fix(server): mark unvisited thread completions unread

[maria-rcks]

A thread started in the background could finish without ever showing an unread Done badge, because its read watermark was still null. The first fresh message now initializes that watermark one millisecond before dispatch, so the completion is unread on every client; opening the thread clears it, and untouched imported history stays read.

Closes #3131

The earlier Codex request-ordering and setup-worktree rename changes were dropped from this PR; the scoped server suites pass without them.

Verified on Blacksmith: 2009 orchestration-v2, MCP, and scheduling tests passed, including the focused watermark regression; server typecheck and scoped lint passed. Earlier: a real Codex completion in the web client, a full reload, and opening the thread.

Before: completed, never-opened thread has no Done badge.

After: a fresh completion shows Done; the older null-marker thread remains read.

Written by claude-opus-5-5 via Claude Code in T3 Code

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

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• Review profile: CHILL
• Plan: Advanced
• Run ID: 35067c5b-62fb-42c9-99ad-e6a9aa685d93

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📥 Commits

Reviewing files that changed from the base of the PR and between 17c0878 and 050e127.

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📒 Files selected for processing (5)

• apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.ts
• apps/server/src/orchestration-v2/Orchestrator.control-reads.test.ts
• apps/server/src/orchestration-v2/Orchestrator.ts
• apps/server/src/orchestration-v2/ThreadLaunchService.test.ts
• apps/server/src/orchestration-v2/ThreadLaunchService.ts

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📝 Walkthrough

Walkthrough

The orchestrator initializes a missing read watermark on a thread’s first non-maintenance dispatch. Codex request handlers reorder two emitted events. Branch-rename metadata updates include the expected worktree path, with tests covering these changes.

Changes

Read watermark initialization

Layer / File(s)	Summary
Initialize watermark on first conversation dispatch apps/server/src/orchestration-v2/Orchestrator.ts, apps/server/src/orchestration-v2/Orchestrator.control-reads.test.ts, apps/server/src/orchestration-v2/ThreadLaunchService.test.ts	A first non-maintenance dispatch sets a missing lastVisitedAt to one millisecond before the current time. Tests cover rejected and accepted dispatches, completion timestamps, retries, unread marking, explicit visit times, and thread launch state.

Codex request event ordering

Layer / File(s)	Summary
Order request events apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.ts	Eight request handlers now emit turn_item.updated before runtime_request.updated. Event payloads and other handler behavior remain unchanged.

Worktree branch rename metadata

Layer / File(s)	Summary
Constrain branch-rename metadata update apps/server/src/orchestration-v2/ThreadLaunchService.ts, apps/server/src/orchestration-v2/ThreadLaunchService.test.ts	The branch-rename metadata update includes expectedWorktreePath. The cancellation test delays branch-name generation and waits for the rename failure log or stored event before checking run and worktree state.

Priority: ➖ Normal

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

Change: Bug fix · Severity of issue fixed: Low

Suggested reviewers: juliusmarminge

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Merge Risk: ⚪ Minimal · up to 050e1

No actionable merge-blocking risk remains from the reviewed changes; merge after normal checks.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 050e1

The changes preserve existing operations and approval controls while improving event ordering and rejecting stale worktree updates. No privilege expansion was established, but some concurrent cancellation and recovery cases remain partially verified.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The assessed security-relevant scope is existing provider approval and input flows plus project worktree metadata. The changes do not establish a new external operation or credential authority. Broader tenant and deployment isolation were not established by the available evidence.

Trust Boundaries and Controls

• observed — The existing response control obtains request context using thread and request identity, rejects missing or non-pending requests, rejects non-resumable requests, and verifies the required live provider session exists. These preconditions are not removed by the event-order change.

Resilience and Maintainability Implications

• inferred — The expected-path precondition improves containment of stale metadata updates after cancellation, but it is not a generation check or an atomic transaction with Git. Physical renaming still precedes metadata dispatch. Same-path rebinding and reconciliation after rejection remain unresolved; this is bounded uncertainty, not evidence that the PR introduced a security failure.

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Pre-merge checks | 2 | 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Out of Scope Changes check		The CodexAdapterV2 changes reorder approval/input timeline updates and actionable requests. The ThreadLaunchService change guards against a late branch rename restoring a cancelled setup worktree. The…	Move the CodexAdapterV2 ordering changes and the ThreadLaunchService worktree guard to separately scoped changes, or link issues that require these behaviors.
Description check		The description explains the problem, intended behavior, linked issue, verification, and UI evidence. However, it does not use the required Problem, Change, Scope and approval, and Verification sectio…	Align the description with the actual diff. Add the required section headings, explain the scope and approval basis, and describe or remove the Codex ordering and worktree rename changes that remain in the pull request.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check		Issue #3131 requires newly started background threads to show unread completion while historical threads remain read. Orchestrator.dispatchMessage now writes a watermark one millisecond before the f…
Title check		The title clearly identifies the primary change: marking completions in previously unvisited threads as unread.

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Full details: Out of Scope Changes check

Explanation

The CodexAdapterV2 changes reorder approval/input timeline updates and actionable requests. The ThreadLaunchService change guards against a late branch rename restoring a cancelled setup worktree. These changes address approval ordering and setup cancellation, not issue #3131's unread completion status. The PR description connects them to races exposed during implementation, but it does not establish that they are needed for the linked issue.

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Full details: Description check

Explanation

The description explains the problem, intended behavior, linked issue, verification, and UI evidence. However, it does not use the required Problem, Change, Scope and approval, and Verification sections. It also states that Codex ordering and worktree rename changes were dropped, while the change summary shows those files still changed.

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[macroscopeapp]

Approvability

Verdict: Approved at 5551447

Macroscope's review found this PR approvable — This focused server bug fix adds a one-time unread watermark for fresh dispatches on never-visited threads while preserving existing maintenance and visited-thread behavior. The accompanying tests cover the new state transition and its exclusions.

Notes:

• Diff unchanged. Approvability was decided on eligibility alone.

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

Dismissing prior approval to re-evaluate 050e127

Dismissing prior approval to re-evaluate 5551447

Dismissing prior approval to re-evaluate 5551447