Two review responses that belong together — the same review argued the
engine was defending the wrong threat while a benign-input bug wedged
the product.
1) Drop hostile-value containment; state the trust premise.
Scripts are model-written — the same trust level as the model's bash
access — yet successive pre-push review rounds had ratcheted in defenses
that only matter against an adversarial author: trap-free proxy
rejection, accessor-never-invoked descriptor walks, realm-side
pre-rendering of thrown values, realm-built promises/arrays/error clones
with structural fatal recognition. That same author keeps a documented,
accepted, unkillable event-loop spin, so containing its error VALUES is
cost without a threat model — and the planned hardened engine
(worker/isolated-vm) gets value isolation by serialization and deletes
all of this machinery anyway.
What stays, because benign scripts hit it constantly: result never
rejects; dropped hook promises cannot become unhandled rejections; the
value boundary rejects LOUD everything JSON cannot carry (now a plain
recursive walk — getters are read ordinarily and their result is what
crosses; a throwing read fails loud); a "__proto__" key still copies as
a data property; the fatal-vs-null combinator discipline (now host
instanceof — unforgeable from the realm and simpler than clone-shape
recognition). What changes for scripts (documented in the engine
README): hooks hand back host values and host errors — in-script
`instanceof Error` on a hook failure is false (branch on e.name/e.code)
— and args are host-cloned once so a script cannot mutate the caller's
object. realm.ts drops 289 → 173 lines; the hostile-value test tables go
with it. The premise now leads the engine module doc, the README, and
the RFC's engine section, with the removed machinery recorded under
What was rejected.
2) result settles within the dispose grace of a cancellation.
Review finding (verified through the real registry + tool + engine): a
script parked on a promise no hook owns — `await new Promise(() => {})`,
`await Promise.race([])`, a returned never-settling thenable — could not
be settled by cancel(): hooks reject and children abort, but nothing
touches a promise the engine does not own, so `result` stayed pending
FOREVER (the previous cut even pinned that as intended). The tool awaits
run.result BEFORE its disposing finally, the registry awaits the tool,
the loop awaits the registry — one such script wedged the whole agent
turn past any abort, unrecoverable in-process; the mock engine in the
tool's abort test settles result on cancel, which is exactly the
behavior the real engine lacked, so no existing test could see it.
The seam contract now says it out loud: once a run is cancelled, result
SETTLES within the implementation's bounded grace even if the script
never does. The vm engine arms an abandon channel in cancel(); drive()
races the script against it, force-settling 'cancelled' at the grace
(the abandoned settlement stays contained; a post-slice synchronous spin
remains the documented limitation). dispose()'s outer race now exists
for child quiescence only, and `workflow/end` again fires exactly once
per started run. The old 'result stays pending' pin is FLIPPED to the
new contract (the pinned behavior was the bug); new regressions cover
cancel-then-settle on a parked script, a never-settling returned
thenable, and the full composition through the REAL registry + tool +
vm engine (tool-workflow gains workflow-vm/subagent devDeps for it).
agentsStarted JSDoc clarified while touching the vocabulary (accepted
calls, including ones still queued at cancellation).
Six verified A-findings from the code-stage review, each with a regression test:
- parallel()/pipeline() resolved to HOST arrays inside the vm realm, exposing
host Array.prototype to scripts; combinator results are now realm-built
(in-realm Array.from bound at context setup).
- materializeFromRealm ran proxy traps (ownKeys/getOwnPropertyDescriptor/
getPrototypeOf) during the descriptor walk — realm code on the host stack,
outside the vm timeout, escaping as raw errors; proxies (root, nested, and
in the prototype position) are now rejected trap-free via util.types.isProxy
before any inspection.
- an already-aborted signal or an immediate cancel() no longer reports
'completed' for a hook-free script: drive() checks cancellation before
running the body and again when the script settles.
- dispose() now waits (bounded by disposeGraceMs) for stray agent() children
to FINISH disposing, not just for the script to settle: every agent() call
is tracked and quiesce() drains the in-flight set.
- workflow/* event payloads were live mutable aliases shared across emissions;
emitWorkflowEvent now hands each listener its own structural clone.
- the structured-output turn-continuation veto is now prepend: true, so an
earlier-registered force-continue listener cannot short-circuit it.
Docs updated in the same change (READMEs, core-data-structures/workflow.md,
the dynamic-workflows RFC, regenerated cordis catalogs).
A new capability family at packages/workflow/ in the bash seam shape,
modeled on Claude Code's dynamic workflows: the model writes a JavaScript
orchestration script (export const meta = {...} + plain-JS body), a runtime
executes it, and the script — not the conversation — holds the loop, the
branching, and the intermediate results.
- dsh-workflow (ctx.workflows): abstract WorkflowService + run vocabulary
(WorkflowRun whose result NEVER rejects) + observe-only workflow/* events
carrying data snapshots (id + meta, never the live run), per-listener
contained like subagent/*.
- dsh-workflow-vm: in-process node:vm engine. Meta extraction via a
string/comment-aware scanner (template interpolation rejected; literal
evaluated alone in an empty timed context; statement blanked line-
preservingly so stacks keep script line numbers). Hooks: agent(prompt,
{label, phase, schema, model}) over ctx.subagents, parallel(), pipeline()
(no cross-stage barrier), phase(), log(), args. Fatal-vs-null discipline:
hook misuse (unknown/deferred options, bad arguments, unsupported
schemas, tripped caps, seam start failures, cancellation) throws fatal
WorkflowErrors the combinators RE-THROW — never dissolved into the
per-item null reserved for child failures. Realm boundary: inbound values
materialized by descriptor walks that never invoke accessors (defineProperty
copies, __proto__-safe); outbound values rebuilt in-realm via the
context's own JSON.parse. Determinism bans (Date.now/Math.random/argless
new Date) kept so future resume support cannot break scripts. Caps and
timeouts are validated Config. Every hook promise carries a no-op
rejection consumer (app-boot exits on unhandled rejections).
- dsh-tool-workflow: the model-facing workflow tool, synchronous like
dsh-tool-subagent (start → await → try/finally dispose; abort bridged;
non-completed → isError). Generic render card titled by a textual
meta.name sniff. The tool description carries the authoring contract.
Wired into examples/{coding-agent,acp-agent} with explicit-ask-only
guidance. Coverage at every tier: unit (meta scanner, materializer incl.
counting-getter and __proto__ regressions, combinator semantics,
concurrency ceiling, caps, cancellation, no-unhandled-rejection abandon),
integration over the real spawn stack, with-key e2e (real two-phase run +
the tool through the registry pipeline), and a recorded ACP snapshot
scenario (workflow-run, 1 child session). RFC:
docs/rfc/implemented/feature/2026-07-05-dynamic-workflows.md (deferred
work explicitly listed). AGENTS.md budget 1575 → 1590 for the new group's
layout line.
The seam vocabulary (SubagentStartRequest.outputSchema, SubagentResult
.structured) existed but no in-process backend honored it — spawn/fork
advertised outputSchema: false. This lands the missing half:
- dsh-tools gains a structured-output JSON Schema subset (json-schema.ts):
StructuredOutputSchema, assertSupportedOutputSchema (rejects loud outside
the enforced subset, every violation listed), validateStructuredValue
(path-qualified issues, total). outputSchema's seam type becomes this raw
JSON-Schema subset instead of the author-facing SchemaSpec DSL — the schema
travels verbatim to the model as a forced tool's parameters.
- dsh-subagent-inprocess gains the shared structured runtime: one global
structured_output capture tool (placeholder parameters) + a prepend:true
agent/request listener doing FINAL-REQUEST enforcement (strip for plain
agents, per-run schema for structured children — survives downstream
request-replacing listeners) + an agent/turn-continuation veto that stops
a child's turn once captured (no wasted extra model step). Lifetime is
refcounted by backends (plugin lifetime) AND live runs (start→settle).
- startInProcessRun drives the capture: subset asserted before the child
exists, instruction appended to the child's system prompt, clean-finish
nudge loop (structuredNudgeRetries, backend Config, default 1), captured
value on result.structured; a clean finish without a capture settles
'error' (never a silent success with a missing field).
- spawn + fork flip outputSchema: true and inject 'tools'.
gen-cordis-catalog.ts now emits docs/cordis-catalog/events.md and
docs/cordis-catalog/services.md instead of the combined
events-and-services.md: a reader is either finding what to listen to or
what to call, and each axis now scans and deep-links as its own page.
Headings promote one level (scopes and ctx.<key> entries become H2), the
dispatch-mode legend lives on the events page, and the inherited tier
splits accordingly. --check verifies both files and names whichever is
stale.
Every reference updated in the same change (no compat redirects,
pre-release stance): architecture.md, AGENTS.md, docs/AGENTS.md tier row,
filesystem/subagent core-data-structures pages (the ctx.fs anchor
survives — slugs are heading-level-independent), fs README, four RFCs,
the tool-catalog and persistence-catalog generator intros (both
regenerated), and the bilingual development.md pair (re-recorded).
docs/persistence-catalog/log-events.md enumerates every SessionEventMap
member — the owning dsh-session vocabulary plus the dsh-compact and
dsh-hook-protocol declaration merges — with payload, surface/log-only badge,
JSDoc prose, and declaration site. scripts/gen-persistence-catalog.ts is a
pure AST pass in the gen-cordis-catalog mold: verify-persistence-catalog
(--check) joins doc-sync, so a stale committed catalog fails pre-push and CI.
The walk enforces JSDoc completeness (every member needs description prose;
@mode is rejected as a category error — log events do not dispatch on the
cordis bus), derives the surface badge from the SurfaceEventType union with a
stale-member cross-check, and hard-errors on duplicate declarations. Payloads
render through the TypeScript printer so newline-separated multi-line type
literals still emit valid one-line fragments.
Documented the five previously JSDoc-less core events (turn/step boundaries,
tool/call), removed the two stray @mode tags on the hook/* merges, and
replaced the hand-restated event enumerations (session.md hook/* table,
compact README table, hook-protocol README bullets, session README name-list
— whose merge note had already drifted) with links to the catalog. RFC:
docs/rfc/implemented/process/2026-07-04-persistence-log-catalog.md.
GenerateOptions.prefill had no production setter and both adapters
rejected it with LlmError('UNSUPPORTED') — its entire observable
behavior was two throws, each pinned by one adapter test. DeepSeek's
chat-prefix completion is a Beta feature on a base URL neither adapter
targets. ToolSchema.strict was threaded through defineTool, the
registry's schemas() allowlist, the deepseek wire mapping, a per-tool
payload-patching pass in the pi-ai adapter, and a tool-catalog render
row, yet no shipped tool set it and the internal endpoint story for
strict mode was never built.
Remove both fields end-to-end: the vocabulary in dsh-llm, the adapter
guards and wire branches, the dsh-tools threading, the tool-catalog
Strict row, the pinning tests, the core.md pastes, the adapter README
rows, and the cookbook line that used prefill as the UNSUPPORTED
example (now stated generically). The pi-ai payload fixup keeps the
half with a job: pi-ai stamps strict:false on every serialized tool,
so the fixup scrubs it unconditionally for wire parity with the
hand-rolled twin (per-tool set/delete machinery gone). temperature/
stop/maxTokens are untouched — honored end-to-end by both adapters.
Each knob returns with its first real producer: prefill with an
adapter that implements chat-prefix completion, strict with a tool
that wants it and a beta-endpoint story.
RFC: docs/rfc/implemented/simplification/2026-07-04-drop-inert-request-knobs.md
(moved from proposed/, amended to shipped reality); the content-block
vocabulary RFC's consequence line now records prefill as producer-gated.
Master's docs-overhaul stack (#142-#144) rewrote AGENTS.md into the
slim budget-gated form and repointed the review skill's citations.
Resolutions:
- AGENTS.md: master's rewrite wins; the no-hardcoded-tunables
convention is re-added as one terse bullet in the new style, after
'Explicit > implicit at package seams'. Within the verify-doc-budgets
ceiling, so no displacement or raise needed.
- dsh-code-review SKILL.md: master's repointed citations win; the
hardcoded-tunables reviewer check and the Conventions keyword are
re-applied on top.
- packages/README.md: master replaced the hand-maintained dependency
list (which carried this branch's chars-per-token wording) with a
pointer to the generated module graph — master's side taken whole;
the estimator wording lives on in the compact package READMEs.
dsh-llm owns the vocabulary (attribution.ts): AppIdentity with the version
read from the package manifest, userAgent(), and attributionHeaders(target,
identity) over a closed AttributionTarget union ('generic' | 'openrouter').
Both adapters send the headers on every provider request — llm-deepseek in
its fetch headers, llm-pi-ai through pi-ai's StreamOptions.headers — behind
an explicit attributionTarget config (never inferred from baseURL), with
mock-server tests asserting exact wire arrival and the absence of the
OpenRouter set by default.
The RFC moves to implemented/ amended with the settled identity (the
deepseek-harness token, the DeepSeek Harness title, the planned
deepseek-ai/deepseek-harness-sdk URL behind a FIXME until that repo exists)
and the explicit-config OpenRouter decision.
The vocabulary maps grow by declaration merging, and the admission policy
stated on TurnEndReasonMap is that a variant lands with its first emitter.
Three declared items had no producer and no consumer:
- CacheHint and the cache?: CacheHint fields on TextBlock/ToolResultBlock:
nothing constructs a block with cache:, and neither adapter reads .cache —
DeepSeek prompt caching is automatic (hints map OUT of responses, never IN).
- MessageSourceMap.agent: zero constructors; the subagent backends send the
parent prompt with no source (logs as user), and the envelope renderer
interpolates source.kind without routing on it.
- TurnTriggerMap.continuation: the loop structurally cannot emit it —
continuation is further steps within a turn, never a new turn — and its only
writer was an llm-replay test fixture that needed any non-message trigger
(now an injection trigger).
Each variant returns the day it gains a real producer, via the same
merge-extensible maps. Docs updated in the same change: the MessageSourceMap
paste in core.md, the TurnTriggerMap paste in session.md (manifest untouched —
both symbols survive), the content-block vocabulary RFC's cache-hints
consequence line, and the RFC moved to implemented/ and amended to shipped
reality (the image block's own cache field had already left with the
drop-image RFC).
The audit swept every packages/*/* plugin for the new AGENTS.md
convention (no hardcoded tunables in plugins) and exposes each finding
as a defaulted, validated Config field. Defaults are the previously
hardcoded values throughout, so no deployment or golden changes.
- tool-fs (had NO Config): readLimit, readMaxLineLength, readMaxBytes,
readStreamMinSize. The caps thread through ReadToolCaps/ReadWindow —
read-render already documented that the consumer applies the caps, so
they become explicit per-request fields.
- tool-web: searchMaxResults (WEB_SEARCH_MAX_RESULTS stays as the
schemastery default). Also fixes the stale GREP_LIMIT references in
search.ts and the web-capability-seam RFC (no such constant exists).
- bash-local: graceMs (SIGTERM->SIGKILL escalation grace). The
RunInternals.graceMs test seam is gone: graceMs is now a required
SpawnSpec field filled from config, so tests exercise the real
config path and the defaults live in exactly one place.
- subagent-acp: disposeEofGraceMs / disposeGraceMs. The AcpRunSpec
fields become required for the same one-defaulting-layer reason.
- session-persistence-sqlite: journalMode ('wal' default; the
rollback-journal modes serve filesystems where WAL's shared-memory
files do not work, e.g. network mounts).
- hooks-claude + hooks-codex: stderrSummaryMaxChars for the persisted
hook/result stderr summary. The duplicated summarize() helpers merge
into hook-protocol's summarizeStderr(stderr, maxChars), beside the
HookResultRecord field it feeds, with the bound parameterized the
same way runHook's defaultTimeoutMs already is.
- compact-basic: charsPerToken for the token estimator (default 4, the
English-text heuristic; CJK-heavy deployments need ~1-2 or compaction
fires far too late). Also corrects the BasicCompactService class doc,
which claimed defaults the required-field config never had.
- fs-local: deletes the dead STREAM_MIN_SIZE constant and the dead
FsIoInternals.streamMinSize seam — the read-routing bound lives in
the consumer (tool-fs), where it is now config. This is item 1 of
the proposed prune-write-only-fs-surface RFC, annotated accordingly.
Every new field gets range validation (following the existing
assertPositiveFinite pattern), a README row, and tests covering the
configured behavior, the schema default, and load-time rejection.
ImageBlock had no production producer and every consumer dropped it:
the deepseek serializer skipped it, the pi-ai converter skipped it as
unrepresentable, the ACP bridge neither advertises image prompt
capability nor forwards image blocks, and compact-basic charged a flat
85-token estimate and rendered an [image] placeholder. A block
constructed today would silently vanish from the wire — the vocabulary
advertised a capability no path honors, the silent-data-loss shape the
defensive patterns warn against. The only constructors were tests
pinning the skip/estimate branches.
Remove ImageBlock and its ContentBlockMap entry (its cache?: CacheHint
field leaves with it; CacheHint itself and the other two cache? fields
are out of scope). compact-basic loses its explicit image estimate and
placeholder arms (the merge-extensible default arms absorb the case);
the deepseek serializer, pi-ai converter, and ACP codec already handled
image in their default arms, so only their image-naming comments
change. The codec's inbound rejection of ACP-protocol image prompt
content stays — that guards wire content a client can send regardless
of our vocabulary.
Tests that constructed harness image blocks to pin the removed branches
are dropped (the 85-token estimate pin) or retargeted onto plugin-added
block types / other non-text blocks, which the surviving default arms
own. Docs, the type-equiv pastes, and the content-block vocabulary
RFC's block list and multimodal-home consequence are updated in the
same change; the RFC moves to implemented/ and the index is
regenerated. A real multimodal feature reintroduces image via
declaration merging together with the adapter mapping, ACP
advertisement, and compaction pricing that honor it.
- session.md § TurnEndReasonMap now carries the full precedence rule
the old architecture.md stated and the loop implements (loop.ts's
stepFinishReason carry-forward): max-tokens wins over completed only;
disposed/aborted/error take precedence. The architecture.md pointer
was otherwise citing an incomplete home.
- The cookbook feature-map compaction row no longer reads as if a
model-facing /compact tool ships: a manual trigger invokes the same
ctx.compact routine; the consumer tool is deferred per the
compaction RFC.
WebService exposed an observation surface nothing in production observes:
the web/providers-change event (declared, emitted on every provider
registration/disposal, rollback-yield ordered before the emit solely so a
throwing change listener unwinds the registration) and the aggregated
searchStatus()/fetchStatus() query with its WebCapabilityStatus union.
dsh-tool-web executes through ctx.web.search()/fetch() and routes on the
structured WebError codes selection throws at execution time; tool
registration follows product enablement, not provider availability. The
only listeners/callers were the web packages' own tests, and the
tool-web README / architecture.md prose claiming the tool 'reads only the
aggregated searchStatus()/fetchStatus()' had drifted from the call sites.
Remove the event declaration, both emits, and the rollback-before-emit
machinery (the plain ctx.effect disposer keeps HMR cleanup, matching
LlmService.registerAdapter). Remove searchStatus()/fetchStatus(),
resolveStatus(), and WebCapabilityStatus; the provider-private status()
stays as the execution-time selection input. Delete the listener-throw
rollback test, and rewrite every event/status assertion across the web
packages' tests onto caller-observable behavior: a successful
search()/fetch() or the structured WEB_PROVIDER_* codes. Regenerate the
cordis catalog; update the web/tool-web READMEs, the architecture.md web
paragraph, core-data-structures/web.md, and the type-equiv manifest; amend
the web capability seam RFC's facts to the shipped surface. This follows
the llm/adapter-change precedent: a boot-time backend-registry signal and
an availability probe distinct from executing both sit on the cut side of
its keep/cut criterion.
RFC: docs/rfc/implemented/simplification/2026-07-04-drop-unconsumed-web-observation-surface.md
The fs seam split left four pieces of pre-split surface populated on
every call and read by nobody:
- STREAM_MIN_SIZE + FsIoInternals.streamMinSize in dsh-fs-local: the
backend has no read routing (readWholeText/streamWholeText are
separate primitives the caller picks), and the real 10 MiB routing
constant lives in dsh-tool-fs's read tool. Delete the dead mirror and
the knob whose JSDoc claimed an override that did not exist; the
remaining FsIoInternals knobs stay (the atomic-write tests use them).
- FsTarget.inputPath: a "diagnostics only" field every backend and test
fake had to fabricate, with zero production readers (policy and error
messages use targetKey/displayPath). listDir gave children the bare
entry name, which was nobody's input.
- FsEditOutcome.replacements/.replaceAll: replacements had no reader
(the single-match policy is enforced by the FS_AMBIGUOUS_EDIT /
FS_EDIT_NOT_FOUND throws, whose message keeps the internal count);
replaceAll only echoed the replace_all argument back to
formatEditOutput, which now takes it from the parsed args. The
outcome shrinks to { version, before, after }, parallel to
FsWriteOutcome's backend-discovered fields. Emitted text is unchanged
for both branches (no snapshot churn).
- FileReadOutcome.limit/.version: formatReadOutput renders
offset/lines/totalLines/truncatedByBytes only, and the fs/observed
emit uses info.version directly.
Backends shed four fabrication obligations and gain none. Doc pastes
(core-data-structures/filesystem.md), the dsh-fs README resolve row,
and the test fakes shrink with the types. RFC moved to
implemented/simplification and amended to the shipped shape
(FsEditSpec -> FsEditRequest name fix; manifest rows needed no change).
Codex review of the vocabulary relocation found two doc-accuracy issues:
- presentation.ts's JSDoc used {@link ToolDefinition...}, which the
TypeScript language service cannot resolve because presentation.ts
deliberately does not import index.ts (that would create the cycle the
split avoids). Demote those three to plain `ToolDefinition` code text;
same-file and imported @links (TerminalResultView, ContentBlock) stay.
- docs/core-data-structures/tools.md's source header listed only index.ts
and schema.ts; add presentation.ts, which now owns the presentation
vocabulary the page documents.
The tool render-intent vocabulary (ToolCallView/ToolResultView + members,
FileLocation, FileDiff, ToolCallKind) is the UI-facing surface of
dsh-tools; it lived inline in index.ts alongside the registry and
execution core. Move it to its own presentation.ts module so index.ts is
the registry + execute waterfall and the presentation vocabulary is a
separate, one-directional dependency.
presentation.ts owns ONLY render-intent types and references none of the
execution types; index.ts imports the view types for ToolDefinition's
presentCall/presentResult signatures (clean acyclic index -> presentation).
The opaque `meta` presentation channel (ToolExecuteReturn, ToolResult,
ToolExecutionResult) is execution plumbing and stays in index.ts.
Public surface unchanged: index.ts re-exports the vocabulary, so consumers
(tool-fs/tool-bash/tool-web/tool-todo, the ACP bridge) keep importing from
@deepseek-ai/dsh-tools with zero churn. No producer/bridge/test edits; a
pure internal relocation with no observable-output change (snapshot goldens
untouched).
The write-diff-card fix made write's presentResult return an args-derived
whole-file diff (oldText:null) for a create / unchanged overwrite, but the
DiffResultView contract and its mirrored docs still said `diffs` is ALWAYS
the applied contextual hunks computed from before/after. Correct the type
JSDoc, the write execute-side comment, and the four mirrored surfaces
(tools.md, tools README, acp-feature-support, adding-a-tool cookbook) to
say: typically the applied hunks, or a whole-file diff when there is no
before-image (a create) — and that a mutation returns the diff result even
when it duplicates the call-time card, since a tool_call_update.content
replace would otherwise clobber the diff with the model-facing text.
Regenerate the cordis catalog (source line shift).
The pasted type-equiv block's JSDoc still said the meta payload is
`{@link JsonValue}`; the source comment is `unknown` (the meta channel is
opaque at the seam). verify-type-equiv compares type structure, not the
comment, so the drift slipped through — align the doc comment.
Address the applied-hunk-diffs review:
- CRLF write overwrite emitted bogus every-line-changed hunks: write's
`before` was LF-normalized but `after` kept the raw model content, so a
CRLF rewrite of an LF file diffed every line. Normalize write's `after`
to LF so both sides share the diff basis (edit already did). Regression
test proves it fails on the raw-after path.
- The tool-private `meta` payload is now typed `unknown` (opaque) at every
seam instead of `JsonValue`. This drops the `dsh-tools -> dsh-session`
package edge that existed only to name the type, and removes the
`FileDiff` index signature that had been widening the type solely for
JsonValue-assignability. Serializability is still enforced at runtime by
`Session.append`'s isJsonValue check, which was always the real guard.
- Sync the docs the new result/meta surface left stale: ToolResultView's
diff card + ToolExecutionResult.meta in tools.md/session.md type-equiv
blocks, the acp/tools READMEs, and the adding-a-tool cookbook; regenerate
the cordis catalog and module graph.
fs write/edit now emit a result-time contextual-diff tool_call_update
(the applied hunk with ±3 context lines, one hunk per replace_all site),
matching what claude-agent-acp sends and what makes an editor render the
change in place. The call-time snippet diff stays; the result hunk
supersedes it (ACP content-replace).
Mechanism:
- A persisted tool-private `meta` channel: execute may return
`{ content, meta }`; `meta` (JsonValue) rides on the tool/result event
and is handed back to presentResult, so the diff reproduces on replay
(event-sourced). JsonValue is now exported from dsh-session.
- The backend returns raw before/after text (storage facts) on
FsWriteOutcome/FsEditOutcome; the tool computes the hunk via the npm
`diff` package's structuredPatch. A create has no before → no result
diff; a failed/aborted mutation carries no meta.
- ToolResultView gains a DiffResultView; the bridge's result-side switch
renders it as {type:'diff'} content blocks.
RFC: docs/rfc/implemented/architecture/2026-07-02-result-time-applied-hunk-diffs.md
(justifies the npm `diff` runtime dep over vendoring and the meta channel);
the render-intent-union RFC's Non-goal is updated to record this shipped.
All fs snapshot goldens re-recorded; edit/overwrite gain the contextual
result diff, create/read/policy-reject unchanged in structure.
The closed WebErrorCode union leaked fetch-transport details (redirect,
too-large, content-type) into the seam's shared vocabulary and made web
the only seam with a closed error-code union. Drop it and let WebError
carry an open code: string like LlmError/SubagentError; document the
codes grouped by owner (seam-neutral vs dsh-web-fetch-local transport).
Addresses tianyicui's leaky-abstraction review comment on WebErrorCode.
Replace the "bag of optional fields" tool-presentation types
(ToolCallPresentation / ToolResultPresentation / ToolTerminal) with a
card-tagged discriminated union — the standing FIXME(tool-presentation).
A tool declares one render intent per call/result and the ACP bridge
switches on `card`:
ToolCallView = generic | terminal | diff
ToolResultView = generic | terminal
The `diff` card is new: fs write/edit now emit an ACP {type:'diff'}
content block (an editor's inline diff), which the old shapes could not
express. The bridge also relativizes a file card's title against the
session cwd (mirroring claude-agent-acp's toDisplayPath) while keeping
locations/diff paths raw, and derives the no-capability fenced console
fallback from a terminal result's output. read gains the window-in-title
(`Read foo.txt (5 - 8)`) and an always-set location line, matching the
reference adapter field-for-field.
Migrates all three producer families (tool-fs, tool-bash, tool-todo) and
the sole consumer (the ACP bridge) together — the source does not compile
piecewise. Adds snapshot coverage for the terminal _meta path (a new
capability-advertising scenario) and re-records the fs goldens to show the
diff cards. Applied-hunk (result-time, context-line) diffs need a new
result/event shape and are a follow-up.
RFC: docs/rfc/implemented/architecture/2026-07-02-tool-render-intent-union.md
Tianyi Cui
Dudu-0223
Yichen Jiang