feat(cursor): report decoded checkpoint shape so coverage is answerable from logs - #4283
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…le from logs Every checkpoint diagnostic reported bytes, which cannot distinguish a snapshot that contains the suspended tool call from one that merely arrived after it - the exact gap that leaves the native wire-model gate undecidable in #4245. cursorCheckpointShape returns counts only, never content, and the decode is skipped unless provider debug is on.
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Included review availability: Your plan provides up to 10 included reviews per hour; 5 remain after this review. 📝 WalkthroughWalkthroughThe change adds ChangesCursor checkpoint instrumentation
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~12 minutes Change: Feature Merge Risk: 🔵 Low · up to The PR adds bounded debug-only checkpoint diagnostics. Merge risk is low, with a remaining documentation-reference concern that could misdirect future checkpoint investigation. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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| // Byte length says nothing about coverage. `pendingToolCalls` does: it is what | ||
| // distinguishes a snapshot that knows about the suspended call from one that merely | ||
| // arrived after it (#4245). Counts only; the decode is skipped unless debug is on. | ||
| capturedShape: isDebugEnabled() ? cursorCheckpointShape(lastTransport?.captured) : undefined, |
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This changes checkpoint diagnostics within the src/adapters/ area, but its owning document, structure/providers/cursor.md, is unchanged. That leaves the repository’s authoritative Cursor checkpoint description out of sync with the new decoded-shape diagnostic contract; update the owner document in this change to describe the counts-only, debug-gated instrumentation.
AGENTS.md reference: src/AGENTS.md:L10-L11
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In
`@devlog/_plan/260911_cursor_checkpoint_capture/040_wp5_coverage_instrument.md`:
- Line 8: Update the stale source reference for capturedAfterClientTool in the
diagnostic documentation to point to src/adapters/cursor.ts at line 318 instead
of cursor.ts:312, preserving the surrounding explanation.
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devlog/_plan/260911_cursor_checkpoint_capture/000_plan.mddevlog/_plan/260911_cursor_checkpoint_capture/010_phase1_grace_experiment.mddevlog/_plan/260911_cursor_checkpoint_capture/040_wp5_coverage_instrument.mdsrc/adapters/cursor.tssrc/adapters/cursor/checkpoint-store.tstests/providers/cursor/cursor-tool-suspended-checkpoint.test.ts
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| ## Why this could not be settled by reading harder | ||
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| `capturedAfterClientTool` is set from arrival order (`cursor.ts:312`), and |
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📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win
Correct the stale source location.
capturedAfterClientTool is assigned in src/adapters/cursor.ts at Line 318, not cursor.ts:312. Update this reference so the diagnostic evidence remains traceable.
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In `@devlog/_plan/260911_cursor_checkpoint_capture/040_wp5_coverage_instrument.md`
at line 8, Update the stale source reference for capturedAfterClientTool in the
diagnostic documentation to point to src/adapters/cursor.ts at line 318 instead
of cursor.ts:312, preserving the surrounding explanation.
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리뷰 · 우선순위 72 / 80이 PR은 #4281 다음에 오는 Cursor 체크포인트 조사의 진단 도구입니다. 지금 지금까지 진단은
테스트는 라인 수준으로는 큰 결함은 없습니다. 아래는 확인·기록용 포인트입니다. 라인 src/adapters/cursor.ts (capturedShape 배선) - 메인테이너의 판단이 필요한 지점
너의 추천 이 댓글은 grok-bot이 작성했습니다 |
…helper The audit named readPaths, previousWorkspaceUris and the fileStates keys as fields a later extension could leak. Record that in the code rather than only in the review thread.
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Maintainer integration on `dev` per `MAINTAINERS.md` (no second approval required for `dev`). Exact-head CI evidence — head `f529134b8`: 25 SUCCESS, 0 failing, 0 pending. Local evidence at the same tree: `bun run typecheck` clean; `bun test tests/providers/cursor/cursor-tool-suspended-checkpoint.test.ts` 5 pass / 0 fail; `privacy:scan` passed. Reviewer verdict: pass on all four audited items — privacy (counts only, no snapshot strings), safety (fail-closed on malformed bytes, `fromBinary` is the only throwing call), cost (the decode is genuinely skipped when provider debug is off), and correctness of the `pendingToolCalls` claim against the generated schema comment. The reviewer also named `readPaths`, `previousWorkspaceUris` and the `fileStates` keys as fields a later extension could leak; that is now pinned as a constraint in the helper's own doc comment rather than left in the review thread. Security scope: diagnostics only, debug-gated, counts only. No routing, request, or commit behaviour changes. No auth, credential, workflow or release-automation surface. No outstanding maintainer objection. |
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Summary
Follow-up to #4281. Every diagnostic this adapter emits about a checkpoint reports its size in bytes, and a byte count cannot distinguish a snapshot that contains the suspended tool call from one that merely arrived after it.
That distinction is the whole remaining question in #4245.
capturedAfterClientToolis set from arrival order (cursor.ts:312), andconversationCheckpointUpdateis classified liveness-only (live-transport.ts:1221), so arrival is not coverage — which is why #4281 deliberately left the native wire-model gate in place instead of guessing.ConversationStateStructure.pendingToolCallsis documented upstream as "raw JSON stringified tool-call content parts awaiting execution". A non-zero count on a suspended turn is the coverage evidence.What this adds
cursorCheckpointShape(bytes)incheckpoint-store.tsdecodes a snapshot and returns counts only —turns,turnsOld,rootPromptMessages,todos,pendingToolCalls. The strings are request content and are never read. It returnsundefinedon absent, empty, or undecodable input, so a diagnostic can never throw into the request path.Wired into
checkpoint-commit-refusedascapturedShape, guarded byisDebugEnabled()so the decode does not run on a normal request.This converts an open question from "build an instrumented binary and decode bytes by hand" into "read one log line". It is also the general fix for the failure mode that dominated this investigation: four separate conclusions in
devlog/_plan/260911_cursor_checkpoint_capture/rested on an observable that did not mean what it appeared to mean.Verification
bun run typecheck— clean.bun test tests/providers/cursor/cursor-tool-suspended-checkpoint.test.ts— 5 pass, 0 fail. New tests cover a snapshot with a pending call, an equal-shaped one without (which byte length cannot separate), and the fail-closed paths for absent, empty and undecodable bytes.bun run privacy:scan— passed.Scope
Diagnostics only. No routing, request, or commit behaviour changes; the native gate is untouched. Reading
capturedShape.pendingToolCallsoff a live refusal after this ships is what decides whether that gate can move — recorded in040_wp5_coverage_instrument.md, including why the live read was not forced now (it would have required copying a credential store or clobbering a running proxy's pid and admin-token files).Checklist
Refs #4245
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New Features
Bug Fixes
Documentation