fix(server): OpenCode 2 continuations end after a reconnect took a Stop's end

[juliusmarminge]

Reported from a downstream V2 fork.

Problem

A Stop that times out marks the OpenCode session unsettled, so the stopped run's late end is skipped and doesn't finish the next turn. If the event stream drops before that end arrives, the reconnect finds the session idle but leaves the mark in place. When a background subagent then finishes, OpenCode starts a parent execution on its own. That execution's end is the one skipped as the old run's debris, so its continuation turn never ends and the thread keeps showing work. A user prompt clears the mark when it checks session.active. Continuations don't do that check (runWake comes first), so only wakes are affected.

Reproduction

New adapter replay test: ends a background reply's continuation after a lost stream took a Stop's end, in OpenCode2AdapterV2.test.ts. It uses the existing 2.0.18 frame shapes.

1. A turn starts a background subagent.
2. The restart interrupt hangs past its timeout, and the turn ends interrupted.
3. The next turn finds the parent still stopping and fails.
4. The stream drops, and the reconnect finds only the child running.
5. The child's report wakes the parent, and the continuation turn takes that execution.

On main the terminals are [interrupted, failed]: the continuation never ends. With the fix they are [interrupted, failed, completed].

The test gates two events with the shared ProviderReplayGate: the stream drop waits until the failed turn has checked the server, and the reply waits until the continuation took its wake. openCode2ReplayRuntime passes a gate through for this.

Fix

A session runs one execution at a time, and each one opens with session.execution.started on the ordered stream. Seeing a start therefore means the run the mark waits on is over: if its end hasn't arrived by then, it was lost with the dropped stream. handleEvent now clears unsettled on any execution start for a thread session. This happens before the event is held for a wake or routed, so the new execution's own end finishes its turn.

A reconnect never replays an old started. The adapter resubscribes with a bare GET /api/event: no cursor or Last-Event-ID. 2.0.18's protocol describes that endpoint as "Volatile by contract: … events during disconnection are missed" (@opencode/protocol groups/event.js). A live 2.0.18 probe agreed: a second subscription opened mid-execution received server.connected, then only the run's later events through session.execution.succeeded, and no session.execution.started.

A prompt whose request failed may start its run only after its turn has failed. That start is the run's own, so it mustn't clear the mark. The mark therefore records whether its run had already started when it was marked (unsettledStarted, from busy):

• A run that hadn't started only records its own late start, and the mark stays.
• Only a start after that clears the mark.
• A reconnect that finds the session idle counts the marked run as started, because by then it's over. A session still active may not have started that run yet, so its next start may still be its own; the run's end clears the mark. reconcile runs whenever a mark is pending.

A prompt rejected without a clear error marks the session too, even when OpenCode never took it. A background reply that starts after that would look like the failed prompt's late start, and its end would be skipped, so its continuation never ended. The continuation turn therefore clears the mark when it takes a reply that is still running: the run the mark waits on is that reply, or was over before it started. A reply that already ended replays without the skip, since its end is its own.

A genuinely late end still gets skipped. If the old run's end arrives before any new start, the mark is still set and consumes it, as before. The existing never lets a timed-out Stop's late end finish the next turn test covers this and still passes.

Verification

• still checks the server when a failed prompt's execution starts late: a 502 prompt whose execution starts late still makes the next turn check session.active. It fails on this PR's first commit and passes now.
• still checks the server when a failed prompt starts after a reconnect: the same, with a reconnect that finds the session active before the late start. It fails without the last commit (expected session.active, actual session.prompt) and passes now.
• ends a background reply's continuation after a prompt failed unclearly and its finished variant (the reply ends before its continuation takes it) time out without the last commit, and each needs its half of that fix. They pass now.
• ends a background reply's continuation after a lost stream took a Stop's end fails on main's adapter (actual: [ 'interrupted', 'failed' ]) and passes with the fix.
• vp test run inside unshare -U --map-current-user -p -f --mount-proc:
  • OpenCode2AdapterV2.test.ts + ProviderContinuationService.test.ts: 106/106 (adapter file 88/88).
  • testkit/OrchestratorReplayFixtures.integration.test.ts -t opencode2: 16/16.
• A live OpenCode 2.0.18 probe of resubscribing mid-execution (above).
• vp exec tsc --noEmit -p . in apps/server: exit 0.
• vp lint and vp fmt --check on the touched files: clean.
• Not run: the full scenario live. A dropped stream during a timed-out Stop can't be produced on demand.

Model: Claude Opus 5.5 (Claude Code)

🤖 Generated with Claude Code

[macroscopeapp]

Approvability

Verdict: Approved at 3e33a21

Macroscope's review found this PR approvable — This is a focused OpenCode 2 adapter bug fix that corrects continuation completion after late execution starts and reconnects. Production changes are confined to existing execution-state handling, with targeted tests covering reconnect, late-start, and background-reply scenarios.

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

[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	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	20.9 KiB	20.9 KiB	0 B (0.0%)	29.3 KiB	✅
Codex	Live turn messages	2	2	0 (0.0%)	8	✅
Claude	Total thread wire	5.0 KiB	5.0 KiB	+24 B (+0.5%)	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	+24 B (+2.0%)	2.0 KiB	✅
Claude	Live turn WebSocket decoded	21.2 KiB	21.2 KiB	+41 B (+0.2%)	29.3 KiB	✅
Claude	Live turn messages	1	2	+1 (+100.0%)	8	✅

Baseline: 716357c · PR result: 3e33a21 · 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.

Dismissing prior approval to re-evaluate 61b9521

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• apps/server/src/orchestration-v2/Adapters/OpenCode2AdapterV2.test.ts
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📝 Walkthrough

📝 Walkthrough

Walkthrough

The adapter now records whether an unsettled execution has started. Execution-start events and reconnect reconciliation update this state. Replay helpers accept an optional provider replay gate. Regression tests cover late starts, reconnects, and background replies with continuations.

Changes

OpenCode 2 unsettled execution tracking

Layer / File(s)	Summary
Track unsettled execution state apps/server/src/orchestration-v2/Adapters/OpenCode2AdapterV2.ts	Thread state records whether an unsettled run had started. Paths that mark runs unsettled now use markUnsettled to record whether the session is busy.
Reconcile execution starts and replay apps/server/src/orchestration-v2/Adapters/OpenCode2AdapterV2.ts	Execution-start events and reconnect reconciliation update unsettled-run state. Held wake replay does not consume the stale-run marker, and a continuation clears it when taking a running wake.
Test late starts and continuation outcomes apps/server/src/orchestration-v2/Adapters/OpenCode2AdapterV2.test.ts, apps/server/src/orchestration-v2/Adapters/OpenCode2AdapterV2.testkit.ts	Replay helpers accept and forward an optional replay gate. Tests cover failed prompts followed by late starts, reconnects, background replies, and continuation timing.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Suggested reviewers: esthor

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Merge Risk: 🟡 Moderate · up to 1dddc

An earlier prompt can still be running when a later prompt is submitted after reconnect, risking incorrect turn handling. Resolve this late-start path before merging.

🚥 Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description clearly explains the problem, fix, reproduction, and verification. It does not address the required scope and approval section: it provides no link to a triaged issue or maintainer app…	Add a link to the triaged issue or discussion with the maintainer's explicit approval of the direction and scope. If this is a small, focused fix of an obvious bug that needs no prior approval, state why it qualifies.

✅ Passed checks (3 passed)

Check name	Status	Explanation
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 summarizes the main change: fixing OpenCode 2 continuations that remain unfinished after a reconnect.

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The description clearly explains the problem, fix, reproduction, and verification. It does not address the required scope and approval section: it provides no link to a triaged issue or maintainer approval, and does not explain why this focused fix qualifies without prior approval.

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