fix(server): let Claude abort turns before closing sessions

[Yash-Singh1]

What Changed

Claude now gets up to three seconds to abort an interrupted turn before the adapter closes its session. Tests cover both a successful abort and the timeout path.

Why

Closing the Claude process before it records the first turn can leave a resume cursor for a conversation that was never saved. Later messages then fail with "No conversation found." Letting Claude handle the interruption first gives it a chance to save the prompt.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Closes #2336

Summary by CodeRabbit

• Bug Fixes
  • Improved interrupted-turn handling: the session now waits briefly for Claude to finish gracefully before stopping. If the turn does not finish in time, the session is stopped and removed.

[macroscopeapp]

Approvability

Verdict: Approved at 2ed4f9f

Macroscope's review found this PR approvable — This focused server bug fix adds a bounded three-second graceful-interrupt window before Claude processes are closed, while retaining the existing timeout fallback. The production path is isolated and the new behavior has targeted tests for both successful interruption and timeout.

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[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	13.5 KiB	13.5 KiB	−11 B (−0.1%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.1 KiB	7.1 KiB	+5 B (+0.1%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.5 KiB	6.5 KiB	−16 B (−0.2%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	56.3 KiB	56.3 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	10	10	0 (0.0%)	21	✅
Claude	Total thread wire	13.5 KiB	13.5 KiB	+20 B (+0.1%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.1 KiB	7.1 KiB	+8 B (+0.1%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.4 KiB	6.4 KiB	+12 B (+0.2%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	57.0 KiB	57.0 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	9	9	0 (0.0%)	21	✅

Baseline: de251fc · PR result: 2ed4f9f · 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: 114.0 KiB
• Claude decoded thread snapshot: 114.7 KiB

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

[coderabbitai]

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📝 Walkthrough

Walkthrough

The Claude adapter now requests a graceful interruption of an active turn before stopping its session. It waits for turn completion for up to three seconds. Tests cover an aborted turn and a timeout.

Changes

Claude turn interruption

Layer / File(s)	Summary
Track turn settlement apps/server/src/provider/Layers/ClaudeAdapter.ts	The session context tracks a deferred for interrupt settlement. Turn completion resolves it.
Interrupt and stop the session apps/server/src/provider/Layers/ClaudeAdapter.ts, apps/server/src/provider/Layers/ClaudeAdapter.test.ts	interruptTurn invokes the SDK interrupt when available and waits up to three seconds before stopping the session. Tests cover an aborted result and a timeout that closes the query and removes the session.

Priority: ➖ Normal

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

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant ClaudeAdapter
  participant ClaudeSDKQuery
  Caller->>ClaudeAdapter: interruptTurn
  ClaudeAdapter->>ClaudeSDKQuery: interrupt active turn
  ClaudeSDKQuery->>ClaudeAdapter: aborted result
  ClaudeAdapter->>ClaudeAdapter: complete turn and resolve settlement
  ClaudeAdapter->>ClaudeAdapter: stop session after settlement or timeout

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Suggested reviewers: t3dotgg

Merge Risk: 🟡 Moderate · up to 2ed4f

Stopping a Claude turn now waits up to three seconds before closing the session. During that wait, a new message can be accepted and then silently dropped when the session closes. This should be addressed before merging.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
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.
Title check	✅ Passed	The title clearly and concisely describes the main change: allowing Claude to abort turns before the session closes.
Description check	✅ Passed	The description explains what changed, why the change is needed, and how tests cover the success and timeout paths. The checklist confirms the PR is focused and the change is not a UI change.

✨ Finishing Touches

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[coderabbitai]

Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @apps/server/src/provider/Layers/ClaudeAdapter.ts:
- Line 5289: Update the interruption flow around settleInterruptedTurn to mark
the session as stopping before waiting for Claude, and make sendTurn reject or
serialize new prompts while that interruption is pending. Preserve the existing
interruption handling once the wait completes.

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ℹ️ Review info

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Configuration used: Repository: pingdotgg/t3code/.coderabbit.yaml

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Run ID: 0d8449cd-f460-4488-acc6-711b0a9806ae

📥 Commits

Reviewing files that changed from the base of the PR and between de251fc and 2ed4f9f.

📒 Files selected for processing (2)

• apps/server/src/provider/Layers/ClaudeAdapter.test.ts
• apps/server/src/provider/Layers/ClaudeAdapter.ts

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