[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

Codecov Report

❌ 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 repeatedly fails, with errors reported appropriately.
- 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, waits for API-history saving, retries failures, 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, event 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: 🟡 Moderate · up to c06e3

This change makes TaskCompleted wait for persisted completion history, but overlapping late saves or retries could still associate a completion with the wrong task turn and expose stale or missing restart history; the delegated-child cancellation path also lacks a focused regression check. Merge should wait for generation-scoped persistence and cancellation handling, or obtain explicit owner acceptance of this bounded risk.

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

Caution

Pre-merge checks failed

Please resolve all errors before merging. Addressing warnings is optional.

Ignore

❌ Failed checks (1 error, 2 warnings)

Check name	Status	Explanation	Resolution
Trust And Persistence Invariants	❌ Error	The new cancellation path leaves a persistence retry running after task disposal. `waitForCurrentAssistantMessagePersistence()` starts `retrySaveApiConversationHistory()` and races it against cancella…	Make persistence retries cancellation-aware. Track or pass an abort signal to each retry delay, clear pending timeout handles from `cancelAssistantMessagePersistence()` and `dispose()`, and check cancellation before every retry and write. E…
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 PR lacks focused coverage for recovery after an initial assistant-history write failure. `Task.waitForCurrentAssistantMessagePersistence()` enters the retry path after `addToApiConversationHistory…	Add a focused `Task.persistence.spec.ts` case that makes the initial assistant save fail, makes the first bounded retry succeed, invokes the accepted completion flow, and asserts that the retry completes before `TaskCompleted` emits. Add an…

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the primary fix: preventing task history from becoming unavailable after completion and restart.
Description check	✅ Passed	The description explains the implementation, rationale, impact, linked issue, and test coverage. It does not reproduce every template section, but it contains the critical information needed for revie…
Linked Issues check	✅ Passed	The changes address issue `#1453`. They add deterministic persistence-order tests, define completion semantics, wait for restart-visible history, cover delayed and failed writes, preserve successful com…
Out of Scope Changes check	✅ Passed	The Alloy model, documentation, unit tests, API history-sequence helper, end-to-end assertions, and persistence changes all support the linked completion-persistence issue. No unrelated UI or feature …

Full details: Description check

Explanation

The description explains the implementation, rationale, impact, linked issue, and test coverage. It does not reproduce every template section, but it contains the critical information needed for review.

Full details: Linked Issues check

Explanation

The changes address issue #1453. They add deterministic persistence-order tests, define completion semantics, wait for restart-visible history, cover delayed and failed writes, preserve successful completion, and verify fresh-host restoration end to end.

Full details: Out of Scope Changes check

Explanation

The Alloy model, documentation, unit tests, API history-sequence helper, end-to-end assertions, and persistence changes all support the linked completion-persistence issue. No unrelated UI or feature changes are evident.

Full details: Regression Evidence

Explanation

The PR lacks focused coverage for recovery after an initial assistant-history write failure. Task.waitForCurrentAssistantMessagePersistence() enters the retry path after addToApiConversationHistory() resolves failed (src/core/task/Task.ts:1023-1072). The tests cover an initially delayed save that later succeeds and a save that exhausts all retries, but the only successful retry test calls retrySaveApiConversationHistory() directly. No test proves that a failed initial assistant save, followed by a successful retry, allows TaskCompleted to emit. The delegated cancellation branch is also untested: AttemptCompletionTool.ts:146-147 returns before delegation when persistence resolves false; the cancellation test covers only standalone completion, while the delegation tests cover a pending true and a rejected promise. No UI changed, so a Playwright snapshot is not required.

Resolution

Add a focused Task.persistence.spec.ts case that makes the initial assistant save fail, makes the first bounded retry succeed, invokes the accepted completion flow, and asserts that the retry completes before TaskCompleted emits. Add an attemptCompletionTool.spec.ts delegated-child case where persistence resolves false, then assert that neither parent reopening nor TaskCompleted occurs.

Full details: Trust And Persistence Invariants

Explanation

The new cancellation path leaves a persistence retry running after task disposal. waitForCurrentAssistantMessagePersistence() starts retrySaveApiConversationHistory() and races it against cancellation (src/core/task/Task.ts:1064-1067). When dispose() calls cancelAssistantMessagePersistence() (src/core/task/Task.ts:2581-2584), the wait returns false, but the abandoned retry still owns timers and later calls saveApiConversationHistory() through the three delayed attempts (src/core/task/Task.ts:1186-1195). If an assistant write fails and the task is cancelled or replaced during retry, the disposed task remains retained and can perform post-disposal writes, including a stale write against a task that a fresh instance has resumed. This is a changed lifecycle-resource leak and a persistence race.

Resolution

Make persistence retries cancellation-aware. Track or pass an abort signal to each retry delay, clear pending timeout handles from cancelAssistantMessagePersistence() and dispose(), and check cancellation before every retry and write. Ensure the retry promise settles without performing any save after task disposal or generation reset.

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src/__tests__/history-resume-delegation.spec.ts

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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
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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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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.

Time taken: 11m 22s

coderabbitai · 2026-08-31T23:47:49Z

✅ Action performed

Review finished.

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

test(formal): model completion persistence ordering

ffa64eb

zoomote Bot mentioned this pull request Aug 30, 2026

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

Open

6 tasks

test(task): reproduce completion persistence race

68fb953

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

coderabbitai Bot previously approved these changes Aug 30, 2026

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fix(task): persist history before completion

e3a191d

zoomote Bot dismissed coderabbitai[bot]’s stale review via e3a191d August 30, 2026 18:28

test(e2e): require restored completion turn

096c469

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

coderabbitai Bot requested changes 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

github-actions Bot added the awaiting-author PR is waiting for the author to address requested changes label Aug 30, 2026

test(api): strengthen completion persistence checks

b0abbfd

github-actions Bot removed the awaiting-author PR is waiting for the author to address requested changes label Aug 31, 2026

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

edelauna requested review from JamesRobert20, edelauna, hannesrudolph, navedmerchant and taltas as code owners August 31, 2026 20:47

github-actions Bot added the awaiting-maintainer CodeRabbit approved; waiting for a human maintainer label Aug 31, 2026

fix(task): cancel pending persistence waits

c06e3a5

github-actions Bot removed the awaiting-maintainer CodeRabbit approved; waiting for a human maintainer label Aug 31, 2026

github-actions Bot added the awaiting-maintainer CodeRabbit approved; waiting for a human maintainer label Aug 31, 2026

coderabbitai Bot requested changes Aug 31, 2026

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

github-actions Bot added awaiting-author PR is waiting for the author to address requested changes and removed awaiting-maintainer CodeRabbit approved; waiting for a human maintainer labels Aug 31, 2026

fix(task): stop persistence retries on cancel

1d01b18

github-actions Bot added awaiting-maintainer CodeRabbit approved; waiting for a human maintainer and removed awaiting-author PR is waiting for the author to address requested changes labels Aug 31, 2026

test(task): cover completion retry recovery

d487ad4

github-actions Bot added awaiting-maintainer CodeRabbit approved; waiting for a human maintainer and removed awaiting-maintainer CodeRabbit approved; waiting for a human maintainer labels Aug 31, 2026

coderabbitai Bot previously approved these changes Aug 31, 2026

View reviewed changes

fix: apply CodeRabbit auto-fixes

0a58aa9

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

coderabbitai Bot dismissed their stale review via 0a58aa9 August 31, 2026 23:59

github-actions Bot added awaiting-maintainer CodeRabbit approved; waiting for a human maintainer and removed awaiting-maintainer CodeRabbit approved; waiting for a human maintainer labels Sep 1, 2026

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

28d26a2

github-actions Bot added awaiting-maintainer CodeRabbit approved; waiting for a human maintainer and removed awaiting-maintainer CodeRabbit approved; waiting for a human maintainer labels Sep 1, 2026

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