[Mikerpen22]

Long Claude sessions can be skipped during import because tool-only, attachment, and hidden records exhaust the 32 MiB selected-history budget, even when their visible conversation fits. Retain only visible Claude user/assistant records and fold the latest nonhidden session ID, title, and model separately. Capture the first cwd before filtering so workspace matching still works when the cwd comes from a discarded record. Codex retention and the existing import limits remain unchanged.

Maintainer takeover of @Mikerpen22’s #19161, preserving the contributor’s commits and merging main. Reduced four added tests to two (211 → 123 added test lines), combining metadata and cwd preservation into the long tool-history regression. Removed duplicate text construction during retention and kept the existing Codex retention rules.

Verification on headless Linux:

• Against main’s production scanner: 82 existing tests pass and both new regressions fail because the transcript is skipped. Against the rebuilt scanner: all 84 pass. The cases use the real budget, 20,000 tool-result records, and 21 one-MiB hidden records; they also verify metadata precedence, hidden metadata exclusion, first-cwd precedence, and visible message order.

• All 97 focused scanner, JSON-reader, and importer tests pass. Scoped lint/formatting and server typecheck pass; the typecheck reports 154 existing Effect suggestions.

• A standalone headless run connects the real scanner and importer to isolated filesystem data, a captured event sink, and an in-memory runtime repository. A 20,005-record synthetic Claude transcript imports one thread with its visible messages, title, model, and native resume binding:

  {"importedCount":1,"skippedCount":0,"messages":["First visible prompt","Visible final answer"],"eventCount":6,"resumeBound":true}

This keeps the existing 32 MiB selected-history and shared 100,000-record limits. A single record can still exceed the remaining selected allocation while decoding, including an ultimately discarded record, and reject the transcript. Visible history exceeding the budget is still rejected; this does not add a rolling window.

No UI layout, contract, or transport changes. The headless proof captures emitted events rather than persisting them to a real database. Web/desktop import UI, macOS, Windows, iOS, Android, and packaged Electron were not verified. The original author’s private-transcript and fuzz comparisons were not rerun.

Model/harness: GPT-6-Astra (tests), GPT-6.1-Sol (implementation/integration) through Codex; independent GPT-6-Sol and Claude Opus 5.5 reviews through Codex and Claude Code.

[macroscopeapp]

Approvability

Verdict: Would Approve

Macroscope's review found this PR approvable — This is a localized server bug fix that lets oversized Claude and Codex transcripts import within the existing memory bound, with focused coverage for both sources and no schema, deployment, security, billing, or default changes. An unresolved Medium finding notes that later Claude title records may be evicted, so title preservation remains a blocking correctness risk.

Not approved because:

• 1 blocking correctness issue found at or above your repo's Minimum Blocking Severity

^{Adjust the Minimum Blocking Severity for this repo — including turning it Off — in Settings. You can add or adjust custom eligibility rules. Learn more.}

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

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📝 Walkthrough

The scanner folds Claude session ID, title, and model values from decoded records. It excludes hidden records and records without visible conversation text from retained history. Recent-thread import uses the captured working directory and folded Claude fields.

Changes: Claude transcript import

Layer / File(s)	Summary
Classify messages and fold Claude fields apps/server/src/project/AgentSessionScanner.ts, apps/server/src/project/AgentSessionScanner.test.ts	The parser excludes hidden records from visible messages. It folds Claude session ID, title, and non-synthetic model values from decoded records. Tests cover hidden records and metadata on records without visible text.
Capture transcript fields and import visible history apps/server/src/project/AgentSessionScanner.ts, apps/server/src/project/AgentSessionScanner.test.ts	Transcript reading captures the first working directory and Claude fields from decoded records, while retaining visible user or assistant messages with text. Recent-thread import uses the captured values. Tests cover a long transcript with many tool-result records.

Priority: ⬇️ Low

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

Change: Bug fix

Suggested reviewers: juliusmarminge

Merge Risk: ⚪ Minimal · up to e6131

The import changes are ready to merge after normal checks. An individually oversized record can still cause an import to be skipped, but that behavior predates this PR.

Security architecture risk: 🔵 Low · up to e6131

The change allows previously skipped conversations to import while preserving workspace matching and session-ID validation. No newly introduced security failure was established, but interruption and concurrent-import recovery remain incompletely verified.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — A party able to alter an eligible transcript can influence imported conversation text, metadata and the future native resume binding for its provider instance. The PR admits additional large transcripts to this existing path, but the base already accepted metadata-controlled session identity from smaller transcripts. No new file-write capability or broader privilege is established.

Trust Boundaries and Controls

• observed — Transcript cwd remains a selection input, not runtime ownership authority: it must resolve to the requested workspace identity, and persisted runtime cwd comes from the project record. Claude session IDs must match the existing UUID pattern. Existing threads must belong to the requested project and retain the import history origin before their completion marker is accepted.

Resilience and Maintainability Implications

• inferred — The pre-existing import protocol writes runtime state, then transactional events and projections, then the completion marker. Existing-thread checks, deterministic identifiers and runtime insert-on-conflict-ignore provide retry controls, but end-to-end atomicity and concurrent or crash recovery remain incompletely verified. This is a coverage limitation, not an established PR-induced security concern.

Pre-merge checks: 4

Check name	Status	Explanation
Title check		The title is concise, uses the conventional commit format, and clearly identifies the main fix for importing long Claude sessions dominated by tool records.
Description check		The description clearly explains the problem, implementation, scope, verification results, limitations, and model/harness details. It does not include an explicit maintainer approval comment or separa…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Description check

Explanation

The description clearly explains the problem, implementation, scope, verification results, limitations, and model/harness details. It does not include an explicit maintainer approval comment or separate template headings, but the required information is mostly present.

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Actionable comments posted: 4

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Inline comments:
Review comments at @apps/server/src/project/AgentSessionScanner.ts:
- Line 524: Update both assistant-classification branches in the record
classifier to return “assistant” only when extracting the corresponding
assistant content yields nonempty text; otherwise return null. This ensures
empty or tool-only records do not mark openingComplete before a visible
assistant reply.
- Line 895: Update the record-retention logic around `MutableList.append` so the
first record containing cwd metadata is preserved outside the evictable `recent`
window, even when it follows the opening reply. Ensure `prepareRecentThreads`
can still find that cwd after later history exceeds the budget, while leaving
ordinary recent-record eviction unchanged.
- Around line 894-895: Update the recent-record selection in AgentSessionScanner
so Claude sidechain, meta, and compact-summary user or assistant records ignored
by the message parser do not consume the recent-message budget or evict visible
history. Filter them before appending to recent, while preserving any metadata
the import needs through a separate path.
- Around line 874-880: Update the history-budget handling in `reserve` so an
oversized record after the opening is discarded and scanning continues to
subsequent records, rather than throwing after evicting `recent`. Reject the
transcript only when the opening itself cannot fit; preserve the existing limit
behavior for that case.

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

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[juliusmarminge]

Taking over this one as maintainer for batch claude-11. I will preserve the original commits, integrate main, reduce the tests, and rebuild selective transcript retention while checking metadata and workspace matching. Thanks @Mikerpen22 for the reproduction and real-transcript comparison.

[Mikerpen22]

Thanks @juliusmarminge for taking this over and rebuilding the retention, much appreciated. Happy to re-test against my long transcripts if useful.