[juliusmarminge]

isHandoffSourceRun in apps/server/src/orchestration-v2/Orchestrator.ts accepted only completed, failed and interrupted runs. A run that started and then ended 'cancelled' (the provider reported it cancelled; a T3 Stop records 'interrupted') was therefore skipped both on an immediate provider switch (the latestHandoffRun lookup in the send path) and when a queued run on another provider was promoted (the coveredRuns filter). As a result the new provider never saw that run's prompt or response. The predicate now also accepts cancelled runs whose startedAt is non-null. Queued requests cancelled before they started have startedAt null and stay excluded; rolled_back runs stay excluded. The same predicate gates lastDeliveredRunForProviderThread, and there a non-completed run still has to have a provider turn for its attempt, so a cancelled run counts as delivered only if it actually reached the provider. ContextHandoffService's visibleConversationItems already keeps a cancelled run's items, except queued_turn user messages, so the handoff carries the run's visible history with its cancelled status. No new regex or parser. Repro: before the fix the two cancelled rows on factory/repro-34009 failed at assert.isDefined(handoff) and the other five 'hands off' rows passed; all pass after the fix.

Fixes #34009

Reproduction on main

Commit 1fed70c (origin/main). Reproduced through the server's real OrchestratorV2, effect worker and a temporary SQLite database in apps/server/src/orchestration-v2/testkit/ProviderSwitch.integration.test.ts, using test adapters; there was no live UI run. A started turn ends cancelled only when the provider itself reports it (an ACP stopReason cancelled without a T3 Stop, or a Codex turn that ends cancelled). Pressing Stop in T3 records interrupted, which already hands off. No provider on the VM produces a cancelled turn on demand. Steps: added cancelledRunOrdinals to the test adapter and two rows to the existing 'hands off %s' table: (cancelled, immediately, new provider) and (cancelled, through the queue, returning provider). In each, the source provider streams a prompt and response, the turn ends cancelled, then the thread switches provider and sends 'Continue'. Ran vp test run src/orchestration-v2/testkit/ProviderSwitch.integration.test.ts -t "hands off": both cancelled rows fail at assert.isDefined(handoff). The target run has no context handoff, so the new provider never receives the cancelled run's prompt or response. The four existing failed and interrupted rows pass. Temporarily accepting cancelled runs with a non-null startedAt in isHandoffSourceRun made all 7 rows pass; that change was reverted and only the tests were pushed.

Evidence

Environment for every capture: Linux, Chromium, dark theme, 1280×900 CSS pixels. Each commit ran the real web dev app and server from its own worktree with fresh isolated SQLite state (T3CODE_DEV_SEED=0). Both used identical synthetic data and scripted ACP subprocesses through the production adapter.

Steps on both commits:

1. Send the synthetic source prompt. The provider streams ORCHID-34009, then reports cancelled without pressing T3 Stop. Confirm cancelled with non-null startedAt.
2. Switch to a new destination provider and send Continue.
3. In a separate thread, first establish the destination session, then dispatch the source turn and queue Continue on the returning destination.
4. Wait for terminal states and inspect the destination's report of its actual incoming ACP prompt.

Both paths report NO/NO/NO on base and YES/YES/YES on head for receiving the source prompt, response and cancelled status. Head creates the missing handoff, including cancelled run ordinal 2 in the queued-return case. Recordings were visually inspected; final stills passed identical screenshot comparisons at least 500 ms apart (AE=0).

Before	After
1fed70cd19	507051f751
Immediate-switch recording	Immediate-switch recording
Queued returning-provider recording	Queued returning-provider recording

ACP provider script · Browser driver and seed script · Reproduction instructions · Observed runtime summary

AI-assisted; verified with the tests and tools listed above.

Not shown:

• Vendor-specific cancellation generation, including Codex: cancellation was emitted by a deterministic ACP subprocess; no live vendor cancellation was exercised.
• Queued requests cancelled before starting and rolled-back runs remaining excluded: these exclusion cases were not exercised in the app.
• Desktop, mobile, relay and tunnel modes: verification covered the local web client and real server only.

Tests

Before the fix: vp test run src/orchestration-v2/testkit/ProviderSwitch.integration.test.ts -t "hands off" gave 2 failed (the cancelled rows), 5 passed. After the fix: vp test run src/orchestration-v2/testkit/ProviderSwitch.integration.test.ts gave 51/51 passed. vp run check:changed passed format, lint, knip, typecheck (3 packages) and the tests beside the change (5 files).

Not in this change

• The git.cafe credential setup on this VM: the global config sets credential.https://git.cafe.usehttppath=true, but the stored credential has no path, so a plain git push origin fails to authenticate (cafe auth http status reports 'conflicting'). I pushed with -c credential.https://git.cafe.usehttppath=false for that one command and left the global config unchanged. Category: infra/FRICTION.

AI-assisted; verified with the tests and tools listed above.

[macroscopeapp]

Approvability

Verdict: Approved at 507051f

Macroscope's review found this PR approvable — Provider switches now preserve context from cancelled runs that had already started, while excluding requests cancelled before execution. Existing thread boundaries and handoff policy checks continue to constrain the transfer.

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

[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

ℹ️ The exact PR base did not have a successful artifact. Baseline uses the latest successful main measurement shown below.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	5.0 KiB	5.0 KiB	0 B (0.0%)	6.8 KiB	✅
Codex	Thread snapshot wire	3.8 KiB	3.8 KiB	0 B (0.0%)	4.9 KiB	✅
Codex	Live turn WebSocket wire	1.2 KiB	1.2 KiB	0 B (0.0%)	2.0 KiB	✅
Codex	Live turn WebSocket decoded	21.5 KiB	21.5 KiB	0 B (0.0%)	24.4 KiB	✅
Codex	Live turn messages	1	1	0 (0.0%)	8	✅
Claude	Total thread wire	5.0 KiB	5.0 KiB	0 B (0.0%)	6.8 KiB	✅
Claude	Thread snapshot wire	3.8 KiB	3.8 KiB	0 B (0.0%)	4.9 KiB	✅
Claude	Live turn WebSocket wire	1.2 KiB	1.2 KiB	0 B (0.0%)	2.0 KiB	✅
Claude	Live turn WebSocket decoded	21.9 KiB	21.9 KiB	0 B (0.0%)	24.4 KiB	✅
Claude	Live turn messages	1	1	0 (0.0%)	8	✅

Baseline: 71a1c49 · PR result: 507051f · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 108.5 KiB
• Claude decoded thread snapshot: 108.8 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

[coderabbitai]

Walkthrough

The handoff-source predicate now includes cancelled runs when startedAt is non-null. Provider-switch integration tests add immediate and queued cancellation cases and update the test adapter to emit cancelled terminal statuses.

Changes: Cancelled run handoff

Layer / File(s)	Summary
Handoff eligibility and integration coverage apps/server/src/orchestration-v2/Orchestrator.ts, apps/server/src/orchestration-v2/testkit/ProviderSwitch.integration.test.ts	The predicate includes cancelled runs that have started and continues to exclude cancelled runs that have not started. The test adapter and handoff test matrix now support cancelled source runs. The run-wait helper accepts cancelled as an expected status.

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

Suggested labels: bugfix

Suggested reviewers: t3dotgg

Merge Risk: Minimal · up to 50705

Started, cancelled runs are now eligible for handoff, with tests checking retained history and status. No material merge risk remains identified.

Pre-merge checks: 3 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Description check		The description explains the problem, change, scope, and verification in detail. It links the issue but does not provide the required maintainer approval comment or explain why the fix qualifies for a…	Add the maintainer approval comment that confirms the direction and scope, or explain why this focused fix qualifies for an exemption. Also name the AI model and harness used, as required when an agent was used.

Passed checks: 3 passed

Check name	Status	Explanation
Title check		The title clearly and concisely describes the main change: provider switches now hand off started cancelled runs.
Linked Issues check		Issue #34009 requires handoff of visible history from started cancelled runs during immediate switching and queued promotion, while excluding queued requests cancelled before starting and rolled-back …
Out of Scope Changes check		The whole-PR diff changes only the handoff predicate in Orchestrator.ts and the provider-switch integration fixture and cases. These production and test changes directly support issue #34009. No unr…

Full details: Linked Issues check

Explanation

Issue #34009 requires handoff of visible history from started cancelled runs during immediate switching and queued promotion, while excluding queued requests cancelled before starting and rolled-back runs. isHandoffSourceRun now accepts cancelled only when startedAt !== null; the diff leaves the existing rolled_back exclusion unchanged. The integration test adds cancelled-run cases for immediate and queued switching. The PR description also states that handoff items retain the cancelled status and that lastDeliveredRunForProviderThread still requires a provider turn for non-completed runs.

Full details: Out of Scope Changes check

Explanation

The whole-PR diff changes only the handoff predicate in Orchestrator.ts and the provider-switch integration fixture and cases. These production and test changes directly support issue #34009. No unrelated changes appear.

Full details: Description check

Explanation

The description explains the problem, change, scope, and verification in detail. It links the issue but does not provide the required maintainer approval comment or explain why the fix qualifies for an approval exemption. It also says AI assistance was used but does not name the model and harness.

Resolution

Add the maintainer approval comment that confirms the direction and scope, or explain why this focused fix qualifies for an exemption. Also name the AI model and harness used, as required when an agent was used.

Finishing Touches

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[coderabbitai]

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Review info

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• Source mode: Auto
• Repository: pingdotgg/t3code
• Branch: factory/issue-34009
• File: .coderabbit.config.ts
• Commit: 507051f
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Commits

Reviewing files that changed from the base of the PR and between e8d3075 and 507051f.

Files selected for processing: 2

• apps/server/src/orchestration-v2/Orchestrator.ts
• apps/server/src/orchestration-v2/testkit/ProviderSwitch.integration.test.ts

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