fix(task): keep the first abort reason (RSK-19)

[edelauna]

Related GitHub Issue

Closes: #1802

Description

Bug: the chunk-loop catch computes cancelReason while this.abort is false, giving "streaming_failed". It then awaits abortStream. A cancel can land during that await. cancelTask sets abortReason = "user_cancelled" and abort = true. After abortStream returns, the old code wrote this.abortReason = cancelReason, overwriting "user_cancelled" with "streaming_failed". onTaskAborted then saw abortReason === "streaming_failed" and rehydrated. cancelTask also rehydrated. The task rehydrated twice.

Fix in Task.ts: change this.abortReason = cancelReason to this.abortReason ??= "user_cancelled". The ??= keeps the first-set value. A cancel that lands during abortStream no longer overwrites the reason.

Fix in ClineProvider.ts: delete the streaming_failed rehydrate branch from onTaskAborted. After the Task.ts fix, abortReason is never "streaming_failed" when TaskAborted fires. The branch is dead. The deletion also removes a second bug: a non-user abort during the same window previously triggered a spurious rehydrate.

Test Procedure

Tests were written red-first.

Task.abort-reason-race.spec.ts:

1. Mock the stream to throw while this.abort is false.
2. Intercept the abortStream save. Detect it by checking cancelReason === "streaming_failed" in the api_req_started message and !didFinishAbortingStream.
3. At that point, set abort = true and abortReason = "user_cancelled" to simulate the cancel landing.
4. Call recursivelyMakeClineRequests and assert task.abortReason === "user_cancelled".

ClineProvider.taskHistory.spec.ts (added to existing describe):

1. Store a history item for task-abort-1 so getTaskWithId succeeds if the old branch runs.
2. Call the real provider["taskCreationCallback"] on a fake task with abortReason = "streaming_failed".
3. Emit TaskAborted.
4. Assert createTaskWithHistoryItem was not called.

Run pnpm lifecycle:model-check to confirm all lifecycle model checks pass. abortReason is not part of the persisted lifecycle state machine, so no model changes are needed.

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes (if applicable).
• Visual Snapshot (UI changes only): N/A — no UI changes.
• Documentation Impact: No documentation updates required.
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

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📝 Summary

Summary by CodeRabbit

• Bug Fixes
  • User cancellation reasons are preserved when cancellation occurs during stream-error cleanup or retry backoff, rather than being overwritten by another abort reason.
  • Tasks aborted after a streaming failure are no longer automatically restored. The abort event is forwarded once, preventing the aborted task from reappearing through automatic restoration.

Walkthrough

The task preserves existing abort reasons during stream-error handling and retry backoff. The provider emits TaskAborted without rehydrating the task. Regression tests cover both changes.

Changes

Task abort lifecycle

Layer / File(s)	Summary
Preserve the first abort reason src/core/task/Task.ts, src/core/task/__tests__/Task.abort-reason-race.spec.ts	The task sets "user_cancelled" only when no abort reason exists, including during mid-stream retry backoff. Regression tests check the reason after cancellation during stream-failure cleanup and retry backoff.
Remove task rehydration on abort src/core/webview/ClineProvider.ts, src/core/webview/__tests__/ClineProvider.taskHistory.spec.ts	The provider emits TaskAborted without rehydrating a task after a streaming_failed abort. A regression test verifies that createTaskWithHistoryItem is not called.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Medium

🚥 Pre-merge checks | ✅ 7 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Regression Evidence	⚠️ Warning	The main race has focused coverage, and the removed ClineProvider rehydration path has a focused negative test. However, the changed nullish-assignment behavior is not fully covered. In `Task.abort-…	Add a Task-level test that reaches the stream-error abort path with abort === true and abortReason === undefined, then asserts line 3719 sets abortReason to "user_cancelled". Add a retry-backoff test with a pre-existing valid reason…

✅ Passed checks (7 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the primary change: preserving the first abort reason during task cancellation races.
Description check	✅ Passed	The description includes the linked issue, implementation details, regression test procedures, checklist status, and documentation impact. It is complete and directly aligned with the changes.
Linked Issues check	✅ Passed	The reviewed changes satisfy the coding requirements in [#1802]. Task.ts now uses nullish assignment for abortReason in both relevant abort paths, so an existing user_cancelled reason is preserv…
Out of Scope Changes check	✅ Passed	The production changes and tests directly support [#1802]. The reviewed whole-PR change summary shows no unrelated production behavior or unrelated files.
Security Boundaries	✅ Passed	No changed path meets the security failure condition. In Task.ts, the PR only preserves the existing internal abort reason with ??= "user_cancelled" before the existing abortTask() call. In `Cli…
Persistence Integrity	✅ Passed	No changed persistence path matches the failure conditions. Task.ts changes only in-memory abortReason assignments; the surrounding abortStream and abortTask paths still await `saveClineMessag…
Lifecycle Resource Cleanup	✅ Passed	PASS. The changed stream-error paths preserve the first abort reason with ??= and still call the existing idempotent abortTask() path. ClineProvider now forwards TaskAborted without rehydratin…

Full details: Regression Evidence

Explanation

The main race has focused coverage, and the removed ClineProvider rehydration path has a focused negative test. However, the changed nullish-assignment behavior is not fully covered. In Task.abort-reason-race.spec.ts, the cleanup-race test sets abortReason to "user_cancelled" before line 3719, so it does not verify the unset fallback; removing the ??= assignment would still leave the expected value. The retry-backoff test also sets abortReason to "user_cancelled" before line 3754, so the old unconditional assignment and the new assignment produce the same result. Therefore, the changed unset branch and the second path's first-reason-wins behavior lack discriminating focused coverage.

Resolution

Add a Task-level test that reaches the stream-error abort path with abort === true and abortReason === undefined, then asserts line 3719 sets abortReason to "user_cancelled". Add a retry-backoff test with a pre-existing valid reason such as "streaming_failed", leave it unchanged when the abort is detected, and assert that line 3754 preserves it; this test must fail with the base branch's unconditional assignment.

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Inline comments:
In `@src/core/task/__tests__/Task.abort-reason-race.spec.ts`:
- Around line 215-221: Update the race test for recursivelyMakeClineRequests to
verify the post-cleanup abort branch runs: add a call-through spy on abortTask
and assert it is called once, while retaining the didFinishAbortingStream
cleanup assertion. Do not mock abortTask’s implementation; preserve the existing
result and first-abort-reason assertions.

In `@src/core/webview/__tests__/ClineProvider.taskHistory.spec.ts`:
- Around line 978-980: Update the TaskAborted test to subscribe with a provider
listener before emitting the fake task’s event, then assert the listener is
called exactly once with the fake task’s ID. Keep the existing assertion that
createTaskWithHistoryItem is not called.

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🪛 GitHub Check: mutation-diff

src/core/webview/ClineProvider.ts

[warning] 409-409: Mutation test advisory
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src/core/task/Task.ts

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src/core/task/Task.ts (1)

3718-3720: LGTM!

src/core/webview/ClineProvider.ts (1)

409-409: LGTM!

[taltas]

One requested change below — everything else looks good (see review notes in the body of the comment).

[taltas]

Can we apply the same ??= in the sibling abort path below (the mid-stream retry backoff branch, this.abortReason = "user_cancelled" at line 3755)? It's a harmless no-op overwrite today, but using ??= in both places keeps the "first abort reason wins" invariant uniform across this whole catch block and avoids future readers wondering whether the two paths intentionally differ.

[edelauna]

Done. Also removed the now-redundant comment on that line since the code is self-explanatory.

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Inline comments:
In @src/core/task/__tests__/Task.abort-reason-race.spec.ts:
- Around line 203-205: In the retry-backoff test, update the
`backoffAndAnnounce` mock to seed `abortReason` with a distinct value such as
`streaming_failed`, then assert after `abortTask()` that this seeded reason
remains unchanged.

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🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
set -u
gh pr view 1811 --repo Zoo-Code-Org/Zoo-Code --json title,body,mergeable,reviewDecision,statusCheckRollup,changedFiles,files,headRefOid | jq '{title,body,mergeable,reviewDecision,statusCheckRollup,changedFiles,files,headRefOid}'
git diff --stat origin/HEAD...HEAD 2>/dev/null || :
gh pr diff 1811 --repo Zoo-Code-Org/Zoo-Code -- src/core/task/Task.ts src/core/task/__tests__/Task.abort-reason-race.spec.ts src/core/webview/ClineProvider.ts src/core/webview/__tests__/ClineProvider.taskHistory.spec.ts 2>&1 | head -420
rg -n -C2 'R-4|onTaskAborted|abortReason\s*\?\?=|streaming_failed' src/core/task/Task.ts src/core/webview/ClineProvider.ts | head -240

Length of output: 15611

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🏁 Script executed:

#!/bin/bash
set -u
git diff origin/HEAD...HEAD -- src/core/task/Task.ts src/core/task/__tests__/Task.abort-reason-race.spec.ts src/core/webview/ClineProvider.ts src/core/webview/__tests__/ClineProvider.taskHistory.spec.ts | head -510
printf '\n--- relevant outlines ---\n'
ast-grep outline src/core/task/Task.ts --match 'recursivelyMakeClineRequests|abortTask' --view expanded | head -85
ast-grep outline src/core/webview/ClineProvider.ts --match 'taskCreationCallback|cancelTask|createTaskWithHistoryItem' --view expanded | head -110
printf '\n--- ignore list ---\n'
rg -n -C3 'R-4|RSK-19' --glob '!**/node_modules/**' | head -110
printf '\n--- reviews ---\n'
gh pr view 1811 --repo Zoo-Code-Org/Zoo-Code --json reviews | jq '[.reviews[] | {author:.author.login,state,body,submittedAt}] | .[-12:]'

Length of output: 24753

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🏁 Script executed:

#!/bin/bash
set -u
printf '\n--- task error handling ---\n'
sed -n '3660,3805p' src/core/task/Task.ts
printf '\n--- abort definitions / sites ---\n'
rg -n -C3 'async abortTask\(|abortTask\(|abortReason\s*=|TaskAborted|async cancelTask\(|cancelTask\(' src/core/task/Task.ts src/core/webview/ClineProvider.ts | head -270
printf '\n--- issue ---\n'
gh issue view 1802 --repo Zoo-Code-Org/Zoo-Code --json title,body,comments | jq '{title,body,comments:[.comments[] | {author:.author.login,body}]}'
printf '\n--- review threads ---\n'
gh api graphql -F owner=Zoo-Code-Org -F name=Zoo-Code -F number=1811 -f query='query($owner:String!, $name:String!, $number:Int!) { repository(owner:$owner,name:$name) { pullRequest(number:$number) { reviewThreads(first:100) { nodes { isResolved path line comments(first:10) { nodes { author { login } body createdAt } } } } } } }' --jq '.data.repository.pullRequest.reviewThreads.nodes | map({isResolved,path,line,comments:[.comments.nodes[] | {author:.author.login,body,createdAt}]})' | tail -300
printf '\n--- filenames with ignore or lifecycle ---\n'
fd -i 'ignore|lifecycle|risk' | head -65

Length of output: 45685

---

@edelauna, yes from my code review. The current tests cover both abort-reason paths, and the provider test checks that TaskAborted does not trigger rehydration. All completed checks passed.

I have not formally approved the PR. GitHub still shows CHANGES_REQUESTED from @taltas, although the requested ??= change is present. Ask them to re-review; the PR review gate is still pending.

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