Merge pull request #86 from deepseek-ai/worktree-simplify-trace-events

simplify(session): fold trace-only usage/error events into load-bearing events
This commit is contained in:
Tianyi Cui
2026-06-21 20:34:41 +08:00
committed by GitHub
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@@ -6,7 +6,7 @@ This is the monorepo for the DeepSeek Harness group. It currently hosts the code
**This applies only while the harness is unreleased — remove this section at the first tagged/published release.** There are no external consumers yet, so optimize for the *correct foundation*, not for a small diff. When the right structure means moving a file across package boundaries, renaming a public symbol, or repackaging a plugin, do it — and update every reference in the same change. Do **not** add backward-compat shims, deprecation aliases, re-export stubs, or "keep it where it is to avoid churn" hedges; those are debts you take on to protect callers you do not have. Churn now is cheap; a wrong foundation set in stone is not. (Once released, this inverts — backward compatibility becomes a real constraint and this section comes out.)
This extends to **on-disk formats, schemas, and stored data**: while unreleased there is no persisted user data to preserve, so a format/schema/contract change needs **no migration path**. Bump the version and reject (don't migrate) anything not at the current version — e.g. the SQLite backend's `SCHEMA_VERSION` bump that drops columns simply rejects any non-current `user_version` on open, with no v1→v2 migration. A migration written now is a shim for data that does not exist.
This extends to **on-disk formats, schemas, and stored data**: while unreleased there is no persisted user data to preserve, so a format/schema/contract change needs **no migration path** — a backend REJECTS anything not at the current version rather than upgrading it. How the *version number itself* behaves pre-release is a per-format choice between two equally-valid stances, and the repo uses both deliberately. **Monotonic bump-and-reject**: each breaking change increments the version — e.g. the SQLite backend's `SCHEMA_VERSION` bump that drops columns rejects any non-current `user_version` on open, with no migration; use it when a stored artifact has a small enumerable set of revisions worth telling apart. **A pinned `0` "unstable / pre-release" version**: the format stays at `0` and absorbs ALL pre-release shape churn without bumping, while a backend still rejects any non-`0` log — the session event log uses this (`SESSION_FORMAT_VERSION = 0` in `dsh-session`), because its shape changes often while unreleased and bumping on every tweak would dress up an unstable format as a sequence of stable boundaries that mean nothing yet; pinning `0` and documenting it "no compatibility implied" makes the instability *explicit* instead of pretending each revision is a real version. Either way there is no migration code, and either way a real monotonic policy begins at the first tagged release. A migration written now is a shim for data that does not exist.
## Tests document behavior, not golden truth
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@@ -83,7 +83,7 @@ Streaming is a raw chunk protocol (`block-start`, `text-delta`, `reasoning-delta
A `Session` is an append-only log of typed `SessionEvent`s — the single source of truth. The LLM message history is *derived* from the log (`deriveMessages()`):
- `user/message` → user message
- `assistant/message` → assistant message (raw `assistant/chunk` events are replay/UI data and are skipped in derivation)
- `assistant/message` → assistant message (raw `assistant/chunk` events are replay/UI data and are skipped in derivation; an empty-content `assistant/message`, which exists only to host a max-tokens step's `usage`, is skipped too)
- `tool/result` → user message carrying a `tool-result` block
- `context/message`, `steering/message` → user-role messages wrapped in a tagged envelope (`<context source="…">…</context>`) at their chronological position — the "system-reminder" pattern; models distinguish them from real user prompts by the envelope. **TODO(review)**: the real adapters now exist (the original precondition); the envelope still wants a deliberate review against live model behavior (`TODO(review)` in dsh-session).
@@ -142,7 +142,7 @@ forever:
step error (turn ends error/aborted,
not a normal completed message)
msg = waterfall agent/step-result ⟵ runs BEFORE the log append, so the
session('assistant/message', 'usage') log records what tool dispatch uses
session('assistant/message' {content, usage?}) log records what tool dispatch uses
each tool-call (sequential, abort-checked between calls):
session('tool/call'); ctx.tools.execute() ⟵ waterfall tools/execute
session('tool/result')
@@ -158,11 +158,11 @@ forever:
emit agent/status(idle) unless more queued
```
Error containment: a throwing `agent/turn-continuation` listener or a broken step ends the **turn** with an `error` event (appended INSIDE the turn, before `turn/end`) — never the driver loop. An adapter that ends its stream with a `finish {kind:'error'}` or `{kind:'aborted'}` chunk (the in-band error path, for adapters that can't throw mid-stream) is likewise translated into a step error, so the turn ends `error`/`aborted` instead of logging a normal `completed` assistant message. A `cancel()` is honored mid-stream **and** between tool calls; disposal mid-turn ends the turn with reason `disposed` and emits `agent/status('disposed')`.
Error containment: a throwing `agent/turn-continuation` listener or a broken step ends the **turn** with `turn/end { reason: { kind: 'error', step, message, code? } }` — the failure's step number rides on the durable turn reason (there is no separate session `error` event); live diagnostics fire via `agent/error`. Never the driver loop. An adapter that ends its stream with a `finish {kind:'error'}` or `{kind:'aborted'}` chunk (the in-band error path, for adapters that can't throw mid-stream) is likewise translated into a step error, so the turn ends `error`/`aborted` instead of logging a normal `completed` assistant message. A `cancel()` is honored mid-stream **and** between tool calls; disposal mid-turn ends the turn with reason `disposed` and emits `agent/status('disposed')`.
Turn-end reasons: a turn ends with one `TurnEndReason``completed`, `aborted`, `error`, `disposed`, or `max-tokens`. `max-tokens` mirrors the model-call `FinishReason` of the same name (DeepSeek's `length`): a step that hit the output-token ceiling makes the turn end `max-tokens` rather than `completed`, by the rule *any `max-tokens` step in the turn surfaces as `max-tokens`* (a continuation plugin may run further steps after one, but the cut-short fact wins; the `disposed`/`aborted`/`error` outcomes still take precedence). This lets a consumer distinguish a clean stop from a truncated one (the ACP bridge maps it to the `max_tokens` stop reason). `TurnEndReason` is merge-extensible; `refusal` and `max_turn_requests` are the next variants to add when an adapter/loop first emits them.
A failure that happens once the turn is already closed has no in-turn position for a session `error` event (appending one after `turn/end` would put it past the persistence commit boundary, where it is dropped as a crash tail — [the turn-enclosure invariant](rfc/implemented/architecture/2026-06-15-turn-enclosure-invariant.md)). So a rejecting `session/flush` (the post-`turn/end` durability checkpoint) and a throwing `agent/turn-end` listener are reported via `agent/error` + the logger only, NOT as a session event; the turn stays balanced and the persistence backend keeps its buffered events for the next flush.
A failure that happens once the turn is already closed has no in-turn position for a turn-end error reason (the turn already ended). So a rejecting `session/flush` (the post-`turn/end` durability checkpoint) and a throwing `agent/turn-end` listener are reported via `agent/error` + the logger only, NOT as a session event; the turn stays balanced and the persistence backend keeps its buffered events for the next flush.
**Turn-enclosure invariant**: every session event lives inside a turn (between a `turn/start` and its `turn/end`). The loop appends queued `user/message` events *after* `turn/start`, and an idle `agent.inject()` wraps its `context/message` in a one-shot `injection` turn. This makes the turn the single durability/replay boundary: a persistence backend can treat anything after the last `turn/end` as an interrupted-crash tail without risking the loss of legitimately-recorded between-turn context. The `dsh-invariants` plugin enforces it in dev (a message event outside an open turn throws). See [the turn-enclosure invariant](rfc/implemented/architecture/2026-06-15-turn-enclosure-invariant.md).
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@@ -390,7 +390,7 @@ get(id: SessionId): Session | undefined
list(): Session[]
```
Source: [`packages/core/session/src/index.ts:222`](../../packages/core/session/src/index.ts)
Source: [`packages/core/session/src/index.ts:229`](../../packages/core/session/src/index.ts)
### `ctx.systemPrompt` — `SystemPrompt`
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@@ -189,7 +189,7 @@ type SessionEvent<T extends SessionEventType = SessionEventType> = {
}[T]
```
The thirteen event variants (`turn/start`, `turn/end`, `step/start`, `step/end`, `user/message`, `context/message`, `assistant/chunk`, `assistant/message`, `tool/call`, `tool/result`, `steering/message`, `usage`, `error`), the `deriveMessages()` projection rules, the `TurnTrigger`/`TurnEndReason` reasons, and the turn-enclosure invariant are on **[session.md](session.md)**. How the log is made durable — the `SessionPersistence` seam, JSONL/SQLite backends, the `session/flush` checkpoint, crash recovery, and `SessionHeader` — is on **[persistence.md](persistence.md)**.
The eleven event variants (`turn/start`, `turn/end`, `step/start`, `step/end`, `user/message`, `context/message`, `assistant/chunk`, `assistant/message`, `tool/call`, `tool/result`, `steering/message`), the `deriveMessages()` projection rules, the `TurnTrigger`/`TurnEndReason` reasons, and the turn-enclosure invariant are on **[session.md](session.md)**. How the log is made durable — the `SessionPersistence` seam, JSONL/SQLite backends, the `session/flush` checkpoint, crash recovery, and `SessionHeader` — is on **[persistence.md](persistence.md)**.
## The agent handle
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@@ -20,7 +20,11 @@ Source: [`packages/core/session/src/types.ts`](../../packages/core/session/src/t
```ts type-equiv
interface SessionHeader {
/** On-disk format version; a persistence backend rejects unknown versions. */
/**
* On-disk format version, stamped from {@link SESSION_FORMAT_VERSION} when the
* session is created. A persistence backend rejects any other version on load
* (no migration — see the constant).
*/
version: number
/** The session's id (mirrors the {@link Session}'s id). */
id: SessionId
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@@ -24,14 +24,17 @@ interface SessionEventMap {
'context/message': { content: ContentBlock[]; source: MessageSource }
/** Raw stream chunk — token-level replay fidelity. */
'assistant/chunk': { turn: number; step: number; chunk: StreamChunk }
/** Assembled assistant message for one step (derived history uses this). */
'assistant/message': { turn: number; step: number; content: ContentBlock[] }
/**
* Assembled assistant message for one step (derived history uses this).
* Carries the step's `usage` when the adapter reported token accounting, so
* the model output and its accounting travel together (there is no separate
* usage record). `usage` is absent when the adapter reported none.
*/
'assistant/message': { turn: number; step: number; content: ContentBlock[]; usage?: TokenUsage }
'tool/call': { turn: number; step: number; callId: CallId; name: string; arguments: string }
'tool/result': { turn: number; step: number; callId: CallId; content: ContentBlock[]; isError: boolean; error?: { name: string; code: string } }
/** Steering content injected between steps of a running turn. */
'steering/message': { turn: number; content: ContentBlock[]; source: MessageSource }
'usage': { turn: number; step: number; usage: TokenUsage }
'error': { turn: number; step: number; message: string; code?: string }
}
```
@@ -59,11 +62,11 @@ type SessionEvent<T extends SessionEventType = SessionEventType> = {
`Session.deriveMessages()` projects the event log into the `Message[]` the model sees. The projection rules:
- `user/message` → a user message.
- `assistant/message` → an assistant message. Raw `assistant/chunk` events are replay/UI data and are **skipped** in derivation (the assembled message is authoritative).
- `assistant/message` → an assistant message. Raw `assistant/chunk` events are replay/UI data and are **skipped** in derivation (the assembled message is authoritative). An **empty-content** `assistant/message` is also skipped — a max-tokens step cut off with no content still records an `assistant/message` to host its `usage`, but a content-less assistant turn must not enter the provider transcript.
- `tool/result` → a user message carrying a `tool-result` block.
- `context/message`, `steering/message` → user-role messages wrapped in a tagged envelope (`<context source="…">…</context>`) at their chronological position — the "system-reminder" pattern; the model distinguishes them from real prompts by the envelope.
Everything else (`turn/*`, `step/*`, `usage`, `error`) is structural/telemetry and does not project into a message.
Everything else (`turn/*`, `step/*`) is structural and does not project into a message. Token usage is observed on `assistant/message.usage` (the step that produced it); an operational error's step number is on `turn/end.reason` for `kind: 'error'`.
## What started a turn: `TurnTriggerMap`
@@ -89,7 +92,13 @@ interface TurnTriggerMap {
interface TurnEndReasonMap {
completed: { kind: 'completed' }
aborted: { kind: 'aborted'; reason?: string }
error: { kind: 'error'; message: string; code?: string }
/**
* The turn failed: a step threw or the model reported a failure. `step` is the
* step number the failure occurred on (the operational error's location — the
* single durable record of an in-turn failure; live diagnostics also fire via
* `agent/error`). `code` is the error's code when one was attached.
*/
error: { kind: 'error'; step: number; message: string; code?: string }
disposed: { kind: 'disposed' }
'max-tokens': { kind: 'max-tokens' }
/**
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@@ -51,7 +51,6 @@ Do NOT write one for a mechanical or local choice (a variable name, a one-file r
|---|---|
| [Unify the agent id and the session id](proposed/simplification/2026-06-20-unify-agent-and-session-id.md) | 2026-06-20 |
| [Stop mirroring durable boundaries as agent events](proposed/simplification/2026-06-20-remove-agent-boundary-mirror-events.md) | 2026-06-20 |
| [Fold trace-only session facts into load-bearing events](proposed/simplification/2026-06-20-collapse-trace-only-session-events.md) | 2026-06-20 |
### Architecture
@@ -95,6 +94,7 @@ Do NOT write one for a mechanical or local choice (a variable name, a one-file r
| [Drop the unconsumed `llm/adapter-change` event](implemented/simplification/2026-06-20-drop-unconsumed-llm-adapter-change-event.md) | 2026-06-20 |
| [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 |
### Architecture
@@ -27,7 +27,7 @@ Key choices recorded here because they are durable, contested, and surprising:
- **Metadata is out-of-log.** Format version, cwd, and lineage are storage concerns, not replayable conversation state, so they live in a `SessionHeader` owned by `dsh-session` and attached to a `Session` via a new readonly `session.header` — never in `SessionEventMap`, never reaching `deriveMessages()`. The alternative (a merge-extensible `session/meta` event as log line 0) was rejected: an in-log event would ride along with a seeded/forked session for free, but metadata is not replayable state, so the explicit out-of-log header seam is the cleaner cost. (The header was originally split into an immutable `SessionHeader` plus a mutable `SessionSummary` whose union was `SessionMeta`; the mutable summary was later removed as dead state — see [Drop the mutable session summary](../simplification/2026-06-19-drop-mutable-session-summary.md).)
- **Resume is an async factory, not a change to synchronous create.** `ctx.agents.resume({ resumeSessionId })` awaits `ctx.sessionPersistence.load`, recreates the live session with the loaded events (so `lastTurnNumber`/`deriveMessages` continue), and starts a fresh agent on the resumed id (NOT `${agentId}-session`). The agent-loop does NOT hard-inject `sessionPersistence` (that would pend non-persistent demos forever); `resume` rejects with a clear error when it is absent.
Format versioning: the header carries a `version`; `load` rejects an unknown version (no v1 migration). Stated honestly: append-only + flush is robust to partial trailing writes (tolerated on load) but not to fsync-less power loss mid-line; a DB/WAL backend is the stronger option later.
Format versioning: the header carries a `version`; `load` rejects any non-current version (no migration — the pre-release session format is pinned at `SESSION_FORMAT_VERSION = 0` and absorbs shape churn, per the AGENTS.md pre-release stance). Stated honestly: append-only + flush is robust to partial trailing writes (tolerated on load) but not to fsync-less power loss mid-line; a DB/WAL backend is the stronger option later.
## Consequences
@@ -1,6 +1,6 @@
# RFC: Fold trace-only session facts into load-bearing events
Status: proposed
Status: implemented (proposed and accepted 2026-06-20)
## Problem
@@ -26,8 +26,18 @@ If analytics become real, add a projection helper or a dedicated telemetry store
- The loop records durable failures through `turn/end { kind: 'error', step, message, code? }` or an equivalent no-information-loss shape and reports live diagnostics through `agent/error`.
- ACP snapshots and persistence tests stop asserting trace-only lines.
- Documentation explains exactly where token usage and operational errors are observed.
- The session format version and recorded fixtures are refreshed; non-current stored logs are rejected per the pre-release format policy.
- Recorded fixtures are refreshed for the new event shape; the session format version stays pinned at `0` (unstable/pre-release) and backends reject any non-`0` stored log per the pre-release format policy.
## What we give up
A consumer can no longer filter the canonical log for standalone `usage` or step-level `error` rows. It must read those facts from the assistant/failure events that carry them. That is a reasonable simplification only if the implementing PR proves the same facts remain present; otherwise the standalone events should stay.
## Implementation note
Shipped as proposed, with one scope refinement (per AGENTS.md "RFCs are proposals, not golden truth"):
- **Empty-content `assistant/message` hosts usage with no data loss.** The proof the proposal demanded (no persisted usage chunk becomes unrepresented) lands on the max-tokens path: a step cut off with usage but empty content (e.g. only a dropped tool call) previously emitted a standalone `usage`. It now records an empty-content `assistant/message { content: [], usage }`. To keep that from injecting a spurious content-less assistant turn into the provider transcript, `deriveMessages()` skips empty-content `assistant/message` events. A regression test asserts usage stays represented AND derived history is uncorrupted.
**Format version.** The persisted `SessionEventMap` shape changed (usage folded onto `assistant/message`, standalone `usage`/`error` removed, `step` on `turn/end.reason.error`). The session log uses the **pinned-`0` "unstable / pre-release"** format stance (one of the two stances AGENTS.md § pre-release sanctions): `SESSION_FORMAT_VERSION` stays `0` and absorbs this and every other pre-release shape change without a monotonic bump — bumping on each tweak would dress up an unstable format as a sequence of stable boundaries that mean nothing yet. The constant is centralized in `dsh-session` and read by both write sites and the coordinator's load-time check, which rejects any non-`0` log (no migration — there is no persisted user data to preserve; a real monotonic policy begins at the first tagged release). `turn/end.reason.error.step` is required for newly-written logs.
Usage is now observed on `assistant/message.usage`; an operational error's step on `turn/end.reason` for `kind: 'error'`. `agent/error` + logging are unchanged for live diagnostics.
@@ -18,7 +18,7 @@ A snapshot test boots the **real** `examples/acp-agent` subprocess, drives it ov
### The fixture is the persisted session JSONL
The per-scenario fixture is `<scenario>/session.jsonl`: the exact log produced by running the scenario once against the real API (the snapshot harness harvests the file the JSONL persistence backend writes). This log already contains everything needed to reproduce the run deterministically: its `assistant/chunk` events carry every parsed `StreamChunk` (the LLM's behavior), and its `tool/call`/`tool/result`/`turn/*`/`assistant/message`/`usage` events carry the harness's behavior. One artifact captures both, and it is the format the codebase already treats as the authoritative replay record ([packages/core/session/src/types.ts](../../../../packages/core/session/src/types.ts): "raw chunks are the replay record").
The per-scenario fixture is `<scenario>/session.jsonl`: the exact log produced by running the scenario once against the real API (the snapshot harness harvests the file the JSONL persistence backend writes). This log already contains everything needed to reproduce the run deterministically: its `assistant/chunk` events carry every parsed `StreamChunk` (the LLM's behavior), and its `tool/call`/`tool/result`/`turn/*`/`assistant/message` events carry the harness's behavior (token usage rides on `assistant/message.usage`). One artifact captures both, and it is the format the codebase already treats as the authoritative replay record ([packages/core/session/src/types.ts](../../../../packages/core/session/src/types.ts): "raw chunks are the replay record").
An earlier draft used a hand-authored `llm.json` of model chunks; reusing the real session log instead means the fixture is a genuine product of the system (not a hand-built mock), and it doubles as a behavioral golden (see below). A byte-level HTTP-record library (Polly/nock/MSW) was rejected: adapter-specific, awkward with streaming SSE, and lower-level than the thing under test.
@@ -55,7 +55,7 @@ A snapshot run asserts **two** normalized goldens, because the harness's externa
1. The **stdout transcript** — the framed `session/update` JSON-RPC the editor sees. Catches regressions in the ACP bridge's event→update translation (`streamSessionEventUpdate`).
2. The **re-derived session JSONL** — the log the replay run itself persists, compared against the recorded fixture. Catches regressions in the loop, tool dispatch, and turn/step structure that never surface on stdout.
The two are genuinely additive: stdout is the bridge's *lossy projection* of the log (it drops `usage`, `step/*`, exact `seq`/`time`, and renders tool I/O differently), so a loop/tool/turn-structure regression can change the JSONL while leaving the stdout projection identical, and a bridge-translation regression can change stdout while the JSONL is untouched. Asserting the JSONL equality also echoes the proposed [universal replay fixture](../../proposed/testing/2026-06-11-deterministic-and-stress-testing.md) idea.
The two are genuinely additive: stdout is the bridge's *lossy projection* of the log (it drops `assistant/message.usage`, `step/*`, exact `seq`/`time`, and renders tool I/O differently), so a loop/tool/turn-structure regression can change the JSONL while leaving the stdout projection identical, and a bridge-translation regression can change stdout while the JSONL is untouched. Asserting the JSONL equality also echoes the proposed [universal replay fixture](../../proposed/testing/2026-06-11-deterministic-and-stress-testing.md) idea.
Both surfaces contain non-deterministic values that a pure normalization function scrubs **before** the snapshot: `randomUUID()` session ids → `{{sessionId}}`, the temp `mkdtemp` cwd → `{{cwd}}` (it appears in terminal-card `_meta` and the log header), JSON-RPC ids → a stable sequence, and the log's per-event `time` (epoch ms) + header `createdAt` dropped or zeroed (the log's `seq` is left intact — it is deterministic by contract, `seq = log.length`). Real bash runs during replay, so the JSONL normalizer additionally stabilizes tool-output volatility (any embedded paths/pids/timestamps) — scenarios keep bash commands tightly constrained (`echo`, file writes; no `date`/`env`/background/large-output) so this surface is small. The goldens are themselves **JSONL** — one compact, normalized record per line, in the same shape as the surfaces they mirror (NDJSON on the wire, JSONL on disk: `stdout.golden.jsonl`, `session.golden.jsonl`), so they stay `grep`/`jq`-able and faithful to what the agent actually emits. A separate raw-purity assertion keeps the guarantee that every stdout line parses as JSON (no logger leak onto the protocol channel). Vitest's `toMatchFileSnapshot` provides the golden store and the `-u`/`--update` "accept the diff" workflow.
@@ -60,7 +60,7 @@ describe('normalizeStdout', () => {
})
describe('normalizeSessionLog', () => {
const header = (over: object) => JSON.stringify({ type: 'session', version: 1, id: 's', createdAt: 123, ...over })
const header = (over: object) => JSON.stringify({ type: 'session', version: 0, id: 's', createdAt: 123, ...over })
const event = (over: object) => JSON.stringify({ type: 'turn/start', seq: 1, time: 999, data: { turn: 1 }, ...over })
it('zeroes the header createdAt', () => {
@@ -1,4 +1,4 @@
{"type":"session","version":1,"id":"{{sessionId}}","createdAt":0,"cwd":"{{cwd}}"}
{"type":"session","version":0,"id":"{{sessionId}}","createdAt":0,"cwd":"{{cwd}}"}
{"type":"turn/start","seq":0,"time":0,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
{"type":"user/message","seq":1,"time":0,"data":{"content":[{"type":"text","text":"Start a long task; this turn will be cancelled mid-stream."}],"source":{"kind":"user"}}}
{"type":"step/start","seq":2,"time":0,"data":{"turn":1,"step":1}}
@@ -1 +1 @@
{"type":"session","version":1,"id":"00000000-0000-0000-0000-000000000000","createdAt":0}
{"type":"session","version":0,"id":"00000000-0000-0000-0000-000000000000","createdAt":0}
@@ -1,7 +1,6 @@
{"type":"session","version":1,"id":"{{sessionId}}","createdAt":0,"cwd":"{{cwd}}"}
{"type":"session","version":0,"id":"{{sessionId}}","createdAt":0,"cwd":"{{cwd}}"}
{"type":"turn/start","seq":0,"time":0,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
{"type":"user/message","seq":1,"time":0,"data":{"content":[{"type":"text","text":"This prompt triggers a recorded provider error."}],"source":{"kind":"user"}}}
{"type":"step/start","seq":2,"time":0,"data":{"turn":1,"step":1}}
{"type":"step/end","seq":3,"time":0,"data":{"turn":1,"step":1}}
{"type":"error","seq":4,"time":0,"data":{"turn":1,"step":1,"message":"simulated provider error (HTTP 401)","code":"AUTH"}}
{"type":"turn/end","seq":5,"time":0,"data":{"turn":1,"reason":{"kind":"error","message":"simulated provider error (HTTP 401)","code":"AUTH"}}}
{"type":"turn/end","seq":4,"time":0,"data":{"turn":1,"reason":{"kind":"error","step":1,"message":"simulated provider error (HTTP 401)","code":"AUTH"}}}
@@ -1 +1 @@
{"type":"session","version":1,"id":"00000000-0000-0000-0000-000000000000","createdAt":0}
{"type":"session","version":0,"id":"00000000-0000-0000-0000-000000000000","createdAt":0}
@@ -1 +1 @@
{"type":"session","version":1,"id":"00000000-0000-0000-0000-000000000000","createdAt":0}
{"type":"session","version":0,"id":"00000000-0000-0000-0000-000000000000","createdAt":0}
@@ -1,4 +1,4 @@
{"type":"session","version":1,"id":"{{sessionId}}","createdAt":0,"cwd":"{{cwd}}"}
{"type":"session","version":0,"id":"{{sessionId}}","createdAt":0,"cwd":"{{cwd}}"}
{"type":"turn/start","seq":0,"time":0,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
{"type":"user/message","seq":1,"time":0,"data":{"content":[{"type":"text","text":"Reply with exactly the word: ONE. No tools."}],"source":{"kind":"user"}}}
{"type":"step/start","seq":2,"time":0,"data":{"turn":1,"step":1}}
@@ -27,40 +27,38 @@
{"type":"assistant/chunk","seq":25,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":1,"block":{"type":"text","text":"ONE"}}}}
{"type":"assistant/chunk","seq":26,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":106,"outputTokens":20,"cacheReadTokens":768,"reasoningTokens":18}}}}
{"type":"assistant/chunk","seq":27,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
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+3 -3
View File
@@ -43,7 +43,7 @@ function registerFakeAgent(ctx: Context, sessionId: string, inject: (...args: un
// `session.header.id`, NOT the registry key. Using distinct values here makes
// the test fail if a regression matched on the wrong field (a same-value fake
// would pass either way — the "hits the line but not the scenario" trap).
const agent = { id: `agent-${sessionId}`, inject, session: { header: { version: 1, id: sessionId, createdAt: 0 } } } as unknown as Agent
const agent = { id: `agent-${sessionId}`, inject, session: { header: { version: 0, id: sessionId, createdAt: 0 } } } as unknown as Agent
const dispose = ctx.agents.register(agent)
const list = fakeAgentDisposers.get(ctx) ?? []
list.push(dispose)
@@ -466,7 +466,7 @@ describe('background task ownership (cross-session isolation)', () => {
// the same token). The impl reads `session.header.id`, so the fakes MUST carry
// it.
const fakeAgent = (sessionId: string) =>
({ inject: () => undefined, session: { header: { version: 1, id: sessionId, createdAt: 0 } } }) as unknown as import('@deepseek-ai/dsh-agent').Agent
({ inject: () => undefined, session: { header: { version: 0, id: sessionId, createdAt: 0 } } }) as unknown as import('@deepseek-ai/dsh-agent').Agent
it('rejects bash_output/bash_kill for a task owned by a DIFFERENT session token', async () => {
const ctx = await setup()
@@ -582,7 +582,7 @@ describe('session-cwd routing (per-session workdir)', () => {
}
// An agent whose session header carries a cwd (what session/new records).
const agentInCwd = (cwd: string) =>
({ inject: () => undefined, session: { header: { version: 1, id: 'c', createdAt: 0, cwd } } }) as unknown as import('@deepseek-ai/dsh-agent').Agent
({ inject: () => undefined, session: { header: { version: 0, id: 'c', createdAt: 0, cwd } } }) as unknown as import('@deepseek-ai/dsh-agent').Agent
it('defaults bash to the agent\'s session cwd (not the server launch dir)', async () => {
const ctx = await setup()
+33 -36
View File
@@ -38,8 +38,8 @@ function toError(error: unknown): CodedError {
* caller's try/catch), OR end the stream with a finish-error/aborted chunk
* (the only option for adapters that can't throw mid-stream, e.g.
* library-backed ones). This translates the latter into a thrown step error
* so the turn ends error/aborted with a logged `error` event, never as a
* normal `completed` assistant message.
* so the turn ends error/aborted (the failure recorded on `turn/end.reason`),
* never as a normal `completed` assistant message.
*
* `FinishReason` is merge-extensible (plugins/adapters can add `kind`s), so
* the switch handles the known terminal-failure kinds and treats every other
@@ -154,7 +154,7 @@ export interface LoopHandle {
* 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
* session('assistant/message','usage') session records what actually ran
* session('assistant/message' {content, usage?}) session records what actually ran
* each tool-call in msg (sequential, abort-checked):
* session('tool/call'); ctx.tools.execute() ⟵ waterfall tools/execute
* session('tool/result')
@@ -313,41 +313,31 @@ async function runTurn(ctx: Context, agent: ReactLoopAgent, handle: LoopHandle,
return false
}
// Record a step/turn failure exactly once: append the single `error` event
// (only while the turn is still open — see below), set the error reason, and
// emit agent/error (contained — trap: a throwing agent/error listener must not
// re-escape and strand the turn). Disposal and abort set `reason` directly
// without calling this (no `error` event for those — they are not failures).
// Record a step/turn failure exactly once: set the error reason (carrying the
// failing `step` — the durable failure lives entirely on turn/end.reason, there
// is no separate session error event) and emit agent/error (contained — trap: a
// throwing agent/error listener must not re-escape and strand the turn).
// Disposal and abort set `reason` directly without calling this (they are not
// failures).
const failTurn = (err: CodedError): void => {
if (errorReported) return
errorReported = true
// Only append the session `error` INSIDE the turn (before turn/end). If the
// turn has already ended the only way here is a throwing agent/turn-end
// listener after closeTurn(true) already appended turn/end — appending now
// would land the error AFTER the last turn/end, where the persistence
// backend treats it as a crash tail and drops it on resume (the turn-enclosure RFC). In
// that case report via agent/error + the logger only; the turn is balanced.
// Set the error reason ONLY while the turn is still open — closeTurn appends
// turn/end with it. If the turn has already ended (the only way here: a
// throwing agent/turn-end listener after closeTurn(true) already appended
// turn/end), the reason can no longer affect the durable log, so log the late
// throw directly instead — otherwise the listener exception would vanish.
if (!turnEnded) {
// Set `reason` BEFORE the append: Session.append pushes the error event
// before notifying session/event listeners, so a throwing listener would
// otherwise leave `reason` unset (and closeTurn would record the wrong
// reason / the outer catch would skip closeTurn). The append is contained
// — the error event is already in the log either way; a throwing listener
// must not abort finalization.
reason = { kind: 'error', ...errorData(err) }
try {
session.append('error', { turn, step, ...errorData(err) })
} catch (appendError: unknown) {
ctx.logger.warn(`agent "${agent.id}": session/event listener threw on the error event at turn ${turn}: ${toError(appendError).message}`)
}
reason = { kind: 'error', step, ...errorData(err) }
} else {
ctx.logger.warn(`agent "${agent.id}": agent/turn-end listener threw after turn ${turn} closed: ${err.message}`)
}
try {
ctx.emit('agent/error', agent, turn, step, err)
} catch {
// contained: the error is already logged; a throwing agent/error
// listener must not prevent the turn from closing.
// contained: the error is already captured (on `reason`, or via the logger
// above); a throwing agent/error listener must not prevent the turn from
// closing.
}
}
@@ -608,11 +598,14 @@ async function runStep(
if (assembler.finish.kind === 'max-tokens') {
let message: Message = withoutToolCalls(assembler.message())
message = withoutToolCalls(await ctx.waterfall('agent/step-result', agent, turn, step, message, () => Promise.resolve(message)))
if (message.content.length > 0) {
session.append('assistant/message', { turn, step, content: message.content })
}
if (assembler.usage) {
session.append('usage', { turn, step, usage: assembler.usage })
// Fire the assistant/message when there is content OR usage: a max-tokens
// step can be cut off with empty content but still carry token accounting,
// and assistant/message is the only host for usage (there is no standalone
// usage event). An empty-content assistant/message is skipped by
// deriveMessages(), so hosting usage on it never injects a spurious assistant
// turn into derived history.
if (message.content.length > 0 || assembler.usage) {
session.append('assistant/message', { turn, step, content: message.content, ...(assembler.usage ? { usage: assembler.usage } : {}) })
}
return { hadToolCalls: false, finish: assembler.finish }
}
@@ -623,9 +616,13 @@ async function runStep(
let message: Message = assembler.message()
message = await ctx.waterfall('agent/step-result', agent, turn, step, message, () => Promise.resolve(message))
session.append('assistant/message', { turn, step, content: message.content })
if (assembler.usage) {
session.append('usage', { turn, step, usage: assembler.usage })
// Same content-or-usage guard as the max-tokens branch: a step that finishes
// with neither assembled content nor usage (e.g. a bare `stop` finish that
// streamed nothing) records no assistant/message — an empty-content message
// exists only to host usage, and deriveMessages() skips it either way, so
// appending one with no usage would be a pure trace-only row.
if (message.content.length > 0 || assembler.usage) {
session.append('assistant/message', { turn, step, content: message.content, ...(assembler.usage ? { usage: assembler.usage } : {}) })
}
// --- Tool execution (sequential; parallel execution is a TODO) ---
@@ -213,9 +213,9 @@ describe('toError normalization', () => {
expect(errors).toHaveLength(1)
expect(errors[0]!.message).toBe('naked string error')
// A non-Error throw is wrapped in a HarnessError with code UNKNOWN, so the
// session error event carries a routable code instead of degrading.
const errorEvent = agent.session.events.find(e => e.type === 'error')
expect(errorEvent?.type === 'error' && errorEvent.data.code).toBe('UNKNOWN')
// turn-end error reason carries a routable code instead of degrading.
const turnEnd = agent.session.events.find(e => e.type === 'turn/end')
expect(turnEnd?.type === 'turn/end' && turnEnd.data.reason.kind === 'error' && turnEnd.data.reason.code).toBe('UNKNOWN')
})
it('normalizes non-Error throws from agent/request waterfall via inline toError in runStep catch', async () => {
@@ -240,8 +240,8 @@ describe('toError normalization', () => {
expect(errors).toHaveLength(1)
// String() of { code: 500 } is '[object Object]'
expect(errors[0]!.message).toBe('[object Object]')
const errorEvent = agent.session.events.find(e => e.type === 'error')
expect(errorEvent?.type === 'error' && errorEvent.data.code).toBe('UNKNOWN')
const turnEnd = agent.session.events.find(e => e.type === 'turn/end')
expect(turnEnd?.type === 'turn/end' && turnEnd.data.reason.kind === 'error' && turnEnd.data.reason.code).toBe('UNKNOWN')
})
})
@@ -268,11 +268,11 @@ describe('coded error data emission', () => {
expect(errors).toHaveLength(1)
expect(errors[0]!.message).toBe('server overloaded')
// session error event includes the code
const errorEvent = agent.session.events.find(e => e.type === 'error')
expect(errorEvent).toBeDefined()
if (errorEvent!.type === 'error') {
expect(errorEvent!.data.code).toBe('RATE_LIMIT')
// turn-end error reason includes the code
const turnEnd = agent.session.events.find(e => e.type === 'turn/end')
expect(turnEnd).toBeDefined()
if (turnEnd?.type === 'turn/end' && turnEnd.data.reason.kind === 'error') {
expect(turnEnd.data.reason.code).toBe('RATE_LIMIT')
}
})
})
+68 -3
View File
@@ -58,11 +58,13 @@ describe('agent loop', () => {
const types = agent.session.events.map(e => e.type)
// turn/start opens the turn, THEN the queued user message is recorded inside
// it (every event is turn-enclosed), then assembled message + usage.
// it (every event is turn-enclosed), then the assembled message (carrying the
// step's usage).
expect(types[0]).toBe('turn/start')
expect(types[1]).toBe('user/message')
expect(types).toContain('assistant/message')
expect(types).toContain('usage')
const assistantMessage = agent.session.events.find(e => e.type === 'assistant/message')
expect(assistantMessage?.type === 'assistant/message' && assistantMessage.data.usage).toEqual({ inputTokens: 10, outputTokens: 'hello there'.length })
expect(types.at(-1)).toBe('turn/end')
// derived history: user + assistant
@@ -442,6 +444,66 @@ describe('agent loop', () => {
expect(agent.session.events.some(e => e.type === 'tool/call')).toBe(false)
expect(agent.session.deriveMessages()).toEqual([{ role: 'user', content: [{ type: 'text', text: 'go' }] }])
expect(reasons).toEqual([{ kind: 'max-tokens' }])
// No-data-loss: a max-tokens step whose only content was a dropped tool call
// has EMPTY assistant content, but its usage must still be represented. It
// rides on an (empty-content) assistant/message — there is no standalone
// usage event — and that empty message is skipped by deriveMessages(), so
// the derived history above is NOT corrupted by a spurious assistant turn.
const assistantMessage = agent.session.events.find(e => e.type === 'assistant/message')
expect(assistantMessage?.type === 'assistant/message' && assistantMessage.data).toEqual({
turn: 1, step: 1, content: [], usage: { inputTokens: 10, outputTokens: 5 },
})
})
it('appends no assistant/message for a max-tokens step with empty content and no usage', async () => {
// A max-tokens step truncated to a dropped tool call AND with no usage chunk
// has nothing to record: empty content and no accounting → no assistant/message
// (the empty-content host exists only to carry usage). The turn still ends
// max-tokens.
const callId = CallId('c1')
const adapter = new MockAdapter([[
{ type: 'block-start', index: 0, blockType: 'tool-call' },
{ type: 'tool-call-delta', index: 0, id: callId, name: 'echo', argumentsDelta: '{"text":"x"}' },
{ type: 'block-end', index: 0, block: { type: 'tool-call', id: callId, name: 'echo', arguments: '{"text":"x"}' } },
{ type: 'finish', reason: { kind: 'max-tokens' } },
]])
const ctx = await harness(adapter)
ctx.tools.register(defineTool({
name: 'echo',
description: '',
parameters: { text: { type: 'string' } },
async execute() { return [{ type: 'text', text: 'should not run' }] },
}))
const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
const reasons: TurnEndReason[] = []
ctx.on('agent/turn-end', (_agent, _turn, reason) => void reasons.push(reason))
send(agent, 'go')
await waitForIdle(ctx, agent)
expect(reasons).toEqual([{ kind: 'max-tokens' }])
expect(agent.session.events.some(e => e.type === 'assistant/message')).toBe(false)
expect(agent.session.deriveMessages()).toEqual([{ role: 'user', content: [{ type: 'text', text: 'go' }] }])
})
it('appends no assistant/message for a normal stop finish with empty content and no usage', async () => {
// A clean `stop` finish that streamed nothing assembled (no blocks) and
// carried no usage chunk has nothing to record: the content-or-usage guard
// on the normal step path suppresses a pure trace-only empty assistant/message.
const adapter = new MockAdapter([[{ type: 'finish', reason: { kind: 'stop' } }]])
const ctx = await harness(adapter)
const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
const reasons: TurnEndReason[] = []
ctx.on('agent/turn-end', (_agent, _turn, reason) => void reasons.push(reason))
send(agent, 'go')
await waitForIdle(ctx, agent)
expect(reasons).toEqual([{ kind: 'completed' }])
expect(agent.session.events.some(e => e.type === 'assistant/message')).toBe(false)
expect(agent.session.deriveMessages()).toEqual([{ role: 'user', content: [{ type: 'text', text: 'go' }] }])
})
it('keeps safe max-tokens assistant content while dropping truncated tool calls', async () => {
@@ -563,7 +625,10 @@ describe('agent loop', () => {
expect(errors).toHaveLength(1)
expect(errors[0]!.message).toContain('script exhausted')
expect(reasons[0]).toMatchObject({ kind: 'error' })
expect(agent.session.events.some(e => e.type === 'error')).toBe(true)
// The durable failure lives entirely on turn/end.reason (with the failing
// step), not a standalone error event.
const turnEnd = agent.session.events.find(e => e.type === 'turn/end')
expect(turnEnd?.type === 'turn/end' && turnEnd.data.reason).toMatchObject({ kind: 'error', step: 1 })
})
it('disposing the loop fiber mid-turn stops the loop (HMR safety)', async () => {
@@ -1,4 +1,4 @@
import { describe, expect, it } from 'vitest'
import { describe, expect, it, vi } from 'vitest'
import { Context } from 'cordis'
import LlmService, { CallId, MessageSource, StreamChunk } from '@deepseek-ai/dsh-llm'
import SessionStore, { Session, SessionEvent, SessionId, TurnEndReason } from '@deepseek-ai/dsh-session'
@@ -492,11 +492,13 @@ describe('HIGH: a finish-error stream chunk ends the turn as error, not complete
send(agent, 'go')
await waitForIdle(ctx, agent)
expect(reasons).toEqual([{ kind: 'error', message: 'provider 401', code: 'AUTH' }])
expect(reasons).toEqual([{ kind: 'error', step: 1, message: 'provider 401', code: 'AUTH' }])
const events = [...agent.session.events]
expect(events.some(event => event.type === 'error'
&& event.data.message === 'provider 401' && event.data.code === 'AUTH')).toBe(true)
// The durable failure lives on turn/end.reason (with the failing step), not
// a standalone error event.
const turnEnd = events.find(event => event.type === 'turn/end')
expect(turnEnd?.type === 'turn/end' && turnEnd.data.reason).toEqual({ kind: 'error', step: 1, message: 'provider 401', code: 'AUTH' })
// Crucially: no assistant/message was logged for the failed step.
expect(events.some(event => event.type === 'assistant/message')).toBe(false)
})
@@ -515,7 +517,7 @@ describe('HIGH: a finish-error stream chunk ends the turn as error, not complete
send(agent, 'go')
await waitForIdle(ctx, agent)
expect(reasons).toEqual([{ kind: 'error', message: 'model stream aborted', code: 'ABORTED' }])
expect(reasons).toEqual([{ kind: 'error', step: 1, message: 'model stream aborted', code: 'ABORTED' }])
expect([...agent.session.events].some(event => event.type === 'assistant/message')).toBe(false)
})
@@ -533,7 +535,7 @@ describe('HIGH: a finish-error stream chunk ends the turn as error, not complete
send(agent, 'go')
await waitForIdle(ctx, agent)
expect(reasons).toEqual([{ kind: 'error', message: 'codeless failure' }])
expect(reasons).toEqual([{ kind: 'error', step: 1, message: 'codeless failure' }])
})
})
@@ -592,7 +594,7 @@ describe('P1-5: a started turn (and any open step) is always closed on a boundar
turnEnd: e.filter(x => x.type === 'turn/end').length,
stepStart: e.filter(x => x.type === 'step/start').length,
stepEnd: e.filter(x => x.type === 'step/end').length,
errors: e.filter(x => x.type === 'error').length,
errors: e.filter(x => x.type === 'turn/end' && x.data.reason.kind === 'error').length,
lastTurnEnd: e.findLast(x => x.type === 'turn/end'),
}
}
@@ -611,10 +613,10 @@ describe('P1-5: a started turn (and any open step) is always closed on a boundar
await waitForIdle(ctx, agent)
const c = boundaryCounts(agent)
// turn opened and closed; no step ran; exactly one error logged + emitted.
// turn opened and closed; no step ran; exactly one error turn-end + emitted.
expect(c).toMatchObject({ turnStart: 1, turnEnd: 1, stepStart: 0, stepEnd: 0, errors: 1 })
expect(errors.map(e => e.message)).toEqual(['boom turn-start'])
expect(c.lastTurnEnd?.type === 'turn/end' && c.lastTurnEnd.data.reason).toEqual({ kind: 'error', message: 'boom turn-start' })
expect(c.lastTurnEnd?.type === 'turn/end' && c.lastTurnEnd.data.reason).toEqual({ kind: 'error', step: 0, message: 'boom turn-start' })
// model was never called (we threw before the step's request).
expect(adapter.requests).toHaveLength(0)
})
@@ -664,7 +666,7 @@ describe('P1-5: a started turn (and any open step) is always closed on a boundar
expect(c.turnStart).toBe(1)
expect(c.turnEnd).toBe(1)
expect(c.stepStart).toBe(c.stepEnd)
expect(c.lastTurnEnd?.type === 'turn/end' && c.lastTurnEnd.data.reason).toMatchObject({ kind: 'error', message: 'provider 500' })
expect(c.lastTurnEnd?.type === 'turn/end' && c.lastTurnEnd.data.reason).toMatchObject({ kind: 'error', step: 1, message: 'provider 500' })
// loop survives: a second turn runs to completion (invariants oracle would
// throw on its turn/start if turn 1 had been left open).
@@ -701,8 +703,8 @@ describe('P1-5: a started turn (and any open step) is always closed on a boundar
expect(turnStarts).toBe(1)
expect(turnEnds).toBe(1) // balanced — the turn was closed despite disposal
expect(reasons).toEqual([{ kind: 'disposed' }])
// no error event: disposal is not a failure.
expect(e.some(x => x.type === 'error')).toBe(false)
// no error reason: disposal is not a failure.
expect(e.some(x => x.type === 'turn/end' && x.data.reason.kind === 'error')).toBe(false)
})
it('preserves reason disposed when the turn-end emit throws during disposal (outer-catch disposed branch)', async () => {
@@ -741,9 +743,10 @@ describe('P1-5: a started turn (and any open step) is always closed on a boundar
expect(e.filter(x => x.type === 'turn/start')).toHaveLength(1)
const turnEnd = e.findLast(x => x.type === 'turn/end')
expect(turnEnd?.type === 'turn/end' && turnEnd.data.reason).toEqual({ kind: 'disposed' })
// The throwing turn-end listener is contained: no error event is logged and
// no agent/error is emitted (disposal is not a failure; the throw is swallowed).
expect(e.some(x => x.type === 'error')).toBe(false)
// The throwing turn-end listener is contained: the turn/end carries the
// disposed reason (not an error) and no agent/error is emitted (disposal is
// not a failure; the throw is swallowed).
expect(e.some(x => x.type === 'turn/end' && x.data.reason.kind === 'error')).toBe(false)
expect(errorEmits).toHaveLength(0)
})
@@ -803,6 +806,7 @@ describe('P1-5: a started turn (and any open step) is always closed on a boundar
ctx.on('agent/turn-end', () => { if (!threw) { threw = true; throw new Error('boom turn-end') } })
const errors: Error[] = []
ctx.on('agent/error', (_a, _t, _s, error) => void errors.push(error))
const warn = vi.spyOn(ctx.logger, 'warn').mockImplementation(() => undefined)
send(agent, 'go')
await waitForIdle(ctx, agent)
@@ -812,6 +816,9 @@ describe('P1-5: a started turn (and any open step) is always closed on a boundar
expect(c.errors).toBe(0) // NO session error event (it would be post-turn/end)
expect(agent.session.events.at(-1)?.type).toBe('turn/end') // last event is the boundary
expect(errors.map(e => e.message)).toEqual(['boom turn-end']) // surfaced via agent/error
// The late throw is also logged directly: failTurn's turn-already-ended
// branch warns so a throwing turn-end listener after turn/end never vanishes.
expect(warn).toHaveBeenCalledWith(expect.stringContaining('agent/turn-end listener threw after turn 1 closed'))
// The whole log is loadable (nothing dropped): a fresh replay sees the turn.
const replay = new Session(SessionId('replay'), [...agent.session.events])
expect(replay.deriveMessages().map(m => m.role)).toEqual(['user', 'assistant'])
@@ -840,11 +847,11 @@ describe('P1-5: a started turn (and any open step) is always closed on a boundar
await waitForIdle(ctx, agent)
const c = boundaryCounts(agent)
// step opened and closed; exactly one error; turn balanced; turn ends error.
// step opened and closed; exactly one error turn-end; turn balanced.
expect(c).toMatchObject({ turnStart: 1, turnEnd: 1, stepStart: 1, stepEnd: 1, errors: 1 })
expect(errors.map(e => e.message)).toEqual(['boom step-end'])
expect(c.lastTurnEnd?.type === 'turn/end' && c.lastTurnEnd.data.reason)
.toEqual({ kind: 'error', message: 'boom step-end' })
.toEqual({ kind: 'error', step: 1, message: 'boom step-end' })
// step/end precedes turn/end (ordering contract)
const e = [...agent.session.events]
@@ -882,12 +889,12 @@ describe('P1-5: a started turn (and any open step) is always closed on a boundar
await waitForIdle(ctx, agent)
const c = boundaryCounts(agent)
// exactly one error event + one agent/error emit, despite two failTurn calls.
// exactly one error turn-end + one agent/error emit, despite two failTurn calls.
expect(c.errors).toBe(1)
expect(errors.map(e => e.message)).toEqual(['provider down'])
expect(c.turnStart).toBe(1)
expect(c.turnEnd).toBe(1) // single turn/end, balanced
expect(c.lastTurnEnd?.type === 'turn/end' && c.lastTurnEnd.data.reason).toMatchObject({ kind: 'error', message: 'provider down' })
expect(c.lastTurnEnd?.type === 'turn/end' && c.lastTurnEnd.data.reason).toMatchObject({ kind: 'error', step: 1, message: 'provider down' })
// loop survives the compound failure.
send(agent, 'again')
@@ -895,42 +902,6 @@ describe('P1-5: a started turn (and any open step) is always closed on a boundar
expect(boundaryCounts(agent).turnEnd).toBe(2)
})
it('a throwing session/event listener on the error event still closes the turn (finalizer containment)', async () => {
// failTurn appends the `error` event; Session.append pushes it BEFORE
// notifying session/event listeners, so a throwing listener leaves `error`
// in the log but must NOT abort finalization — `reason` is set before the
// append and the throw is contained, so closeTurn(false) still runs and
// turn/end is appended (the turn is balanced, not left open).
// Plain harness (no invariants oracle): the throwing listener is itself a
// session/event subscriber. A finish-error drives the boundary-error path.
const errorStream: StreamChunk[] = [{ type: 'finish', reason: { kind: 'error', message: 'provider down' } }]
const adapter = new MockAdapter([errorStream, textResponse('turn 2 ok')])
const ctx = await harness(adapter)
const agent = ctx.agentLoop.create(AgentId('a-errthrow'), { model: 'mock' })
let threw = false
ctx.on('session/event', (_s, event) => {
if (!threw && event.type === 'error') { threw = true; throw new Error('boom error-event listener') }
})
send(agent, 'go')
await waitForIdle(ctx, agent)
const e = [...agent.session.events]
// The error event is in the log (pushed before the listener threw)…
expect(e.some(x => x.type === 'error')).toBe(true)
// …and the turn was still closed with the error reason (finalization did not
// abort): the last event is turn/end carrying the error reason.
const last = e.at(-1)
expect(last?.type).toBe('turn/end')
expect(last?.type === 'turn/end' && last.data.reason).toMatchObject({ kind: 'error', message: 'provider down' })
// loop survives: a second turn runs normally.
send(agent, 'again')
await waitForIdle(ctx, agent)
expect(adapter.requests).toHaveLength(2)
})
it('a throwing session/event listener on step/end during finalization still appends turn/end', async () => {
// A throwing agent/step-start listener drives the outer catch, which calls
// closeStep() during finalization. closeStep appends step/end; a
+2 -2
View File
@@ -37,7 +37,7 @@ Plain class (not a Cordis Service). Create via `ctx.sessions.create()`.
- `session.append(type, data): SessionEvent` — synchronous, never blocks on I/O. **Throws** if `data` is not losslessly JSON-serializable (BigInt, function, symbol, undefined, non-finite number, circular ref, or an exotic object like Map/Set/Date) — the event log is the durable source of truth, so this invariant is enforced at the source (exported as `isJsonValue` for backends to reuse on their replay/fork entry points).
- `session.deriveMessages(): Message[]` — derive the LLM message history from the event log. Raw `assistant/chunk` events are skipped; `context/message` and `steering/message` render as tagged synthetic user messages.
- `session.events`, `session.seq`, `session.id`
- `session.header: SessionHeader` — immutable creation metadata (`version`, `id`, `createdAt`, optional `cwd`/`parentSession`). Kept out of the event log (a storage concern, not replayable state); a minimal v1 header is synthesized for bare `Session` construction.
- `session.header: SessionHeader` — immutable creation metadata (`version`, `id`, `createdAt`, optional `cwd`/`parentSession`). Kept out of the event log (a storage concern, not replayable state); a minimal header (stamped with the current `SESSION_FORMAT_VERSION`) is synthesized for bare `Session` construction.
### Metadata types (`types.ts`)
@@ -45,7 +45,7 @@ Plain class (not a Cordis Service). Create via `ctx.sessions.create()`.
### Session event vocabulary (`types.ts`)
The append-only log: `turn/start`, `turn/end`, `step/start`, `step/end`, `user/message`, `assistant/message`, `assistant/chunk`, `tool/call`, `tool/result`, `steering/message`, `context/message`, `usage`, `error`.
The append-only log: `turn/start`, `turn/end`, `step/start`, `step/end`, `user/message`, `assistant/message`, `assistant/chunk`, `tool/call`, `tool/result`, `steering/message`, `context/message`. Token usage rides on `assistant/message.usage`; an operational error's step is on `turn/end.reason` for `kind: 'error'`.
Merge-extensible via `SessionEventMap` — a compaction plugin adds `compaction/marker`, etc.
+16 -9
View File
@@ -9,7 +9,7 @@
import { Context, Service } from 'cordis'
import { isAbsolute } from 'node:path'
import type { ContentBlock, Message, MessageSource } from '@deepseek-ai/dsh-llm'
import { SessionId } from './types.ts'
import { SESSION_FORMAT_VERSION, SessionId } from './types.ts'
import type { CreateSessionOptions, SessionEvent, SessionEventMap, SessionEventType, SessionHeader } from './types.ts'
import { isJsonValue } from './json.ts'
@@ -79,9 +79,10 @@ export class Session {
/**
* Immutable creation metadata (format version, cwd, lineage). Supplied by
* the store via `ctx.sessions.create()`. When a `Session` is constructed
* bare (tests, ad-hoc replay), a minimal v1 header is synthesized so
* `session.header` is always present. Kept out of the event log — it is a
* storage concern, not replayable conversation state.
* bare (tests, ad-hoc replay), a minimal header is synthesized (stamped with
* the current {@link SESSION_FORMAT_VERSION}) so `session.header` is always
* present. Kept out of the event log — it is a storage concern, not
* replayable conversation state.
*/
readonly header: SessionHeader
@@ -112,7 +113,7 @@ export class Session {
// structuredClone can never hit a non-cloneable value here.
this.log = seed.map(event => structuredClone(event))
}
this.header = header ?? { version: 1, id, createdAt: Date.now() }
this.header = header ?? { version: SESSION_FORMAT_VERSION, id, createdAt: Date.now() }
}
get events(): readonly SessionEvent[] {
@@ -160,7 +161,10 @@ export class Session {
*
* - `user/message` → user message
* - `assistant/message` → assistant message (chunks are skipped — they are
* replay/UI data; the assembled message is authoritative for history)
* replay/UI data; the assembled message is authoritative for history). An
* EMPTY-content assistant/message is skipped: a max-tokens step cut off with
* no content still records an assistant/message to host its `usage`, but a
* content-less assistant turn must not enter the provider transcript.
* - `tool/result` → user message carrying a tool-result block
* - `context/message` / `steering/message` → tagged synthetic user messages
* at their chronological position
@@ -177,8 +181,7 @@ export class Session {
const messages: Message[] = []
for (const event of this.log) {
// Intentionally non-exhaustive: only message-producing events derive
// history; turn/step boundaries, chunks, usage, and errors are
// trace/replay data.
// history; turn/step boundaries and chunks are trace/replay data.
// eslint-disable-next-line @typescript-eslint/switch-exhaustiveness-check
switch (event.type) {
case 'user/message': {
@@ -186,6 +189,10 @@ export class Session {
break
}
case 'assistant/message': {
// Skip an empty-content assistant/message: it exists only to host a
// max-tokens step's usage and must not inject a content-less assistant
// turn into the provider transcript.
if (event.data.content.length === 0) break
messages.push({ role: 'assistant', content: structuredClone(event.data.content) })
break
}
@@ -277,7 +284,7 @@ export class SessionStore extends Service {
throw new Error(`session cwd must be an absolute path, got "${cwd}"`)
}
const header: SessionHeader = {
version: 1,
version: SESSION_FORMAT_VERSION,
id: sessionId,
createdAt: options?.meta?.createdAt ?? Date.now(),
...cwd !== undefined ? { cwd } : {},
+36 -6
View File
@@ -9,6 +9,23 @@ export function SessionId(id: string): SessionId {
return id as SessionId
}
/**
* The on-disk session format version, stamped into every newly-written
* {@link SessionHeader} and enforced by every persistence backend on load. The
* single source of truth for the version — write sites and the load-time check
* all read it.
*
* It is **`0`** deliberately: while the harness is unreleased the on-disk format
* is **unstable / pre-release, with no compatibility implied**. Breaking changes
* to the persisted {@link SessionEventMap} shape (folding fields onto an event,
* removing a variant, …) happen freely and do NOT bump this — v0 absorbs all
* pre-release churn, and a backend simply REJECTS any log not at v0 (there is no
* migration; no persisted user data exists to preserve). A real, monotonically
* bumped version policy begins at the first tagged release, when a specific
* format boundary becomes worth distinguishing.
*/
export const SESSION_FORMAT_VERSION = 0
/**
* Immutable session metadata — written once at creation and never rewritten.
*
@@ -19,7 +36,11 @@ export function SessionId(id: string): SessionId {
* metadata) writes such a header.
*/
export interface SessionHeader {
/** On-disk format version; a persistence backend rejects unknown versions. */
/**
* On-disk format version, stamped from {@link SESSION_FORMAT_VERSION} when the
* session is created. A persistence backend rejects any other version on load
* (no migration — see the constant).
*/
version: number
/** The session's id (mirrors the {@link Session}'s id). */
id: SessionId
@@ -88,7 +109,13 @@ export type TurnTrigger = TurnTriggerMap[keyof TurnTriggerMap]
export interface TurnEndReasonMap {
completed: { kind: 'completed' }
aborted: { kind: 'aborted'; reason?: string }
error: { kind: 'error'; message: string; code?: string }
/**
* The turn failed: a step threw or the model reported a failure. `step` is the
* step number the failure occurred on (the operational error's location — the
* single durable record of an in-turn failure; live diagnostics also fire via
* `agent/error`). `code` is the error's code when one was attached.
*/
error: { kind: 'error'; step: number; message: string; code?: string }
disposed: { kind: 'disposed' }
'max-tokens': { kind: 'max-tokens' }
/**
@@ -140,14 +167,17 @@ export interface SessionEventMap {
'context/message': { content: ContentBlock[]; source: MessageSource }
/** Raw stream chunk — token-level replay fidelity. */
'assistant/chunk': { turn: number; step: number; chunk: StreamChunk }
/** Assembled assistant message for one step (derived history uses this). */
'assistant/message': { turn: number; step: number; content: ContentBlock[] }
/**
* Assembled assistant message for one step (derived history uses this).
* Carries the step's `usage` when the adapter reported token accounting, so
* the model output and its accounting travel together (there is no separate
* usage record). `usage` is absent when the adapter reported none.
*/
'assistant/message': { turn: number; step: number; content: ContentBlock[]; usage?: TokenUsage }
'tool/call': { turn: number; step: number; callId: CallId; name: string; arguments: string }
'tool/result': { turn: number; step: number; callId: CallId; content: ContentBlock[]; isError: boolean; error?: { name: string; code: string } }
/** Steering content injected between steps of a running turn. */
'steering/message': { turn: number; content: ContentBlock[]; source: MessageSource }
'usage': { turn: number; step: number; usage: TokenUsage }
'error': { turn: number; step: number; message: string; code?: string }
}
export type SessionEventType = keyof SessionEventMap
@@ -24,6 +24,7 @@ const textContentArb = fc.array(
const messageEventArb: fc.Arbitrary<Appendable> = fc.oneof(
textContentArb.map((content): Appendable => ({ type: 'user/message', data: { content, source: { kind: 'user' } } })),
textContentArb.map((content): Appendable => ({ type: 'assistant/message', data: { turn: 1, step: 1, content } })),
textContentArb.map((content): Appendable => ({ type: 'assistant/message', data: { turn: 1, step: 1, content, usage: { inputTokens: 1, outputTokens: 1 } } })),
fc.record({ id: fc.string({ minLength: 1 }), content: textContentArb, isError: fc.boolean() })
.map((r): Appendable => ({ type: 'tool/result', data: { turn: 1, step: 1, callId: CallId(r.id), content: r.content, isError: r.isError } })),
)
@@ -35,8 +36,6 @@ const nonMessageEventArb: fc.Arbitrary<Appendable> = fc.oneof(
fc.constant<Appendable>({ type: 'step/start', data: { turn: 1, step: 1 } }),
fc.constant<Appendable>({ type: 'step/end', data: { turn: 1, step: 1 } }),
fc.string().map((text): Appendable => ({ type: 'assistant/chunk', data: { turn: 1, step: 1, chunk: { type: 'text-delta', index: 0, text } } })),
fc.constant<Appendable>({ type: 'usage', data: { turn: 1, step: 1, usage: { inputTokens: 1, outputTokens: 1 } } }),
fc.constant<Appendable>({ type: 'error', data: { turn: 1, step: 1, message: 'x' } }),
)
const anyEventArb = fc.oneof(messageEventArb, nonMessageEventArb)
+6 -6
View File
@@ -1,7 +1,7 @@
import { describe, expect, it } from 'vitest'
import { Context } from 'cordis'
import { CallId } from '@deepseek-ai/dsh-llm'
import SessionStore, { Session, SessionEvent, SessionId } from '@deepseek-ai/dsh-session'
import SessionStore, { SESSION_FORMAT_VERSION, Session, SessionEvent, SessionId } from '@deepseek-ai/dsh-session'
describe('Session', () => {
it('derives message history from the event log', () => {
@@ -255,11 +255,11 @@ describe('SessionStore', () => {
expect(ctx.sessions.get(SessionId('lifecycle'))).toBeUndefined()
})
it('synthesizes a minimal v1 header for a bare-created session', async () => {
it('synthesizes a minimal current-version header for a bare-created session', async () => {
const ctx = new Context()
await ctx.plugin(SessionStore)
const session = ctx.sessions.create(SessionId('plain'))
expect(session.header).toMatchObject({ version: 1, id: 'plain' })
expect(session.header).toMatchObject({ version: SESSION_FORMAT_VERSION, id: 'plain' })
expect(typeof session.header.createdAt).toBe('number')
expect(session.header.cwd).toBeUndefined()
expect(session.header.parentSession).toBeUndefined()
@@ -272,7 +272,7 @@ describe('SessionStore', () => {
meta: { cwd: '/work/project', parentSession: SessionId('parent') },
})
expect(session.header).toMatchObject({
version: 1,
version: SESSION_FORMAT_VERSION,
id: 'child',
cwd: '/work/project',
parentSession: 'parent',
@@ -288,9 +288,9 @@ describe('SessionStore', () => {
expect(ctx.sessions.get(SessionId('rel'))).toBeUndefined()
})
it('a bare Session() constructed without the store still exposes a v1 header', () => {
it('a bare Session() constructed without the store still exposes a current-version header', () => {
const session = new Session(SessionId('bare'))
expect(session.header).toMatchObject({ version: 1, id: 'bare' })
expect(session.header).toMatchObject({ version: SESSION_FORMAT_VERSION, id: 'bare' })
expect(typeof session.header.createdAt).toBe('number')
})
@@ -25,7 +25,7 @@ The JSONL durable session-persistence backend — a concrete `SessionPersistence
- **Append-only.** Committed events (at or below a flushed `turn/end`) are never rewritten. Subsequent appends are line appends at EOF + `fsync`.
- **Crash recovery — close, don't truncate.** A crash can leave a log whose final turn never closed (real events after the last `turn/end`). `load` PRESERVES those events (a turn can be huge — they are real work) and closes the orphaned turn by durably appending synthetic boundary events: an error `tool/result` for every `tool-call` the crash left unanswered (the loop logs the assistant message before running the tools, so a mid-tool crash leaves dangling calls — and `deriveMessages()` would replay an assistant tool-call with no result, which providers reject), then a `step/end` if a step was open, then `turn/end {kind:'interrupted'}`, returning a balanced log. Only a never-fully-written **torn tail fragment** (a final line with no newline / unparseable) is `ftruncate`d away before the closers are written. See [session persistence](../../../docs/rfc/implemented/architecture/2026-06-14-session-persistence.md).
- **Contiguous-seq.** `load` rejects a mid-log parse error or `seq` gap (unloadable); `append` rejects a batch whose first `seq` does not continue the stored log, and rejects non-JSON-serializable `event.data` naming the offending event type.
- **Format version.** Only v1 is supported; `load` rejects an unknown version. While the harness is unreleased a format change bumps the version and rejects non-current logs — there is no migration (no persisted user data to preserve).
- **Format version.** Only the current `SESSION_FORMAT_VERSION` (v0) is supported; `load` rejects any other version. While the harness is unreleased the on-disk format is pre-release/unstable: a breaking format change is absorbed at v0 (no bump until the first tagged release) and non-current logs are rejected — there is no migration (no persisted user data to preserve).
## Write path
@@ -249,7 +249,7 @@ describe('SessionPersistenceJsonl: durability and crash semantics', () => {
it('path-traversal session ids are neutralized (no escape from root)', async () => {
const evil = SessionId('../../etc/pwn')
const m = { version: 1, id: evil, createdAt: 1 }
const m = { version: 0, id: evil, createdAt: 1 }
await ctx.sessionPersistence.create(m)
await ctx.sessionPersistence.append(evil, oneTurnLog())
// The file lives UNDER root, not at ../../etc.
@@ -310,7 +310,7 @@ describe('SessionPersistenceJsonl: scanLog unit', () => {
it('a seq gap after the last turn/end bounds the preserved tail (torn fragment tolerated)', () => {
const log = [
JSON.stringify({ type: 'session', version: 1, id: 'g', createdAt: 1 }),
JSON.stringify({ type: 'session', version: 0, id: 'g', createdAt: 1 }),
JSON.stringify({ type: 'turn/start', seq: 0, time: 1, data: { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } } }),
JSON.stringify({ type: 'step/start', seq: 2, time: 2, data: { turn: 1, step: 1 } }), // gap: missing seq 1
].join('\n') + '\n'
@@ -323,7 +323,7 @@ describe('SessionPersistenceJsonl: scanLog unit', () => {
it('rejects a seq gap BEFORE a later committed turn/end (committed data damaged)', () => {
const log = [
JSON.stringify({ type: 'session', version: 1, id: 'g2', createdAt: 1 }),
JSON.stringify({ type: 'session', version: 0, id: 'g2', createdAt: 1 }),
JSON.stringify({ type: 'turn/start', seq: 0, time: 1, data: { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } } }),
JSON.stringify({ type: 'step/start', seq: 2, time: 2, data: { turn: 1, step: 1 } }), // gap: missing seq 1
JSON.stringify({ type: 'turn/end', seq: 3, time: 3, data: { turn: 1, reason: { kind: 'completed' } } }),
@@ -335,7 +335,7 @@ describe('SessionPersistenceJsonl: scanLog unit', () => {
it('rejects a corrupt line BEFORE a later committed turn/end (committed data damaged)', () => {
const log = [
JSON.stringify({ type: 'session', version: 1, id: 'c', createdAt: 1 }),
JSON.stringify({ type: 'session', version: 0, id: 'c', createdAt: 1 }),
'{not json', // corrupt, sits in the committed region (a turn/end follows)
JSON.stringify({ type: 'turn/end', seq: 1, time: 2, data: { turn: 1, reason: { kind: 'completed' } } }),
].join('\n') + '\n'
@@ -343,7 +343,7 @@ describe('SessionPersistenceJsonl: scanLog unit', () => {
})
it('a header-only log (no event lines at all) preserves nothing — committedBytes is the header', () => {
const log = JSON.stringify({ type: 'session', version: 1, id: 'h0', createdAt: 1 }) + '\n'
const log = JSON.stringify({ type: 'session', version: 0, id: 'h0', createdAt: 1 }) + '\n'
const scanned = scanLog(Buffer.from(log))
expect(scanned.events).toEqual([])
// committedBytes falls back to the header line's end (no preserved events).
@@ -352,7 +352,7 @@ describe('SessionPersistenceJsonl: scanLog unit', () => {
it('a corrupt line after the last turn/end bounds the preserved tail', () => {
const log = [
JSON.stringify({ type: 'session', version: 1, id: 'c2', createdAt: 1 }),
JSON.stringify({ type: 'session', version: 0, id: 'c2', createdAt: 1 }),
JSON.stringify({ type: 'turn/start', seq: 0, time: 1, data: { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } } }),
'{not json', // corrupt crash fragment, no turn/end committed
].join('\n') + '\n'
@@ -363,7 +363,7 @@ describe('SessionPersistenceJsonl: scanLog unit', () => {
it('tolerates a seq gap AFTER a turn/end (uncommitted tail)', () => {
const log = [
JSON.stringify({ type: 'session', version: 1, id: 't', createdAt: 1 }),
JSON.stringify({ type: 'session', version: 0, id: 't', createdAt: 1 }),
JSON.stringify({ type: 'turn/start', seq: 0, time: 1, data: { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } } }),
JSON.stringify({ type: 'turn/end', seq: 1, time: 2, data: { turn: 1, reason: { kind: 'completed' } } }),
JSON.stringify({ type: 'step/start', seq: 9, time: 3, data: { turn: 2, step: 1 } }), // gap in uncommitted tail
@@ -442,7 +442,7 @@ describe('SessionPersistenceJsonl: edge cases', () => {
// field is tolerated by the header type guard) and confirm list() reads it.
const bucket = join(root, '_no-cwd')
await mkdir(bucket, { recursive: true })
const bigHeader = JSON.stringify({ type: 'session', version: 1, id: 'big', createdAt: 1, pad: 'x'.repeat(9000) })
const bigHeader = JSON.stringify({ type: 'session', version: 0, id: 'big', createdAt: 1, pad: 'x'.repeat(9000) })
await writeFile(join(bucket, 'big.jsonl'), bigHeader + '\n')
const ids = (await ctx.sessionPersistence.list()).map(x => x.id)
expect(ids).toContain('big')
@@ -25,7 +25,7 @@
*/
import { Context } from 'cordis'
import { interruptedTurnClosers } from '@deepseek-ai/dsh-session'
import { interruptedTurnClosers, SESSION_FORMAT_VERSION } from '@deepseek-ai/dsh-session'
import type { Session, SessionEvent, SessionId, SessionHeader } from '@deepseek-ai/dsh-session'
import { assertSerializable, seedCoversPrefix } from './index.ts'
@@ -319,8 +319,8 @@ export class PersistenceCoordinator<TornMarker = unknown> {
}
private assertVersion(meta: SessionHeader): void {
if (meta.version !== 1) {
throw new Error(`unsupported session format version ${meta.version} for "${meta.id}" (only v1 is supported)`)
if (meta.version !== SESSION_FORMAT_VERSION) {
throw new Error(`unsupported session format version ${meta.version} for "${meta.id}" (only v${SESSION_FORMAT_VERSION} is supported)`)
}
}
@@ -9,7 +9,7 @@
*/
import { describe, expect, it } from 'vitest'
import { SessionId } from '@deepseek-ai/dsh-session'
import { SESSION_FORMAT_VERSION, SessionId } from '@deepseek-ai/dsh-session'
import type { SessionEvent, SessionHeader } from '@deepseek-ai/dsh-session'
import { CallId } from '@deepseek-ai/dsh-llm'
import type { SessionPersistence } from '../src/index.ts'
@@ -23,7 +23,7 @@ export interface ContractBackend {
/** Build a minimal {@link SessionHeader} for a session id. */
export function meta(id: string, cwd?: string): SessionHeader {
return {
version: 1,
version: SESSION_FORMAT_VERSION,
id: SessionId(id),
createdAt: 1000,
...cwd !== undefined ? { cwd } : {},
@@ -57,7 +57,7 @@ export function runPersistenceContract(name: string, make: () => Promise<Contrac
await persistence.append(m.id, log)
const loaded = await persistence.load(m.id)
expect(loaded.meta).toMatchObject({ version: 1, id: m.id, cwd: '/work' })
expect(loaded.meta).toMatchObject({ version: SESSION_FORMAT_VERSION, id: m.id, cwd: '/work' })
expect(loaded.events).toEqual(log)
} finally {
await dispose()
@@ -28,7 +28,7 @@
import { describe, expect, it } from 'vitest'
import { Context, type Fiber } from 'cordis'
import SessionStore, { SessionId } from '@deepseek-ai/dsh-session'
import SessionStore, { SESSION_FORMAT_VERSION, SessionId } from '@deepseek-ai/dsh-session'
import type { Session, SessionEvent } from '@deepseek-ai/dsh-session'
import type { SessionPersistence } from '../src/index.ts'
import { meta, oneTurnLog } from './contract.ts'
@@ -671,7 +671,7 @@ export function runCoordinatorContract(name: string, makeFixture: () => Promise<
const fix = await makeFixture()
const { ctx, fiber } = await freshCtx(fix)
try {
const m = { version: 2, id: SessionId('v2'), createdAt: 1, cwd: WORK }
const m = { version: 99, id: SessionId('v99'), createdAt: 1, cwd: WORK }
await ctx.sessionPersistence.create(m)
await ctx.sessionPersistence.append(m.id, oneTurnLog())
await expect(ctx.sessionPersistence.load(m.id)).rejects.toThrow(/version/)
@@ -685,7 +685,7 @@ export function runCoordinatorContract(name: string, makeFixture: () => Promise<
const fix = await makeFixture()
const { ctx, fiber } = await freshCtx(fix)
try {
const m = { version: 1, id: SessionId('forked-child'), createdAt: 1, cwd: WORK, parentSession: SessionId('the-parent') }
const m = { version: SESSION_FORMAT_VERSION, id: SessionId('forked-child'), createdAt: 1, cwd: WORK, parentSession: SessionId('the-parent') }
await ctx.sessionPersistence.create(m)
await ctx.sessionPersistence.append(m.id, oneTurnLog())
const loaded = await ctx.sessionPersistence.load(m.id)
+2 -2
View File
@@ -192,8 +192,8 @@ function checkEvent(trace: SessionTrace, event: SessionEvent): void {
// turn as its commit/replay boundary (the JSONL backend treats anything
// after the last turn/end as a crash tail), so a bare event between turns is
// silently dropped on reload. The loop records queued user messages after
// turn/start, an idle agent.inject() wraps its context/message in a one-shot
// turn, and usage/error are only appended inside an open turn. A `default`
// turn/start, and an idle agent.inject() wraps its context/message in a
// one-shot turn. A `default`
// (not an enumerated list) is deliberate: SessionEventMap is
// merge-extensible, so a PLUGIN-added event type appended while idle must
// also fail here rather than fall through and be dropped on resume.
@@ -95,14 +95,12 @@ describe('session-log invariants', () => {
.toThrow(/outside any open turn/)
})
it('rejects usage/error and plugin-added events appended outside any open turn', async () => {
it('rejects steering and plugin-added events appended outside any open turn', async () => {
const { ctx } = await setup({ freeze: false })
const session = ctx.sessions.create()
// usage and error are turn-scoped: outside a turn they would land past the
// steering/message is turn-scoped: outside a turn it would land past the
// commit boundary and be dropped on resume (the turn-enclosure RFC).
expect(() => session.append('usage', { turn: 1, step: 1, usage: { inputTokens: 1, outputTokens: 1 } }))
.toThrow(/outside any open turn/)
expect(() => session.append('error', { turn: 1, step: 1, message: 'boom' }))
expect(() => session.append('steering/message', { turn: 1, content: [{ type: 'text', text: 'go' }], source: { kind: 'user' } }))
.toThrow(/outside any open turn/)
// A PLUGIN-added (merge-extensible) event type is caught by the default too.
expect(() => session.append('compaction/marker' as never, { foo: 'bar' } as never))
@@ -156,7 +154,7 @@ describe('session-log invariants', () => {
session.append('step/start', { turn: 1, step: 1 })
session.append('tool/call', { turn: 1, step: 1, callId: CallId('c1'), name: 'echo', arguments: '{}' })
session.append('step/end', { turn: 1, step: 1 })
session.append('turn/end', { turn: 1, reason: { kind: 'error', message: 'boom' } })
session.append('turn/end', { turn: 1, reason: { kind: 'error', step: 1, message: 'boom' } })
}).not.toThrow()
})
@@ -33,7 +33,7 @@ const TEXT_CHUNKS: StreamChunk[] = [
/** Build a minimal session-JSONL string: a header line + the given events. */
function sessionJsonl(events: SessionEvent[]): string {
const header = JSON.stringify({ type: 'session', version: 1, id: 's1', createdAt: 0 })
const header = JSON.stringify({ type: 'session', version: 0, id: 's1', createdAt: 0 })
return [header, ...events.map(e => JSON.stringify(e))].join('\n') + '\n'
}
@@ -67,7 +67,7 @@ describe('parseSessionLog', () => {
})
it('ignores blank lines', () => {
const header = JSON.stringify({ type: 'session', version: 1, id: 's1', createdAt: 0 })
const header = JSON.stringify({ type: 'session', version: 0, id: 's1', createdAt: 0 })
const ev = chunkEvent(1, 1, 1, TEXT_CHUNKS[0] as StreamChunk)
expect(parseSessionLog(`${header}\n\n${JSON.stringify(ev)}\n\n`)).toEqual([ev])
})
@@ -130,11 +130,11 @@ describe('deriveReplayScript', () => {
})
it('throws on a group that lacks a terminal finish chunk (a thrown stream)', () => {
// A thrown stream(): prefix chunks logged, then error/turn/end, NO finish.
// A thrown stream(): prefix chunks logged, then turn/end (error reason), NO finish.
const events: SessionEvent[] = [
chunkEvent(1, 1, 1, { type: 'block-start', index: 0, blockType: 'text' }),
chunkEvent(2, 1, 1, { type: 'text-delta', index: 0, text: 'par' }),
{ type: 'turn/end', seq: 3, time: 0, data: { turn: 1, reason: { kind: 'error', message: 'x' } } },
{ type: 'turn/end', seq: 3, time: 0, data: { turn: 1, reason: { kind: 'error', step: 1, message: 'x' } } },
]
expect(() => deriveReplayScript(events)).toThrow(/without a finish chunk.*replay\.override\.json/s)
})
+2 -2
View File
@@ -87,7 +87,7 @@ These are capabilities the bridge would *drive* on the editor. The harness runs
| `available_commands_update` | S | ❌ | ✅ | ✅ | No slash commands advertised. |
| `current_mode_update` | S | ❌ | ✅ | ✅ | No session modes. |
| `config_option_update` | S | ❌ | ✅ | ✅ | No config options. |
| `usage_update` | S | ❌ | ✅ | ✅ | Token/cost reporting not surfaced (the harness HAS usage events internally). |
| `usage_update` | S | ❌ | ✅ | ✅ | Token/cost reporting not surfaced (the harness records token usage internally on `assistant/message`). |
| `session_info_update` | S | ❌ | ⚠️ | ⚠️ | Session title/metadata not pushed. |
## 5. Tool-call rendering
@@ -148,7 +148,7 @@ Ranked by how commonly the reference adapters ship them and how much UX they unl
6. **MCP passthrough** (`mcpServers` on `session/new` + `mcpCapabilities`).
7. **Richer prompt content** — image / embedded `resource` blocks (needs a multimodal model path).
8. **Diff + location tool rendering**`diff` content and `locations` for edit tools.
9. **Usage reporting** (`usage_update`) — the harness already has the internal usage events.
9. **Usage reporting** (`usage_update`) — the harness already records token usage internally (on `assistant/message`).
10. **Editor filesystem delegation** (`fs/read_text_file` / `fs/write_text_file`) — lets the agent see unsaved buffers; lower priority since the harness has direct disk access.
## Out of scope
+2 -2
View File
@@ -775,7 +775,7 @@ function validateMcpServers(params: { mcpServers?: unknown[] }): void {
* generic fallback (title = tool name, raw args as input) when no registry is
* available (e.g. pure translator tests).
*
* Other event types (turn/step boundaries, context/message, usage, …) produce
* Other event types (turn/step boundaries, context/message, …) produce
* no client update.
*/
export function streamSessionEventUpdate(
@@ -873,7 +873,7 @@ export function streamSessionEventUpdate(
})
return
}
// turn/step boundaries, context/message, steering, usage, error,
// turn/step boundaries, context/message, steering,
// assistant/message — no direct ACP client update.
default:
return
+1 -1
View File
@@ -16,7 +16,7 @@ describe('turnEndToStopReason', () => {
expect(turnEndToStopReason({ kind: 'max-tokens' })).toBe('max_tokens')
expect(turnEndToStopReason({ kind: 'aborted', reason: 'x' })).toBe('cancelled')
expect(turnEndToStopReason({ kind: 'disposed' })).toBe('cancelled')
expect(turnEndToStopReason({ kind: 'error', message: 'boom' })).toBe('end_turn')
expect(turnEndToStopReason({ kind: 'error', step: 1, message: 'boom' })).toBe('end_turn')
})
it('falls back to end_turn for an unknown (merge-extensible) future kind', () => {
+3 -3
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@@ -3,7 +3,7 @@ import { mkdtemp, rm } from 'node:fs/promises'
import { tmpdir } from 'node:os'
import { join } from 'node:path'
import { PROTOCOL_VERSION } from '@agentclientprotocol/sdk'
import { SessionId } from '@deepseek-ai/dsh-session'
import { SESSION_FORMAT_VERSION, SessionId } from '@deepseek-ai/dsh-session'
import { AgentId } from '@deepseek-ai/dsh-agent'
import { makeBridgeHarness, textResponse, toolCallResponse, type BridgeHarness, type CapturedUpdate } from './harness.ts'
@@ -167,7 +167,7 @@ describe('acp bridge — session/load replay', () => {
loader = await makeBridgeHarness({ storageDir, script: [] })
const otherCwd = '/some/other/workspace'
await loader.ctx.sessionPersistence.create({
version: 1, id: SessionId('elsewhere'), createdAt: 1, cwd: otherCwd,
version: SESSION_FORMAT_VERSION, id: SessionId('elsewhere'), createdAt: 1, cwd: otherCwd,
})
await loader.ctx.sessionPersistence.append(SessionId('elsewhere'), [
{ type: 'turn/start', seq: 0, time: 0, data: { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } } },
@@ -204,7 +204,7 @@ describe('acp bridge — session/load replay', () => {
// to the server's launch dir (the request cwd does not override the header).
loader = await makeBridgeHarness({ storageDir, script: [] })
await loader.ctx.sessionPersistence.create({
version: 1, id: SessionId('legacy'), createdAt: 1, // no cwd
version: SESSION_FORMAT_VERSION, id: SessionId('legacy'), createdAt: 1, // no cwd
})
await loader.ctx.sessionPersistence.append(SessionId('legacy'), [
{ type: 'turn/start', seq: 0, time: 0, data: { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } } },
+1 -1
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@@ -116,7 +116,7 @@ describe('streamSessionEventUpdate', () => {
it('produces no update for boundary/other event types', () => {
expect(updatesFor(evt('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } }))).toEqual([])
expect(updatesFor(evt('turn/end', { turn: 1, reason: { kind: 'completed' } }))).toEqual([])
expect(updatesFor(evt('usage', { turn: 1, step: 1, usage: { inputTokens: 1, outputTokens: 1 } }))).toEqual([])
expect(updatesFor(evt('step/start', { turn: 1, step: 1 }))).toEqual([])
})
})