[fixfon]

Problem

A delegated task cancelled while waiting for command approval can finish as interrupted while its approval remains pending. This occurs when the provider's terminal event commits before interruption cleanup, leaving the old approval actionable and the thread needing attention.

Change

Withdraw the stopped turn's pending native approvals alongside questions, marking approvals cancelled and non-resumable and cancelling their associated nodes and timeline items. Preserve requests belonging to other turns and approvals on completed or failed root turns, whose background subagents may still need them. Recheck pending state inside the write transaction in both directions: cleanup cannot overwrite a concurrent answer, and a response planned before cancellation cannot restore the cancelled request or queue a provider response. Stale responses return the existing cancelled-request error.

Scope and approval

Fixes https://git.cafe/pingdotgg/t3code/issues/21935
GitCafe: #21935
Triaged bug via the automated issue flow. Existing contributor implementation and author credit retained. Approval lifecycle changes require Julius's review. The PR has bugfix; it has not been merged or labeled land.

Verification

Merged current main at 26c3625f48 into the branch as 7557986e99. Preserved main’s reader-connection routing for the renamed request query. On this merge: 68 focused tests passed across ProviderEventIngestor, ProjectionStore and ProviderTurnControlService; server typecheck, scoped lint (one existing warning) and format passed. Live-client evidence gaps below remain unverified.

• Follow-up regression on b3dbe20998: both command approval and user-input response cases fail with resolved instead of cancelled when cancellation commits after planning and before the response write. The transaction guard makes both cases pass.

• Final follow-up head: 04df7b638c. Both reverse-race cases assert the exact cancelled-request error, rolled-back receipt, cancelled timeline item and empty outbox; a mutation wrapping the error fails both cases.

• Follow-up checks: 279 tests across 11 targeted files pass; server package typecheck passes. Targeted lint reports only an existing unused layerUnavailable warning. Two independent reviews found no production blockers.

• Main snapshot 3b95e7831b: minimal ingestor regression test fails in both interrupted terminal paths with expected 'pending' to equal 'cancelled'; completed-turn control passes.

• Candidate b3dbe20998, after merging that main snapshot: ingestor, SQL/in-memory projection store, and turn-control suites pass, 63/63 tests. Includes concurrent-answer protection.

• Targeted lint on the six changed files passes. vp run typecheck in apps/server exits 0 with no TypeScript errors. git diff --check passes.

• Historical real Codex cancellation reproduction demonstrates the terminal-event ordering behind the bug.

• Seven preserved local provider attempts cleared approvals normally; they do not reproduce the race. A new real-app attempt on the main snapshot was blocked by VM event-loop stalls, disconnects, and EnvironmentNotRegisteredError after pairing.

Sanitized red/green server evidence.

Evidence: server tests prove the state transition; fresh before/after interaction recordings are missing. Proof audit is incomplete. Pending approval → parent cancellation → cleared child/parent UI, live child approval after normal root completion, and reconnect after cancellation remain unverified in a real client. Web, desktop/Electron, mobile, OpenCode v2 and Muse runtime behavior remain unverified. No UI capture or complete end-to-end verification is claimed.

Original implementation: Claude Sonnet 5.5 via T3 Code. Integration and verification: GPT-6.1-Sol and Claude Opus 5.5 through Codex and Claude harnesses in T3 Code.

Fixes #21935

[macroscopeapp]

Approvability

Verdict: Approved at 71119ed

Macroscope's review found this PR approvable — This is a focused server fix that withdraws pending approvals only when their provider turn is interrupted or cancelled, while preserving completed and failed turn behavior. SQL and in-memory projections plus terminal-status coverage are included, with no schema, configuration, or deployment changes.

^{You can add or adjust custom eligibility rules. Learn more.}

[coderabbitai]

Walkthrough

The projection store now retrieves pending native requests and can include approvals. Provider-turn cleanup dismisses applicable requests. The event sink validates cancellations and resolved responses against projected state, and MCP dispatch exposes a specific error for requests that are no longer pending.

Changes: Pending native request cleanup

Layer / File(s)	Summary
Pending native request query apps/server/src/orchestration-v2/ProjectionStore.ts, apps/server/src/orchestration-v2/ProjectionStore.test.ts, apps/server/src/orchestration-v2/ProviderTurnControlService.test.ts	The projection-store method now returns pending native requests for a provider turn, with optional approval inclusion. The test covers filtering by turn, status, request kind, and response capability.
Stopped-turn request cleanup apps/server/src/orchestration-v2/ProviderEventIngestor.ts, apps/server/src/orchestration-v2/ProviderEventIngestor.test.ts	Provider-turn termination now dismisses applicable native requests. Interrupted or cancelled turns also include pending approvals, and cancelled non-user-input requests receive a non-resumable response capability. Tests cover terminal outcomes and response races.
Request update validation and error mapping apps/server/src/orchestration-v2/EventSink.ts, apps/server/src/orchestration-v2/ProviderEventIngestor.test.ts, apps/server/src/mcp/threadAccess.ts, apps/server/src/mcp/toolkits/core.test.ts	The event sink checks cancellation candidates and resolved requests against projected state. It reports a specific error when a resolved request is missing or no longer pending, and MCP dispatch maps that error to an orchestration error.

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

Change: Bug fix · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant ProviderEventIngestor
  participant ProjectionStore
  participant EventSink
  ProviderEventIngestor->>ProjectionStore: Retrieve pending requests for the provider turn
  ProviderEventIngestor->>EventSink: Commit request cancellations
  EventSink->>EventSink: Validate resolved request against projected state

Loading

Possibly related issues

• Resume Thread is offered while a pending approval makes continuation ineligible #26699: The issue reports pending approvals after an interrupted turn; this change withdraws approvals for interrupted or cancelled turns and marks cancelled approvals non-resumable.

Suggested reviewers: juliusmarminge, t3dotgg

Merge Risk: Minimal · up to 7a2a3

Stopped turns now withdraw their pending approvals, and stale responses are rejected with a clear cancelled-request error. No concrete merge-blocking risk remains. Real-client behavior is still unverified, as the PR itself discloses.

Security architecture risk: Low · up to 90f78

Cleanup remains restricted to the stopped turn and does not add approval authority. However, cancellation can race an approval response and leave the recorded outcome inconsistent with the accepted decision. The identified impact is bounded to the affected requests; unauthorized execution has not been established.

Retained concerns

• Medium · reliability · inferred: Stopped-turn cleanup adds approval cancellation without extending the existing write-time stale-state guard. If an approval response commits after cleanup reads pending state but before cleanup writes, cancellation replaces the resolved decision and cancels its node and item; the queued response may then fail its execution-time check. The reverse interleaving can replace cancellation with a stale resolved payload retaining live capability. This makes the persisted approval outcome depend on scheduling rather than one authoritative terminal transition. Earlier decision events remain in history, and unauthorized provider execution is not established.

Security review details

Security Blast Radius

• observed — A cleanup invocation selects pending requests from one thread and one provider turn. Other-turn and null-turn session requests are excluded, and message-mode user inputs remain outside native cleanup. Approval inclusion broadens eligible request kinds, not thread or session authority.

Security Findings and Attack Paths

• inferred — The supported adverse path requires an approval response and stopped-turn cleanup to overlap for the same request. It can corrupt the current decision projection or disrupt delivery of an accepted response. It does not establish cross-thread access, privilege escalation, or execution without a user decision; earlier decision events are not deleted.

Trust Boundaries and Controls

• observed — Response dispatch rejects requests already observed as non-pending or not_resumable. Before invoking the provider callback, execution independently requires a resolved request, a live capability naming the expected provider session, and an active session. These existing checks limit stale-response exposure but do not provide a write-time compare-and-set for the approval transition.

Hardening Proposals

• proposed — Make approval resolution and stopped-turn cancellation contend on one authoritative transition check. Preserve request, node, and turn-item consistency when either transition loses, and validate both commit orderings using the existing gated-write concurrency pattern.

Pre-merge checks: 4

Check name	Status	Explanation
Title check		The title clearly and concisely describes the primary change: withdrawing pending approvals when a turn is stopped.
Description check		The description includes all required sections and clearly explains the problem, implementation, scope approval, and verification results. It also discloses remaining real-client and UI verification g…
Linked Issues check		Issue #21935 requires unresolved approvals to be withdrawn when their provider turn is interrupted or cancelled. ProviderEventIngestor queries pending native requests with approvals enabled for thos…
Out of Scope Changes check		The changed production files support issue #21935. ProjectionStore selects approvals for cleanup, ProviderEventIngestor withdraws them, and EventSink prevents stale cleanup or response effects. …

Full details: Description check

Explanation

The description includes all required sections and clearly explains the problem, implementation, scope approval, and verification results. It also discloses remaining real-client and UI verification gaps.

Full details: Linked Issues check

Explanation

Issue #21935 requires unresolved approvals to be withdrawn when their provider turn is interrupted or cancelled. ProviderEventIngestor queries pending native requests with approvals enabled for those statuses, then writes cancelled runtime requests with not_resumable capability and cancels related nodes and turn items. ProjectionStore scopes the query to the provider turn and excludes resolved requests. EventSink rechecks pending status, request kind, and provider turn inside the transaction, so concurrent answers are preserved and stale responses fail. The tests cover interrupted and cancelled approval cleanup, turn scoping, completed-turn preservation, and both response races.

Full details: Out of Scope Changes check

Explanation

The changed production files support issue #21935. ProjectionStore selects approvals for cleanup, ProviderEventIngestor withdraws them, and EventSink prevents stale cleanup or response effects. The threadAccess change preserves the cancellation error for the related MCP response path. The added tests verify these behaviors. No unrelated change is demonstrated in the supplied whole-PR summary.

Finishing Touches

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[ScottN-PV]

Written by Claude Opus 5.5 on behalf of @ScottN-PV.

Real-run data for "What I couldn't prove", in case it helps. We did not run this patch.

On main b34501a, a Codex parent used delegate_task to start an approval-required child, which blocked on a shell-command approval. The parent's task_cancel returned cancel_requested, then interrupted. In both of two runs, the approval went from pending to cancelled/not_resumable with the reason "The run was interrupted." That reason comes from the request loop in Orchestrator.settleInterruptedRun (#15442). The reporter's v0.0.46-nightly.20261008.2819 already contains that loop, so it was present when their Codex approval stayed pending.

Not covered: Claude tasks, native subagents, Stop from the UI, timing variations.

[fixfon]

Thanks @ScottN-PV, this is useful. I agree: for a Codex parent's task_cancel, settleInterruptedRun already withdraws the approval, so that isn't the gap.

This PR covers a different path. settleInterruptedRun returns early unless the run and its attempt are still running. When a turn ends as interrupted or cancelled through ProviderEventIngestor, main only withdraws user-input requests there, so approvals stay pending. The regression test shows this on main.

I haven't confirmed in code which real scenario reaches that path, so I'm not claiming it explains the reporter's case.

[SudheerNaraharisetty]

Live data for the "What I couldn't prove" section. On main (7208335), a Codex task_cancel left the child's command approval pending.

Setup: a Supervised Codex parent used delegate_task to start a child, the child blocked on touch approved.txt, and the parent called task_cancel. The child run went to interrupted. The approval stayed pending, with a live Approve/Decline card, until I stopped the server.

Doesn't settleInterruptedRun already handle this, as @ScottN-PV saw? Sometimes. It only runs while the run is still running, and in my run Codex's turn/completed got there first. The provider log shows turn/interrupt, then turn/completed (interrupted), then serverRequest/resolved for the approval, within 19 ms.

A second run backs this up. With a turn-end withdrawal in the ingestor (close to this PR), the same cancel left the approval cancelled with its capability still live. That means the turn-end path withdrew it, not settleInterruptedRun, which writes not_resumable. In other words, a real cancel does reach the path this PR fixes.

Two smaller things from testing:

• Leaving completed turns out is right. I first tried withdrawing approvals on every turn end. A Claude background subagent asked for approval while the main turn ran, and when the main turn completed, its still-live callback was cancelled. The subagent hung with no card until Stop.
• The Codex handler leak you list is easy to close in the adapter. If the adapter settles the pending approval's Deferred with cancel when the turn ends interrupted, Codex gets a reply and the handler fiber finishes. The true result from Deferred.succeed also guards the approve-while-interrupting race. I have this with a failing-first adapter test and can send it as a separate PR once this one lands.

Thanks for writing up the turn-ownership cases so clearly.

[fixfon]

Thanks @SudheerNaraharisetty, this is really helpful. The provider-log ordering and your second run show that a real Codex cancel reaches this path. I've linked your comment in the "What I couldn't prove" section of the PR description. Thanks as well for confirming that completed turns should stay out.

[coderabbitai]

Caution

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⚠️ Outside diff range comments (1)

🟠 Major · Protect approval cancellations against a resolution race. · ProviderEventIngestor.ts:358

apps/server/src/orchestration-v2/ProviderEventIngestor.ts:358
🗄️ Data Integrity & Integration | 🟠 Major | 🏗️ Heavy lift

Protect approval cancellations against a resolution race.

guardPendingUserInputCancellations rechecks only user-input requests. An approval can resolve after selection and before the cancellation write, allowing stale cancellation events to overwrite the resolution.

Extend the guard to approval requests while continuing to exclude message-mode questions.

Suggested fix

-            event.payload.kind !== "user_input" ||
+            (event.payload.kind !== "user_input" &&
+              event.payload.responseCapability.type === "message") ||
             event.payload.status !== "cancelled"
@@
-            current.kind !== "user_input" ||
+            current.kind !== event.payload.kind ||
@@
-                event.payload.type !== "user_input_request" ||
+                (event.payload.type !== "user_input_request" &&
+                  event.payload.type !== "approval_request") ||

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Review comment at @apps/server/src/orchestration-v2/ProviderEventIngestor.ts at
line 358:
Update guardPendingUserInputCancellations to recheck approval requests as well
as user-input requests, while excluding message-mode questions. Require the
current request kind to match the event kind and allow both user-input and
approval request event types through the cancellation guard so resolved
approvals cannot be overwritten.

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Outside diff comments:
Review comments at @apps/server/src/orchestration-v2/ProviderEventIngestor.ts:
- Line 358: Update guardPendingUserInputCancellations to recheck approval
requests as well as user-input requests, while excluding message-mode questions.
Require the current request kind to match the event kind and allow both
user-input and approval request event types through the cancellation guard so
resolved approvals cannot be overwritten.

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[fixfon]

@coderabbitai Good catch, fixed. The guard now rechecks approval requests too (still pending, same kind and turn, message-mode left out), and there's a test for an approval answered after the pending requests were read.

[coderabbitai]

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@fixfon Thanks for fixing this and adding the regression test. The recheck addresses the race where an approval is answered after the pending requests are read.

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⚠️ Outside diff range comments (1)

🟠 Major · Validate the approval inside the serialized response write. · ProviderEventIngestor.ts:358

apps/server/src/orchestration-v2/ProviderEventIngestor.ts:358
🗄️ Data Integrity & Integration | 🟠 Major | 🏗️ Heavy lift

Validate the approval inside the serialized response write.

For an interrupted or cancelled turn, approval cleanup can cancel the request after Orchestrator.getRuntimeResponseContext(...) reads it as pending but before EventSink.commitCommand(...) appends the already-built resolved response. commitCommand serializes writes but does not revalidate the request. This can persist a resolved approval after cleanup marked it cancelled and not_resumable.

Validate pending, kind, and providerTurnId inside the serialized write transaction immediately before appending the response. A standalone read immediately before commitCommand does not close this race.

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Review comment at @apps/server/src/orchestration-v2/ProviderEventIngestor.ts at
line 358:
Update the serialized write path used by EventSink.commitCommand to revalidate
the approval immediately before appending the response, requiring it to remain
pending with the expected kind and providerTurnId. Do not rely on a standalone
read before commitCommand; preserve the existing includeApprovals behavior for
interrupted and cancelled turns.

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Outside diff comments:
Review comments at @apps/server/src/orchestration-v2/ProviderEventIngestor.ts:
- Line 358: Update the serialized write path used by EventSink.commitCommand to
revalidate the approval immediately before appending the response, requiring it
to remain pending with the expected kind and providerTurnId. Do not rely on a
standalone read before commitCommand; preserve the existing includeApprovals
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[fixfon]

On CodeRabbit's outside-diff note about the respond/cancel race: it's real, and it's the reverse of the case I covered. A late cancel can't overwrite an answer anymore, but a respond that read the request as pending before the interrupt can still commit "resolved" after the cancellation and queue a response effect for a turn that's gone. Approvals only hit this since this PR started cancelling them; questions have the same gap on main.

The fix I have in mind is small: commitCommand re-reads the request inside the transaction and rejects the respond if it's no longer pending or the kind or provider turn changed, and dispatchRuntimeRequestRespond maps that to the existing "is cancelled" error, with a latch test for the interleaving. @juliusmarminge since you're driving this branch now, want me to push that here, or keep it for a follow-up PR?

[juliusmarminge]

Keeping this race fix in this PR: the new approval cancellation path needs the response-side transaction check too. I have restarted a focused failing-test step after the previous task failed during the server restart; it will cover response reads pending → cancellation commits → response attempts commit. I will push the fix here after verification.

[juliusmarminge]

@coderabbitai resume

[coderabbitai]

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[juliusmarminge]

Fixed the reverse respond/cancel race in 04df7b638c. The response write transaction rechecks pending status, request kind and provider turn before committing events or effects. Stale responses return the existing cancelled-request error; receipt reservation rolls back. Both command and question regression cases failed before the fix and now pass, including exact error, absent receipt, cancelled item and empty outbox assertions. 279 targeted tests and server typecheck passed; both fresh reviewers found no code blockers. Existing client-proof gaps remain disclosed.

[coderabbitai]

Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @apps/server/src/orchestration-v2/Orchestrator.ts:
- Around line 11880-11881: Update the cause assignment in the Orchestrator error
wrapper to pass through the original error, including
EventSinkRuntimeRequestNotPendingError and its structured fields, instead of
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[juliusmarminge]

Fixed in f8d2a8dd9e: the dispatch wrapper preserves the tagged sink error as its cause. MCP exposes this specific safe cancellation message; other internal errors remain redacted. 47 focused tests, server typecheck, format and scoped lint passed (one existing lint warning). Real-client proof remains incomplete as disclosed.

[coderabbitai]

Nitpick comments: 1

apps/server/src/orchestration-v2/EventSink.ts: 1

83-83: Trivial · Maintainability & Code Quality · Low value

Export the error predicate and reuse it in threadAccess.ts.

isRuntimeRequestNotPending is private here. apps/server/src/mcp/threadAccess.ts Line 50 builds a second Schema.is(EventSinkRuntimeRequestNotPendingError) predicate. The repository rule says error predicates are exported directly, not duplicated per consumer. Export this one and import it in threadAccess.ts.

Proposed change

-const isRuntimeRequestNotPending = Schema.is(EventSinkRuntimeRequestNotPendingError);
+export const isRuntimeRequestNotPending = Schema.is(EventSinkRuntimeRequestNotPendingError);

As per path instructions, "Predicates are exported directly as export const isFoo = Schema.is(Foo)".

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Review comment at @apps/server/src/orchestration-v2/EventSink.ts at line 83:
Export the existing isRuntimeRequestNotPending predicate in EventSink.ts and update threadAccess.ts to import and reuse it instead of creating a duplicate Schema.is predicate.

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Nitpick comments:
Review comments at @apps/server/src/orchestration-v2/EventSink.ts:
- Line 83: Export the existing isRuntimeRequestNotPending predicate in
EventSink.ts and update threadAccess.ts to import and reuse it instead of
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[juliusmarminge]

The automated pipeline stopped on this pull request and will not merge it:

the capture step could not show the problem on the base commit, so there is nothing to prove fixed.

On each commit, create a synthetic project and replay thread, complete preparation turns, select Supervised permissions, send a prompt, leave the command approval unanswered, and click Stop generation. Repeat once, reload, and inspect approval controls and sidebar attention. Both commits withdrew approvals and kept them withdrawn after reload. These were ordinary root-turn stops, not the reported delegated Codex terminal-first race.

It stays open for a person to finish or close.