fix(server): preserve Codex titles on import

[debugrror]

Imported Codex sessions could be titled <recommended_plugins> or another injected context marker because onboarding derived the label from the first user-role transcript record.

This reads Codex canonical names from a size-bounded session_index.jsonl. When no saved name is available, title derivation skips leading Codex-only injected context while preserving the full imported history. Re-running import repairs known legacy placeholder titles from the canonical index or persisted imported messages without overwriting custom or concurrent manual renames. Repair failures do not interrupt transcript bookkeeping.

The session index is read through one bounded file handle, rejects concurrent growth, caps retained entries and title length, and retains the newest index records.

Tests:

• complete importer suite: 15 passed
• focused scanner title/index/context regressions: 14 passed
• server typecheck, focused lint, formatting, and diff checks pass
• combined scanner/importer run: 106 passed; one unrelated existing macOS symlink/worktree test fails

Closes #10513

Model: GPT-5.6 Sol (high)
Harness: T3 Code / Codex

[macroscopeapp]

Approvability

Verdict: Approved at dcfd375

Macroscope's review found this PR approvable — This is a focused Codex import bug fix that adds bounded title lookup, safe fallback derivation, and guarded repair of legacy placeholders. Changes are isolated to the scanner/importer paths and are covered by targeted regression tests without schema, deployment, security, billing, or default-setting impact.

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

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Reviewing files that changed from the base of the PR and between dcfd375 and 87dcacc.

📒 Files selected for processing (4)

• apps/server/src/project/AgentSessionImporter.test.ts
• apps/server/src/project/AgentSessionImporter.ts
• apps/server/src/project/AgentSessionScanner.test.ts
• apps/server/src/project/AgentSessionScanner.ts

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📝 Walkthrough

Walkthrough

Codex imports now read canonical titles from session_index.jsonl, skip leading injected context when deriving fallback titles, and repair recognized legacy titles on already-imported threads. Repair failures do not stop import tracking.

Changes

Codex title handling

Layer / File(s)	Summary
Session-index discovery and metadata propagation apps/server/src/project/AgentSessionScanner.ts, apps/server/src/project/AgentSessionScanner.test.ts	The scanner reads bounded index contents, parses and limits entries, matches titles to Codex rollouts, and carries canonical titles through transcript metadata. Tests cover malformed entries, duplicate IDs, title limits, and index growth.
Imported title derivation apps/server/src/project/AgentSessionScanner.ts, apps/server/src/project/AgentSessionScanner.test.ts	Imported titles prefer canonical metadata, then use the first derived user-message title. Codex derivation skips recognized leading context; tests verify message preservation and unchanged Claude title handling.
Legacy imported title repair apps/server/src/project/AgentSessionImporter.ts, apps/server/src/project/AgentSessionImporter.test.ts	The importer repairs recognized legacy titles from canonical or derived titles, using expected title-state values. It leaves manual titles unchanged and continues import tracking if repair dispatch fails.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant AgentSessionScanner
  participant AgentSessionImporter
  participant TitleCommand
  participant ImportedThread
  AgentSessionScanner->>AgentSessionScanner: Read session_index.jsonl and derive fallback title
  AgentSessionScanner->>AgentSessionImporter: Provide canonicalTitle and transcript metadata
  AgentSessionImporter->>TitleCommand: Dispatch repair for recognized legacy title
  TitleCommand-->>AgentSessionImporter: Complete or report an invariant error
  AgentSessionImporter->>ImportedThread: Record imported transcript

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Suggested reviewers: juliusmarminge

Merge Risk: ⚪ Minimal · up to 87dca

Codex imports prefer saved titles and exclude injected context from fallback titles. Legacy-title repairs preserve manual renames and continue import bookkeeping on failure. No concrete merge-blocking risk remains identified; merge after normal checks.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 87dca

Title updates are bounded and guarded against overwriting manual renames. They do not replace conversation history or grant additional permissions. Remaining uncertainty concerns concurrent changes to import eligibility and behavior under production scheduling.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — An actor able to modify the configured Codex index can influence bounded title text for matching imported sessions. In the inspected flow, index entries do not select transcript paths, change workspace or session identity, replace provider bindings, or grant tool authority. The additional exposure is persisted display metadata, including eligible legacy-title repairs.

Trust Boundaries and Controls

• observed — The index reader uses one scoped file handle, rejects non-files and payloads exceeding 16 MiB, and probes one byte beyond the bound. Parsing validates string fields, limits processed records, prefers newer entries, and trims titles to at most 100 characters. Read failures fall back to transcript-derived title handling.

Resilience and Maintainability Implications

• observed — Queued command processing and transactional event/projection persistence contain the repair transition. Stale title/version results or concurrent manual renames produce no title replacement. The repair helper re-reads thread details but does not revalidate the initial project/runtime-binding eligibility; concurrent rebinding remains an unexercised eligibility race, not demonstrated authority expansion or history corruption.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 60.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: preserving Codex titles during server-side import.
Description check	✅ Passed	The description explains the problem, implementation, scope, linked issue, verification results, and agent details. It is mostly complete, although it does not use the template headings and does not e…
Linked Issues check	✅ Passed	The changes satisfy the coding requirements in #10513. AgentSessionScanner.ts reads bounded session_index.jsonl data and uses the saved Codex title when available. The fallback title derivation sk…
Out of Scope Changes check	✅ Passed	The changes remain within the scope of #10513. Index parsing and fallback derivation implement the reported title behavior. Legacy-title repair addresses existing imports affected by the same bug. The…

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Actionable comments posted: 2

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Inline comments:
In `@apps/server/src/project/AgentSessionImporter.ts`:
- Around line 159-164: Update repairImportedCodexTitle to avoid overwriting a
user rename between reading the current title and dispatching
thread.meta.update: make the repair atomic, or require the title to still match
a legacy Codex context title when applying it. Preserve custom titles and only
set canonicalTitle when that precondition holds.
- Around line 237-245: Update the existing-binding import branch around
repairImportedCodexTitle so failures from Codex title repair are caught and
logged without aborting the thread import. Ensure recordImportedTranscript still
runs and the branch returns true after the repair attempt, while preserving the
current behavior for non-Codex threads.

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📒 Files selected for processing (4)

• apps/server/src/project/AgentSessionImporter.test.ts
• apps/server/src/project/AgentSessionImporter.ts
• apps/server/src/project/AgentSessionScanner.test.ts
• apps/server/src/project/AgentSessionScanner.ts

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[juliusmarminge]

Thanks for working on this. We merged the orchestrator V2 rewrite in #2829, and we are closing this PR as part of that transition.

The patch conflicts with the rewrite in apps/server/src/project/AgentSessionImporter.ts. Even where the conflict is small enough to rebase, we are asking for fresh PRs against the new base so we can review and verify the behavior in V2.

Sorry for the extra work this creates. If the change is still needed on V2, please rebuild it on current main, verify it there, and open a new PR linking back here. We're closing the current implementation without assuming the underlying request is resolved.