fix(server): Claude threads whose session is gone recover on the next send#31705

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fix/issue-31689

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Problem

A Claude thread whose native session the CLI no longer has (its transcript was deleted or pruned, for example by Claude Code's transcript cleanup) is stuck for good. Every send opens the CLI with resume: <id>, fails with "No conversation found with session ID: ", and the next send resumes the same id again, including after a restart. Reproduced in the web app on main: a Claude thread answers a first turn; with the server stopped, its transcript is removed; every later send and every restart shows the same provider error.

Change

The Claude adapter now treats the CLI's own answer as the signal. When a turn's result reports "No conversation found with session ID: " for the query's native id, the adapter remembers that id (in memory, adapter-wide, so it survives the provider session being released and reopened). It reports that provider thread as error, which already makes the session manager drop it from its loaded set, and resumeThread now fails for a remembered id. The existing resume fallback in ProviderTurnStartService then starts a fresh native session with a summary handoff, the same path used for metadata-only transcripts (#19637).

The turn that hits the error still shows it; the next send recovers. The server's transcript scan is unchanged and is not used to decide that a session is gone, because a custom claude binary can keep transcripts in a config directory the server cannot see.

Scope and approval

Fixes pingdotgg/t3code#31689

Triaged via the automated issue flow; GitCafe issue #31689.

Verification

ClaudeAdapterV2 resumeThread > fails after the CLI reports the resumed conversation is gone (apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.ts). Against main's adapter it fails at the first check of the bug: expected 'idle' to equal 'error' (the thread stays loaded after the CLI's error), and its original form failed with resumeThread accepted native-thread-lost after the CLI reported its conversation gone, so the next turn resumes it again: expected 'resumed' to equal 'ProviderAdapterResumeThreadError'. With the fix it passes, on the same session and after the session is reopened.
ClaudeAdapterV2.test.ts and ProviderTurnStartService.test.ts: 372 passed. Claude replay integration suites (ClaudeReplayFixtures, OrchestratorReplayRestartBackgroundNote, OrchestratorReplayRecovery): 44 passed. vp run check:changed: passed.
Real app run (web dev server, fresh database, a synthetic Claude thread asked to remember "PELICAN"), provider event log, relevant fields only:

text

1	main 938b4d4525, transcript of session 67a45216 removed while the server was stopped:
2	query.open resume=67a45216-… -> result error_during_execution "No conversation found with session ID: 67a45216-…"
3	query.open resume=67a45216-… -> same error (retry)
4	[server restart]
5	query.open resume=67a45216-… -> same error
6
7	fix 228b862da2, same thread after its session 6450226a lost its transcript the same way:
8	query.open resume=6450226a-… -> result error_during_execution "No conversation found with session ID: 6450226a-…" (shown once)
9	next send: WARN Recovering provider context in a fresh native session reason=resume_failed errorTag=ProviderAdapterResumeThreadError
10	query.open sessionId=6452164e-… -> result success, reply "PELICAN" (from the summary handoff)
11	[server restart]
12	query.open resume=6452164e-… -> result success, no fallback

Not checked: the desktop and mobile clients (no client code changes; the fix is server-side), and the window between a failed turn and a server restart, where the remembered id is lost and the next send fails once more before the fallback runs.

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

Checks

22 successful · 12 skipped

All checks passed

Added 2 commits7d ago

fix(server): Claude threads whose conversation is gone start a fresh session228b862
test(server): reproduce Claude resuming a lost conversation forever (#31689)5f0594d

MmacroscopeappBotapproved these changes · review dismissed7d ago

MmacroscopeappBot7d ago

Approvability

Verdict: Approved at 01aabda

Macroscope's review found this PR approvable — Claude threads whose native conversation is missing now use the existing fresh-session recovery path on the next send. The change is limited to explicitly reported missing sessions and preserves application thread identity and context-handoff handling.

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

Ggithub-actionsBot7d ago

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

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: 9cd7a04 · PR result: 01aabda · 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.

CcoderabbitaiBot7d ago

Explain Change →

Walkthrough

ClaudeAdapterV2 records native thread IDs when Claude reports that a conversation is missing. It marks affected threads as errored and rejects later resume attempts. A regression test covers the failed turn and resume attempts in the current and a new provider session.

Changes: Claude Missing-Session Handling

Layer / File(s)	Summary
Detect and record missing native sessions `apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.ts`	ClaudeAdapterV2 detects the missing-session error and records the native thread ID. Finalized threads with a recorded ID receive `error` status.
Reject resumes of lost sessions `apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.ts`, `apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.ts`	`resumeThread` rejects recorded lost native thread IDs with a protocol error. The regression test checks the failed turn, error status, and resume rejection in the current and a new provider session.

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

Change: Bug fix · Severity of issue fixed: Medium

Possibly related issues

pingdotgg/t3code#15854 — The changes handle resume attempts after the CLI reports a missing Claude conversation, but do not establish the issue’s startup-interruption behavior.

Suggested reviewers: t3dotgg

Merge Risk: External image Minimal · up to 01aab

A missing Claude conversation can recover on the next send. The failed turn still shows an error, but no actionable merge-blocking issue remains.

Pre-merge checks: ^Passed 3 · ^Failed 1

^Failed Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Out of Scope Changes check	Warning	The changes since the previous reviewed head add features unrelated to [`#31689`]. They include Claude prompt suggestions, MCP elicitation session grants, dynamic model-catalog and executed-model handli…	Remove the unrelated feature and test changes from this pull request. Keep the missing-session recovery changes and the regression-test updates needed for that behavior.

^Passed Passed checks: 3 passed

Check name	Status	Explanation
Title check	Passed	The title clearly summarizes the main change: Claude threads recover on the next send after their native session is gone.
Description check	Passed	The description covers the problem, change, linked issue, and focused verification. The scope section identifies automated triage but does not include an explicit maintainer approval comment or explai…
Linked Issues check	Passed	[`#31689`] The adapter remembers a native session ID after the CLI reports that the conversation is missing, marks the provider thread as `error`, and rejects later resumes. The existing resume fallback…

Full details: Description check

Explanation

The description covers the problem, change, linked issue, and focused verification. The scope section identifies automated triage but does not include an explicit maintainer approval comment or explain why the fix qualifies without one.

Full details: Linked Issues check

Explanation

[#31689] The adapter remembers a native session ID after the CLI reports that the conversation is missing, marks the provider thread as error, and rejects later resumes. The existing resume fallback can then start a fresh native session with a summary handoff. The updated regression test makes the fake CLI return the missing-conversation result after it receives the prompt. The reported restart window can require one additional failed turn, but it does not leave the thread permanently unusable.

Full details: Out of Scope Changes check

Explanation

The changes since the previous reviewed head add features unrelated to [#31689]. They include Claude prompt suggestions, MCP elicitation session grants, dynamic model-catalog and executed-model handling, auto-compact settings resolution, and background-task metadata changes in ClaudeAdapterV2.ts, with corresponding tests. These changes do not implement or test recovery from a missing native session.

Resolution

Remove the unrelated feature and test changes from this pull request. Keep the missing-session recovery changes and the regression-test updates needed for that behavior.

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Added 2 commits2d ago

Merge remote-tracking branch 'origin/main' into fix/issue-3168934126d6
test(server): lost Claude conversation fake answers only after the prompt01aabda

MmacroscopeappBotapproved these changes2d ago

CcoderabbitaiBotreviewed2d ago

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6	Failed pre-merge checks:
7	- Out of Scope Changes check:
8	Remove the unrelated feature and test changes from this pull request. Keep the
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10	behavior.
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Repository: pingdotgg/t3code
Branch: fix/issue-31689
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`apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.ts`
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JJulius Marminge2d ago

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: start a Claude thread and ask it to remember MARIGOLD-OTTER; confirm its answer; stop the server; rename that synthetic session's transcript out of its native location while retaining the database; restart; ask for the word; send the same question again without restarting; restart again and repeat the question. Both commits failed the first post-removal send, recovered MARIGOLD-OTTER on the next send using a replacement native session, and resumed that replacement successfully after restart.

It stays open for a person to finish or close.