disposal, then release the block, then await disposal.
|
||||
const disposalDone = fiber.dispose()
|
||||
releasePreStep()
|
||||
await disposalDone
|
||||
await agent.done
|
||||
|
||||
// After the pre-step seam finishes, the post-seam cancel/dispose check
|
||||
// catches disposal. The step was never opened, no LLM call was made.
|
||||
const e = [...agent.session.events]
|
||||
expect(e.filter(x => x.type === 'turn/start')).toHaveLength(1)
|
||||
expect(e.filter(x => x.type === 'turn/end')).toHaveLength(1)
|
||||
const turnEnd = e.findLast(x => x.type === 'turn/end')
|
||||
// Disposal wins the post-seam check — reason is `disposed`.
|
||||
expect(turnEnd?.type === 'turn/end' && turnEnd.data.reason).toEqual({ kind: 'disposed' })
|
||||
expect(e.some(x => x.type === 'step/start')).toBe(false)
|
||||
expect(e.some(x => x.type === 'assistant/chunk')).toBe(false)
|
||||
// agent/turn-end may not fire when disposal happens during pre-step: the
|
||||
// fiber's disposer runs before closeTurn(true)'s emit. The durable turn/end
|
||||
// is the authoritative record.
|
||||
})
|
||||
|
||||
it('cancel during agent/pre-step seam ends the turn aborted', { timeout: 15000 }, async () => {
|
||||
// Block `agent/pre-step`, then cancel() the agent. When the block releases,
|
||||
// the post-seam check catches cancellation and ends the turn aborted.
|
||||
const adapter = new MockAdapter(['hang'])
|
||||
let releasePreStep!: () => void
|
||||
const blocker = new Promise<void>(r => void (releasePreStep = r))
|
||||
|
||||
const ctx = new Context()
|
||||
await ctx.plugin(LlmService)
|
||||
await ctx.plugin(SessionStore)
|
||||
await ctx.plugin(SystemPrompt)
|
||||
await ctx.plugin(ToolRegistry)
|
||||
await ctx.plugin(AgentRegistry)
|
||||
await ctx.plugin(AgentLoop, { agents: [] })
|
||||
await ctx.plugin(Invariants, { freeze: false })
|
||||
ctx.llm.registerAdapter(['mock'], adapter)
|
||||
|
||||
ctx.on('agent/pre-step', async () => {
|
||||
await blocker
|
||||
})
|
||||
|
||||
let agent!: ReactLoopAgent
|
||||
const fiber = await ctx.plugin(Object.assign((inner: Context) => {
|
||||
agent = inner.agentLoop.create(AgentId('a-cancel-prestep'), { model: 'mock' })
|
||||
}, { inject: ['agentLoop'] }))
|
||||
|
||||
const reasons: TurnEndReason[] = []
|
||||
ctx.on('agent/turn-end', (_a, _t, reason) => void reasons.push(reason))
|
||||
|
||||
send(agent, 'go')
|
||||
await new Promise(r => setTimeout(r, 30))
|
||||
agent.cancel('user cancelled')
|
||||
|
||||
releasePreStep()
|
||||
await waitForIdle(ctx, agent)
|
||||
await fiber.dispose()
|
||||
await agent.done
|
||||
|
||||
const e = [...agent.session.events]
|
||||
expect(e.filter(x => x.type === 'turn/start')).toHaveLength(1)
|
||||
expect(e.filter(x => x.type === 'turn/end')).toHaveLength(1)
|
||||
const turnEnd = e.findLast(x => x.type === 'turn/end')
|
||||
expect(turnEnd?.type === 'turn/end' && turnEnd.data.reason).toEqual({ kind: 'aborted', reason: 'user cancelled' })
|
||||
expect(e.some(x => x.type === 'step/start')).toBe(false)
|
||||
expect(e.some(x => x.type === 'assistant/chunk')).toBe(false)
|
||||
expect(reasons).toEqual([{ kind: 'aborted', reason: 'user cancelled' }])
|
||||
})
|
||||
|
||||
it('disposal during assembly does not leak an LLM call or append assistant/chunk', { timeout: 15000 }, async () => {
|
||||
// The key assertion from the original bug report: after disposal, no
|
||||
// assistant/chunk or assistant/message appears — the turn ends disposed
|
||||
// before any model interaction.
|
||||
const adapter = new MockAdapter([textResponse('should not appear')])
|
||||
let releaseAssemble!: () => void
|
||||
const blocker = new Promise<void>(r => void (releaseAssemble = r))
|
||||
|
||||
const ctx = new Context()
|
||||
await ctx.plugin(LlmService)
|
||||
await ctx.plugin(SessionStore)
|
||||
await ctx.plugin(SystemPrompt)
|
||||
await ctx.plugin(ToolRegistry)
|
||||
await ctx.plugin(AgentRegistry)
|
||||
await ctx.plugin(AgentLoop, { agents: [] })
|
||||
await ctx.plugin(Invariants, { freeze: false })
|
||||
ctx.llm.registerAdapter(['mock'], adapter)
|
||||
|
||||
ctx.on('system-prompt/assemble', async function (_assembly, next) {
|
||||
await blocker
|
||||
return next()
|
||||
})
|
||||
|
||||
let agent!: ReactLoopAgent
|
||||
const fiber = await ctx.plugin(Object.assign((inner: Context) => {
|
||||
agent = inner.agentLoop.create(AgentId('a-dispose-no-leak'), { model: 'mock' })
|
||||
}, { inject: ['agentLoop'] }))
|
||||
|
||||
send(agent, 'go')
|
||||
await new Promise(r => setTimeout(r, 50))
|
||||
|
||||
const disposalDone = fiber.dispose()
|
||||
releaseAssemble()
|
||||
await disposalDone
|
||||
await agent.done
|
||||
|
||||
const e = [...agent.session.events]
|
||||
expect(e.filter(x => x.type === 'turn/start')).toHaveLength(1)
|
||||
expect(e.filter(x => x.type === 'turn/end')).toHaveLength(1)
|
||||
// The critical assertions: after disposal, the turn has no assistant
|
||||
// artifacts — the turn ended disposed before the model was invoked.
|
||||
expect(e.some(x => x.type === 'assistant/chunk')).toBe(false)
|
||||
expect(e.some(x => x.type === 'assistant/message')).toBe(false)
|
||||
expect(adapter.requests).toHaveLength(0)
|
||||
// The durable turn/end reason is the authoritative record; agent/turn-end
|
||||
// may not fire when disposal interleaves with closeTurn(true)'s emit.
|
||||
})
|
||||
})
|
||||
@@ -37,11 +37,12 @@ The full `agent/*` event taxonomy is declared via declaration merging in `dsh-ag
|
||||
- `agent/turn-start`, `agent/turn-end` (carries `TurnEndReason`)
|
||||
- `agent/step-start`, `agent/step-end`
|
||||
|
||||
#### Interception seams (waterfall)
|
||||
#### Interception seams
|
||||
|
||||
- `agent/request` — mutate `GenerateOptions` before the model call (hooks, compaction, model switching, tool filtering)
|
||||
- `agent/step-result` — post-process the assembled assistant message before tool dispatch (validates what the log records)
|
||||
- `agent/turn-continuation` — override the continue/stop decision (force-continue /loop, force-stop budget guard)
|
||||
- `agent/pre-step` (serial) — mutate the session surface before the step opens and history is derived (compaction). Fires after `turn/start` and before `step/start`, so a listener's appended events land outside the step.
|
||||
- `agent/request` (waterfall) — mutate `GenerateOptions` before the model call (hooks, model switching, tool filtering)
|
||||
- `agent/step-result` (waterfall) — post-process the assembled assistant message before tool dispatch (validates what the log records)
|
||||
- `agent/turn-continuation` (waterfall) — override the continue/stop decision (force-continue /loop, force-stop budget guard)
|
||||
|
||||
#### Streaming + tool (emit)
|
||||
|
||||
|
||||
@@ -179,11 +179,45 @@ declare module 'cordis' {
|
||||
*/
|
||||
'agent/step-end'(agent: Agent, turn: number, step: number): void
|
||||
|
||||
// ---- interception seams (waterfall) ----
|
||||
// ---- step/request extension seams (serial + waterfall) ----
|
||||
/**
|
||||
* Awaited pre-step surface-mutation checkpoint, fired once per step AFTER
|
||||
* `turn/start` (and after the prior step closed) but BEFORE this step's
|
||||
* `step/start` — so anything a listener appends lands OUTSIDE the step,
|
||||
* between `turn/start`/`step/end` and the upcoming `step/start`. `step` is
|
||||
* the number of the step about to start. The loop awaits
|
||||
* `ctx.serial('agent/pre-step', …)` after assembling the system prompt, then
|
||||
* opens the step and derives the request history ONCE from whatever the
|
||||
* surface now holds. This is where compaction belongs: it mutates the session
|
||||
* surface in place (shadowing an older range with a summary node) with its
|
||||
* log-only `compact/*` records cleanly outside any step, and the single
|
||||
* subsequent derive reflects the mutation — so there is no double-derive and
|
||||
* no listener can see (or be expected to act on) an assembled `messages`
|
||||
* array that does not exist yet.
|
||||
*
|
||||
* Serial (awaited in registration order), not a waterfall: a listener
|
||||
* mutates the surface as a side effect; there is nothing to transform, but
|
||||
* the loop must wait for the mutation to complete before opening the step
|
||||
* and deriving. Cordis `serial` bails early if a listener returns a bail
|
||||
* value; this event is typed and documented as `void`, so listeners must not
|
||||
* return a semantic veto value. `fullSystemPrompt` is the assembled prompt a
|
||||
* listener needs to measure pressure (the system prompt counts toward the
|
||||
* budget). `signal` cancels any in-flight work a listener starts (e.g. a
|
||||
* summarization model call).
|
||||
* @mode serial
|
||||
*/
|
||||
// TODO: `fullSystemPrompt` is a smell on a generic per-step seam — compaction
|
||||
// is its only consumer, so a wide event carries a string just one listener
|
||||
// reads. Revisit if no second consumer appears: e.g. hand listeners a lazy
|
||||
// prompt provider, or move token-pressure measurement behind a
|
||||
// compaction-specific seam instead of the shared pre-step checkpoint.
|
||||
'agent/pre-step'(agent: Agent, turn: number, step: number, fullSystemPrompt: string, signal: AbortSignal): Promise<void> | void
|
||||
/**
|
||||
* Waterfall: mutate the fully-assembled {@link GenerateOptions} before the
|
||||
* model call (hooks, compaction, model switching, tool filtering, …). Call
|
||||
* `next()` to delegate, or return without it to short-circuit.
|
||||
* model call (hooks, model switching, tool filtering, …). Call `next()` to
|
||||
* delegate, or return without it to short-circuit. For surface mutation that
|
||||
* must precede history derivation (compaction), use {@link agent/pre-step}
|
||||
* instead — by the time this fires, `options.messages` is already derived.
|
||||
* @mode waterfall
|
||||
*/
|
||||
'agent/request'(agent: Agent, turn: number, step: number, options: GenerateOptions, next: () => Promise<GenerateOptions>): Promise<GenerateOptions>
|
||||
|
||||
@@ -57,7 +57,7 @@ Also defines `TurnTriggerMap` and `TurnEndReasonMap` (merge-extensible sum types
|
||||
|
||||
Every `SessionEvent` carries two optional top-level fields (structural metadata):
|
||||
|
||||
- `sourceEventSeqs?: number[]` — seq numbers of provenance sources (e.g., the `assistant/chunk` seqs behind an `assistant/message`, or the shadowed nodes behind a compaction marker).
|
||||
- `sourceEventSeqs?: number[]` — seq numbers of provenance sources (e.g., the `assistant/chunk` seqs behind an `assistant/message`, or the shadowed nodes behind a compaction replace node).
|
||||
- `surfaceOp?: SurfaceOp` — how this event entered the surface. Absent for non-surface events (boundaries, chunks, usage, errors).
|
||||
|
||||
### Metadata types (`types.ts`)
|
||||
@@ -68,7 +68,7 @@ Every `SessionEvent` carries two optional top-level fields (structural metadata)
|
||||
|
||||
- Persistence plugins: subscribe to `session/event` (write-behind) and drain on `session/flush` (awaited) and fiber dispose. A durable backend reads the log and reloads it into a live session; the metadata seam (`SessionHeader`, `session.header`) is what such a backend stores beside the log.
|
||||
- Replay/fork: `ctx.sessions.create(id, { seed })` seeds a new session with an existing event log. The surface rebuilds deterministically from `surfaceOp` markers in the seeded events. The seed is validated to the SAME invariants `append` enforces — including that every surface-eligible event (`SurfaceEventType`) carries a `surfaceOp` marker — so a marker-less message event is rejected at construction rather than silently vanishing from `deriveMessages()` (the surface is the sole derivation path) on resume.
|
||||
- Compaction: a future plugin appends a new event with `surfaceOp: { op: 'replace', start, end }` to shadow old surface nodes.
|
||||
- Compaction: the `dsh-compact-basic` plugin appends a `user/message` with `surfaceOp: { op: 'replace', start, end }` to shadow old surface nodes behind a summary checkpoint.
|
||||
|
||||
### What is NOT here (TODO)
|
||||
|
||||
|
||||
@@ -19,6 +19,7 @@ export { isJsonValue } from './json.ts'
|
||||
export { interruptedTurnClosers } from './repair.ts'
|
||||
export type { SurfaceNode } from './surface.ts'
|
||||
export { isSurfaceEvent, isSurfaceEligibleType } from './surface.ts'
|
||||
export { isToolPairingBalanced } from './tool-pairing.ts'
|
||||
|
||||
declare module 'cordis' {
|
||||
interface Context {
|
||||
|
||||
@@ -0,0 +1,100 @@
|
||||
/**
|
||||
* Tool-pairing balance over a session's SURFACE: is a given cut point in the
|
||||
* surface a safe edge for a collapsed region (e.g. compaction)?
|
||||
*
|
||||
* The invariant a consumer needs: a collapsed region must never separate an
|
||||
* `assistant/message`'s `tool-call` blocks from their answering `tool/result`s
|
||||
* — that would leave the rehydrated transcript with a dangling tool-call or an
|
||||
* orphaned tool-result, which every provider rejects. (This is the
|
||||
* compaction-time mirror of the crash-recovery imbalance that
|
||||
* {@link interruptedTurnClosers} repairs on load.) Steps were once used as a
|
||||
* proxy for this bracketing, but a compaction REWRITES the surface — it lands a
|
||||
* replacement node at a high log seq whose SURFACE position is the head — so a
|
||||
* scan over the LOG's `step/*` markers mis-reads such a node's neighbours. The
|
||||
* pairing the invariant actually protects lives in the surface nodes' own
|
||||
* content (a `tool-call` block's id, a `tool/result`'s `callId`), which travels
|
||||
* with the node through any reshaping, so alignment is decided over the surface
|
||||
* directly.
|
||||
*
|
||||
* A **cut** is a gap between two adjacent surface nodes (named by the node it
|
||||
* sits immediately before), or the after-tail gap (`null`). Walking the surface
|
||||
* head→tail and assigning each node a delta — `+1` per `tool-call` block on an
|
||||
* `assistant/message`, `-1` per `tool/result`, `0` otherwise — the depth at a
|
||||
* cut is the number of still-unanswered tool calls before it. A cut is
|
||||
* **balanced** when that depth is `0`. A region `[start..end]` is safe to
|
||||
* collapse iff BOTH its edges are balanced cuts: the cut before `start` and the
|
||||
* cut after `end`. Nodes that belong to no step (a pre-step `user/message`, an
|
||||
* inter-step `steering/message`, an injection `context/message`) carry no
|
||||
* pairing, contribute `0`, and so are free boundaries — exactly as before, but
|
||||
* now as a consequence of the balance rather than a special case. An open
|
||||
* trailing step (an assistant whose `tool/result`s have not landed yet) keeps
|
||||
* the depth positive through the tail, so no cut inside it is balanced — the
|
||||
* old explicit open-step check falls out of the same counter.
|
||||
*
|
||||
* @module @deepseek-ai/dsh-session/tool-pairing
|
||||
*/
|
||||
|
||||
import type { SessionEvent } from './types.ts'
|
||||
import type { SurfaceNode } from './surface.ts'
|
||||
|
||||
/**
|
||||
* The tool-pairing delta of a surface node: how it shifts the count of
|
||||
* unanswered tool calls. An `assistant/message` opens one bracket per
|
||||
* `tool-call` block; a `tool/result` closes one; every other surface node
|
||||
* (`user/message`, `context/message`, `steering/message`, a usage-only
|
||||
* `assistant/message` with no tool-call blocks) is pairing-neutral.
|
||||
*/
|
||||
function nodeDelta(event: SessionEvent): number {
|
||||
switch (event.type) {
|
||||
case 'assistant/message':
|
||||
return event.data.content.filter(block => block.type === 'tool-call').length
|
||||
case 'tool/result':
|
||||
return -1
|
||||
// Non-pairing surface nodes and every non-surface event contribute nothing.
|
||||
default:
|
||||
return 0
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Whether the surface prefix ending at the given cut has BALANCED tool-call /
|
||||
* tool-result brackets — i.e. every `tool-call` block on the surface before the
|
||||
* cut has its answering `tool/result` before the cut too, so the cut is a safe
|
||||
* edge for a collapsed region (it cannot split an assistant↔result pair).
|
||||
*
|
||||
* `nodes` is the surface linked list in head→tail order (e.g.
|
||||
* `session.surface.nodes`); `events` is the session log, used to look each
|
||||
* node's event up by `seq`. `beforeSeq` names the cut by the surface node it
|
||||
* sits immediately before; the after-tail cut (the whole surface) is `null`,
|
||||
* as is any `beforeSeq` not present on the surface.
|
||||
*
|
||||
* A region `[start..end]` is collapsible iff both edges are balanced cuts: call
|
||||
* `isToolPairingBalanced(nodes, events, start)` for the cut before `start`, and
|
||||
* `isToolPairingBalanced(nodes, events, after)` — where `after` is `end`'s
|
||||
* surface successor (`SurfaceNode.next`), or `null` when `end` is the tail —
|
||||
* for the cut after `end`.
|
||||
*
|
||||
* @throws if the surface prefix drives the unanswered-call depth negative — a
|
||||
* `tool/result` with no preceding open `tool-call` on the surface. That is a
|
||||
* corrupt surface (a structural invariant violation), surfaced loudly here
|
||||
* rather than silently mis-classifying a boundary.
|
||||
*/
|
||||
export function isToolPairingBalanced(
|
||||
nodes: readonly SurfaceNode[],
|
||||
events: readonly SessionEvent[],
|
||||
beforeSeq: number | null,
|
||||
): boolean {
|
||||
let depth = 0
|
||||
for (const node of nodes) {
|
||||
if (node.seq === beforeSeq) return depth === 0
|
||||
// node.seq is a surface-node seq, always a valid log index by construction.
|
||||
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
|
||||
depth += nodeDelta(events[node.seq]!)
|
||||
if (depth < 0) {
|
||||
throw new Error(`tool-pairing balance: tool/result at surface seq ${node.seq} has no matching tool-call (corrupt surface)`)
|
||||
}
|
||||
}
|
||||
// Reached the after-tail cut (beforeSeq === null, or a seq not on the
|
||||
// surface): the whole-surface prefix is balanced iff depth returned to 0.
|
||||
return depth === 0
|
||||
}
|
||||
@@ -174,7 +174,8 @@ export interface TodoItem {
|
||||
* same events; trace/telemetry = subscribe to the log.
|
||||
*
|
||||
* Merge-extensible: plugins declare extra event types via declaration merging
|
||||
* (e.g. a compaction plugin adds `'compaction/marker'`).
|
||||
* (e.g. the compaction plugin adds `'compact/start'`, `'compact/summary'`,
|
||||
* `'compact/end'`).
|
||||
*
|
||||
* Durability contract (what a persistence backend relies on): the durable log
|
||||
* persists every event verbatim, INCLUDING `assistant/chunk` — `seq` must stay
|
||||
@@ -311,7 +312,7 @@ export type SessionEvent<T extends SessionEventType = SessionEventType> = {
|
||||
/**
|
||||
* Seq numbers of events that are provenance sources of this event
|
||||
* (e.g. the `assistant/chunk` seqs that built an `assistant/message`,
|
||||
* or the surface nodes shadowed by a compaction marker).
|
||||
* or the surface nodes shadowed by a compaction replace node).
|
||||
*/
|
||||
sourceEventSeqs?: number[]
|
||||
/** How this event entered the surface; absent for non-surface events. */
|
||||
|
||||
@@ -278,6 +278,23 @@ describe('Session.append surface opts', () => {
|
||||
// The string 'append' is a primitive — identity-preserving is fine.
|
||||
expect(event.surfaceOp).toBe('append')
|
||||
})
|
||||
|
||||
it('isSurfaceEvent rejects a surface-eligible type missing its surfaceOp marker', () => {
|
||||
// A raw event (not built via append, which mandates the marker) of a
|
||||
// surface-eligible type but with no surfaceOp must NOT narrow to a
|
||||
// SurfaceEvent — it would otherwise be silently dropped from the surface.
|
||||
const noMarker: SessionEvent = {
|
||||
type: 'user/message', seq: 0, time: 1,
|
||||
data: { content: [{ type: 'text', text: 'hi' }], source: { kind: 'user' } },
|
||||
}
|
||||
expect(isSurfaceEvent(noMarker)).toBe(false)
|
||||
// A non-surface type is rejected too (the type gate).
|
||||
const boundary: SessionEvent = { type: 'turn/start', seq: 1, time: 1, data: { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } } }
|
||||
expect(isSurfaceEvent(boundary)).toBe(false)
|
||||
// A properly-marked surface event narrows.
|
||||
const marked = { ...noMarker, surfaceOp: 'append' } as SurfaceEvent
|
||||
expect(isSurfaceEvent(marked)).toBe(true)
|
||||
})
|
||||
})
|
||||
|
||||
describe('surface type guards', () => {
|
||||
|
||||
@@ -0,0 +1,314 @@
|
||||
import { describe, expect, it } from 'vitest'
|
||||
import { CallId } from '@deepseek-ai/dsh-llm'
|
||||
import { Session, SessionId, isToolPairingBalanced } from '../src/index.ts'
|
||||
import type { SessionEvent, SurfaceNode } from '../src/index.ts'
|
||||
|
||||
/**
|
||||
* Unit coverage for the tool-pairing balance check. It decides whether a CUT in
|
||||
* the surface (a gap before a given surface node, or the after-tail gap) is a
|
||||
* safe edge for a collapsed region (compaction): a region must never split an
|
||||
* `assistant/message`'s tool-calls from their `tool/result`s. A cut is balanced
|
||||
* when no unanswered tool-call sits before it on the surface. Nodes belonging to
|
||||
* no step (pre-step user message, inter-step steering, injection context) are
|
||||
* pairing-neutral, so their cuts are free boundaries.
|
||||
*
|
||||
* The fixtures are built through a real {@link Session} so the surface linked
|
||||
* list is derived exactly as production does — including the non-monotonic
|
||||
* surface a `replace` op leaves (a compaction checkpoint at a high log seq
|
||||
* sitting at the surface head), which is the case the abandoned log-position
|
||||
* scan mis-classified.
|
||||
*
|
||||
* Builders mirror the agent loop's real append order: queued user messages land
|
||||
* BEFORE `step/start`; within a step the order is `assistant/message` then
|
||||
* `tool/result`(s); injection turns are a bare `turn/start → context/message →
|
||||
* turn/end` with no step.
|
||||
*/
|
||||
|
||||
const SURFACE = { surfaceOp: 'append' as const }
|
||||
|
||||
/** Surface nodes + log for a session, the two args the balance check takes. */
|
||||
function surfaceOf(session: Session): { nodes: readonly SurfaceNode[]; events: readonly SessionEvent[] } {
|
||||
return { nodes: session.surface.nodes, events: session.events }
|
||||
}
|
||||
|
||||
/** The cut BEFORE the surface node at `seq` is balanced (safe region start). */
|
||||
function startBalanced(session: Session, seq: number): boolean {
|
||||
const { nodes, events } = surfaceOf(session)
|
||||
return isToolPairingBalanced(nodes, events, seq)
|
||||
}
|
||||
|
||||
/** The cut AFTER the surface node at `seq` is balanced (safe region end). */
|
||||
function endBalanced(session: Session, seq: number): boolean {
|
||||
const { nodes, events } = surfaceOf(session)
|
||||
const node = nodes.find(n => n.seq === seq)
|
||||
if (!node) throw new Error(`seq ${seq} is not a surface node`)
|
||||
return isToolPairingBalanced(nodes, events, node.next)
|
||||
}
|
||||
|
||||
/** Surface seq of the nth (0-based) event of a given type. */
|
||||
function seqOf(s: Session, type: SessionEvent['type'], nth = 0): number {
|
||||
return s.events.filter(e => e.type === type)[nth]!.seq
|
||||
}
|
||||
|
||||
/** A closed turn with one closed step holding an assistant + its tool result. */
|
||||
function toolStepSession(): Session {
|
||||
const s = new Session(SessionId('tool-step'))
|
||||
s.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('user/message', { content: [{ type: 'text', text: 'go' }], source: { kind: 'user' } }, SURFACE)
|
||||
s.append('step/start', { turn: 1, step: 1 })
|
||||
s.append('assistant/message', {
|
||||
turn: 1, step: 1,
|
||||
content: [
|
||||
{ type: 'text', text: 'calling' },
|
||||
{ type: 'tool-call', id: CallId('c1'), name: 'bash', arguments: '{}' },
|
||||
],
|
||||
}, SURFACE)
|
||||
s.append('tool/call', { turn: 1, step: 1, callId: CallId('c1'), name: 'bash', arguments: '{}' })
|
||||
s.append('tool/result', { turn: 1, step: 1, callId: CallId('c1'), content: [{ type: 'text', text: 'out' }], isError: false }, SURFACE)
|
||||
s.append('step/end', { turn: 1, step: 1 })
|
||||
s.append('turn/end', { turn: 1, reason: { kind: 'completed' } })
|
||||
return s
|
||||
}
|
||||
|
||||
describe('isToolPairingBalanced — region START (cut before a node)', () => {
|
||||
it('is true for a pre-step user/message (belongs to no step)', () => {
|
||||
const s = toolStepSession()
|
||||
expect(startBalanced(s, seqOf(s, 'user/message'))).toBe(true)
|
||||
})
|
||||
|
||||
it('is true for the first surface node of a step (the assistant/message)', () => {
|
||||
// The cut before the assistant is balanced — nothing unanswered precedes it.
|
||||
const s = toolStepSession()
|
||||
expect(startBalanced(s, seqOf(s, 'assistant/message'))).toBe(true)
|
||||
})
|
||||
|
||||
it('is false for a tool/result whose assistant/message precedes it in the same step', () => {
|
||||
// The cut before the tool/result has one unanswered tool-call (the
|
||||
// assistant's) → starting the region here would orphan that call.
|
||||
const s = toolStepSession()
|
||||
expect(startBalanced(s, seqOf(s, 'tool/result'))).toBe(false)
|
||||
})
|
||||
|
||||
it('is true at the surface head (nothing precedes)', () => {
|
||||
const s = new Session(SessionId('lone'))
|
||||
s.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('user/message', { content: [{ type: 'text', text: 'hi' }], source: { kind: 'user' } }, SURFACE)
|
||||
expect(startBalanced(s, seqOf(s, 'user/message'))).toBe(true)
|
||||
})
|
||||
})
|
||||
|
||||
describe('isToolPairingBalanced — region END (cut after a node)', () => {
|
||||
it('is true for the last surface node of a closed step (the tool/result)', () => {
|
||||
// After the tool/result the assistant's single call is answered → balanced.
|
||||
const s = toolStepSession()
|
||||
expect(endBalanced(s, seqOf(s, 'tool/result'))).toBe(true)
|
||||
})
|
||||
|
||||
it('is false for an assistant/message with a later tool/result in the same step', () => {
|
||||
// After the assistant its tool-call is still unanswered → ending here strands
|
||||
// the result.
|
||||
const s = toolStepSession()
|
||||
expect(endBalanced(s, seqOf(s, 'assistant/message'))).toBe(false)
|
||||
})
|
||||
|
||||
it('is true for a pre-step user/message', () => {
|
||||
const s = toolStepSession()
|
||||
expect(endBalanced(s, seqOf(s, 'user/message'))).toBe(true)
|
||||
})
|
||||
|
||||
it('is false at the tail when the node is inside an open (unclosed) step', () => {
|
||||
// step/start then an assistant tool-call, but no tool/result yet (mid-flight).
|
||||
// The after-tail cut still has one unanswered call → not balanced.
|
||||
const s = new Session(SessionId('open-step'))
|
||||
s.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('step/start', { turn: 1, step: 1 })
|
||||
s.append('assistant/message', {
|
||||
turn: 1, step: 1,
|
||||
content: [{ type: 'tool-call', id: CallId('c1'), name: 'bash', arguments: '{}' }],
|
||||
}, SURFACE)
|
||||
expect(endBalanced(s, seqOf(s, 'assistant/message'))).toBe(false)
|
||||
})
|
||||
|
||||
it('is true at the tail when the node is a trailing inter-step node (step already closed)', () => {
|
||||
// A steering message appended after step/end, at the tail. The prior step's
|
||||
// pair is balanced and steering is neutral → the after-tail cut is balanced.
|
||||
const s = new Session(SessionId('trailing-steer'))
|
||||
s.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('step/start', { turn: 1, step: 1 })
|
||||
s.append('assistant/message', { turn: 1, step: 1, content: [{ type: 'text', text: 'a' }] }, SURFACE)
|
||||
s.append('step/end', { turn: 1, step: 1 })
|
||||
s.append('steering/message', { turn: 1, content: [{ type: 'text', text: 's' }], source: { kind: 'user' } }, SURFACE)
|
||||
expect(endBalanced(s, seqOf(s, 'steering/message'))).toBe(true)
|
||||
})
|
||||
|
||||
it('is true at the tail when no step ever opened', () => {
|
||||
const s = new Session(SessionId('no-step'))
|
||||
s.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('user/message', { content: [{ type: 'text', text: 'hi' }], source: { kind: 'user' } }, SURFACE)
|
||||
expect(endBalanced(s, seqOf(s, 'user/message'))).toBe(true)
|
||||
})
|
||||
})
|
||||
|
||||
describe('isToolPairingBalanced — multiple tool calls in one assistant message', () => {
|
||||
// An assistant message with two tool-calls needs BOTH results before the cut
|
||||
// after it is balanced — depth +2, then -1, -1.
|
||||
function twoCallStep(): Session {
|
||||
const s = new Session(SessionId('two-call'))
|
||||
s.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('step/start', { turn: 1, step: 1 })
|
||||
s.append('assistant/message', {
|
||||
turn: 1, step: 1,
|
||||
content: [
|
||||
{ type: 'tool-call', id: CallId('c1'), name: 'a', arguments: '{}' },
|
||||
{ type: 'tool-call', id: CallId('c2'), name: 'b', arguments: '{}' },
|
||||
],
|
||||
}, SURFACE)
|
||||
s.append('tool/result', { turn: 1, step: 1, callId: CallId('c1'), content: [{ type: 'text', text: '1' }], isError: false }, SURFACE)
|
||||
s.append('tool/result', { turn: 1, step: 1, callId: CallId('c2'), content: [{ type: 'text', text: '2' }], isError: false }, SURFACE)
|
||||
s.append('step/end', { turn: 1, step: 1 })
|
||||
s.append('turn/end', { turn: 1, reason: { kind: 'completed' } })
|
||||
return s
|
||||
}
|
||||
|
||||
it('is unbalanced after the first of two results (one call still open)', () => {
|
||||
const s = twoCallStep()
|
||||
expect(endBalanced(s, seqOf(s, 'tool/result', 0))).toBe(false)
|
||||
})
|
||||
|
||||
it('is balanced after the second result (both calls answered)', () => {
|
||||
const s = twoCallStep()
|
||||
expect(endBalanced(s, seqOf(s, 'tool/result', 1))).toBe(true)
|
||||
})
|
||||
})
|
||||
|
||||
describe('isToolPairingBalanced — a mid-step injection context/message', () => {
|
||||
// A background task-done inject() lands a context/message INSIDE an open step,
|
||||
// between the assistant (with a tool-call) and its tool/result. It is
|
||||
// pairing-neutral, so the cut on EITHER side of it is unbalanced (the call is
|
||||
// still open across it) — it is NOT a free boundary in this position.
|
||||
function midStepInjection(): Session {
|
||||
const s = new Session(SessionId('mid-inject'))
|
||||
s.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('step/start', { turn: 1, step: 1 })
|
||||
s.append('assistant/message', {
|
||||
turn: 1, step: 1,
|
||||
content: [{ type: 'tool-call', id: CallId('c1'), name: 'bash', arguments: '{}' }],
|
||||
}, SURFACE)
|
||||
s.append('context/message', { content: [{ type: 'text', text: 'bg task done' }], source: { kind: 'plugin', plugin: 'tool-bash' } }, SURFACE)
|
||||
s.append('tool/result', { turn: 1, step: 1, callId: CallId('c1'), content: [{ type: 'text', text: 'out' }], isError: false }, SURFACE)
|
||||
s.append('step/end', { turn: 1, step: 1 })
|
||||
s.append('turn/end', { turn: 1, reason: { kind: 'completed' } })
|
||||
return s
|
||||
}
|
||||
|
||||
it('start cut before the mid-step context/message is unbalanced (call still open)', () => {
|
||||
const s = midStepInjection()
|
||||
expect(startBalanced(s, seqOf(s, 'context/message'))).toBe(false)
|
||||
})
|
||||
|
||||
it('end cut after the mid-step context/message is unbalanced (call still open)', () => {
|
||||
const s = midStepInjection()
|
||||
expect(endBalanced(s, seqOf(s, 'context/message'))).toBe(false)
|
||||
})
|
||||
})
|
||||
|
||||
describe('isToolPairingBalanced on an injection turn (no step)', () => {
|
||||
// An idle inject() wraps a context/message in a bare turn/start →
|
||||
// context/message → turn/end with NO step. The context node is a free boundary
|
||||
// both ways (pairing-neutral, nothing open around it).
|
||||
function injectionSession(): Session {
|
||||
const s = new Session(SessionId('injection'))
|
||||
s.append('turn/start', { turn: 1, trigger: { kind: 'injection', source: { kind: 'user' } } })
|
||||
s.append('context/message', { content: [{ type: 'text', text: 'ctx' }], source: { kind: 'user' } }, SURFACE)
|
||||
s.append('turn/end', { turn: 1, reason: { kind: 'completed' } })
|
||||
return s
|
||||
}
|
||||
|
||||
it('start: balanced', () => {
|
||||
const s = injectionSession()
|
||||
expect(startBalanced(s, seqOf(s, 'context/message'))).toBe(true)
|
||||
})
|
||||
|
||||
it('end: balanced', () => {
|
||||
const s = injectionSession()
|
||||
expect(endBalanced(s, seqOf(s, 'context/message'))).toBe(true)
|
||||
})
|
||||
})
|
||||
|
||||
describe('isToolPairingBalanced — CBR-001: a head checkpoint left by a replace op', () => {
|
||||
// The case the log-position scan got wrong. After a compaction, a replacement
|
||||
// user/message lands at a HIGH log seq but sits at the SURFACE head, beside
|
||||
// the still-open step whose events follow it in the log. It carries no
|
||||
// tool-call/result pair (just summarized prose), so it must be a balanced cut
|
||||
// on BOTH sides regardless of its log neighbours.
|
||||
function checkpointHeadedSession(): Session {
|
||||
const s = new Session(SessionId('checkpoint'))
|
||||
// A closed turn with a tool step → surface [u1, asst(call), result].
|
||||
s.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('step/start', { turn: 1, step: 1 })
|
||||
s.append('user/message', { content: [{ type: 'text', text: 'u1' }], source: { kind: 'user' } }, SURFACE)
|
||||
s.append('assistant/message', {
|
||||
turn: 1, step: 1,
|
||||
content: [{ type: 'tool-call', id: CallId('c1'), name: 'bash', arguments: '{}' }],
|
||||
}, SURFACE)
|
||||
s.append('tool/result', { turn: 1, step: 1, callId: CallId('c1'), content: [{ type: 'text', text: 'out' }], isError: false }, SURFACE)
|
||||
s.append('step/end', { turn: 1, step: 1 })
|
||||
s.append('turn/end', { turn: 1, reason: { kind: 'completed' } })
|
||||
// An OPEN turn whose step is in progress (loop fires compaction here).
|
||||
s.append('turn/start', { turn: 2, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('step/start', { turn: 2, step: 1 })
|
||||
// Compaction replaces the whole turn-1 surface ([u1, asst, result]) with one
|
||||
// summary user/message — appended now, so it carries a high log seq.
|
||||
const u1 = seqOf(s, 'user/message')
|
||||
const result = s.events.find(e => e.type === 'tool/result')!.seq
|
||||
s.append('user/message', {
|
||||
content: [{ type: 'text', text: 'CHECKPOINT' }],
|
||||
source: { kind: 'plugin', plugin: 'compact' },
|
||||
}, { surfaceOp: { op: 'replace', start: u1, end: result } })
|
||||
// The step's own assistant/message lands AFTER the checkpoint in the log,
|
||||
// still inside the open step.
|
||||
s.append('assistant/message', { turn: 2, step: 1, content: [{ type: 'text', text: 'a2' }] }, SURFACE)
|
||||
return s
|
||||
}
|
||||
|
||||
it('the head checkpoint sits at the surface head while a later surface node follows it in the log', () => {
|
||||
const s = checkpointHeadedSession()
|
||||
const nodes = s.surface.nodes
|
||||
const checkpointSeq = nodes[0]!.seq
|
||||
// The checkpoint heads the surface, yet a surface node (the open step's
|
||||
// assistant) follows it in LOG order — the exact split between surface
|
||||
// position and log position that the log-position scan tripped on.
|
||||
const laterSurfaceInLog = s.events.find(
|
||||
e => e.seq > checkpointSeq && nodes.some(n => n.seq === e.seq),
|
||||
)
|
||||
expect(laterSurfaceInLog).toBeDefined()
|
||||
expect(nodes[0]!.seq).toBe(checkpointSeq)
|
||||
})
|
||||
|
||||
it('start cut before the head checkpoint is balanced (it is the head)', () => {
|
||||
const s = checkpointHeadedSession()
|
||||
expect(startBalanced(s, s.surface.nodes[0]!.seq)).toBe(true)
|
||||
})
|
||||
|
||||
it('end cut after the head checkpoint is balanced (it carries no tool pair)', () => {
|
||||
// This is the exact assertion the log-position scan failed: the forward log
|
||||
// scan from the checkpoint reached the open step's assistant/message and
|
||||
// wrongly reported mid-step. The surface balance sees a neutral node whose
|
||||
// following cut closes no open call.
|
||||
const s = checkpointHeadedSession()
|
||||
expect(endBalanced(s, s.surface.nodes[0]!.seq)).toBe(true)
|
||||
})
|
||||
})
|
||||
|
||||
describe('isToolPairingBalanced — corrupt surface guard', () => {
|
||||
it('throws when a tool/result has no preceding tool-call (depth goes negative)', () => {
|
||||
// A surface that opens with a tool/result (no assistant call before it) is
|
||||
// structurally corrupt — surfaced loudly rather than mis-classified.
|
||||
const s = new Session(SessionId('corrupt'))
|
||||
s.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('step/start', { turn: 1, step: 1 })
|
||||
s.append('tool/result', { turn: 1, step: 1, callId: CallId('c1'), content: [{ type: 'text', text: 'x' }], isError: false }, SURFACE)
|
||||
const { nodes, events } = surfaceOf(s)
|
||||
expect(() => isToolPairingBalanced(nodes, events, null)).toThrow(/no matching tool-call/)
|
||||
})
|
||||
})
|
||||
@@ -23,6 +23,7 @@
|
||||
"license": "BSD-3-Clause",
|
||||
"peerDependencies": {
|
||||
"@deepseek-ai/dsh-agent": "^0.0.1",
|
||||
"@deepseek-ai/dsh-fs": "^0.0.1",
|
||||
"@deepseek-ai/dsh-llm": "^0.0.1",
|
||||
"cordis": "^4.0.0-rc.6"
|
||||
},
|
||||
@@ -31,6 +32,8 @@
|
||||
},
|
||||
"devDependencies": {
|
||||
"@deepseek-ai/dsh-agent": "workspace:^",
|
||||
"@deepseek-ai/dsh-fs": "workspace:^",
|
||||
"@deepseek-ai/dsh-fs-local": "workspace:^",
|
||||
"@deepseek-ai/dsh-llm": "workspace:^",
|
||||
"cordis": "^4.0.0-rc.6"
|
||||
}
|
||||
|
||||
@@ -13,6 +13,7 @@ import { dirname, join, resolve } from 'node:path'
|
||||
import { homedir } from 'node:os'
|
||||
import { Context, Service } from 'cordis'
|
||||
import { parse as parseYaml } from 'yaml'
|
||||
import type { FileSystem, FsTarget } from '@deepseek-ai/dsh-fs'
|
||||
import type { GenerateOptions } from '@deepseek-ai/dsh-llm'
|
||||
import type {} from '@deepseek-ai/dsh-agent'
|
||||
|
||||
@@ -249,18 +250,13 @@ export class SkillService extends Service {
|
||||
}
|
||||
|
||||
async function writeSystemSkills(systemRoot: string, ctx: Context): Promise<void> {
|
||||
await mkdir(systemRoot, { recursive: true })
|
||||
await Promise.all(SYSTEM_SKILLS.map(async (skill) => {
|
||||
const dir = join(systemRoot, skill.name)
|
||||
const file = join(dir, 'SKILL.md')
|
||||
try {
|
||||
await access(file)
|
||||
if (await skillFileExists(ctx, file)) {
|
||||
return
|
||||
} catch {
|
||||
// Expected first-run path: the bundled system skill has not been installed.
|
||||
}
|
||||
await mkdir(dir, { recursive: true })
|
||||
await writeFile(file, renderSkillFile(skill))
|
||||
await writeSkillText(ctx, file, renderSkillFile(skill))
|
||||
ctx.logger.debug(`installed system skill ${skill.name} at ${file}`)
|
||||
}))
|
||||
}
|
||||
@@ -300,10 +296,8 @@ async function discoverRoot(root: SkillRoot, ctx: Context): Promise<SkillDefinit
|
||||
}
|
||||
|
||||
async function parseSkillFile(path: string, directory: string, source: SkillSource, ctx: Context): Promise<SkillDefinition | undefined> {
|
||||
let raw: string
|
||||
try {
|
||||
raw = await readFile(path, 'utf8')
|
||||
} catch {
|
||||
const raw = await readSkillText(ctx, path)
|
||||
if (raw === undefined) {
|
||||
return undefined
|
||||
}
|
||||
const parsed = parseFrontmatter(raw)
|
||||
@@ -334,6 +328,63 @@ async function parseSkillFile(path: string, directory: string, source: SkillSour
|
||||
}
|
||||
}
|
||||
|
||||
function optionalFileSystem(ctx: Context): FileSystem | undefined {
|
||||
return ctx.get('fs')
|
||||
}
|
||||
|
||||
async function skillFileExists(ctx: Context, path: string): Promise<boolean> {
|
||||
const fs = optionalFileSystem(ctx)
|
||||
if (fs !== undefined) {
|
||||
const target = await fs.resolve(path)
|
||||
return await fs.stat(target) !== undefined
|
||||
}
|
||||
try {
|
||||
await access(path)
|
||||
return true
|
||||
} catch {
|
||||
// Expected first-run path: the bundled system skill has not been installed.
|
||||
return false
|
||||
}
|
||||
}
|
||||
|
||||
async function writeSkillText(ctx: Context, path: string, content: string): Promise<void> {
|
||||
const fs = optionalFileSystem(ctx)
|
||||
if (fs !== undefined) {
|
||||
await fs.writeText(await fs.resolve(path), content)
|
||||
return
|
||||
}
|
||||
await mkdir(dirname(path), { recursive: true })
|
||||
await writeFile(path, content)
|
||||
}
|
||||
|
||||
async function readSkillText(ctx: Context, path: string): Promise<string | undefined> {
|
||||
const fs = optionalFileSystem(ctx)
|
||||
if (fs !== undefined) {
|
||||
return await readSkillTextFromFileSystem(ctx, fs, path)
|
||||
}
|
||||
try {
|
||||
return await readFile(path, 'utf8')
|
||||
} catch {
|
||||
return undefined
|
||||
}
|
||||
}
|
||||
|
||||
async function readSkillTextFromFileSystem(ctx: Context, fs: FileSystem, path: string): Promise<string | undefined> {
|
||||
const target = await fs.resolve(path)
|
||||
const info = await fs.stat(target)
|
||||
if (info === undefined || info.type !== 'file') return undefined
|
||||
try {
|
||||
return await fs.readText(target)
|
||||
} catch (error) {
|
||||
ctx.logger.warn(`skill file ${path} ignored: ${fsReadErrorMessage(target, error)}`)
|
||||
return undefined
|
||||
}
|
||||
}
|
||||
|
||||
function fsReadErrorMessage(target: FsTarget, error: unknown): string {
|
||||
return `failed to read text file at ${target.displayPath}: ${errorMessage(error)}`
|
||||
}
|
||||
|
||||
function parseFrontmatter(raw: string): { data: Record<string, unknown>; body: string } | undefined {
|
||||
if (!raw.startsWith('---\n')) return undefined
|
||||
const end = raw.indexOf('\n---', 4)
|
||||
|
||||
@@ -4,6 +4,7 @@ import { join } from 'node:path'
|
||||
import { tmpdir } from 'node:os'
|
||||
import { Context } from 'cordis'
|
||||
import SkillService from '@deepseek-ai/dsh-skill'
|
||||
import LocalFileSystem from '@deepseek-ai/dsh-fs-local'
|
||||
|
||||
async function tempDir(name: string): Promise<string> {
|
||||
return await import('node:fs/promises').then(fs => fs.mkdtemp(join(tmpdir(), `dsh-${name}-`)))
|
||||
@@ -194,6 +195,24 @@ describe('SkillService', () => {
|
||||
expect(await readFile(join(home, '.dsh/skills/.system/dsh-skill-creator/SKILL.md'), 'utf8')).toContain('dsh-skill-creator')
|
||||
})
|
||||
|
||||
it('uses the filesystem service when installing bundled system skills', async () => {
|
||||
const home = await tempDir('skill-install-fs')
|
||||
const existing = join(home, '.dsh/skills/.system/dsh-plugin-creator/SKILL.md')
|
||||
await mkdir(join(home, '.dsh/skills/.system/dsh-plugin-creator'), { recursive: true })
|
||||
await writeFile(existing, '---\nname: dsh-plugin-creator\ndescription: Existing system skill\n---\n\nExisting body.\n')
|
||||
|
||||
const ctx = new Context()
|
||||
await ctx.plugin(LocalFileSystem, { cwd: home })
|
||||
await ctx.plugin(SkillService, { dshHome: join(home, '.dsh'), agentsHome: join(home, '.agents') })
|
||||
|
||||
expect((await ctx.skills.list()).map(skill => [skill.name, skill.description])).toEqual([
|
||||
['dsh-plugin-creator', 'Existing system skill'],
|
||||
['dsh-skill-creator', 'Create or update DeepSeek Harness SKILL.md instructions.'],
|
||||
])
|
||||
expect(await readFile(existing, 'utf8')).toContain('Existing body.')
|
||||
expect(await readFile(join(home, '.dsh/skills/.system/dsh-skill-creator/SKILL.md'), 'utf8')).toContain('dsh-skill-creator')
|
||||
})
|
||||
|
||||
it('renders bundled system skill files with and without routing metadata', async () => {
|
||||
const home = await tempDir('skill-install-render')
|
||||
|
||||
@@ -205,6 +224,26 @@ describe('SkillService', () => {
|
||||
expect(await readFile(join(home, '.dsh/skills/.system/dsh-skill-creator/SKILL.md'), 'utf8')).toContain('whenToUse:')
|
||||
})
|
||||
|
||||
it('uses the filesystem service for skill file reads when it is available', async () => {
|
||||
const home = await tempDir('skill-read-fs')
|
||||
const root = join(home, '.dsh/skills')
|
||||
await writeFlatSkill(root, 'text-skill', 'Text skill', 'Text body.')
|
||||
await mkdir(join(root, 'empty-dir'), { recursive: true })
|
||||
await mkdir(join(root, 'directory-skill/SKILL.md'), { recursive: true })
|
||||
await writeFile(join(root, 'binary-skill.md'), Buffer.concat([
|
||||
Buffer.from('---\nname: binary-skill\ndescription: Binary skill\n---\n\n'),
|
||||
Buffer.from([0xff]),
|
||||
Buffer.from('\n'),
|
||||
]))
|
||||
|
||||
const ctx = new Context()
|
||||
await ctx.plugin(LocalFileSystem, { cwd: home })
|
||||
await ctx.plugin(SkillService, { dshHome: join(home, '.dsh'), agentsHome: join(home, '.agents'), installSystemSkills: false })
|
||||
|
||||
expect((await ctx.skills.list()).map(skill => skill.name)).toEqual(['text-skill'])
|
||||
expect(await ctx.skills.get('binary-skill')).toBeUndefined()
|
||||
})
|
||||
|
||||
it('degrades when bundled system skill installation fails', async () => {
|
||||
const home = await tempDir('skill-install-fail')
|
||||
await writeFile(join(home, '.dsh'), 'not a directory')
|
||||
|
||||
@@ -8,6 +8,7 @@
|
||||
"references": [
|
||||
{ "path": "../../../vendor/cosmokit" },
|
||||
{ "path": "../../../vendor/cordis" },
|
||||
{ "path": "../../fs/fs" },
|
||||
{ "path": "../../llm/llm" },
|
||||
{ "path": "../agent" }
|
||||
]
|
||||
|
||||
@@ -34,4 +34,4 @@ Merge-extensible: plugins can declare extra fields on `PromptAssembly` via decla
|
||||
### What is NOT here
|
||||
|
||||
- Any hardcoded prompt text — every section comes from plugins.
|
||||
- Prompt compaction (belongs on the `agent/request` seam in `dsh-agent`).
|
||||
- Prompt compaction (belongs on the `agent/pre-step` seam in `dsh-agent`).
|
||||
@@ -8,7 +8,7 @@ Tool registry and execution waterfall. Tool plugins register their schemas and e
|
||||
|
||||
- `ctx.tools.register(definition: ToolDefinition): () => void` Register a tool. Disposed with the calling fiber.
|
||||
- `ctx.tools.get(name: string): ToolDefinition | undefined`
|
||||
- `ctx.tools.schemas(): ToolSchema[]` Schemas of all registered tools (without the `execute` functions).
|
||||
- `ctx.tools.schemas(): ToolSchema[]` Schemas of all registered tools (without the `execute` functions). The shipped tools' schemas are catalogued in [docs/tool-catalog/tools.md](../../../docs/tool-catalog/tools.md), generated by booting each tool plugin and harvesting this method (see [the tool-schema-catalog RFC](../../../docs/rfc/implemented/process/2026-07-02-tool-schema-catalog.md)).
|
||||
- `ctx.tools.execute(exec: ToolExecution): Promise<ToolExecutionResult>` Execute one tool call through the `tools/execute` waterfall.
|
||||
|
||||
### Injected services
|
||||
@@ -72,7 +72,7 @@ See `defineTool`, `validateArgs`, `ToolArgsError`, `SchemaSpec`, `InferArgs`, an
|
||||
|
||||
A tool owns how ITS calls render in a UI (an editor's tool-call card, a CLI log line) — a UI plugin must NOT special-case tool names. A `ToolDefinition` may declare two optional, pure, display-only methods:
|
||||
|
||||
- `presentCall(args): ToolCallPresentation | undefined` — the PENDING state: a human-readable `title` (always-visible label), an optional `kind` (`read`/`edit`/`execute`/… for icon/treatment, default `other`), an optional `rawInput` (the salient input to show in a detail view — e.g. a shell command as a string, NOT the whole args object), an optional `content` (UI content shown alongside the title/card — e.g. a bash `description` as a text block above the terminal card), and an optional `terminal` (a neutral `{ cwd? }` asking a capable UI to render this call as a TERMINAL, e.g. for `bash`).
|
||||
- `presentCall(args): ToolCallPresentation | undefined` — the PENDING state: a human-readable `title` (always-visible label), an optional `kind` (`read`/`edit`/`execute`/… for icon/treatment, default `other`), an optional `rawInput` (the salient input to show in a detail view — e.g. a shell command as a string, NOT the whole args object), an optional `content` (UI content shown alongside the title/card — e.g. a bash `description` as a text block above the terminal card), an optional `locations` (`{ path, line? }[]` — the files this call reads/modifies, so a capable UI can follow along / jump to them; the ACP bridge forwards them as `tool_call.locations`), and an optional `terminal` (a neutral `{ cwd? }` asking a capable UI to render this call as a TERMINAL, e.g. for `bash`).
|
||||
- `presentResult(args, result): ToolResultPresentation | undefined` — the COMPLETED state, given the same `args` and the `{ content, isError }` result: an optional replacement `title`, reformatted `content` (e.g. wrap command output in a fenced ` ```console ` block — a UI-only affordance that must NOT appear in the model-facing `execute` result), and an optional `terminal` (the `{ output?, exitCode?, signal? }` for a terminal-rendered call). The `ToolTerminal` shape is provider-neutral; a UI bridge (the ACP bridge) maps it to a terminal card (with an exit-status pill) and a UI that can't ignores it and uses `content`.
|
||||
|
||||
Returning `undefined` (or omitting a method) tells a UI to fall back to a generic presentation (title = tool name, raw args as input, raw result content). Both methods must be **pure and side-effect-free**: a UI may call them during live streaming AND during a session-log replay, so they depend only on their arguments. With `defineTool`, `args` is the typed `InferArgs<S>` shape; the helper soft-validates before calling (a malformed/older logged arg shape yields `undefined` rather than throwing, since display must never crash a replay). The shapes are provider-neutral — the ACP bridge (`dsh-acp`) maps them to ACP `tool_call`/`tool_call_update` wire fields, and `dsh-tool-bash` is the reference implementation.
|
||||
|
||||
@@ -109,6 +109,16 @@ export interface ToolCallPresentation {
|
||||
* {@link terminal} block (if any) as a terminal card.
|
||||
*/
|
||||
content?: ContentBlock[]
|
||||
/**
|
||||
* Files this call reads or modifies, so a capable UI can "follow along" —
|
||||
* highlight or jump to the file (and line) as the tool runs. Provider-neutral
|
||||
* `{ path, line? }` pairs; a UI bridge maps them to its own affordance (the ACP
|
||||
* bridge forwards them as `tool_call.locations`). `path` is what the tool
|
||||
* operated on (the model-facing path); `line` is an optional 1-based line to
|
||||
* focus (e.g. a read's offset). Omit for a call that touches no file (e.g.
|
||||
* `bash`).
|
||||
*/
|
||||
locations?: { path: string; line?: number }[]
|
||||
/**
|
||||
* Ask a capable UI to render this call as a TERMINAL (a command running in a
|
||||
* working directory), not a generic tool card — set by a tool whose call IS a
|
||||
|
||||
@@ -0,0 +1,117 @@
|
||||
/**
|
||||
* Guarantee tests for the tool-schema catalog generator
|
||||
* (`scripts/gen-tool-catalog.ts`).
|
||||
*
|
||||
* The generated catalog is frozen by a regenerate-and-diff freshness gate, so
|
||||
* the freshness half is exercised by `pnpm run verify-tool-catalog` in CI. What
|
||||
* a freshness diff CANNOT prove is (a) that BOOTING the tool plugins yields the
|
||||
* shipped schema — the whole reason this generator boots instead of parsing
|
||||
* source (a runtime-spread enum resolves to its literal members) — and (b) that
|
||||
* the completeness guard REJECTS a tool package missing from the boot manifest,
|
||||
* the property that replaces the AST pass's "nothing silently omitted". These
|
||||
* tests drive the exported `collectToolCatalog` / `assertManifestComplete` /
|
||||
* `render` directly, mirroring the negative-path style of the cordis-catalog
|
||||
* generator tests.
|
||||
*/
|
||||
|
||||
import { describe, expect, it } from 'vitest'
|
||||
import {
|
||||
assertManifestComplete,
|
||||
collectToolCatalog,
|
||||
render,
|
||||
type ToolCatalog,
|
||||
} from '../../../../scripts/gen-tool-catalog.ts'
|
||||
|
||||
/** JSON Schema shape enough to reach the values AST extraction can't. */
|
||||
interface JsonSchema {
|
||||
type: string
|
||||
properties?: Record<string, JsonSchema>
|
||||
items?: JsonSchema
|
||||
enum?: string[]
|
||||
required?: string[]
|
||||
}
|
||||
|
||||
describe('gen-tool-catalog collectToolCatalog', () => {
|
||||
it('boots every shipped tool package and harvests its model-facing schemas', async () => {
|
||||
const catalog = await collectToolCatalog()
|
||||
const names = catalog.flatMap(entry => entry.schemas.map(s => s.name)).sort()
|
||||
expect(names).toEqual(['bash', 'bash_kill', 'bash_output', 'edit', 'read', 'skill', 'subagent', 'todo_write', 'write'])
|
||||
// Every tool carries a JSON-Schema `parameters` object (what the model sees).
|
||||
for (const entry of catalog) {
|
||||
for (const schema of entry.schemas) {
|
||||
expect((schema.parameters as unknown as JsonSchema).type).toBe('object')
|
||||
}
|
||||
}
|
||||
})
|
||||
|
||||
it('resolves a runtime-spread enum to its literal members (the payoff over AST)', async () => {
|
||||
const catalog = await collectToolCatalog()
|
||||
const todo = catalog
|
||||
.flatMap(entry => entry.schemas)
|
||||
.find(s => s.name === 'todo_write')
|
||||
// `todo-todo` writes `enum: [...STATUSES]` — a source AST would see the
|
||||
// spread, not the values. Booting yields the shipped enum literals.
|
||||
const status = (((todo?.parameters as unknown as JsonSchema).properties?.todos)?.items)?.properties?.status
|
||||
expect(status?.enum).toEqual(['pending', 'in_progress', 'completed'])
|
||||
})
|
||||
|
||||
it('attributes each package with a source pointer that names its index', async () => {
|
||||
const catalog = await collectToolCatalog()
|
||||
const bash = catalog.find(entry => entry.pkg === '@deepseek-ai/dsh-tool-bash')
|
||||
expect(bash?.source).toBe('packages/bash/tool-bash/src/index.ts')
|
||||
})
|
||||
|
||||
it('records the shipped `subagent_fork` alias in a note (config-driven tool name)', async () => {
|
||||
// `tool-subagent`'s registered name is the load-time `toolName` config, so
|
||||
// the shipped agents surface this one package as both `subagent` and
|
||||
// `subagent_fork`. Booting yields only the default name; the note is how a
|
||||
// reader learns the fork alias the model also sees. Without it the catalog
|
||||
// would silently under-report the shipped tool surface.
|
||||
const catalog = await collectToolCatalog()
|
||||
const subagent = catalog.find(entry => entry.pkg === '@deepseek-ai/dsh-tool-subagent')
|
||||
expect(subagent?.schemas.map(s => s.name)).toEqual(['subagent'])
|
||||
expect(subagent?.note).toMatch(/subagent_fork/)
|
||||
})
|
||||
})
|
||||
|
||||
describe('gen-tool-catalog assertManifestComplete', () => {
|
||||
it('passes when the manifest lists every on-disk tool package (the default)', () => {
|
||||
expect(() => { assertManifestComplete() }).not.toThrow()
|
||||
})
|
||||
|
||||
it('throws, naming the omitted package, when a tool package is missing from the manifest', () => {
|
||||
// An empty manifest scanned against the real tree: every `tool-*` package
|
||||
// is unlisted, so the guard must fire and name them.
|
||||
expect(() => { assertManifestComplete([]) }).toThrow(/not in the boot manifest/)
|
||||
expect(() => { assertManifestComplete([]) }).toThrow(/tool-bash/)
|
||||
})
|
||||
})
|
||||
|
||||
describe('gen-tool-catalog render', () => {
|
||||
it('emits a package heading, a tool heading, and a json schema fence', () => {
|
||||
const catalog: ToolCatalog = [
|
||||
{
|
||||
pkg: '@deepseek-ai/dsh-tool-demo',
|
||||
source: 'packages/demo/tool-demo/src/index.ts',
|
||||
schemas: [{ name: 'demo', description: 'A demo tool.', parameters: { type: 'object', properties: {} } }],
|
||||
},
|
||||
]
|
||||
const md = render(catalog)
|
||||
expect(md).toContain('## `@deepseek-ai/dsh-tool-demo`')
|
||||
expect(md).toContain('### `demo`')
|
||||
expect(md).toContain('A demo tool.')
|
||||
expect(md).toContain('```json')
|
||||
expect(md).toContain('Source: [`packages/demo/tool-demo/src/index.ts`]')
|
||||
})
|
||||
|
||||
it('renders the strict flag when a schema sets it', () => {
|
||||
const catalog: ToolCatalog = [
|
||||
{
|
||||
pkg: '@deepseek-ai/dsh-tool-demo',
|
||||
source: 'packages/demo/tool-demo/src/index.ts',
|
||||
schemas: [{ name: 'demo', description: '', parameters: { type: 'object', properties: {} }, strict: true }],
|
||||
},
|
||||
]
|
||||
expect(render(catalog)).toContain('Strict: `true`')
|
||||
})
|
||||
})
|
||||
@@ -0,0 +1,12 @@
|
||||
# fs/ - filesystem capability family
|
||||
|
||||
The filesystem stack: a provider seam (text IO + atomic mutation with an optional version guard), a local implementation, a policy gate plugin (observed-state + read-before-edit + version-guarded write/edit), and the model-facing file tools + executor. All **product** packages.
|
||||
|
||||
| Package | Role | ctx key |
|
||||
|---|---|---|
|
||||
| `fs/` | Provider seam: text IO + atomic mutation primitives (optional version guard); owns the `fs/*` policy events | `ctx.fs` |
|
||||
| `fs-local/` | Local-filesystem `FileSystem` implementation | (registers `ctx.fs`) |
|
||||
| `fs-policy/` | Policy gate plugin: observed-state + read-before-edit + version-guarded write/edit, via the `fs/*` event gate | (no service — `fs/*` listeners) |
|
||||
| `tool-fs/` | Model-facing `read`/`write`/`edit` tools AND the executor (reads via `ctx.fs`, owns read windowing, dispatches `fs/*`) | (registers on `ctx.tools`) |
|
||||
|
||||
The interface lives at `fs/fs/`. A sandboxed, remote, or project-scoped filesystem backend can replace `fs-local` without touching the seam, the policy gate, or the model-facing tool schemas. The policy (`fs-policy/`) is a plugin that participates only through the `fs/*` event gate, not a service the tool injects — so dropping it gracefully loses the policy and leaves the unconstrained bare provider rather than breaking the tool. A deployment that loads `tool-fs/` is expected to also load it.
|
||||
@@ -0,0 +1,25 @@
|
||||
# @deepseek-ai/dsh-fs-local
|
||||
|
||||
The **local-filesystem implementation** of the `ctx.fs` provider seam ([`@deepseek-ai/dsh-fs`](../fs)). Backs the six `FileSystem` primitives with the host filesystem; loading it as a plugin populates `ctx.fs`.
|
||||
|
||||
```ts ignore-check
|
||||
import { LocalFileSystem } from '@deepseek-ai/dsh-fs-local'
|
||||
|
||||
await ctx.plugin(LocalFileSystem, { cwd: process.cwd() })
|
||||
// ctx.fs is now the local backend; load @deepseek-ai/dsh-fs-policy for the
|
||||
// freshness policy gate and @deepseek-ai/dsh-tool-fs to expose read/write/edit.
|
||||
```
|
||||
|
||||
## Behavior
|
||||
|
||||
- **`resolve(path, opts?)`** — a relative `path` resolves against `opts.cwd` when the caller supplies one (the model-facing tools pass the calling agent's session cwd — see [the per-session cwd RFC](../../../docs/rfc/implemented/architecture/2026-07-02-fs-per-session-cwd.md)), else `config.cwd` (default `process.cwd()`); an absolute `path` ignores both. The `targetKey` is the file's `realpath`, so two input paths reaching the same file through symlinks share one identity, and writes/edits land on the link target (preserving the link). A not-yet-existing path uses the realpathed parent directory plus basename when the parent exists; only an unresolvable parent falls back to the absolute path. `displayPath` is the absolute (un-resolved) path.
|
||||
- **`stat`** — returns `FsInfo` (`version` = `mtimeMs:size`, `type` of `file`/`directory`/`other`, byte `size`) or `undefined` when the target is absent.
|
||||
- **`readText` / `streamText`** — UTF-8 only. `readText` reads the whole file; `streamText` streams it in chunks (cross-chunk decoding) so a huge file never has to be held whole in memory. Both reject invalid UTF-8 and NUL-byte binary samples (`FS_NOT_TEXT`) and non-regular targets. The `read` tool (`@deepseek-ai/dsh-tool-fs`) decides which to call by size and owns the line windowing.
|
||||
- **`writeText`** — atomic: writes to a temp file opened exclusively (`wx`, `0o600`) inside a randomly-named private staging dir (`0o700`) next to the target, fsyncs, then renames over the target. An existing file's mode is preserved, while new files default to `0o600`. The `expected` guard is OPTIONAL: omitting it unconditionally creates-or-overwrites; `createIfAbsent` creates a missing target and rejects an existing one (`FS_NOT_OBSERVED`); `replaceIfVersion` replaces only at the observed version (a missing target or mismatch is `FS_STALE_VERSION`).
|
||||
- **`editText`** — atomic literal read-modify-write over the same primitive, serialized per target by a mutation lock. The `expected` guard is OPTIONAL: when supplied it verifies the version BEFORE literal matching (a stale edit reports `FS_STALE_VERSION`, never `FS_EDIT_NOT_FOUND`/`FS_AMBIGUOUS_EDIT` against newer content); omitting it edits the current content unconditionally. A missing target reports `FS_STALE_VERSION` either way. LF-normalizes for matching, restores the file's dominant CRLF/LF style, and rejects empty `oldString` / zero matches (`FS_EDIT_NOT_FOUND`) or ambiguous multi-matches without `replace_all` (`FS_AMBIGUOUS_EDIT`).
|
||||
|
||||
## `cwd` is not a sandbox
|
||||
|
||||
`config.cwd` is a resolution default, not a containment boundary — absolute paths and `..` escape it. Enforce containment with a stricter `ctx.fs` backend or a permission plugin on the `tools/execute` waterfall. See [the filesystem capability-seam RFC's Risks section](../../../docs/rfc/implemented/architecture/2026-06-17-filesystem-capability-seam.md#risks).
|
||||
|
||||
The raw I/O lives in `src/fsio.ts` (Cordis-free, independently unit-tested); `src/index.ts` is the thin service wiring.
|
||||
@@ -0,0 +1,36 @@
|
||||
{
|
||||
"name": "@deepseek-ai/dsh-fs-local",
|
||||
"description": "Local-filesystem implementation of the DeepSeek Harness filesystem seam (ctx.fs)",
|
||||
"version": "0.0.1",
|
||||
"private": true,
|
||||
"type": "module",
|
||||
"main": "lib/index.js",
|
||||
"types": "lib/types/index.d.ts",
|
||||
"exports": {
|
||||
".": {
|
||||
"types": "./lib/types/index.d.ts",
|
||||
"default": "./lib/index.js"
|
||||
},
|
||||
"./src/*": "./src/*",
|
||||
"./package.json": "./package.json"
|
||||
},
|
||||
"files": [
|
||||
"lib/index.js",
|
||||
"lib/types/**/*.d.ts",
|
||||
"lib/types/**/*.d.ts.map",
|
||||
"src"
|
||||
],
|
||||
"license": "BSD-3-Clause",
|
||||
"peerDependencies": {
|
||||
"@deepseek-ai/dsh-fs": "^0.0.1",
|
||||
"cordis": "^4.0.0-rc.6"
|
||||
},
|
||||
"dependencies": {
|
||||
"schemastery": "^3.18.0"
|
||||
},
|
||||
"devDependencies": {
|
||||
"@deepseek-ai/dsh-fs": "workspace:^",
|
||||
"@deepseek-ai/dsh-llm": "workspace:^",
|
||||
"cordis": "^4.0.0-rc.6"
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,413 @@
|
||||
/**
|
||||
* Cordis-free local-filesystem I/O for `@deepseek-ai/dsh-fs-local`. Kept
|
||||
* separate from the service class (mirroring `dsh-bash-local`'s `run.ts`) so
|
||||
* the raw stat/read/write/edit mechanics can be unit-tested without a Context.
|
||||
*
|
||||
* This is the PROVIDER layer: it hands back decoded whole-file text (validated
|
||||
* UTF-8, binary rejected) — never line windows or numbered lines, which are
|
||||
* model-facing read policy owned by `@deepseek-ai/dsh-fs-policy`. Large files
|
||||
* stream their text in chunks so a huge file never has to be held whole in
|
||||
* memory; the binary/NUL sample and cross-chunk UTF-8 decoding stay here.
|
||||
*
|
||||
* Writes are atomic: content goes to a temp file opened exclusively (`wx`,
|
||||
* `0o600`, so a pre-existing path can never be clobbered and write-in-progress
|
||||
* bytes stay owner-only) inside a randomly-named private staging directory
|
||||
* (`0o700`) next to the target, then `rename`d over the target. Edits are
|
||||
* read-modify-write over the same atomic primitive.
|
||||
*
|
||||
* @module @deepseek-ai/dsh-fs-local/fsio
|
||||
*/
|
||||
|
||||
import { randomUUID } from 'node:crypto'
|
||||
import { createReadStream } from 'node:fs'
|
||||
import { chmod, mkdir, open, readFile, realpath, rename, rm, stat } from 'node:fs/promises'
|
||||
import type { Stats } from 'node:fs'
|
||||
import { basename, dirname, join, resolve } from 'node:path'
|
||||
import { TextDecoder } from 'node:util'
|
||||
import { FsError, FsTargetKey, FsVersion } from '@deepseek-ai/dsh-fs'
|
||||
|
||||
/** Files at or above this size stream their text; smaller files read whole. */
|
||||
export const STREAM_MIN_SIZE = 10 * 1024 * 1024
|
||||
|
||||
const BINARY_SAMPLE_BYTES = 8192
|
||||
|
||||
function isENOENT(error: unknown): boolean {
|
||||
return error instanceof Error && 'code' in error && error.code === 'ENOENT'
|
||||
}
|
||||
|
||||
/**
|
||||
* A path component that is expected to be a directory is a regular file (e.g.
|
||||
* resolving `afile/child.txt` when `afile` is a file). Like `ENOENT`, the target
|
||||
* cannot exist — so the resolution/probe paths treat it as "absent" rather than
|
||||
* letting a raw Node error escape without the structured `FsError` taxonomy.
|
||||
*/
|
||||
function isENOTDIR(error: unknown): boolean {
|
||||
return error instanceof Error && 'code' in error && error.code === 'ENOTDIR'
|
||||
}
|
||||
|
||||
function isAbortError(error: unknown): boolean {
|
||||
return error instanceof Error && error.name === 'AbortError'
|
||||
}
|
||||
|
||||
/* v8 ignore start -- composes secondary cleanup-failure messages, which require a filesystem/kernel fault after the primary failure. */
|
||||
function errorMessage(error: unknown): string {
|
||||
return error instanceof Error ? error.message : String(error)
|
||||
}
|
||||
/* v8 ignore stop */
|
||||
|
||||
function throwIfAborted(signal: AbortSignal | undefined, verb: string): void {
|
||||
if (signal?.aborted) throw new FsError(`${verb} aborted`, 'FS_ABORTED')
|
||||
}
|
||||
|
||||
/**
|
||||
* `readFile` with the supplied signal, translating a mid-read `AbortError` into
|
||||
* the seam's structured `FsError('FS_ABORTED')` (Node rejects an aborted
|
||||
* `readFile` with a bare `AbortError`, which would otherwise escape the seam's
|
||||
* error taxonomy — the streaming/write paths translate it the same way).
|
||||
*/
|
||||
async function readFileAbortable(absolutePath: string, verb: 'read' | 'edit', signal?: AbortSignal): Promise<Buffer> {
|
||||
try {
|
||||
return await readFile(absolutePath, signal ? { signal } : {})
|
||||
} catch (error: unknown) {
|
||||
/* v8 ignore next 2 -- a non-abort readFile rejection needs a permission/IO fault racing an open file. */
|
||||
if (!isAbortError(error)) throw error
|
||||
throw new FsError(`${verb} aborted`, 'FS_ABORTED')
|
||||
}
|
||||
}
|
||||
|
||||
/** Opaque version token from a stat: mtime (ns precision) + size. */
|
||||
function versionOf(info: Stats): FsVersion {
|
||||
return FsVersion(`${info.mtimeMs}:${info.size}`)
|
||||
}
|
||||
|
||||
/**
|
||||
* Test seam: lets specs force the streaming read path (via a small
|
||||
* `streamMinSize`) and pin the temp-file name (to prove exclusive-open
|
||||
* behavior) without a 10 MB fixture or a name race.
|
||||
*/
|
||||
export interface FsIoInternals {
|
||||
/** Override {@link STREAM_MIN_SIZE} for read routing. */
|
||||
streamMinSize?: number
|
||||
/** Override the generated private staging-dir name (relative to the target dir). */
|
||||
tempDirName?: (writePath: string) => string
|
||||
/** Override the generated temp-file name (relative to the private staging dir). */
|
||||
tempName?: (writePath: string) => string
|
||||
/** Test hook after the temp file is written/synced but before final chmod+rename. */
|
||||
inspectTemp?: (paths: { stagingDir: string; tempPath: string }) => void | Promise<void>
|
||||
}
|
||||
|
||||
/** A resolved local path: the absolute path shown to callers and its realpath identity. */
|
||||
export interface LocalTarget {
|
||||
/** Absolute path (symlinks not resolved) — used for display. */
|
||||
displayPath: string
|
||||
/** Realpath identity — used as the stable target key and the I/O path. */
|
||||
targetKey: FsTargetKey
|
||||
}
|
||||
|
||||
/** Result of probing a path: null when it does not exist. */
|
||||
export interface PathInfo {
|
||||
version: FsVersion
|
||||
mode: number
|
||||
type: 'file' | 'directory' | 'other'
|
||||
size: number
|
||||
}
|
||||
|
||||
/**
|
||||
* Resolve a path to its absolute display path and realpath identity. Relative
|
||||
* paths are based on `cwd`. When the file itself does not yet exist, the
|
||||
* `targetKey` realpaths the nearest EXISTING ancestor directory and re-appends
|
||||
* the still-missing suffix, so a not-yet-created file gets the same stable key
|
||||
* it will have after creation — even when an ancestor (e.g. `cwd`) is a symlink
|
||||
* and intermediate directories are created by the write. Two input paths
|
||||
* reaching the same file via symlinks share one key. Falls back to the absolute
|
||||
* path only when no ancestor (not even the filesystem root) can be resolved.
|
||||
*/
|
||||
export async function resolveLocalTarget(cwd: string, path: string): Promise<LocalTarget> {
|
||||
if (path.trim().length === 0) throw new FsError('file_path must be a non-empty string', 'FS_NOT_FOUND')
|
||||
const displayPath = resolve(cwd, path)
|
||||
try {
|
||||
// Prefer the file's own realpath (resolves a symlinked file to its target).
|
||||
return { displayPath, targetKey: FsTargetKey(await realpath(displayPath)) }
|
||||
} catch (error: unknown) {
|
||||
// A path component is a file, not a directory (e.g. "afile/child.txt" where
|
||||
// "afile" is a regular file): the target can neither exist nor be created,
|
||||
// so surface the structured taxonomy instead of a raw Node ENOTDIR.
|
||||
if (isENOTDIR(error)) throw new FsError(`cannot resolve "${displayPath}": a parent path segment is not a directory`, 'FS_NOT_FOUND')
|
||||
/* v8 ignore next -- non-ENOENT realpath failure needs a permission/IO fault; ENOENT falls through to ancestor resolution. */
|
||||
if (!isENOENT(error)) throw error
|
||||
}
|
||||
// File absent: realpath the nearest existing ancestor and re-append the
|
||||
// missing suffix (the file basename plus any not-yet-created intermediate
|
||||
// dirs), so the key is stable across creation of those dirs.
|
||||
const missing = [basename(displayPath)]
|
||||
let ancestor = dirname(displayPath)
|
||||
while (true) {
|
||||
try {
|
||||
const realAncestor = await realpath(ancestor)
|
||||
return { displayPath, targetKey: FsTargetKey(join(realAncestor, ...missing)) }
|
||||
} catch (error: unknown) {
|
||||
/* v8 ignore next -- a non-ENOENT realpath failure needs a permission/IO fault. */
|
||||
if (!isENOENT(error)) throw error
|
||||
const parent = dirname(ancestor)
|
||||
/* v8 ignore next -- the filesystem root always realpaths, so the walk terminates before parent === ancestor. */
|
||||
if (parent === ancestor) return { displayPath, targetKey: FsTargetKey(displayPath) }
|
||||
missing.unshift(basename(ancestor))
|
||||
ancestor = parent
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/** Probe a path for its version, mode, type, and size. Null if absent. */
|
||||
export async function probe(absolutePath: string): Promise<PathInfo | null> {
|
||||
try {
|
||||
const info = await stat(absolutePath)
|
||||
const type = info.isFile() ? 'file' : info.isDirectory() ? 'directory' : 'other'
|
||||
return { version: versionOf(info), mode: info.mode & 0o777, type, size: info.size }
|
||||
} catch (error: unknown) {
|
||||
// ENOENT (no such file) and ENOTDIR (a parent segment is a file) both mean
|
||||
// the target is absent; any other stat failure is a real permission/IO fault.
|
||||
/* v8 ignore next -- a non-ENOENT/ENOTDIR stat failure needs a permission/IO fault; surface it. */
|
||||
if (!isENOENT(error) && !isENOTDIR(error)) throw error
|
||||
return null
|
||||
}
|
||||
}
|
||||
|
||||
// --- Reading ---
|
||||
|
||||
function notTextError(verb: 'read' | 'edit', displayPath: string): FsError {
|
||||
return new FsError(`cannot ${verb} "${displayPath}": invalid UTF-8 text`, 'FS_NOT_TEXT')
|
||||
}
|
||||
|
||||
function decodeUtf8(buffer: Uint8Array, verb: 'read' | 'edit', displayPath: string): string {
|
||||
try {
|
||||
return new TextDecoder('utf-8', { fatal: true }).decode(buffer)
|
||||
} catch (error: unknown) {
|
||||
/* v8 ignore next 2 -- TextDecoder({fatal}) only throws TypeError on invalid bytes; any other throw is an unreachable runtime fault. */
|
||||
if (!(error instanceof TypeError)) throw error
|
||||
throw notTextError(verb, displayPath)
|
||||
}
|
||||
}
|
||||
|
||||
function decodeUtf8Stream(
|
||||
decoder: TextDecoder,
|
||||
chunk: Uint8Array | undefined,
|
||||
verb: 'read' | 'edit',
|
||||
displayPath: string,
|
||||
): string {
|
||||
try {
|
||||
return chunk ? decoder.decode(chunk, { stream: true }) : decoder.decode()
|
||||
} catch (error: unknown) {
|
||||
/* v8 ignore next 2 -- TextDecoder({fatal}) only throws TypeError on invalid bytes; any other throw is an unreachable runtime fault. */
|
||||
if (!(error instanceof TypeError)) throw error
|
||||
throw notTextError(verb, displayPath)
|
||||
}
|
||||
}
|
||||
|
||||
async function statRegularFile(target: LocalTarget, verb: 'read', signal?: AbortSignal): Promise<Stats> {
|
||||
throwIfAborted(signal, verb)
|
||||
let info: Stats
|
||||
try {
|
||||
info = await stat(target.targetKey)
|
||||
} catch (error: unknown) {
|
||||
/* v8 ignore next 2 -- a non-ENOENT stat failure needs a permission/IO fault; only the not-found path is reachable in tests. */
|
||||
if (!isENOENT(error)) throw error
|
||||
throw new FsError(`cannot ${verb} "${target.displayPath}": not found`, 'FS_NOT_FOUND')
|
||||
}
|
||||
if (!info.isFile()) throw new FsError(`cannot ${verb} "${target.displayPath}": not a regular file`, 'FS_NOT_REGULAR_FILE')
|
||||
return info
|
||||
}
|
||||
|
||||
/**
|
||||
* Read a whole regular UTF-8 text file into a single decoded string. Rejects
|
||||
* non-regular files, invalid UTF-8, and NUL-byte binary samples.
|
||||
*/
|
||||
export async function readWholeText(target: LocalTarget, signal?: AbortSignal): Promise<string> {
|
||||
await statRegularFile(target, 'read', signal)
|
||||
const raw = await readFileAbortable(target.targetKey, 'read', signal)
|
||||
throwIfAborted(signal, 'read')
|
||||
if (raw.subarray(0, BINARY_SAMPLE_BYTES).includes(0)) {
|
||||
throw new FsError(`cannot read "${target.displayPath}": binary file`, 'FS_NOT_TEXT')
|
||||
}
|
||||
return decodeUtf8(raw, 'read', target.displayPath)
|
||||
}
|
||||
|
||||
/**
|
||||
* Stream a whole regular UTF-8 text file as decoded text chunks. Same text
|
||||
* semantics as {@link readWholeText} (regular-file check, binary/NUL rejection,
|
||||
* cross-chunk UTF-8 decoding), but never holds the whole file in memory.
|
||||
*/
|
||||
export async function* streamWholeText(target: LocalTarget, signal?: AbortSignal): AsyncIterable<string> {
|
||||
await statRegularFile(target, 'read', signal)
|
||||
const stream = createReadStream(target.targetKey, signal ? { signal } : {})
|
||||
const decoder = new TextDecoder('utf-8', { fatal: true })
|
||||
let sampledBytes = 0
|
||||
|
||||
function scanBinarySample(chunk: Buffer): void {
|
||||
if (sampledBytes >= BINARY_SAMPLE_BYTES) return
|
||||
const sample = chunk.subarray(0, Math.min(chunk.length, BINARY_SAMPLE_BYTES - sampledBytes))
|
||||
if (sample.includes(0)) {
|
||||
throw new FsError(`cannot read "${target.displayPath}": binary file`, 'FS_NOT_TEXT')
|
||||
}
|
||||
sampledBytes += sample.length
|
||||
}
|
||||
|
||||
try {
|
||||
for await (const chunk of stream as AsyncIterable<Buffer>) {
|
||||
scanBinarySample(chunk)
|
||||
yield decodeUtf8Stream(decoder, chunk, 'read', target.displayPath)
|
||||
}
|
||||
yield decodeUtf8Stream(decoder, undefined, 'read', target.displayPath)
|
||||
} catch (error: unknown) {
|
||||
/* v8 ignore next 4 -- mid-stream errors need an abort/IO fault racing the loop; pre-abort is caught by throwIfAborted. */
|
||||
if (isAbortError(error)) throw new FsError('read aborted', 'FS_ABORTED')
|
||||
throw error
|
||||
}
|
||||
}
|
||||
|
||||
// --- Writing ---
|
||||
|
||||
async function removeStagingDirOrThrow(stagingDir: string, originalError: unknown): Promise<never> {
|
||||
try {
|
||||
await rm(stagingDir, { recursive: true, force: true })
|
||||
} catch (cleanupError: unknown) {
|
||||
/* v8 ignore next 1 -- cleanup failure here needs a second filesystem fault after the primary write failure. */
|
||||
throw new FsError(`write failed (${errorMessage(originalError)}) and temp cleanup failed (${errorMessage(cleanupError)})`, 'FS_NOT_FOUND', { cause: originalError })
|
||||
}
|
||||
throw originalError
|
||||
}
|
||||
|
||||
/**
|
||||
* Atomically write `content` to `absolutePath`: create parent dirs, write to a
|
||||
* randomly-named temp file opened exclusively (`wx`, `0o600`) inside a private
|
||||
* (`0o700`) staging directory, fsync, optionally chmod to the final mode while
|
||||
* still private, then rename over the target. `mode` (when given) preserves an
|
||||
* existing file's permissions across the replace.
|
||||
*/
|
||||
export async function writeFileAtomic(
|
||||
absolutePath: string,
|
||||
content: string,
|
||||
mode: number | undefined,
|
||||
signal: AbortSignal | undefined,
|
||||
internals: FsIoInternals = {},
|
||||
): Promise<void> {
|
||||
throwIfAborted(signal, 'write')
|
||||
const directory = dirname(absolutePath)
|
||||
await mkdir(directory, { recursive: true })
|
||||
|
||||
throwIfAborted(signal, 'write')
|
||||
const stagingDirName = internals.tempDirName?.(absolutePath) ?? `.${basename(absolutePath)}.${process.pid}.${randomUUID()}.tmpdir`
|
||||
const stagingDir = join(directory, stagingDirName)
|
||||
const tempName = internals.tempName?.(absolutePath) ?? `${basename(absolutePath)}.tmp`
|
||||
const tempPath = join(stagingDir, tempName)
|
||||
let handle: Awaited<ReturnType<typeof open>> | undefined
|
||||
let stagingCreated = false
|
||||
try {
|
||||
await mkdir(stagingDir, { mode: 0o700 })
|
||||
stagingCreated = true
|
||||
await chmod(stagingDir, 0o700)
|
||||
|
||||
handle = await open(tempPath, 'wx', 0o600)
|
||||
await handle.chmod(0o600)
|
||||
await handle.writeFile(content, { encoding: 'utf8', ...signal ? { signal } : {} })
|
||||
await handle.sync()
|
||||
await internals.inspectTemp?.({ stagingDir, tempPath })
|
||||
if (mode !== undefined) await handle.chmod(mode)
|
||||
await handle.close()
|
||||
handle = undefined
|
||||
|
||||
throwIfAborted(signal, 'write')
|
||||
await rename(tempPath, absolutePath)
|
||||
await rm(stagingDir, { recursive: true, force: true })
|
||||
} catch (error: unknown) {
|
||||
/* v8 ignore next -- abort-mid-write needs a writeFile/signal race; the non-abort (rename/open) side is tested. */
|
||||
let failure: unknown = isAbortError(error) ? new FsError('write aborted', 'FS_ABORTED') : error
|
||||
/* v8 ignore next 8 -- reached only if writeFile/sync throws with the handle open (IO fault); close-failure is a double fault. */
|
||||
if (handle) {
|
||||
try {
|
||||
await handle.close()
|
||||
} catch (closeError: unknown) {
|
||||
failure = new FsError(`write failed (${errorMessage(failure)}) and temp close failed (${errorMessage(closeError)})`, 'FS_NOT_FOUND', { cause: failure })
|
||||
}
|
||||
}
|
||||
if (!stagingCreated) throw failure
|
||||
return removeStagingDirOrThrow(stagingDir, failure)
|
||||
}
|
||||
}
|
||||
|
||||
// --- Editing ---
|
||||
|
||||
/** Line ending style detected before LF normalization. */
|
||||
export type LineEndings = 'LF' | 'CRLF'
|
||||
|
||||
function normalizeLineEndings(content: string): string {
|
||||
return content.replaceAll('\r\n', '\n')
|
||||
}
|
||||
|
||||
function detectLineEndings(raw: string): LineEndings {
|
||||
const sample = raw.slice(0, 4096)
|
||||
const crlfCount = sample.split('\r\n').length - 1
|
||||
const lfCount = sample.split('\n').length - 1 - crlfCount
|
||||
return crlfCount > lfCount ? 'CRLF' : 'LF'
|
||||
}
|
||||
|
||||
function restoreLineEndings(content: string, lineEndings: LineEndings): string {
|
||||
return lineEndings === 'LF' ? content : normalizeLineEndings(content).split('\n').join('\r\n')
|
||||
}
|
||||
|
||||
function countOccurrences(content: string, needle: string): number {
|
||||
let count = 0
|
||||
let index = 0
|
||||
while (true) {
|
||||
const found = content.indexOf(needle, index)
|
||||
if (found === -1) return count
|
||||
count += 1
|
||||
index = found + needle.length
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Read and decode a file for editing: rejects binaries, returns LF-normalized
|
||||
* content plus the original line-ending style for write-back.
|
||||
*/
|
||||
export async function readForEdit(
|
||||
absolutePath: string,
|
||||
displayPath: string,
|
||||
signal?: AbortSignal,
|
||||
): Promise<{ content: string; lineEndings: LineEndings }> {
|
||||
throwIfAborted(signal, 'edit')
|
||||
const buffer = await readFileAbortable(absolutePath, 'edit', signal)
|
||||
throwIfAborted(signal, 'edit')
|
||||
if (buffer.includes(0)) throw new FsError(`cannot edit "${displayPath}": binary file`, 'FS_NOT_TEXT')
|
||||
const raw = decodeUtf8(buffer, 'edit', displayPath)
|
||||
return { content: normalizeLineEndings(raw), lineEndings: detectLineEndings(raw) }
|
||||
}
|
||||
|
||||
/**
|
||||
* Apply a literal replacement to LF-normalized content. Throws
|
||||
* `FS_EDIT_NOT_FOUND` on empty `oldString` or zero matches and
|
||||
* `FS_AMBIGUOUS_EDIT` on multiple matches when `replaceAll` is false. Returns
|
||||
* the edited content (still LF-normalized) and the replacement count.
|
||||
*/
|
||||
export function applyLiteralEdit(
|
||||
content: string,
|
||||
oldString: string,
|
||||
newString: string,
|
||||
replaceAll: boolean,
|
||||
displayPath: string,
|
||||
): { content: string; replacements: number } {
|
||||
const oldNorm = normalizeLineEndings(oldString)
|
||||
if (oldNorm.length === 0) {
|
||||
throw new FsError('old_string must be a non-empty string', 'FS_EDIT_NOT_FOUND')
|
||||
}
|
||||
const newNorm = normalizeLineEndings(newString)
|
||||
const replacements = countOccurrences(content, oldNorm)
|
||||
if (replacements === 0) {
|
||||
throw new FsError(`old_string was not found in "${displayPath}"`, 'FS_EDIT_NOT_FOUND')
|
||||
}
|
||||
if (!replaceAll && replacements > 1) {
|
||||
throw new FsError(`old_string matched ${replacements} times in "${displayPath}"; provide a more specific old_string or set replace_all to true`, 'FS_AMBIGUOUS_EDIT')
|
||||
}
|
||||
return { content: content.split(oldNorm).join(newNorm), replacements }
|
||||
}
|
||||
|
||||
export { restoreLineEndings }
|
||||
@@ -0,0 +1,198 @@
|
||||
/**
|
||||
* Local-filesystem implementation of the `ctx.fs` provider seam.
|
||||
* {@link LocalFileSystem} subclasses {@link FileSystem} and backs the six
|
||||
* text-storage primitives with the host filesystem via
|
||||
* {@link module:@deepseek-ai/dsh-fs-local/fsio}. Path resolution uses
|
||||
* `realpath`, so the stable `targetKey` is the real file identity (two input
|
||||
* paths reaching the same file through symlinks share one key, and writes land
|
||||
* on the link target — preserving the link).
|
||||
*
|
||||
* Future sandboxed/remote/virtual backends are sibling packages implementing
|
||||
* the same interface; loading this one populates `ctx.fs`.
|
||||
*
|
||||
* @module @deepseek-ai/dsh-fs-local
|
||||
*/
|
||||
|
||||
import { Context } from 'cordis'
|
||||
import z from 'schemastery'
|
||||
import { FileSystem, FsError, FsVersion } from '@deepseek-ai/dsh-fs'
|
||||
import type {
|
||||
FsEditOutcome,
|
||||
FsEditRequest,
|
||||
FsInfo,
|
||||
FsTarget,
|
||||
FsWriteIntent,
|
||||
FsWriteOutcome,
|
||||
} from '@deepseek-ai/dsh-fs'
|
||||
import {
|
||||
applyLiteralEdit,
|
||||
probe,
|
||||
readForEdit,
|
||||
readWholeText,
|
||||
resolveLocalTarget,
|
||||
restoreLineEndings,
|
||||
streamWholeText,
|
||||
writeFileAtomic,
|
||||
} from './fsio.ts'
|
||||
import type { FsIoInternals } from './fsio.ts'
|
||||
|
||||
export {
|
||||
STREAM_MIN_SIZE,
|
||||
applyLiteralEdit,
|
||||
probe,
|
||||
readForEdit,
|
||||
readWholeText,
|
||||
resolveLocalTarget,
|
||||
restoreLineEndings,
|
||||
streamWholeText,
|
||||
writeFileAtomic,
|
||||
} from './fsio.ts'
|
||||
export type { FsIoInternals, LineEndings, LocalTarget, PathInfo } from './fsio.ts'
|
||||
|
||||
/** Configuration for the local filesystem backend. */
|
||||
export interface Config {
|
||||
/** Base directory for relative paths. Defaults to `process.cwd()`. */
|
||||
cwd?: string
|
||||
}
|
||||
|
||||
type ResolvedConfig = Required<Config>
|
||||
|
||||
/**
|
||||
* The host-filesystem backend. Reads resolve relative paths from {@link Config.cwd}
|
||||
* (a resolution default, NOT a containment boundary — see the filesystem
|
||||
* capability-seam RFC); enforce
|
||||
* containment with a stricter backend or a `tools/execute` permission plugin.
|
||||
*/
|
||||
export class LocalFileSystem extends FileSystem {
|
||||
static Config: z<Config> = z.object({
|
||||
cwd: z.string().default(process.cwd()),
|
||||
})
|
||||
|
||||
readonly config: ResolvedConfig
|
||||
/** Test seam forwarded to fsio (force streaming path, pin temp names). */
|
||||
internals: FsIoInternals = {}
|
||||
/** Per-targetKey tail promise: serializes mutating ops so the read→guard→write
|
||||
* window can't interleave, making concurrent writes/edits deterministically
|
||||
* ordered (one wins, the rest see the new version and reject as stale). */
|
||||
private locks = new Map<string, Promise<unknown>>()
|
||||
|
||||
constructor(ctx: Context, config: Config) {
|
||||
super(ctx)
|
||||
this.config = config as ResolvedConfig
|
||||
}
|
||||
|
||||
/** Run `op` with exclusive access to `targetKey` (FIFO per key). */
|
||||
private async withLock<T>(targetKey: string, op: () => Promise<T>): Promise<T> {
|
||||
const prior = this.locks.get(targetKey) ?? Promise.resolve()
|
||||
const run = prior.then(op, op)
|
||||
// Keep the chain alive but swallow this op's result/throw for the *next* waiter.
|
||||
const tail = run.then(() => undefined, () => undefined)
|
||||
this.locks.set(targetKey, tail)
|
||||
try {
|
||||
return await run
|
||||
} finally {
|
||||
if (this.locks.get(targetKey) === tail) {
|
||||
this.locks.delete(targetKey)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
override async resolve(path: string, opts?: { cwd?: string }): Promise<FsTarget> {
|
||||
const local = await resolveLocalTarget(opts?.cwd ?? this.config.cwd, path)
|
||||
return { inputPath: path, targetKey: local.targetKey, displayPath: local.displayPath }
|
||||
}
|
||||
|
||||
override async stat(target: FsTarget, signal?: AbortSignal): Promise<FsInfo | undefined> {
|
||||
if (signal?.aborted) throw new FsError('stat aborted', 'FS_ABORTED')
|
||||
const info = await probe(target.targetKey)
|
||||
if (!info) return undefined
|
||||
return { version: info.version, type: info.type, size: info.size }
|
||||
}
|
||||
|
||||
override async readText(target: FsTarget, signal?: AbortSignal): Promise<string> {
|
||||
return readWholeText({ displayPath: target.displayPath, targetKey: target.targetKey }, signal)
|
||||
}
|
||||
|
||||
override streamText(target: FsTarget, signal?: AbortSignal): Promise<AsyncIterable<string>> {
|
||||
return Promise.resolve(streamWholeText({ displayPath: target.displayPath, targetKey: target.targetKey }, signal))
|
||||
}
|
||||
|
||||
override async writeText(
|
||||
target: FsTarget,
|
||||
content: string,
|
||||
expected?: FsWriteIntent,
|
||||
signal?: AbortSignal,
|
||||
): Promise<FsWriteOutcome> {
|
||||
return this.withLock(target.targetKey, async () => {
|
||||
const existing = await probe(target.targetKey)
|
||||
if (existing && existing.type !== 'file') {
|
||||
throw new FsError(`cannot write "${target.displayPath}": not a regular file`, 'FS_NOT_REGULAR_FILE')
|
||||
}
|
||||
|
||||
if (expected?.kind === 'replaceIfVersion') {
|
||||
// Stale guard: the file must still exist at the version the owner observed.
|
||||
if (!existing) throw new FsError(`cannot write "${target.displayPath}": file no longer exists`, 'FS_STALE_VERSION')
|
||||
if (existing.version !== expected.version) {
|
||||
throw new FsError(`cannot write "${target.displayPath}": file changed since it was read`, 'FS_STALE_VERSION')
|
||||
}
|
||||
} else if (expected?.kind === 'createIfAbsent' && existing) {
|
||||
// createIfAbsent onto an existing file: a blind overwrite — require a read first.
|
||||
throw new FsError(`cannot overwrite existing "${target.displayPath}" without reading it first`, 'FS_NOT_OBSERVED')
|
||||
}
|
||||
// expected === undefined: unconditional create-or-overwrite (the bare
|
||||
// provider) — no version guard, no read-first requirement. Still atomic
|
||||
// (the per-target lock is unconditional), so the write is never torn.
|
||||
|
||||
await writeFileAtomic(target.targetKey, content, existing?.mode, signal, this.internals)
|
||||
const after = await probe(target.targetKey)
|
||||
return {
|
||||
operation: existing ? 'update' : 'create',
|
||||
version: this.versionAfterWrite(after, target),
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
override async editText(
|
||||
target: FsTarget,
|
||||
edit: FsEditRequest,
|
||||
expected?: { version: FsVersion },
|
||||
signal?: AbortSignal,
|
||||
): Promise<FsEditOutcome> {
|
||||
return this.withLock(target.targetKey, async () => {
|
||||
const existing = await probe(target.targetKey)
|
||||
// Stale guard BEFORE literal matching: an edit based on an old read reports
|
||||
// FS_STALE_VERSION, not FS_EDIT_NOT_FOUND/FS_AMBIGUOUS_EDIT against newer content.
|
||||
// A missing target reports FS_STALE_VERSION on BOTH paths (guarded and
|
||||
// unconditional) — one "cannot edit this target now" code.
|
||||
if (!existing) throw new FsError(`cannot edit "${target.displayPath}": file changed since it was read`, 'FS_STALE_VERSION')
|
||||
if (existing.type !== 'file') throw new FsError(`cannot edit "${target.displayPath}": not a regular file`, 'FS_NOT_REGULAR_FILE')
|
||||
// expected === undefined: unconditional edit of the current content — no
|
||||
// version guard. Still inside the per-target lock, so the read→match→write
|
||||
// window is serialized and atomic.
|
||||
if (expected && existing.version !== expected.version) {
|
||||
throw new FsError(`cannot edit "${target.displayPath}": file changed since it was read`, 'FS_STALE_VERSION')
|
||||
}
|
||||
|
||||
const original = await readForEdit(target.targetKey, target.displayPath, signal)
|
||||
const edited = applyLiteralEdit(original.content, edit.oldString, edit.newString, edit.replaceAll, target.displayPath)
|
||||
const content = restoreLineEndings(edited.content, original.lineEndings)
|
||||
await writeFileAtomic(target.targetKey, content, existing.mode, signal, this.internals)
|
||||
|
||||
const after = await probe(target.targetKey)
|
||||
return {
|
||||
replacements: edited.replacements,
|
||||
replaceAll: edit.replaceAll,
|
||||
version: this.versionAfterWrite(after, target),
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
/* v8 ignore next 5 -- the post-write probe finding the file absent requires a
|
||||
* concurrent unlink between rename and stat; fall back to a sentinel version. */
|
||||
private versionAfterWrite(after: { version: FsVersion } | null, target: FsTarget): FsVersion {
|
||||
if (after) return after.version
|
||||
return FsVersion(`missing:${target.targetKey}`)
|
||||
}
|
||||
}
|
||||
|
||||
export default LocalFileSystem
|
||||
@@ -0,0 +1,405 @@
|
||||
/**
|
||||
* Tests for the local backend through the `ctx.fs` provider seam: stat, whole-
|
||||
* file/streamed text reads, atomic guarded writes (createIfAbsent /
|
||||
* replaceIfVersion), version-guarded literal edits, concurrency races, symlink
|
||||
* identity, and HMR/disposal. Read WINDOWING is policy and lives in
|
||||
* `dsh-fs-policy`, so it is not exercised here.
|
||||
*/
|
||||
|
||||
import { afterEach, beforeEach, describe, expect, it } from 'vitest'
|
||||
import { mkdtemp, readFile, rm, stat, symlink, writeFile, unlink } from 'node:fs/promises'
|
||||
import { tmpdir } from 'node:os'
|
||||
import { join } from 'node:path'
|
||||
import { Context } from 'cordis'
|
||||
import { LocalFileSystem } from '@deepseek-ai/dsh-fs-local'
|
||||
import { FsVersion } from '@deepseek-ai/dsh-fs'
|
||||
import type { FsTarget } from '@deepseek-ai/dsh-fs'
|
||||
|
||||
let dir: string
|
||||
let ctx: Context
|
||||
let fs: LocalFileSystem
|
||||
let fiber: Awaited<ReturnType<Context['plugin']>>
|
||||
|
||||
beforeEach(async () => {
|
||||
dir = await mkdtemp(join(tmpdir(), 'dsh-fs-'))
|
||||
ctx = new Context()
|
||||
fiber = await ctx.plugin(LocalFileSystem, { cwd: dir })
|
||||
fs = ctx.fs as LocalFileSystem
|
||||
})
|
||||
afterEach(async () => {
|
||||
await fiber.dispose()
|
||||
await rm(dir, { recursive: true, force: true })
|
||||
})
|
||||
|
||||
function lockCount(localFs: LocalFileSystem): number {
|
||||
return (localFs as unknown as { locks: Map<string, Promise<unknown>> }).locks.size
|
||||
}
|
||||
|
||||
/** The version the backend currently reports for a resolved target. */
|
||||
async function versionOf(target: FsTarget): Promise<FsVersion> {
|
||||
const info = await fs.stat(target)
|
||||
if (!info) throw new Error('expected target to exist')
|
||||
return info.version
|
||||
}
|
||||
|
||||
describe('registration', () => {
|
||||
it('registers LocalFileSystem as ctx.fs with a default cwd', async () => {
|
||||
const bare = new Context()
|
||||
const bareFiber = await bare.plugin(LocalFileSystem)
|
||||
expect((bare.fs as LocalFileSystem).config.cwd).toBe(process.cwd())
|
||||
await bareFiber.dispose()
|
||||
})
|
||||
})
|
||||
|
||||
describe('resolve', () => {
|
||||
it('resolves a relative path against opts.cwd, not config.cwd', async () => {
|
||||
// config.cwd is `dir`; a call supplying a DIFFERENT cwd bases the relative
|
||||
// path there (the per-session-workspace seam — mirrors tool-bash workdir).
|
||||
const other = await mkdtemp(join(tmpdir(), 'dsh-fs-other-'))
|
||||
try {
|
||||
await writeFile(join(other, 'x.txt'), 'in other')
|
||||
const viaOther = await fs.resolve('x.txt', { cwd: other })
|
||||
expect(await fs.readText(viaOther)).toBe('in other')
|
||||
// Same relative path with no opts falls back to config.cwd (= dir), where
|
||||
// x.txt does not exist.
|
||||
await expect(fs.readText(await fs.resolve('x.txt'))).rejects.toMatchObject({ code: 'FS_NOT_FOUND' })
|
||||
} finally {
|
||||
await rm(other, { recursive: true, force: true })
|
||||
}
|
||||
})
|
||||
|
||||
it('ignores opts.cwd for an ABSOLUTE path', async () => {
|
||||
await writeFile(join(dir, 'abs.txt'), 'absolute')
|
||||
const target = await fs.resolve(join(dir, 'abs.txt'), { cwd: '/nonexistent-base' })
|
||||
expect(await fs.readText(target)).toBe('absolute')
|
||||
})
|
||||
})
|
||||
|
||||
describe('stat', () => {
|
||||
it('returns file metadata, directory type, and undefined for absent', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'hello')
|
||||
const fileInfo = await fs.stat(await fs.resolve('a.txt'))
|
||||
expect(fileInfo?.type).toBe('file')
|
||||
expect(fileInfo?.size).toBe(5)
|
||||
expect(typeof fileInfo?.version).toBe('string')
|
||||
|
||||
expect((await fs.stat(await fs.resolve('.')))?.type).toBe('directory')
|
||||
expect(await fs.stat(await fs.resolve('missing.txt'))).toBeUndefined()
|
||||
})
|
||||
|
||||
it('honors a pre-aborted signal', async () => {
|
||||
await expect(fs.stat(await fs.resolve('a.txt'), AbortSignal.abort())).rejects.toMatchObject({ code: 'FS_ABORTED' })
|
||||
})
|
||||
})
|
||||
|
||||
describe('readText / streamText', () => {
|
||||
it('reads whole-file text', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'one\ntwo\nthree')
|
||||
expect(await fs.readText(await fs.resolve('a.txt'))).toBe('one\ntwo\nthree')
|
||||
})
|
||||
|
||||
it('streams the same text', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'one\ntwo\nthree')
|
||||
const target = await fs.resolve('a.txt')
|
||||
let streamed = ''
|
||||
for await (const chunk of await fs.streamText(target)) streamed += chunk
|
||||
expect(streamed).toBe('one\ntwo\nthree')
|
||||
})
|
||||
|
||||
it('rejects a missing file, a directory, binary, and invalid UTF-8', async () => {
|
||||
await expect(fs.readText(await fs.resolve('nope'))).rejects.toMatchObject({ code: 'FS_NOT_FOUND' })
|
||||
await expect(fs.readText(await fs.resolve('.'))).rejects.toMatchObject({ code: 'FS_NOT_REGULAR_FILE' })
|
||||
|
||||
await writeFile(join(dir, 'bin'), Buffer.from([0x68, 0x00, 0x69]))
|
||||
await expect(fs.readText(await fs.resolve('bin'))).rejects.toMatchObject({ code: 'FS_NOT_TEXT' })
|
||||
|
||||
await writeFile(join(dir, 'bad'), Buffer.from([0x68, 0xff, 0x69]))
|
||||
await expect(fs.readText(await fs.resolve('bad'))).rejects.toMatchObject({ code: 'FS_NOT_TEXT' })
|
||||
})
|
||||
})
|
||||
|
||||
describe('writeText', () => {
|
||||
it('createIfAbsent creates a new file', async () => {
|
||||
const target = await fs.resolve('new.txt')
|
||||
const outcome = await fs.writeText(target, 'fresh', { kind: 'createIfAbsent' })
|
||||
expect(outcome.operation).toBe('create')
|
||||
expect(await readFile(join(dir, 'new.txt'), 'utf8')).toBe('fresh')
|
||||
})
|
||||
|
||||
it('createIfAbsent rejects an existing file as FS_NOT_OBSERVED', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'old')
|
||||
const target = await fs.resolve('a.txt')
|
||||
await expect(fs.writeText(target, 'new', { kind: 'createIfAbsent' }))
|
||||
.rejects.toMatchObject({ code: 'FS_NOT_OBSERVED' })
|
||||
expect(await readFile(join(dir, 'a.txt'), 'utf8')).toBe('old')
|
||||
})
|
||||
|
||||
it('replaceIfVersion replaces when the version matches', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'old')
|
||||
const target = await fs.resolve('a.txt')
|
||||
const outcome = await fs.writeText(target, 'new', { kind: 'replaceIfVersion', version: await versionOf(target) })
|
||||
expect(outcome.operation).toBe('update')
|
||||
expect(await readFile(join(dir, 'a.txt'), 'utf8')).toBe('new')
|
||||
})
|
||||
|
||||
it('replaceIfVersion rejects a stale version', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'v1')
|
||||
const target = await fs.resolve('a.txt')
|
||||
const stale = await versionOf(target)
|
||||
await writeFile(join(dir, 'a.txt'), 'changed-externally')
|
||||
await expect(fs.writeText(target, 'v2', { kind: 'replaceIfVersion', version: stale }))
|
||||
.rejects.toMatchObject({ code: 'FS_STALE_VERSION' })
|
||||
})
|
||||
|
||||
it('replaceIfVersion rejects a deleted target as stale, without recreating it', async () => {
|
||||
const path = join(dir, 'a.txt')
|
||||
await writeFile(path, 'v1')
|
||||
const target = await fs.resolve('a.txt')
|
||||
const version = await versionOf(target)
|
||||
await unlink(path)
|
||||
await expect(fs.writeText(target, 'v2', { kind: 'replaceIfVersion', version }))
|
||||
.rejects.toMatchObject({ code: 'FS_STALE_VERSION' })
|
||||
await expect(stat(path)).rejects.toMatchObject({ code: 'ENOENT' })
|
||||
})
|
||||
|
||||
it('rejects writing onto a directory', async () => {
|
||||
const target = await fs.resolve('.')
|
||||
await expect(fs.writeText(target, 'x', { kind: 'createIfAbsent' }))
|
||||
.rejects.toMatchObject({ code: 'FS_NOT_REGULAR_FILE' })
|
||||
})
|
||||
|
||||
it('unconditionally creates a new file with no expectation (bare provider)', async () => {
|
||||
const target = await fs.resolve('new.txt')
|
||||
const outcome = await fs.writeText(target, 'fresh')
|
||||
expect(outcome.operation).toBe('create')
|
||||
expect(await readFile(join(dir, 'new.txt'), 'utf8')).toBe('fresh')
|
||||
})
|
||||
|
||||
it('unconditionally OVERWRITES an existing file with no expectation (bare provider)', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'old')
|
||||
const target = await fs.resolve('a.txt')
|
||||
const outcome = await fs.writeText(target, 'clobbered')
|
||||
expect(outcome.operation).toBe('update')
|
||||
expect(await readFile(join(dir, 'a.txt'), 'utf8')).toBe('clobbered')
|
||||
})
|
||||
|
||||
it('rejects writing onto a directory even with no expectation', async () => {
|
||||
const target = await fs.resolve('.')
|
||||
await expect(fs.writeText(target, 'x')).rejects.toMatchObject({ code: 'FS_NOT_REGULAR_FILE' })
|
||||
})
|
||||
|
||||
it('releases per-target mutation locks after success and failure', async () => {
|
||||
const target = await fs.resolve('a.txt')
|
||||
await fs.writeText(target, 'created', { kind: 'createIfAbsent' })
|
||||
expect(lockCount(fs)).toBe(0)
|
||||
await expect(fs.writeText(target, 'again', { kind: 'createIfAbsent' }))
|
||||
.rejects.toMatchObject({ code: 'FS_NOT_OBSERVED' })
|
||||
expect(lockCount(fs)).toBe(0)
|
||||
})
|
||||
|
||||
it('replaceIfVersion returns the post-write version (matches a fresh stat)', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'v1')
|
||||
const target = await fs.resolve('a.txt')
|
||||
const before = await versionOf(target)
|
||||
// Change the byte length so the mtimeMs:size token provably differs (a
|
||||
// same-size same-tick rewrite can collide — the documented version-token
|
||||
// limitation; not what this test is about).
|
||||
const outcome = await fs.writeText(target, 'a much longer replacement body', { kind: 'replaceIfVersion', version: before })
|
||||
expect(outcome.version).not.toBe(before)
|
||||
expect(outcome.version).toBe(await versionOf(target))
|
||||
})
|
||||
|
||||
it('honors a pre-aborted signal without creating the file', async () => {
|
||||
const target = await fs.resolve('aborted.txt')
|
||||
await expect(fs.writeText(target, 'x', undefined, AbortSignal.abort()))
|
||||
.rejects.toMatchObject({ code: 'FS_ABORTED' })
|
||||
await expect(stat(join(dir, 'aborted.txt'))).rejects.toMatchObject({ code: 'ENOENT' })
|
||||
expect(lockCount(fs)).toBe(0)
|
||||
})
|
||||
|
||||
it('two concurrent guarded writes: one updates, the other is rejected as stale', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'base')
|
||||
const target = await fs.resolve('a.txt')
|
||||
const version = await versionOf(target)
|
||||
const results = await Promise.allSettled([
|
||||
fs.writeText(target, 'one', { kind: 'replaceIfVersion', version }),
|
||||
fs.writeText(target, 'two', { kind: 'replaceIfVersion', version }),
|
||||
])
|
||||
expect(results.filter(r => r.status === 'fulfilled')).toHaveLength(1)
|
||||
const rejected = results.filter(r => r.status === 'rejected')
|
||||
expect(rejected).toHaveLength(1)
|
||||
expect((rejected[0] as PromiseRejectedResult).reason).toMatchObject({ code: 'FS_STALE_VERSION' })
|
||||
expect(lockCount(fs)).toBe(0)
|
||||
})
|
||||
})
|
||||
|
||||
describe('editText', () => {
|
||||
it('applies a literal edit at the matching version', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'hello world')
|
||||
const target = await fs.resolve('a.txt')
|
||||
const outcome = await fs.editText(target, { oldString: 'world', newString: 'there', replaceAll: false }, { version: await versionOf(target) })
|
||||
expect(outcome.replacements).toBe(1)
|
||||
expect(await readFile(join(dir, 'a.txt'), 'utf8')).toBe('hello there')
|
||||
})
|
||||
|
||||
it('checks the stale version BEFORE literal matching', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'hello world')
|
||||
const target = await fs.resolve('a.txt')
|
||||
const stale = await versionOf(target)
|
||||
// Change the file so 'world' is gone — a stale edit must report STALE, not NOT_FOUND.
|
||||
await writeFile(join(dir, 'a.txt'), 'goodbye')
|
||||
await expect(fs.editText(target, { oldString: 'world', newString: 'there', replaceAll: false }, { version: stale }))
|
||||
.rejects.toMatchObject({ code: 'FS_STALE_VERSION' })
|
||||
})
|
||||
|
||||
it('unconditionally edits the current content with no expectation (bare provider)', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'hello world')
|
||||
const target = await fs.resolve('a.txt')
|
||||
// No version guard: any current content is edited, regardless of version.
|
||||
const outcome = await fs.editText(target, { oldString: 'world', newString: 'there', replaceAll: false })
|
||||
expect(outcome.replacements).toBe(1)
|
||||
expect(await readFile(join(dir, 'a.txt'), 'utf8')).toBe('hello there')
|
||||
})
|
||||
|
||||
it('reports a missing target as FS_STALE_VERSION even with no expectation (bare provider)', async () => {
|
||||
const target = await fs.resolve('missing.txt')
|
||||
await expect(fs.editText(target, { oldString: 'a', newString: 'b', replaceAll: false }))
|
||||
.rejects.toMatchObject({ code: 'FS_STALE_VERSION' })
|
||||
})
|
||||
|
||||
it('still reports literal-match codes with no expectation (FS_EDIT_NOT_FOUND, unrelated to freshness)', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'hello world')
|
||||
const target = await fs.resolve('a.txt')
|
||||
await expect(fs.editText(target, { oldString: 'absent', newString: 'x', replaceAll: false }))
|
||||
.rejects.toMatchObject({ code: 'FS_EDIT_NOT_FOUND' })
|
||||
})
|
||||
|
||||
it('rejects a deleted target as stale (before matching)', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'hello')
|
||||
const target = await fs.resolve('a.txt')
|
||||
const version = await versionOf(target)
|
||||
await unlink(join(dir, 'a.txt'))
|
||||
await expect(fs.editText(target, { oldString: 'hello', newString: 'bye', replaceAll: false }, { version }))
|
||||
.rejects.toMatchObject({ code: 'FS_STALE_VERSION' })
|
||||
})
|
||||
|
||||
it('rejects a non-regular target', async () => {
|
||||
const target = await fs.resolve('.')
|
||||
await expect(fs.editText(target, { oldString: 'a', newString: 'b', replaceAll: false }, { version: FsVersion('v') }))
|
||||
.rejects.toMatchObject({ code: 'FS_NOT_REGULAR_FILE' })
|
||||
})
|
||||
|
||||
it('rejects zero matches and ambiguous matches at the right version', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'a a a')
|
||||
const target = await fs.resolve('a.txt')
|
||||
const version = await versionOf(target)
|
||||
await expect(fs.editText(target, { oldString: 'z', newString: 'X', replaceAll: false }, { version }))
|
||||
.rejects.toMatchObject({ code: 'FS_EDIT_NOT_FOUND' })
|
||||
await expect(fs.editText(target, { oldString: 'a', newString: 'X', replaceAll: false }, { version }))
|
||||
.rejects.toMatchObject({ code: 'FS_AMBIGUOUS_EDIT' })
|
||||
})
|
||||
|
||||
it('replaces all matches with replaceAll', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'a a a')
|
||||
const target = await fs.resolve('a.txt')
|
||||
const outcome = await fs.editText(target, { oldString: 'a', newString: 'b', replaceAll: true }, { version: await versionOf(target) })
|
||||
expect(outcome.replacements).toBe(3)
|
||||
expect(await readFile(join(dir, 'a.txt'), 'utf8')).toBe('b b b')
|
||||
})
|
||||
|
||||
it('rejects invalid UTF-8 without rewriting the file', async () => {
|
||||
const path = join(dir, 'bad.txt')
|
||||
const bytes = Buffer.from([0x68, 0xff, 0x69])
|
||||
await writeFile(path, bytes)
|
||||
const target = await fs.resolve('bad.txt')
|
||||
const version = await versionOf(target)
|
||||
await expect(fs.editText(target, { oldString: 'h', newString: 'H', replaceAll: false }, { version }))
|
||||
.rejects.toMatchObject({ code: 'FS_NOT_TEXT' })
|
||||
expect(await readFile(path)).toEqual(bytes)
|
||||
})
|
||||
|
||||
it('two concurrent edits: one wins, the other is rejected as stale', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'base')
|
||||
const target = await fs.resolve('a.txt')
|
||||
const version = await versionOf(target)
|
||||
const results = await Promise.allSettled([
|
||||
fs.editText(target, { oldString: 'base', newString: 'one', replaceAll: false }, { version }),
|
||||
fs.editText(target, { oldString: 'base', newString: 'two', replaceAll: false }, { version }),
|
||||
])
|
||||
expect(results.filter(r => r.status === 'fulfilled')).toHaveLength(1)
|
||||
const rejected = results.filter(r => r.status === 'rejected')
|
||||
expect(rejected).toHaveLength(1)
|
||||
expect((rejected[0] as PromiseRejectedResult).reason).toMatchObject({ code: 'FS_STALE_VERSION' })
|
||||
expect(lockCount(fs)).toBe(0)
|
||||
})
|
||||
|
||||
it('honors a pre-aborted signal without rewriting the file', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'keep')
|
||||
const target = await fs.resolve('a.txt')
|
||||
await expect(fs.editText(target, { oldString: 'keep', newString: 'x', replaceAll: false }, undefined, AbortSignal.abort()))
|
||||
.rejects.toMatchObject({ code: 'FS_ABORTED' })
|
||||
expect(await readFile(join(dir, 'a.txt'), 'utf8')).toBe('keep')
|
||||
expect(lockCount(fs)).toBe(0)
|
||||
})
|
||||
|
||||
it('a successful edit refreshes the version so an immediate follow-up edit proceeds', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'one two')
|
||||
const target = await fs.resolve('a.txt')
|
||||
const first = await fs.editText(target, { oldString: 'one', newString: 'ONE', replaceAll: false }, { version: await versionOf(target) })
|
||||
// The version the first edit returned is a valid guard for a second edit —
|
||||
// no intervening re-stat needed.
|
||||
const second = await fs.editText(target, { oldString: 'two', newString: 'TWO', replaceAll: false }, { version: first.version })
|
||||
expect(second.replacements).toBe(1)
|
||||
expect(await readFile(join(dir, 'a.txt'), 'utf8')).toBe('ONE TWO')
|
||||
})
|
||||
|
||||
it('concurrent write vs edit at the same version: one wins, the other is stale', async () => {
|
||||
await writeFile(join(dir, 'a.txt'), 'base')
|
||||
const target = await fs.resolve('a.txt')
|
||||
const version = await versionOf(target)
|
||||
const results = await Promise.allSettled([
|
||||
fs.writeText(target, 'written', { kind: 'replaceIfVersion', version }),
|
||||
fs.editText(target, { oldString: 'base', newString: 'edited', replaceAll: false }, { version }),
|
||||
])
|
||||
expect(results.filter(r => r.status === 'fulfilled')).toHaveLength(1)
|
||||
const rejected = results.filter(r => r.status === 'rejected')
|
||||
expect(rejected).toHaveLength(1)
|
||||
expect((rejected[0] as PromiseRejectedResult).reason).toMatchObject({ code: 'FS_STALE_VERSION' })
|
||||
expect(lockCount(fs)).toBe(0)
|
||||
})
|
||||
})
|
||||
|
||||
describe('symlink targetKey identity', () => {
|
||||
it('two paths to the same file via a symlink share one version and write the real target', async () => {
|
||||
await writeFile(join(dir, 'real.txt'), 'hello')
|
||||
await symlink(join(dir, 'real.txt'), join(dir, 'link.txt'))
|
||||
const viaReal = await fs.resolve('real.txt')
|
||||
const viaLink = await fs.resolve('link.txt')
|
||||
expect(viaLink.targetKey).toBe(viaReal.targetKey)
|
||||
|
||||
const version = await versionOf(viaReal)
|
||||
await fs.editText(viaLink, { oldString: 'hello', newString: 'bye', replaceAll: false }, { version })
|
||||
expect(await readFile(join(dir, 'real.txt'), 'utf8')).toBe('bye') // link preserved
|
||||
})
|
||||
|
||||
it('a stale change is detected across both paths', async () => {
|
||||
await writeFile(join(dir, 'real.txt'), 'hello')
|
||||
await symlink(join(dir, 'real.txt'), join(dir, 'link.txt'))
|
||||
const viaReal = await fs.resolve('real.txt')
|
||||
const stale = await versionOf(viaReal)
|
||||
await writeFile(join(dir, 'real.txt'), 'changed')
|
||||
const viaLink = await fs.resolve('link.txt')
|
||||
await expect(fs.editText(viaLink, { oldString: 'hello', newString: 'bye', replaceAll: false }, { version: stale }))
|
||||
.rejects.toMatchObject({ code: 'FS_STALE_VERSION' })
|
||||
})
|
||||
})
|
||||
|
||||
describe('HMR / disposal', () => {
|
||||
it('disposing the fiber withdraws ctx.fs', async () => {
|
||||
const local = new Context()
|
||||
const localFiber = await local.plugin(LocalFileSystem, { cwd: dir })
|
||||
expect(local.fs).toBeDefined()
|
||||
await localFiber.dispose()
|
||||
expect(local.fs).toBeUndefined()
|
||||
})
|
||||
})
|
||||
@@ -0,0 +1,363 @@
|
||||
/**
|
||||
* Cordis-free tests for the raw local-filesystem I/O: path resolution, probe,
|
||||
* whole-file/streamed text reads, binary/UTF-8 rejection, atomic-write temp
|
||||
* safety, literal edit matching, and line-ending handling. Line WINDOWING is
|
||||
* policy and lives in `dsh-fs-policy`, so it is not tested here.
|
||||
*/
|
||||
|
||||
import { afterEach, beforeEach, describe, expect, it } from 'vitest'
|
||||
import { mkdtemp, readFile, rm, stat, symlink, writeFile, mkdir, readdir, realpath } from 'node:fs/promises'
|
||||
import { tmpdir } from 'node:os'
|
||||
import { join } from 'node:path'
|
||||
import { createServer } from 'node:net'
|
||||
import {
|
||||
applyLiteralEdit,
|
||||
probe,
|
||||
readForEdit,
|
||||
readWholeText,
|
||||
resolveLocalTarget,
|
||||
restoreLineEndings,
|
||||
streamWholeText,
|
||||
writeFileAtomic,
|
||||
} from '@deepseek-ai/dsh-fs-local'
|
||||
import type { LocalTarget } from '@deepseek-ai/dsh-fs-local'
|
||||
import { FsError, FsTargetKey } from '@deepseek-ai/dsh-fs'
|
||||
|
||||
let dir: string
|
||||
beforeEach(async () => {
|
||||
dir = await mkdtemp(join(tmpdir(), 'dsh-fsio-'))
|
||||
})
|
||||
afterEach(async () => {
|
||||
await rm(dir, { recursive: true, force: true })
|
||||
})
|
||||
|
||||
const localTarget = (path: string): LocalTarget => ({ displayPath: path, targetKey: FsTargetKey(path) })
|
||||
|
||||
async function collect(chunks: AsyncIterable<string>): Promise<string> {
|
||||
let out = ''
|
||||
for await (const chunk of chunks) out += chunk
|
||||
return out
|
||||
}
|
||||
|
||||
describe('resolveLocalTarget', () => {
|
||||
it('resolves a relative path from cwd and realpaths it', async () => {
|
||||
const file = join(dir, 'a.txt')
|
||||
await writeFile(file, 'hi')
|
||||
const target = await resolveLocalTarget(dir, 'a.txt')
|
||||
expect(target.displayPath).toBe(file)
|
||||
expect(target.targetKey).toBe(await realpath(file))
|
||||
})
|
||||
|
||||
it('uses the realpathed parent + basename when the file does not exist (stable across create)', async () => {
|
||||
const target = await resolveLocalTarget(dir, 'missing.txt')
|
||||
expect(target.targetKey).toBe(join(await realpath(dir), 'missing.txt'))
|
||||
})
|
||||
|
||||
it('two paths to the same file via a symlink share one targetKey', async () => {
|
||||
const real = join(dir, 'real.txt')
|
||||
await writeFile(real, 'hi')
|
||||
const link = join(dir, 'link.txt')
|
||||
await symlink(real, link)
|
||||
const viaReal = await resolveLocalTarget(dir, 'real.txt')
|
||||
const viaLink = await resolveLocalTarget(dir, 'link.txt')
|
||||
expect(viaLink.targetKey).toBe(viaReal.targetKey)
|
||||
expect(viaLink.displayPath).toBe(link)
|
||||
})
|
||||
|
||||
it('realpaths the nearest existing ancestor when intermediate dirs are missing', async () => {
|
||||
const target = await resolveLocalTarget(dir, 'no-such-dir/child.txt')
|
||||
expect(target.targetKey).toBe(join(await realpath(dir), 'no-such-dir', 'child.txt'))
|
||||
})
|
||||
|
||||
it('keeps the key stable across create when an ancestor is a symlink', async () => {
|
||||
// A symlinked workspace root with a not-yet-created subdirectory: the
|
||||
// pre-create key (via the symlink, missing parent) must equal the
|
||||
// post-create key (file exists, realpathed) so observed-state survives.
|
||||
const realRoot = join(dir, 'real-root')
|
||||
await mkdir(realRoot)
|
||||
const linkRoot = join(dir, 'link-root')
|
||||
await symlink(realRoot, linkRoot)
|
||||
|
||||
const before = await resolveLocalTarget(linkRoot, 'sub/file.txt')
|
||||
await mkdir(join(realRoot, 'sub'), { recursive: true })
|
||||
await writeFile(join(realRoot, 'sub', 'file.txt'), 'hi') // create through the real path
|
||||
const after = await resolveLocalTarget(linkRoot, 'sub/file.txt')
|
||||
expect(before.targetKey).toBe(after.targetKey)
|
||||
})
|
||||
|
||||
it('rejects a blank path', async () => {
|
||||
await expect(resolveLocalTarget(dir, ' ')).rejects.toMatchObject({ code: 'FS_NOT_FOUND' })
|
||||
})
|
||||
|
||||
it('rejects a path whose ancestor is a file with a structured FsError (ENOTDIR)', async () => {
|
||||
// "afile" is a regular file, so "afile/child.txt" hits ENOTDIR on realpath;
|
||||
// the raw Node error must be translated into the FsError taxonomy so the tool
|
||||
// result keeps its { name, code } metadata.
|
||||
await writeFile(join(dir, 'afile'), 'i am a file')
|
||||
const err = await resolveLocalTarget(dir, 'afile/child.txt').then(() => undefined, (e: unknown) => e)
|
||||
expect(err).toBeInstanceOf(FsError)
|
||||
expect(err).toMatchObject({ code: 'FS_NOT_FOUND' })
|
||||
})
|
||||
})
|
||||
|
||||
describe('probe', () => {
|
||||
it('returns null for a missing path and metadata for a file', async () => {
|
||||
expect(await probe(join(dir, 'nope'))).toBeNull()
|
||||
const file = join(dir, 'a.txt')
|
||||
await writeFile(file, 'hi')
|
||||
const info = await probe(file)
|
||||
expect(info?.type).toBe('file')
|
||||
expect(info?.size).toBe(2)
|
||||
expect(typeof info?.version).toBe('string')
|
||||
})
|
||||
|
||||
it('reports a directory and a non-regular type', async () => {
|
||||
const sub = join(dir, 'sub')
|
||||
await mkdir(sub)
|
||||
expect((await probe(sub))?.type).toBe('directory')
|
||||
})
|
||||
|
||||
it('reports a socket/special file as type "other"', async () => {
|
||||
const sockPath = join(dir, 'sock')
|
||||
const server = createServer()
|
||||
try {
|
||||
await new Promise<void>((resolve, reject) => {
|
||||
server.once('error', reject)
|
||||
server.listen(sockPath, () => { resolve() })
|
||||
})
|
||||
} catch (error: unknown) {
|
||||
// A restricted sandbox may forbid unix-domain sockets; that is an
|
||||
// environment limit, not a filesystem regression — skip rather than fail.
|
||||
const code = (error as NodeJS.ErrnoException).code
|
||||
if (code === 'EPERM' || code === 'EACCES' || code === 'ENOTSUP') return
|
||||
throw error
|
||||
}
|
||||
try {
|
||||
expect((await probe(sockPath))?.type).toBe('other')
|
||||
} finally {
|
||||
await new Promise<void>((resolve) => { server.close(() => { resolve() }) })
|
||||
}
|
||||
})
|
||||
|
||||
it('returns null when an ancestor path segment is a file (ENOTDIR), not a raw throw', async () => {
|
||||
await writeFile(join(dir, 'afile'), 'i am a file')
|
||||
expect(await probe(join(dir, 'afile', 'child.txt'))).toBeNull()
|
||||
})
|
||||
})
|
||||
|
||||
describe('readWholeText', () => {
|
||||
it('reads a small file', async () => {
|
||||
const file = join(dir, 'a.txt')
|
||||
await writeFile(file, 'one\ntwo\nthree')
|
||||
expect(await readWholeText(localTarget(file))).toBe('one\ntwo\nthree')
|
||||
})
|
||||
|
||||
it('rejects a missing file and a directory', async () => {
|
||||
await expect(readWholeText(localTarget(join(dir, 'nope')))).rejects.toMatchObject({ code: 'FS_NOT_FOUND' })
|
||||
await expect(readWholeText(localTarget(dir))).rejects.toMatchObject({ code: 'FS_NOT_REGULAR_FILE' })
|
||||
})
|
||||
|
||||
it('rejects binary and invalid UTF-8', async () => {
|
||||
await writeFile(join(dir, 'bin'), Buffer.from([0x68, 0x00, 0x69]))
|
||||
await expect(readWholeText(localTarget(join(dir, 'bin')))).rejects.toMatchObject({ code: 'FS_NOT_TEXT' })
|
||||
await writeFile(join(dir, 'bad'), Buffer.from([0x68, 0xff, 0x69]))
|
||||
await expect(readWholeText(localTarget(join(dir, 'bad')))).rejects.toMatchObject({ code: 'FS_NOT_TEXT' })
|
||||
})
|
||||
|
||||
it('honors a pre-aborted signal', async () => {
|
||||
const file = join(dir, 'a.txt')
|
||||
await writeFile(file, 'one')
|
||||
await expect(readWholeText(localTarget(file), AbortSignal.abort())).rejects.toMatchObject({ code: 'FS_ABORTED' })
|
||||
})
|
||||
|
||||
it('passes a live (non-aborted) signal through', async () => {
|
||||
const file = join(dir, 'a.txt')
|
||||
await writeFile(file, 'one\ntwo')
|
||||
expect(await readWholeText(localTarget(file), new AbortController().signal)).toBe('one\ntwo')
|
||||
})
|
||||
|
||||
it('translates a mid-read AbortError into FS_ABORTED', async () => {
|
||||
const file = join(dir, 'a.txt')
|
||||
await writeFile(file, 'one\ntwo')
|
||||
const ac = new AbortController()
|
||||
// Abort after the synchronous entry check but before readFile runs (the
|
||||
// stat await yields control back here), so readFile rejects AbortError.
|
||||
const pending = readWholeText(localTarget(file), ac.signal)
|
||||
ac.abort()
|
||||
await expect(pending).rejects.toMatchObject({ code: 'FS_ABORTED' })
|
||||
})
|
||||
})
|
||||
|
||||
describe('streamWholeText', () => {
|
||||
it('streams the whole file as decoded text', async () => {
|
||||
const file = join(dir, 'a.txt')
|
||||
await writeFile(file, 'one\ntwo\nthree')
|
||||
expect(await collect(streamWholeText(localTarget(file)))).toBe('one\ntwo\nthree')
|
||||
})
|
||||
|
||||
it('streams a large multi-chunk file correctly', async () => {
|
||||
const file = join(dir, 'big.txt')
|
||||
const content = Array.from({ length: 50 }, (_, i) => `line ${i}: ${'x'.repeat(3000)}`).join('\n')
|
||||
await writeFile(file, content)
|
||||
expect(await collect(streamWholeText(localTarget(file)))).toBe(content)
|
||||
})
|
||||
|
||||
it('rejects a missing file, directory, binary, and invalid UTF-8', async () => {
|
||||
await expect(collect(streamWholeText(localTarget(join(dir, 'nope'))))).rejects.toMatchObject({ code: 'FS_NOT_FOUND' })
|
||||
await expect(collect(streamWholeText(localTarget(dir)))).rejects.toMatchObject({ code: 'FS_NOT_REGULAR_FILE' })
|
||||
await writeFile(join(dir, 'bin'), Buffer.from([0x68, 0x00, 0x69]))
|
||||
await expect(collect(streamWholeText(localTarget(join(dir, 'bin'))))).rejects.toMatchObject({ code: 'FS_NOT_TEXT' })
|
||||
await writeFile(join(dir, 'bad'), Buffer.from([0x68, 0xff, 0x69]))
|
||||
await expect(collect(streamWholeText(localTarget(join(dir, 'bad'))))).rejects.toMatchObject({ code: 'FS_NOT_TEXT' })
|
||||
})
|
||||
|
||||
it('honors a pre-aborted signal', async () => {
|
||||
const file = join(dir, 'a.txt')
|
||||
await writeFile(file, 'one')
|
||||
await expect(collect(streamWholeText(localTarget(file), AbortSignal.abort()))).rejects.toMatchObject({ code: 'FS_ABORTED' })
|
||||
})
|
||||
|
||||
it('passes a live (non-aborted) signal through the stream', async () => {
|
||||
const file = join(dir, 'a.txt')
|
||||
await writeFile(file, 'one\ntwo')
|
||||
expect(await collect(streamWholeText(localTarget(file), new AbortController().signal))).toBe('one\ntwo')
|
||||
})
|
||||
|
||||
it('translates a mid-stream abort into FS_ABORTED', async () => {
|
||||
// A multi-chunk file so the stream yields more than once; abort after the
|
||||
// first chunk and assert the structured code, not a raw AbortError.
|
||||
const file = join(dir, 'big.txt')
|
||||
await writeFile(file, 'x'.repeat(256 * 1024))
|
||||
const ac = new AbortController()
|
||||
const run = async (): Promise<void> => {
|
||||
let seen = 0
|
||||
for await (const _chunk of streamWholeText(localTarget(file), ac.signal)) {
|
||||
seen += 1
|
||||
if (seen === 1) ac.abort()
|
||||
}
|
||||
}
|
||||
await expect(run()).rejects.toMatchObject({ code: 'FS_ABORTED' })
|
||||
})
|
||||
})
|
||||
|
||||
describe('writeFileAtomic — temp-file safety', () => {
|
||||
it('writes through a private staging dir and owner-only temp file', async () => {
|
||||
const file = join(dir, 'a.txt')
|
||||
let inspected = false
|
||||
await writeFileAtomic(file, 'hello', 0o640, undefined, {
|
||||
inspectTemp: async ({ stagingDir, tempPath }) => {
|
||||
inspected = true
|
||||
expect((await stat(stagingDir)).mode & 0o777).toBe(0o700)
|
||||
expect((await stat(tempPath)).mode & 0o777).toBe(0o600)
|
||||
},
|
||||
})
|
||||
expect(inspected).toBe(true)
|
||||
expect(await readFile(file, 'utf8')).toBe('hello')
|
||||
expect((await stat(file)).mode & 0o777).toBe(0o640)
|
||||
expect((await readdir(dir)).filter(n => n.includes('.tmp'))).toEqual([])
|
||||
})
|
||||
|
||||
it('creates new files owner-only by default', async () => {
|
||||
const file = join(dir, 'a.txt')
|
||||
await writeFileAtomic(file, 'hello', undefined, undefined)
|
||||
expect((await stat(file)).mode & 0o777).toBe(0o600)
|
||||
})
|
||||
|
||||
it('opens staging paths exclusively — a pre-existing path is never clobbered', async () => {
|
||||
const file = join(dir, 'a.txt')
|
||||
const tempDirName = '.fixed-temp.tmpdir'
|
||||
await mkdir(join(dir, tempDirName))
|
||||
await writeFile(join(dir, tempDirName, 'PRECIOUS'), 'keep')
|
||||
await expect(
|
||||
writeFileAtomic(file, 'hello', undefined, undefined, { tempDirName: () => tempDirName }),
|
||||
).rejects.toMatchObject({ code: 'EEXIST' })
|
||||
expect(await readFile(join(dir, tempDirName, 'PRECIOUS'), 'utf8')).toBe('keep')
|
||||
await expect(stat(file)).rejects.toMatchObject({ code: 'ENOENT' })
|
||||
})
|
||||
|
||||
it('creates parent directories as needed', async () => {
|
||||
const file = join(dir, 'nested', 'deep', 'a.txt')
|
||||
await writeFileAtomic(file, 'hi', undefined, undefined)
|
||||
expect(await readFile(file, 'utf8')).toBe('hi')
|
||||
})
|
||||
|
||||
it('passes a live (non-aborted) signal through the write', async () => {
|
||||
const file = join(dir, 'a.txt')
|
||||
await writeFileAtomic(file, 'hi', undefined, new AbortController().signal)
|
||||
expect(await readFile(file, 'utf8')).toBe('hi')
|
||||
})
|
||||
|
||||
it('aborts before writing when the signal is already aborted', async () => {
|
||||
const file = join(dir, 'a.txt')
|
||||
await expect(writeFileAtomic(file, 'hi', undefined, AbortSignal.abort())).rejects.toMatchObject({ code: 'FS_ABORTED' })
|
||||
await expect(stat(file)).rejects.toMatchObject({ code: 'ENOENT' })
|
||||
})
|
||||
|
||||
it('cleans up the temp file when the final rename fails', async () => {
|
||||
const sub = join(dir, 'occupied')
|
||||
await mkdir(sub)
|
||||
await expect(writeFileAtomic(sub, 'hi', undefined, undefined)).rejects.toBeInstanceOf(Error)
|
||||
expect((await readdir(dir)).filter(n => n.includes('.tmp'))).toEqual([])
|
||||
})
|
||||
})
|
||||
|
||||
describe('applyLiteralEdit', () => {
|
||||
it('replaces a unique match', () => {
|
||||
expect(applyLiteralEdit('a b c', 'b', 'X', false, 'f')).toEqual({ content: 'a X c', replacements: 1 })
|
||||
})
|
||||
|
||||
it('rejects zero matches', () => {
|
||||
expect(() => applyLiteralEdit('a b c', 'z', 'X', false, 'f')).toThrow(expect.objectContaining({ code: 'FS_EDIT_NOT_FOUND' }))
|
||||
})
|
||||
|
||||
it('rejects an empty oldString without scanning forever', () => {
|
||||
expect(() => applyLiteralEdit('a b c', '', 'X', false, 'f')).toThrow(expect.objectContaining({ code: 'FS_EDIT_NOT_FOUND' }))
|
||||
})
|
||||
|
||||
it('rejects multiple matches without replaceAll', () => {
|
||||
expect(() => applyLiteralEdit('a a a', 'a', 'X', false, 'f')).toThrow(expect.objectContaining({ code: 'FS_AMBIGUOUS_EDIT' }))
|
||||
})
|
||||
|
||||
it('replaces all matches with replaceAll', () => {
|
||||
expect(applyLiteralEdit('a a a', 'a', 'X', true, 'f')).toEqual({ content: 'X X X', replacements: 3 })
|
||||
})
|
||||
|
||||
it('matches across normalized line endings', () => {
|
||||
expect(applyLiteralEdit('one\ntwo', 'one\ntwo', 'x', false, 'f').replacements).toBe(1)
|
||||
})
|
||||
})
|
||||
|
||||
describe('readForEdit + restoreLineEndings', () => {
|
||||
it('round-trips CRLF: matches on LF, writes back CRLF', async () => {
|
||||
const file = join(dir, 'crlf.txt')
|
||||
await writeFile(file, 'one\r\ntwo\r\n')
|
||||
const original = await readForEdit(file, file)
|
||||
expect(original.lineEndings).toBe('CRLF')
|
||||
const edited = applyLiteralEdit(original.content, 'two', 'TWO', false, file)
|
||||
expect(restoreLineEndings(edited.content, original.lineEndings)).toBe('one\r\nTWO\r\n')
|
||||
})
|
||||
|
||||
it('rejects a binary file and invalid UTF-8', async () => {
|
||||
await writeFile(join(dir, 'bin'), Buffer.from([0x00, 0x01]))
|
||||
await expect(readForEdit(join(dir, 'bin'), join(dir, 'bin'))).rejects.toMatchObject({ code: 'FS_NOT_TEXT' })
|
||||
await writeFile(join(dir, 'bad'), Buffer.from([0x68, 0xff, 0x69]))
|
||||
await expect(readForEdit(join(dir, 'bad'), join(dir, 'bad'))).rejects.toMatchObject({ code: 'FS_NOT_TEXT' })
|
||||
})
|
||||
|
||||
it('passes a live (non-aborted) signal through the read', async () => {
|
||||
const file = join(dir, 'a.txt')
|
||||
await writeFile(file, 'one\ntwo')
|
||||
const original = await readForEdit(file, file, new AbortController().signal)
|
||||
expect(original.content).toBe('one\ntwo')
|
||||
})
|
||||
|
||||
it('translates a mid-read AbortError into FS_ABORTED', async () => {
|
||||
const file = join(dir, 'a.txt')
|
||||
await writeFile(file, 'one\ntwo')
|
||||
const ac = new AbortController()
|
||||
// Abort after the synchronous entry check, while readFile is pending.
|
||||
const pending = readForEdit(file, file, ac.signal)
|
||||
ac.abort()
|
||||
await expect(pending).rejects.toMatchObject({ code: 'FS_ABORTED' })
|
||||
})
|
||||
})
|
||||
@@ -0,0 +1,15 @@
|
||||
{
|
||||
"extends": "../../../tsconfig.base.json",
|
||||
"compilerOptions": {
|
||||
"rootDir": "src",
|
||||
"outDir": "lib/types"
|
||||
},
|
||||
"include": ["src"],
|
||||
"references": [
|
||||
{ "path": "../../../vendor/cosmokit" },
|
||||
{ "path": "../../../vendor/cordis" },
|
||||
{ "path": "../../../vendor/schemastery" },
|
||||
{ "path": "../../llm/llm" },
|
||||
{ "path": "../fs" }
|
||||
]
|
||||
}
|
||||
@@ -0,0 +1,48 @@
|
||||
# @deepseek-ai/dsh-fs-policy
|
||||
|
||||
The **fs-policy plugin**: it adds observed-state, read-before-edit, and version-guarded write/edit on top of the `ctx.fs` provider seam ([`@deepseek-ai/dsh-fs`](../fs)) — through the `fs/*` event gate, **NOT** through a method service. This plugin registers **no** `ctx.fsPolicy` service and has no public `read`/`write`/`edit`/`resolve` methods. It is the policy third of the filesystem stack: not a swappable seam, but the policy that does not belong on the `FileSystem` provider base class.
|
||||
|
||||
```ts
|
||||
import type { Context } from 'cordis'
|
||||
import * as FsPolicy from '@deepseek-ai/dsh-fs-policy'
|
||||
|
||||
declare const ctx: Context
|
||||
|
||||
// No service to inject — this plugin only registers the three fs/* listeners.
|
||||
// Load it alongside a ctx.fs provider (e.g. @deepseek-ai/dsh-fs-local) and the
|
||||
// @deepseek-ai/dsh-tool-fs tools; the tools dispatch the fs/* events this plugin
|
||||
// decides. Order does not matter for resolution (no inject), but the policy
|
||||
// listener should be the first decider registered for the fs/*-intent slots.
|
||||
await ctx.plugin(FsPolicy)
|
||||
```
|
||||
|
||||
## The four-layer split
|
||||
|
||||
| Layer | Package | Role |
|
||||
|---|---|---|
|
||||
| tool / executor | `@deepseek-ai/dsh-tool-fs` | model-facing schemas + read windowing + text rendering; reads/writes/edits via `ctx.fs`, dispatches the `fs/*` events |
|
||||
| policy | `@deepseek-ai/dsh-fs-policy` (this) | observed-state + read-before-edit + version-guarded write/edit, contributed through the `fs/*` event gate (no service) |
|
||||
| provider seam | `@deepseek-ai/dsh-fs` | `ctx.fs`: text IO + atomic mutation primitives (optional version guard); owns the `fs/*` event vocabulary |
|
||||
| provider | `@deepseek-ai/dsh-fs-local` | local implementation of `ctx.fs` |
|
||||
|
||||
## How the gate participates
|
||||
|
||||
Three `fs/*` events (declared by `@deepseek-ai/dsh-fs`, dispatched by `@deepseek-ai/dsh-tool-fs`):
|
||||
|
||||
| Event | This plugin's listener |
|
||||
|---|---|
|
||||
| `fs/write-intent` | No prior observation → `{ kind: 'createIfAbsent' }`; a prior observation → `{ kind: 'replaceIfVersion', version: vObserved }`. Single-slot decision; does NOT call `next()`. |
|
||||
| `fs/edit-intent` | Requires a prior observation by this owner (else throws `FS_NOT_OBSERVED`); returns `{ version: vObserved }` as the CAS basis. Single-slot decision; does NOT call `next()`. |
|
||||
| `fs/observed` | Records `{ version }` for this owner+target. Synchronous, side-effect-only `WeakMap.set`. |
|
||||
|
||||
## Observed state is the prior-observation record; freshness is provider CAS
|
||||
|
||||
Observed state is a `WeakMap<owner, Map<targetKey, FsVersion>>`. An entry exists **iff** the owner has read, written, OR edited that target (every success emits `fs/observed`), so its presence is the prior-observation record — there is no `hasRead` flag and no `full`/`partial` view. This plugin does **no** filesystem I/O: "have you observed this file?" is a `WeakMap` lookup, and "is the version you read still current?" is decided inside `ctx.fs.editText`/`writeText` in the same atomic lock that performs the mutation — this plugin only supplies `vObserved` as the basis. A windowed read of lines 100-150 records the file's version, and a later edit of line 120 is authorized as long as the file is unchanged. State is held weakly and dropped on disposal (HMR safety); persistence across sessions is deferred.
|
||||
|
||||
## Single-slot, first-wins
|
||||
|
||||
The `fs/write-intent`/`fs/edit-intent` slots hold exactly one decider — this plugin fully decides and does not call `next()`. The slot is first-wins by registration order; this plugin owning it is the default-deployment convention, not an event-enforced invariant (a decider registered before / `prepend`ed would win instead). This is not a composable authorization chain — layered permission/audit/sandbox interception belongs on `tools/execute`.
|
||||
|
||||
## No method coupling
|
||||
|
||||
Because the plugin influences the world only through events, removing it does not break `@deepseek-ai/dsh-tool-fs` at a service-injection boundary: the tool falls through to the bare `ctx.fs` provider (unconditional write/edit, no observed-state). Loading it back layers the policy on. That graceful add/remove is the whole point of the event gate over a mandatory method service.
|
||||
@@ -0,0 +1,33 @@
|
||||
{
|
||||
"name": "@deepseek-ai/dsh-fs-policy",
|
||||
"description": "File-context policy plugin for the DeepSeek Harness — observed-state, read-before-edit, and version-guarded write/edit added over the ctx.fs provider seam through the fs/* event gate (no service surface)",
|
||||
"version": "0.0.1",
|
||||
"private": true,
|
||||
"type": "module",
|
||||
"main": "lib/index.js",
|
||||
"types": "lib/types/index.d.ts",
|
||||
"exports": {
|
||||
".": {
|
||||
"types": "./lib/types/index.d.ts",
|
||||
"default": "./lib/index.js"
|
||||
},
|
||||
"./src/*": "./src/*",
|
||||
"./package.json": "./package.json"
|
||||
},
|
||||
"files": [
|
||||
"lib/index.js",
|
||||
"lib/types/**/*.d.ts",
|
||||
"lib/types/**/*.d.ts.map",
|
||||
"src"
|
||||
],
|
||||
"license": "BSD-3-Clause",
|
||||
"peerDependencies": {
|
||||
"@deepseek-ai/dsh-fs": "^0.0.1",
|
||||
"cordis": "^4.0.0-rc.6"
|
||||
},
|
||||
"devDependencies": {
|
||||
"@deepseek-ai/dsh-fs": "workspace:^",
|
||||
"@deepseek-ai/dsh-llm": "workspace:^",
|
||||
"cordis": "^4.0.0-rc.6"
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,160 @@
|
||||
/**
|
||||
* The fs-policy PLUGIN: observed-state, read-before-edit, and
|
||||
* "write/edit must be based on the version you read" — added on top of the
|
||||
* `ctx.fs` provider seam through the `fs/*` event gate, NOT through a method
|
||||
* service. This plugin registers NO `ctx.fsPolicy` service and exposes no
|
||||
* `read`/`write`/`edit`/`resolve` methods; it influences the world only by
|
||||
* deciding the `fs/write-intent`/`fs/edit-intent` waterfalls and
|
||||
* recording on `fs/observed`. That is what keeps `@deepseek-ai/dsh-tool-fs`
|
||||
* (the executor) free of any method coupling to the policy layer — removing
|
||||
* this plugin gracefully loses the policy and leaves the unconstrained bare
|
||||
* provider, rather than breaking the tool at a service-injection boundary.
|
||||
*
|
||||
* ## Observed state IS the prior-observation record
|
||||
*
|
||||
* State lives here as `WeakMap<owner, Map<targetKey, { version }>>`. An entry
|
||||
* exists iff the owner has read, written, OR edited that target (every success
|
||||
* emits `fs/observed`), so its presence means "this owner has observed this
|
||||
* target at this version". This is what lets a create-then-edit or
|
||||
* edit-then-edit sequence work without an intervening re-read: the mutation
|
||||
* refreshes the recorded version to its own result. The owner is derived
|
||||
* structurally from `{ agent?: { session? } }` and held weakly, so a collected
|
||||
* session frees its state; disposal drops everything (HMR safety).
|
||||
*
|
||||
* ## Freshness via provider CAS, not stat
|
||||
*
|
||||
* This plugin does NO filesystem I/O. "Have you observed this file?" is a
|
||||
* `WeakMap` lookup (no record ⇒ `FS_NOT_OBSERVED`). "Is the version you read
|
||||
* still current?" is decided INSIDE `ctx.fs.editText`/`writeText`, in the same
|
||||
* atomic lock that performs the mutation — this plugin only supplies the
|
||||
* observed version as the CAS basis. Stat-ing and comparing here would open a
|
||||
* TOCTOU gap the provider lock has to back up anyway, so it is deliberately
|
||||
* avoided.
|
||||
*
|
||||
* ## Single-slot, first-wins
|
||||
*
|
||||
* The `fs/write-intent`/`fs/edit-intent` listeners do NOT call
|
||||
* `next()`: each fully decides its single slot. The slot is first-wins by
|
||||
* registration order — this plugin owning it is the default-deployment
|
||||
* convention, not an event-enforced invariant (a decider registered before /
|
||||
* `prepend`ed would win instead). This is not a composable authorization chain;
|
||||
* layered permission/audit/sandbox interception belongs on `tools/execute`.
|
||||
*
|
||||
* @module @deepseek-ai/dsh-fs-policy
|
||||
*/
|
||||
|
||||
import type { Context } from 'cordis'
|
||||
import { FsError } from '@deepseek-ai/dsh-fs'
|
||||
import type { FsTarget, FsVersion, FsWriteIntent } from '@deepseek-ai/dsh-fs'
|
||||
import type { FsPolicyExec } from './types.ts'
|
||||
|
||||
export type { FsPolicyExec } from './types.ts'
|
||||
|
||||
/**
|
||||
* Per-context observed-file state and the three `fs/*` decisions over it. One
|
||||
* instance is created per `apply()` so disposal can drop all state for HMR.
|
||||
*/
|
||||
class ObservedStateGate {
|
||||
/**
|
||||
* Observed-file state, keyed first by the owner object (weakly held, so a
|
||||
* collected session frees its state), then by {@link FsTarget.targetKey}. An
|
||||
* entry's PRESENCE is the prior-observation record.
|
||||
*/
|
||||
private observed = new WeakMap<object, Map<string, FsVersion>>()
|
||||
|
||||
/**
|
||||
* Derive the observed-state owner from the opaque event actor — normally the
|
||||
* active agent session. `undefined` when no owner can be derived (e.g. a
|
||||
* direct tool call with no agent); such calls read freely but cannot satisfy
|
||||
* the write/edit prior-observation policy.
|
||||
*/
|
||||
private owner(actor: object | undefined): object | undefined {
|
||||
return (actor as FsPolicyExec | undefined)?.agent?.session
|
||||
}
|
||||
|
||||
private get(owner: object, targetKey: string): FsVersion | undefined {
|
||||
return this.observed.get(owner)?.get(targetKey)
|
||||
}
|
||||
|
||||
private set(owner: object, targetKey: string, version: FsVersion): void {
|
||||
let byTarget = this.observed.get(owner)
|
||||
if (!byTarget) {
|
||||
byTarget = new Map()
|
||||
this.observed.set(owner, byTarget)
|
||||
}
|
||||
byTarget.set(targetKey, version)
|
||||
}
|
||||
|
||||
/** Drop all recorded state (HMR safety / disposal). */
|
||||
clear(): void {
|
||||
this.observed = new WeakMap()
|
||||
}
|
||||
|
||||
/**
|
||||
* Decide the write intent: no prior observation ⇒ `createIfAbsent` (only
|
||||
* new files can be created blindly); a prior observation ⇒ `replaceIfVersion`
|
||||
* at the observed version (existing files replaced only if unchanged).
|
||||
*/
|
||||
writeIntent(target: FsTarget, actor: object | undefined): FsWriteIntent {
|
||||
const owner = this.owner(actor)
|
||||
const prior = owner ? this.get(owner, target.targetKey) : undefined
|
||||
return prior ? { kind: 'replaceIfVersion', version: prior } : { kind: 'createIfAbsent' }
|
||||
}
|
||||
|
||||
/**
|
||||
* Decide the edit version guard: requires a prior observation by this owner
|
||||
* (else `FS_NOT_OBSERVED`); returns the observed version as the CAS basis.
|
||||
*/
|
||||
editIntent(target: FsTarget, actor: object | undefined): { version: FsVersion } {
|
||||
const owner = this.owner(actor)
|
||||
const prior = owner ? this.get(owner, target.targetKey) : undefined
|
||||
if (!owner || !prior) {
|
||||
throw new FsError(`edit requires reading "${target.displayPath}" first`, 'FS_NOT_OBSERVED')
|
||||
}
|
||||
return { version: prior }
|
||||
}
|
||||
|
||||
/** Record a successful read/write/edit: this owner observed this target at this version. */
|
||||
observe(target: FsTarget, version: FsVersion, actor: object | undefined): void {
|
||||
const owner = this.owner(actor)
|
||||
if (owner) this.set(owner, target.targetKey, version)
|
||||
}
|
||||
}
|
||||
|
||||
/** Cordis plugin name used by loader diagnostics. */
|
||||
export const name = 'fs-policy'
|
||||
|
||||
/**
|
||||
* Register the three `fs/*` listeners. No `inject` — this plugin reads no
|
||||
* services; it operates only on its own `WeakMap`. The waterfalls are unbound
|
||||
* (the tool dispatches them with no `this`), so the listeners take the raw
|
||||
* `(target, actor, next)` arguments.
|
||||
*/
|
||||
export function apply(ctx: Context): void {
|
||||
const gate = new ObservedStateGate()
|
||||
|
||||
ctx.effect(() => () => {
|
||||
// Drop all recorded state on disposal so a reloaded plugin starts clean
|
||||
// (HMR safety). The WeakMap itself would be GC'd, but replacing it makes the
|
||||
// release observable and immediate for tests.
|
||||
gate.clear()
|
||||
}, 'fs-policy observed-state teardown')
|
||||
|
||||
// fs/write-intent: occupy the single decision slot — do NOT call next().
|
||||
// Deferred through Promise.resolve().then so the declared Promise return type
|
||||
// holds (a throw rejects, never escapes synchronously through the waterfall).
|
||||
ctx.on('fs/write-intent', (target, actor) => Promise.resolve().then(() => gate.writeIntent(target, actor)))
|
||||
|
||||
// fs/edit-intent: occupy the single decision slot — do NOT call next().
|
||||
// Deferred the same way so an FS_NOT_OBSERVED throw becomes a rejected promise
|
||||
// the edit tool's `await ctx.waterfall(...)` surfaces as its isError result.
|
||||
ctx.on('fs/edit-intent', (target, actor) => Promise.resolve().then(() => gate.editIntent(target, actor)))
|
||||
|
||||
// fs/observed: synchronous, side-effect-only WeakMap write. The tool emits
|
||||
// this with a plain (unguarded) ctx.emit, so this listener MUST NOT throw —
|
||||
// a throw would surface as the tool's isError result for a mutation that
|
||||
// already succeeded. A WeakMap.set honors that contract.
|
||||
ctx.on('fs/observed', (target, version, actor) => {
|
||||
gate.observe(target, version, actor)
|
||||
})
|
||||
}
|
||||
Some files were not shown because too many files have changed in this diff Show More
Reference in New Issue
Block a user