[Fix] Task history can disappear when users restart after completion by zoomote[bot] · Pull Request #1452 · Zoo-Code-Org/Zoo-Code

zoomote · 2026-08-30T14:18:56Z

What changed

TaskCompleted now waits until the accepted assistant completion turn is persisted and visible to a fresh extension host. Delayed writes keep completion pending, failed writes use the existing bounded retry policy and suppress the completion event if retries are exhausted, and delegated subtasks persist their completion turn before the child is closed and the parent is reopened.

Cancellation, disposal, and stream-generation resets settle pending waiters and cancel generation-local retry delays without task-wide timer state. An explicit cancellation guard at the post-delay, pre-save boundary prevents a stale persistence attempt if cancellation wins after backoff resolves. Deterministic coverage exercises that exact boundary, alongside delayed, successful, failed, delegated, and recovery paths.

The PR retains the Alloy 6 safety model and the two-process restart-persistence scenario. The fresh extension host verifies that the marked user turn is followed by its marked attempt_completion assistant turn without exposing conversation contents through the test API.

Why this change was made

CodeRabbit's linked-issue check identified that the original characterization did not satisfy issue #1453's production acceptance criteria. Consumers could observe TaskCompleted, restart the extension host, and find that the matching API conversation history was not yet available. The final cleanup keeps retry-timer ownership scoped to each persistence generation while preserving cancellation safety.

Impact

Consumers can treat TaskCompleted as the restart-safe boundary for the accepted completion turn. An indefinitely delayed write intentionally delays completion rather than weakening that contract, while exhausted retries surface through the existing completion error path without emitting a false success event. Cancellation performs no later retry save or completion side effect. There is no UI change.

Linked work items

Closes #1453

github-actions · 2026-08-30T14:19:07Z

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codecov · 2026-08-30T14:20:16Z

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❌ Patch coverage is 88.88889% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/core/task/Task.ts	86.79%	2 Missing and 5 partials ⚠️
src/extension/api.ts	90.00%	0 Missing and 1 partial ⚠️

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edelauna · 2026-08-30T17:20:12Z

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📝 Walkthrough

Summary by CodeRabbit

New Features
- Added an API method to verify ordered user messages and assistant tool calls in persisted task history.
Bug Fixes
- Task completion events are now emitted only after conversation history is successfully persisted.
- Completion is prevented when persistence fails or is cancelled.
- Improved reliability for delegated, resumed, and restart-related task completion flows.
Documentation
- Added documentation covering completion persistence policies, verification steps, expected results, and known limitations.

Walkthrough

Adds assistant-history persistence tracking and gates TaskCompleted emission on successful persistence. Adds deterministic regression tests, restart-history verification, Alloy lifecycle checks, and completion-contract documentation.

Changes

Completion persistence

Layer / File(s)	Summary
Lifecycle contract and bounded checks `.github/alloy/CompletionPersistence.als`, `.github/alloy/README.md`	Defines completion policies, history durability, lifecycle transitions, bounded assertions, and Alloy verification steps.
Assistant history persistence state `src/core/task/Task.ts`, `src/core/task/__tests__/Task.persistence.spec.ts`	Tracks assistant-message persistence per request, retries failed saves, handles cancellation, and validates persistence outcomes.
Completion event gating and validation `src/core/tools/AttemptCompletionTool.ts`, `src/core/tools/__tests__/attemptCompletionTool.spec.ts`, `src/__tests__/history-resume-delegation.spec.ts`, `src/__tests__/nested-delegation-resume.spec.ts`	Waits for assistant-history persistence before delegated and accepted completion events. Tests delayed persistence, ordering, failure handling, cancellation, and resumed-task stubs.
Restart history verification `packages/types/src/api.ts`, `src/extension/api.ts`, `src/extension/__tests__/api-task-conversation-history-length.spec.ts`, `apps/vscode-e2e/src/suite/restart-persistence.test.ts`, `packages/types/src/events.ts`	Adds ordered persisted-history verification, tests matching and non-matching sequences, strengthens restart assertions, and documents `TaskStarted` timing.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: 🔵 Low · up to 8aff8

Task completion now waits for the matching history entry to be persisted before notifying consumers, reducing restart-related data loss. A bounded concurrency risk remains where overlapping requests could produce a false persistence signal, and exhausted retries may still surface through an unrelated error path; the PR is mergeable with explicit owner follow-up.

Sequence Diagram(s)

sequenceDiagram
  participant AttemptCompletionTool
  participant Task
  participant APIHistory
  participant ExtensionHost
  AttemptCompletionTool->>Task: waitForCurrentAssistantMessagePersistence
  Task->>APIHistory: persist assistant conversation history
  APIHistory-->>Task: return persistence result
  Task-->>AttemptCompletionTool: resolve or report failure
  AttemptCompletionTool->>ExtensionHost: emit TaskCompleted

Suggested reviewers: edelauna

🚥 Pre-merge checks | ✅ 5 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 11 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Regression Evidence	⚠️ Warning	The new `API.hasTaskApiConversationHistorySequence` behavior lacks one focused negative case. The implementation explicitly returns `false` when `findIndex` cannot find the requested user turn (`src/e…	Add a unit test in `src/extension/__tests__/api-task-conversation-history-length.spec.ts` where `mockGetTaskWithId` resolves with an empty history or unrelated user history. Call `hasTaskApiConversationHistorySequence` with the expected mar…

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the primary fix: preserving task history across restart after completion.
Description check	✅ Passed	The description explains the implementation, behavior, impact, linked issue, and test coverage. It does not reproduce every template section, such as the checklist and explicit test procedure, but it …
Linked Issues check	✅ Passed	The changes address issue `#1453` by gating TaskCompleted on persistence, defining delayed and failed-write behavior, preserving successful completion, adding deterministic regression coverage, and veri…
Out of Scope Changes check	✅ Passed	The Alloy model, documentation, unit tests, API history-sequence check, event documentation, delegation updates, and restart-persistence E2E changes all support the linked issue objectives. No unrelat…
Trust And Persistence Invariants	✅ Passed	No explicit trust or persistence failure is introduced by the changed paths. Completion persistence awaits `saveApiConversationHistory()` and the bounded retry path before emitting `TaskCompleted`; ca…

Full details: Description check

Explanation

The description explains the implementation, behavior, impact, linked issue, and test coverage. It does not reproduce every template section, such as the checklist and explicit test procedure, but it is sufficiently complete and relevant.

Full details: Linked Issues check

Explanation

The changes address issue #1453 by gating TaskCompleted on persistence, defining delayed and failed-write behavior, preserving successful completion, adding deterministic regression coverage, and verifying fresh-host restart visibility.

Full details: Out of Scope Changes check

Explanation

The Alloy model, documentation, unit tests, API history-sequence check, event documentation, delegation updates, and restart-persistence E2E changes all support the linked issue objectives. No unrelated code changes are evident.

Full details: Regression Evidence

Explanation

The new API.hasTaskApiConversationHistorySequence behavior lacks one focused negative case. The implementation explicitly returns false when findIndex cannot find the requested user turn (src/extension/api.ts:262-268). The added tests cover a matching sequence, a task lookup rejection, and a mismatched assistant after an existing user turn (src/extension/__tests__/api-task-conversation-history-length.spec.ts:46-105), but none cover a successfully loaded task whose history has no matching user turn. This is a plausible restored-history failure and is the method's direct unset/negative branch.

Resolution

Add a unit test in src/extension/__tests__/api-task-conversation-history-length.spec.ts where mockGetTaskWithId resolves with an empty history or unrelated user history. Call hasTaskApiConversationHistorySequence with the expected markers and assert that it resolves to false.

Full details: Trust And Persistence Invariants

Explanation

No explicit trust or persistence failure is introduced by the changed paths. Completion persistence awaits saveApiConversationHistory() and the bounded retry path before emitting TaskCompleted; cancellation settles the waiter and cancels retry delays. API-history writes use the existing locked temporary-file-and-rename safeWriteJson path. The new history-sequence API returns only a boolean and catches unavailable-task errors. Completion delegation still requires askFinishSubTaskApproval().

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zoomote · 2026-08-30T18:06:06Z

Addressed the CodeRabbit auto-fix cleanup in 28d26a2ba: retry timers are generation-local again, the explicit post-delay/pre-save cancellation guard remains, and the redundant backoff test now deterministically cancels at that boundary. Generic generated docstrings were removed while the useful persistence and lifecycle documentation was retained.

Focused tests pass 60/60, the full repository suite passes 7,916 tests with 39 skipped, and full lint and typecheck pass. The visual-proof handoff timed out; no browser evidence is required because this change has no UI surface. No unresolved CodeRabbit inline threads remain.

edelauna · 2026-08-30T18:48:26Z

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Inline comments:
In `@apps/vscode-e2e/src/suite/restart-persistence.test.ts`:
- Around line 84-85: Strengthen the persistence assertion near
conversationLength by validating that the fresh host restored both the expected
user turn and the accepted assistant completion turn, including their roles or
content. Do not rely on conversationLength >= 2 alone; use the existing
conversation entries or a helper with a contract that verifies those exact
turns.

In `@src/core/task/__tests__/Task.persistence.spec.ts`:
- Line 475: In the unresolved-save test around mockSaveApiMessages, add an
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and before saveDeferred is resolved. Preserve the existing assertion that the
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edelauna · 2026-08-31T03:11:55Z

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In `@src/core/tools/__tests__/attemptCompletionTool.spec.ts`:
- Around line 848-874: The cancellation test should cover delegated child tasks
by setting parentTaskId and making waitForCurrentAssistantMessagePersistence
resolve false. Assert askFinishSubTaskApproval, reopenParentFromDelegation, and
TaskCompleted are not called, verifying the early-return path in
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Outside diff comments:
In `@src/core/tools/AttemptCompletionTool.ts`:
- Line 218: Update the accepted-completion flow around emitPublicTaskCompleted
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src/core/tools/AttemptCompletionTool.ts
src/core/task/__tests__/Task.persistence.spec.ts
src/__tests__/history-resume-delegation.spec.ts
src/__tests__/nested-delegation-resume.spec.ts
src/core/task/Task.ts
src/core/tools/__tests__/attemptCompletionTool.spec.ts

Act as an adversarial second-opinion reviewer. Verify PR claims against implementation, contracts, and tests. Trace changed inputs through normal, boundary, error, cancellation, retry, and default paths and their consumers. Seek plausible c...

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Files:

src/core/tools/AttemptCompletionTool.ts
src/core/task/__tests__/Task.persistence.spec.ts
src/__tests__/history-resume-delegation.spec.ts
src/__tests__/nested-delegation-resume.spec.ts
src/core/task/Task.ts
src/core/tools/__tests__/attemptCompletionTool.spec.ts

Add focused tests for UI binding and save behavior, persistence or normalization, and the value returned by `getStateToPostToWebview()`, including true and false/unset cases when defaults could hide omissions.

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Files:

src/core/task/__tests__/Task.persistence.spec.ts
src/__tests__/history-resume-delegation.spec.ts
src/__tests__/nested-delegation-resume.spec.ts
src/core/tools/__tests__/attemptCompletionTool.spec.ts

Fix lint violations in new TypeScript code instead of suppressing them.

📄 CodeRabbit inference engine (AGENTS.md)

Files:

src/core/tools/AttemptCompletionTool.ts
src/core/task/__tests__/Task.persistence.spec.ts
src/__tests__/history-resume-delegation.spec.ts
src/__tests__/nested-delegation-resume.spec.ts
src/core/task/Task.ts
src/core/tools/__tests__/attemptCompletionTool.spec.ts

After editing a file, run ESLint with pruning and zero warnings for that relative file, and confirm its suppression count did not increase.

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Files:

src/core/tools/AttemptCompletionTool.ts
src/core/task/__tests__/Task.persistence.spec.ts
src/__tests__/history-resume-delegation.spec.ts
src/__tests__/nested-delegation-resume.spec.ts
src/core/task/Task.ts
src/core/tools/__tests__/attemptCompletionTool.spec.ts

edelauna · 2026-08-31T23:46:59Z

@CodeRabbit review

coderabbitai · 2026-08-31T23:47:30Z

Fixes Applied Successfully

Fixed 3 file(s) based on 3 failed pre-merge checks.

Files modified:

src/core/task/Task.ts
src/core/task/__tests__/Task.persistence.spec.ts
src/core/tools/AttemptCompletionTool.ts

Commit: 0a58aa916943c20188b84594ea7a4be2533d0eae

The changes have been pushed to the fix/model-completion-persistence-176wyz2fscjpe branch.

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coderabbitai · 2026-08-31T23:47:49Z

✅ Action performed

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Fixed 3 file(s) based on 3 failed pre-merge checks. Co-authored-by: CodeRabbit <noreply@coderabbit.ai>

edelauna · 2026-09-02T00:40:09Z

@CodeRabbit review

coderabbitai · 2026-09-02T00:40:16Z

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test(formal): model completion persistence ordering

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zoomote Bot mentioned this pull request Aug 30, 2026

[BUG] TaskCompleted can precede restart-visible API history #1453

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test(task): reproduce completion persistence race

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zoomote Bot changed the title ~~[Chore] Model completion persistence ordering with Alloy~~ [Chore] Model and reproduce completion persistence ordering Aug 30, 2026

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fix(task): persist history before completion

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test(e2e): require restored completion turn

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zoomote Bot changed the title ~~[Chore] Model and reproduce completion persistence ordering~~ [Fix] Task history can disappear when users restart after completion Aug 30, 2026

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Comment thread apps/vscode-e2e/src/suite/restart-persistence.test.ts Outdated

Comment thread src/core/task/__tests__/Task.persistence.spec.ts

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test(api): strengthen completion persistence checks

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edelauna marked this pull request as ready for review August 31, 2026 20:47

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Comment thread src/core/tools/__tests__/attemptCompletionTool.spec.ts

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fix(task): stop persistence retries on cancel

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test(task): cover completion retry recovery

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fix: apply CodeRabbit auto-fixes

0a58aa9

Fixed 3 file(s) based on 3 failed pre-merge checks. Co-authored-by: CodeRabbit <noreply@coderabbit.ai>

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fix(task): keep persistence retry timers generation-local

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Merge branch 'main' into fix/model-completion-persistence-176wyz2fscjpe

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