[kilhyeonjun]

Summary

#477's "keeps a task's title when the newest page moves past the turn that started it, while the file is watched" fails on macOS. On Linux CI it passes, but only by accident, so the feature it describes never worked.

liveTurns passes titles on from an earlier page only when that page ended at or before the new page start (kept.end <= start). The page that held the spawning turn always runs past that start: it is extended to the newest turn start on every poll. So nothing was ever passed on.

On Linux the test passed anyway because of the test that runs before it. That test writes a file starting with the same two lines, the "start it" prompt and the "Survey the repo" spawn of st_1, and its settled page ends exactly where this test's second turn begins. afterEach deletes the file, and ext4/tmpfs hands its inode to the next temp file, so the stream id (dev-ino) matches. The filter looked across all paths, so it took that dead file's titles. APFS does not reuse inodes, which is why macOS failed the test.

The same cross-path lookup is also a real bug on Linux. A transcript that takes over a deleted one's inode can inherit that transcript's titles for task ids it shares. OmO ids like st_1 repeat across sessions.

Change

• A new page takes the nearest earlier page of the same file (settled keys are path\0start). If that page ran past the new start, its turns before the start are parsed again, starting from the titles that page itself began with (inherited). That is usually one turn, since the page moves one prompt at a time. If the earlier page ended at or before the start, its titles are used as before.
• Pages of other paths no longer count.

Tests

• The existing test now tests what it says on every OS. A new helper pollPastFirstTurn is shared by both tests.
• New test "never titles a task from another file that had the same inode". It uses a hard link rewritten in place to reproduce Linux inode reuse on any system: a file that takes over another's inode must title st_1 as a cold read does (explore).
• On the old code, both tests fail on macOS. On the new code both pass, and the full unit suite passes on macOS: 1386 pass, 0 fail (bun scripts/ci-tests.ts unit, Bun 1.4.2).
• bun run typecheck passes.

🤖 Assisted by kilhyeonjun-harness

Maintainer review

A further regression now covers a whole page of prompts arriving between polls. Titles from the last observed live turn are preserved too; replay is bounded to bytes already observed, rather than scanning all skipped history. Transcript-page tests clear module caches between cases. All 48 conversation tests and the complete macOS unit suite pass (1,402 pass, 24 skipped), along with typecheck.

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• CHANGELOG.md

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📝 Summary

Summary by CodeRabbit

• Bug Fixes
  • Fixed an issue where an OmO pane could lose a background task’s title as the conversation continued beyond the prompt that started it, keeping the task identifiable as newer conversation activity appeared.
  • Prevented task titles from carrying over between separate sessions, so each pane continues to show the title for its own background task.

Walkthrough

Page initialization carries task titles from the nearest earlier page for the same transcript path and stream. Tests cover title retention as pages advance and isolation when a different path reuses a file identity.

Changes

OmO task-title retention

Layer / File(s)	Summary
Page title inheritance and regression coverage server/conversation.ts, server/conversation.test.ts, CHANGELOG.md	Settled pages store inherited task titles separately from page-specific titles. New pages use the nearest earlier page for the same path and stream, and reparse transcript bytes when that page overlaps the new start. Tests cover title retention and isolation across paths. The changelog records the fix.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~12 minutes

Change: Bug fix · Severity of issue fixed: Low

Merge Risk: ⚪ Minimal · up to 982e2

The change fixes OmO task titles not carrying forward across transcript pages, with a changelog entry and reported passing tests. No actionable merge-blocking risk was found in the supplied context.

Security Architecture Review

Security architecture risk: 🔵 Low · up to b1fa0

The change keeps task titles tied to their original transcript without adding endpoints or permissions. No new security issue was established, but unusual file rewrites and very long sessions retain limited assurance.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The demonstrated external effect is a task title in an existing conversation response. The changed logic narrows its source to the requested transcript path and stream; the inspected call chain shows no added command execution, credential use, or cross-service propagation.

Security Findings and Attack Paths

• observed — The base allowed a settled page from another path with the same stream ID to supply titles for repeated task IDs. The head adds an exact path-prefix check, removing that selection path. The hard-link regression asserts that the second path does not receive the first path's task title.

Trust Boundaries and Controls

• observed — Inheritance requires matching path and stream identity. Existing controls change identity on observed rewrites and native history clears, validate cursor identity and range, and convert page-read failures into an unavailable response. These controls were not weakened by the PR.

Resilience and Maintainability Implications

• observed — The existing rewrite detector does not assign a new generation solely because a file grows, and cached-page validation checks a bounded tail rather than all prior bytes. A larger in-place rewrite preserving those checked bytes can therefore escape these checks. The same limitation exists in the base; supported-writer behavior for that case was not established.

Hardening Proposals

• proposed — Consider an explicit entry or byte budget for inherited task titles, with a documented fallback when titles expire. The outer page cache is bounded, but title maps have no explicit per-map retention limit. This is a resource-containment proposal, not a verified denial-of-service finding.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 2 files. (1 skipped: 1 …
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 describes the primary change: retaining an OmO task’s title after its transcript page moves past the spawning prompt.
Description check	✅ Passed	The description explains the problem, the behavior change, and the relevant tests and results. It uses a "Change" section and provides validation details under "Tests" and "Maintainer review" instead …

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Actionable comments posted: 1

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Inline comments:
Review comments at @CHANGELOG.md:
- Line 14: Update the changelog entry about transcript titles naming another
session’s tasks to end with the full link to PR #498, adding the outside
contributor’s `by @login` attribution after the link when applicable.

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• CHANGELOG.md
• server/conversation.test.ts
• server/conversation.ts

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[devswha]

Reviewed the nearest-earlier-page selection, same-path filtering and inherited title map. The change preserves titles when the page overlaps the new start while refusing another path that reuses the inode. Added cache cleanup between transcript-page tests so earlier cases cannot make the regressions pass accidentally. All 47 conversation tests pass; the full macOS unit suite passes (1,401 passed, 24 skipped), as do typecheck, generated types and the build on Bun 1.4.2. No remaining blocking finding; merge remains gated by required CI.

[devswha]

Final review includes an additional reproduced polling-gap bug: if more than a page of prompts arrives between reads, the last previously observed live turn also has to contribute its task titles. The fix replays only the already observed bytes, preserving bounded reads even if a large amount of unseen history arrived meanwhile. The new regression fails without this fix. All 48 conversation tests, typecheck and the full macOS unit suite (1,402 pass, 24 skip, zero failures) pass. Cross-path inode isolation and cache cleanup between tests remain covered. No remaining blocking finding; required CI must pass for d28f92c.