[Fix] Billed requests with no response when the provider errors mid-stream by zoomote[bot] · Pull Request #1597 · Zoo-Code-Org/Zoo-Code

zoomote · 2026-09-11T01:23:20Z

Related GitHub Issue

Reported in Discord: recurring "billed but no response" failures on Claude Sonnet where the request row shows cancelReason: streaming_failed. No GitHub issue exists yet.

Description

When a provider stream fails mid-stream, the retry path previously re-submitted the same request without a bound. Each attempt could re-bill the full input context while producing no visible result.

This PR bounds automatic mid-stream retries at three, exposes each retry through the existing backoff countdown, and hands control to the user through the existing API failure prompt when the budget is exhausted. Approving starts a fresh bounded round without duplicating conversation history; declining records an assistant failure and stops. The owned request is tracked and removed by its stable messageId, so a context summary appended later remains intact. Replacement persistence is fail-closed and rolls back at the original position on failure. Direct task disposal cancels pending retry backoff and failure prompts.

The retry threshold is a production-backed pure decision used by a bounded protocol model. The model separately explores backoff cancellation and prompt cancellation alongside success, failure, approval, decline, retry visibility, exact budget exhaustion, and reset semantics through pnpm lifecycle:model-check. A real VS Code extension-host E2E injects a valid partial SSE chunk followed by transport failure and verifies exactly four provider requests, visible retry state, and stable waiting at the failure prompt.

Test Procedure

Focused retry/disposal suites: 137/137 passed.
xvfb-run -a env USE_MOCK=true TEST_FILE=mid-stream-retry.test pnpm --filter @roo-code/vscode-e2e test:run: 1/1 passed.
node scripts/stryker-diff.mjs ci --base 1165aebc84ac9d960885ac79b97dad8a7c78c84e --head 23613e508230bb4bcc2a61be4ddb26d82a8eab8b: passed with no surviving or uncovered changed-code mutants.
pnpm lifecycle:model-check: all seven bounded submodels passed; the retry model reached 34 states, 7/7 actions, and 5/5 semantic landmarks.
pnpm test: 8253 passed / 39 skipped across 10 successful tasks.
pnpm lint and pnpm check-types: passed across all packages.

Pre-Submission Checklist

Issue Linked: This PR is linked to an approved GitHub Issue. No issue currently exists for the Discord report.
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): Not applicable; this reuses existing retry and failure chat rows without changing rendered UI.
Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Documentation Updates

No user documentation updates are required. Internal architecture documentation describes the seventh lifecycle submodel, its distinct cancellation boundaries, and the E2E scope.

coderabbitai · 2026-09-11T01:23:28Z

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docs/architecture/task-lifecycle-model.md
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src/core/task/Task.ts
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src/core/task/__tests__/Task.spec.ts
src/core/task/Task.ts

🔇 Additional comments (6)

📝 Summary

Summary by CodeRabbit

Bug Fixes
- Improved handling of API stream failures after partial responses.
- Automatic retries are limited to three attempts, with retry delays applied consistently.
- Users are prompted when further retries require approval.
- Approved retries no longer duplicate the original request in history.
- Failed requests now end cleanly with an error recorded in the conversation.
- Disposing a task now cancels pending requests promptly.
- Cancelling during a retry delay now stops the task as expected.

Walkthrough

The task now limits automatic mid-stream retries to three attempts. After exhaustion, it prompts for approval, prevents duplicate user messages, records declined failures, and resets the retry budget after approval. Unit, model-check, disposal, and end-to-end tests cover the flow.

Changes

Mid-Stream Retry Handling

Layer / File(s)	Summary
Retry control and history recovery `src/core/task/Task.ts`, `src/core/task/midStreamRetry.ts`, `src/core/task/__tests__/*`	The task bounds automatic retries, tracks user-message insertion, handles approval and decline, updates conversation history, aborts pending prompts during disposal, and validates failure recovery.
Retry state-model validation `scripts/check-mid-stream-retry.ts`, `package.json`, `docs/architecture/task-lifecycle-model.md`	The lifecycle model explores retry, backoff, cancellation, approval, and decline states. The model check runs as part of the lifecycle validation command.
End-to-end retry verification `apps/vscode-e2e/src/suite/mid-stream-retry.test.ts`	The VS Code test simulates a partial stream failure and verifies three automatic retries, a retry announcement, and no additional request while awaiting approval.

Priority: ➖ Normal

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Bug fix

Suggested reviewers: hannesrudolph

Merge Risk: ⚪ Minimal · up to 23613

The bounded retry flow, approval/decline handling, history recovery, and cancellation paths have focused coverage with no remaining concrete merge-blocking risk.

Caution

Pre-merge checks failed

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

Ignore (reviewers only)

❌ Failed checks (2 errors, 1 warning)

Check name	Status	Explanation	Resolution
Persistence Integrity	❌ Error	The changed decline path can lose the synthetic failure record. In `src/core/task/Task.ts` (the new `api_req_failed` decline branch), the code awaits `addToApiConversationHistory` and then increments …	Make the new decline path verify durable persistence. Return the save result from `addToApiConversationHistory` or add a dedicated result for this branch, and retry with cancellation when the initial save fails. If persistence still fails, …
Lifecycle Resource Cleanup	❌ Error	Direct disposal can still start a provider request. The changed `disposeOnce()` sets `this.abort = true` and calls `cancelCurrentRequest()`, but `recursivelyMakeClineRequests()` checks `this.abort` on…	Add cancellation guards after each cancellable setup await and immediately before starting `attemptApiRequest()`. Add an abort check at the start of `attemptApiRequest()` and again before `api.createMessage()`, so disposal cannot create a n…
Description check	⚠️ Warning	The description clearly explains the implementation and provides detailed test results, but it does not link an approved GitHub Issue. It explicitly states that no issue exists and leaves the required…	Create or identify the approved GitHub Issue, replace the Discord-only reference with `Closes: #<issue-number>`, and mark the Issue Linked checklist item as complete.

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the primary fix: preventing billed requests without a response when a provider fails mid-stream.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Regression Evidence	✅ Passed	PASS. The changed mid-stream retry behavior has focused Task-level coverage for the retry cap, visible backoff, decline, approval and budget reset, empty continuation, exact request-message lookup fai…
Security Boundaries	✅ Passed	No concrete security-boundary failure is introduced. The changed retry path in `src/core/task/Task.ts` uses internally generated `messageId` values and exact `messageId` plus `role === "user"` matchin…

Full details: Description check

Explanation

The description clearly explains the implementation and provides detailed test results, but it does not link an approved GitHub Issue. It explicitly states that no issue exists and leaves the required checklist item unchecked.

Full details: Persistence Integrity

Explanation

The changed decline path can lose the synthetic failure record. In src/core/task/Task.ts (the new api_req_failed decline branch), the code awaits addToApiConversationHistory and then increments messageCounts.assistant and returns. addToApiConversationHistory catches a failed saveApiConversationHistory() and records saved = false, but it returns no status and performs no rollback. The new caller does not invoke the existing persistence retry or check that flag. If the API-history write fails during a declined retry, the failure message remains only in memory while the task reports completion of this branch; disposal or process termination before a later save loses the record, and the in-memory assistant count is inconsistent with persisted history. The underlying JSON writer is atomic, but that does not provide recovery for this unhandled failed write.

Resolution

Make the new decline path verify durable persistence. Return the save result from addToApiConversationHistory or add a dedicated result for this branch, and retry with cancellation when the initial save fails. If persistence still fails, either roll back the synthetic assistant message and messageCounts.assistant and report the partial failure, or keep the task in an explicit failed/pending-persistence state that guarantees a later durable retry. Do not return from the decline path as if the failure record was persisted when the save result is false.

Full details: Lifecycle Resource Cleanup

Explanation

Direct disposal can still start a provider request. The changed disposeOnce() sets this.abort = true and calls cancelCurrentRequest(), but recursivelyMakeClineRequests() checks this.abort only at the start of the stack iteration. If disposal occurs while getEnvironmentDetails(), persistence, diffViewProvider.reset(), or model/tool setup is awaiting, execution continues to attemptApiRequest(). That generator has no initial abort check and creates a new AbortController immediately before api.createMessage(). Because disposal saw no controller during the setup race, the provider request can run after disposal and can create another billed request. The new direct-disposal test establishes this cancellation scenario, but it does not cover disposal during request setup. The pending ask("api_req_failed") path also leaves its 2-second status timer uncleared: the abort branch throws before timeouts.forEach(clearTimeout).

Resolution

Add cancellation guards after each cancellable setup await and immediately before starting attemptApiRequest(). Add an abort check at the start of attemptApiRequest() and again before api.createMessage(), so disposal cannot create a new provider request after cancelCurrentRequest() has run. Track and clear pending ask() status and auto-approval timers when abort causes the ask to reject, and prevent their callbacks from mutating or notifying a disposed task. Add tests that dispose during request preparation and assert that api.createMessage() is not called, and that disposal leaves no pending ask timers.

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codecov · 2026-09-11T01:27:41Z

Codecov Report

❌ Patch coverage is 91.89189% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/core/task/Task.ts	91.17%	0 Missing and 3 partials ⚠️

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github-actions · 2026-09-11T01:30:10Z

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edelauna · 2026-09-11T01:57:19Z

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Inline comments:
In `@src/core/task/__tests__/Task.spec.ts`:
- Around line 743-747: Extend the approved-retry test around the
apiConversationHistory assertions to verify the final messageCounts user and
assistant values, matching the expected conversation history counts. Use exact
behavior-focused assertions so an incorrect user counter mutation cannot pass
while preserving the existing history checks.
- Around line 694-695: Update the retry announcement assertion in the relevant
Task test to count finalized api_req_retry_delayed calls and assert the exact
count is three, verifying one announcement for each automatic retry instead of
merely requiring a positive count.

In `@src/core/task/Task.ts`:
- Around line 3684-3690: Update the retry flow around shouldAddUserMessage and
the approved-retry branch in Task to carry an explicit flag indicating whether
the current request added the user message through automatic retries. Only pop
the final user message and decrement messageCounts.user when that flag is true,
and preserve existing history for empty continuations; add a regression test
covering exhausted retry with empty user content and pre-existing history.

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GitHub Actions: Changed-code mutation testing / 0_mutation-diff.txt: [Fix] Billed requests with no response when the provider errors mid-stream

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##[group]Run node scripts/stryker-diff.mjs ci --base "$BASE_SHA" --head "$HEAD_SHA"
 �[36;1mnode scripts/stryker-diff.mjs ci --base "$BASE_SHA" --head "$HEAD_SHA"�[0m
 shell: /usr/bin/bash -e {0}
 env:
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   STORE_PATH: /home/runner/setup-pnpm/node_modules/.bin/store/v10
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 ##[endgroup]
 Mutation-testing 1 package(s) from merge base 1165aebc84ac: extension (49 lines)
 ##[error]Survived StringLiteral mutant (replacement: ``). See the job summary for the complete list and resolution guidance.

GitHub Actions: Changed-code mutation testing / mutation-diff: [Fix] Billed requests with no response when the provider errors mid-stream

Conclusion: failure

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##[group]Run node scripts/stryker-diff.mjs ci --base "$BASE_SHA" --head "$HEAD_SHA"
 �[36;1mnode scripts/stryker-diff.mjs ci --base "$BASE_SHA" --head "$HEAD_SHA"�[0m
 shell: /usr/bin/bash -e {0}
 env:
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   STORE_PATH: /home/runner/setup-pnpm/node_modules/.bin/store/v10
   BASE_SHA: 1165aebc84ac9d960885ac79b97dad8a7c78c84e
   HEAD_SHA: a28a30cc64f81a39f1622ba3d325bd80256fa41c
 ##[endgroup]
 Mutation-testing 1 package(s) from merge base 1165aebc84ac: extension (49 lines)
 ##[error]Survived StringLiteral mutant (replacement: ``). See the job summary for the complete list and resolution guidance.

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Check persistence and lifecycle invariants: awaited atomic writes, rollback or explicit partial-failure behavior, cross-window state consistency, stale listeners/watchers, cancellation, idempotency, and safe restart/resume without lost or d...

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src/core/task/Task.ts

[failure] 3690-3690: Mutation test gap
Survived BooleanLiteral mutant (replacement: false). See the job summary for the complete list and resolution guidance.

[failure] 3689-3689: Mutation test gap
Survived UpdateOperator mutant (replacement: this.messageCounts.user++). See the job summary for the complete list and resolution guidance.

[failure] 3687-3687: Mutation test gap
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[failure] 3684-3684: Mutation test gap
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[failure] 3683-3683: Mutation test gap
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[failure] 3674-3674: Mutation test gap
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[failure] 3669-3669: Mutation test gap
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🔇 Additional comments (2)

zoomote · 2026-09-11T02:37:58Z

Fixed the four Sep 12 CodeRabbit findings at 23613e508230bb4bcc2a61be4ddb26d82a8eab8b.

Documentation now accurately limits E2E coverage to the failure prompt; it no longer claims terminal decline.
The retry model has distinct abort-backoff and abort-prompt actions and landmarks (34 states, 7/7 actions, 5/5 landmarks).
The empty-continuation approval test completes a fresh retry round and declines at the second exhaustion without setting task.abort.
Approved retry cleanup carries the exact request messageId, preserves a later context summary, replacement-persists deletion, and rolls back at the original index on failure.

Validation passes: 137 focused tests, targeted extension-host E2E 1/1, full pnpm test 8253 passed / 39 skipped, lint, typecheck, all lifecycle models, and the exact changed-code mutation gate with no surviving or uncovered mutants. Browser proof was not applicable because no rendered UI changed.

All four CodeRabbit bot threads were resolved after the pushed fixes. No human threads or unrelated files were changed. Latest GitHub snapshot: 16 successful, 0 failing, 2 in progress (mutation-diff, Windows platform unit tests); Codecov patch passes at 91.89%. External gates remain draft status, no approved linked issue, and required human maintainer verification.

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
In `@apps/vscode-e2e/src/suite/mid-stream-retry.test.ts`:
- Line 78: Update the lifecycle documentation section describing partial-stream
retry coverage to remove the claim that the E2E suite covers terminal decline
behavior; keep the documentation aligned with the test in “bounds partial-stream
retries and surfaces the failure prompt,” which stops at api_req_failed, while
retaining lower-level coverage references such as Task.spec.ts.

In `@scripts/check-mid-stream-retry.ts`:
- Line 65: Add an abort transition to the awaiting-user state alongside decline
and approve, and add coverage that separately verifies prompt cancellation and
backoff cancellation. Ensure the transition typing and exhaustive behavior
remain valid across normal, retry, error, and cancellation paths.

In `@src/core/task/__tests__/Task.spec.ts`:
- Around line 748-750: Update the Task.ask mock in the relevant test so the
approved response does not set task.abort, allowing Task.say("api_req_retried")
and shouldRemoveMidStreamRetryMessage to execute. Configure the mock’s
subsequent exhausted-round response to return a decline, preserving the test’s
coverage of the empty-continuation branch.

In `@src/core/task/Task.ts`:
- Around line 3695-3697: Update the retry cleanup around
shouldRemoveMidStreamRetryMessage and summarizeConversation to record the
request user message’s messageId, then remove that exact history entry after
context management instead of removing by position. Preserve the save-failure
rollback, and decrement messageCounts.user only after the identified entry has
been removed.

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apps/vscode-e2e/src/suite/mid-stream-retry.test.ts
docs/architecture/task-lifecycle-model.md
package.json
scripts/check-mid-stream-retry.ts
src/core/task/Task.ts
src/core/task/__tests__/Task.dispose.test.ts
src/core/task/__tests__/Task.spec.ts
src/core/task/__tests__/midStreamRetry.spec.ts
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Check persistence and lifecycle invariants: awaited atomic writes, rollback or explicit partial-failure behavior, cross-window state consistency, stale listeners/watchers, cancellation, idempotency, and safe restart/resume without lost or d...

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src/core/task/__tests__/midStreamRetry.spec.ts
src/core/task/__tests__/Task.dispose.test.ts
src/core/task/midStreamRetry.ts
src/core/task/__tests__/Task.spec.ts
src/core/task/Task.ts

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src/core/task/__tests__/midStreamRetry.spec.ts
apps/vscode-e2e/src/suite/mid-stream-retry.test.ts
src/core/task/__tests__/Task.dispose.test.ts
src/core/task/__tests__/Task.spec.ts

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src/core/task/__tests__/midStreamRetry.spec.ts
apps/vscode-e2e/src/suite/mid-stream-retry.test.ts
src/core/task/__tests__/Task.dispose.test.ts
src/core/task/midStreamRetry.ts
src/core/task/__tests__/Task.spec.ts
scripts/check-mid-stream-retry.ts
src/core/task/Task.ts

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apps/vscode-e2e/src/suite/mid-stream-retry.test.ts

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src/core/task/__tests__/midStreamRetry.spec.ts
src/core/task/__tests__/Task.dispose.test.ts
src/core/task/midStreamRetry.ts
src/core/task/__tests__/Task.spec.ts
src/core/task/Task.ts

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docs/architecture/task-lifecycle-model.md
apps/vscode-e2e/src/suite/mid-stream-retry.test.ts
src/core/task/__tests__/Task.dispose.test.ts
package.json
src/core/task/midStreamRetry.ts
src/core/task/__tests__/Task.spec.ts
scripts/check-mid-stream-retry.ts
src/core/task/Task.ts

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edelauna · 2026-09-12T23:30:36Z

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fix: bound mid-stream API retries and surface failures after retry limit

79bf036

coderabbitai Bot requested changes Sep 11, 2026

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

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

Comment thread src/core/task/Task.ts Outdated

github-actions Bot added the awaiting-author PR is waiting for the author to address requested changes label Sep 11, 2026

test: model mid-stream retry lifecycle

ee1209b

github-actions Bot removed the awaiting-author PR is waiting for the author to address requested changes label Sep 11, 2026

roomote added 7 commits September 11, 2026 02:43

fix: close retry lifecycle gaps

c701b82

test: cover retry failure boundaries

24d86f8

refactor: simplify retry message ownership

34b2113

test: scope retry mutation exclusions

26e0547

test: isolate retry protocol mutations

45d13f2

refactor: make retry ownership explicit

48a86e1

refactor: centralize retry ownership defaults

4ea1fe5

coderabbitai Bot requested changes Sep 12, 2026

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Comment thread apps/vscode-e2e/src/suite/mid-stream-retry.test.ts

Comment thread scripts/check-mid-stream-retry.ts Outdated

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

Comment thread src/core/task/Task.ts Outdated

github-actions Bot added the awaiting-author PR is waiting for the author to address requested changes label Sep 12, 2026

fix: remove exact request on approved retry

f852ba2

github-actions Bot removed the awaiting-author PR is waiting for the author to address requested changes label Sep 12, 2026

test: cover exact retry message lookup

23613e5

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