Best possible solution:

Land the one-line sanitizer truncation fix after contributor proof or maintainer override, ideally with a focused surrogate-boundary sanitizer regression test.

Do we have a high-confidence way to reproduce the issue?

Yes from source: on current main, sanitizeForMemoryCapture pre-truncates long input with raw slice, so an emoji crossing the 10,000-code-unit boundary can leave a dangling surrogate. I did not execute a runtime repro because this review is read-only.

Is this the best way to solve the issue?

Yes: using the already imported truncateUtf16Safe at the missed sanitizer pre-truncation site is the narrowest maintainable fix. A broader refactor is unnecessary because the shared helper already owns the surrogate-safe contract.

AGENTS.md: found and applied where relevant.

Codex review notes: model internal, reasoning high; reviewed against f786efddcd88.

Label changes:

• add P2: This is a narrow correctness bug in a bundled memory plugin sanitizer with limited blast radius and no evidence of a live urgent regression.
• add rating: 🦪 silver shellfish: Overall readiness is 🦪 silver shellfish; proof is 🧂 unranked krab and patch quality is 🐚 platinum hermit.
• add status: 📣 needs proof: The PR needs real behavior proof before ClawSweeper can clear the contributor ask. Needs real behavior proof before merge: The PR body has only mechanical rationale and no after-fix live output/logs; please add redacted terminal output or a reproducible run showing the sanitizer result, then update the PR body to trigger re-review.

Label justifications:

• P2: This is a narrow correctness bug in a bundled memory plugin sanitizer with limited blast radius and no evidence of a live urgent regression.
• rating: 🦪 silver shellfish: Overall readiness is 🦪 silver shellfish; proof is 🧂 unranked krab and patch quality is 🐚 platinum hermit.
• status: 📣 needs proof: The PR needs real behavior proof before ClawSweeper can clear the contributor ask. Needs real behavior proof before merge: The PR body has only mechanical rationale and no after-fix live output/logs; please add redacted terminal output or a reproducible run showing the sanitizer result, then update the PR body to trigger re-review.

PR surface:

Source 0. Total 0 across 1 file.

What I checked:

• PR diff: The branch changes only the sanitize pre-truncation expression from text.slice(0, MAX_SANITIZE_CHARS) to truncateUtf16Safe(text, MAX_SANITIZE_CHARS). (extensions/memory-lancedb/index.ts:1168, 0fa3981678ed)
• Current main behavior: Current main still pre-truncates sanitizer input with raw text.slice(0, MAX_SANITIZE_CHARS), so the central change is not already implemented on main. (extensions/memory-lancedb/index.ts:1171, f786efddcd88)
• Runtime entry point: Auto-capture calls sanitizeForMemoryCapture(text) before shouldCapture, embedding, and storage, so the sanitizer output can become persisted memory text. (extensions/memory-lancedb/index.ts:1948, f786efddcd88)
• Helper contract: truncateUtf16Safe floors the limit and delegates to sliceUtf16Safe, which adjusts the end index away from a high-surrogate/low-surrogate split. (packages/normalization-core/src/utf16-slice.ts:43, f786efddcd88)
• Adjacent tests: The sanitizer already has a large-input pre-truncation test, but it only asserts length and does not cover an emoji/surrogate boundary case. (extensions/memory-lancedb/index.test.ts:3496, f786efddcd88)
• History provenance: Blame ties the current sanitize function and raw slice line to commit 0ac8933, authored and committed by vincentkoc. (extensions/memory-lancedb/index.ts:1171, 0ac8933721f7)

Likely related people:

• vincentkoc: Current main blame attributes the sanitize function, raw pre-truncation line, and adjacent tests to commit 0ac8933, and GitHub commit metadata maps the author/committer to vincentkoc. (role: recent area contributor; confidence: high; commits: 0ac8933721f7; files: extensions/memory-lancedb/index.ts, extensions/memory-lancedb/index.test.ts)
• amittell: A prior closed PR on the same memory-lancedb sanitizer surface describes adding sanitizeForMemoryCapture and extensive memory-lancedb sanitizer tests, making amittell relevant for domain context even though current main blame is on a later commit. (role: adjacent feature contributor; confidence: medium; commits: e47fcf4336a9; files: extensions/memory-lancedb/index.ts, extensions/memory-lancedb/index.test.ts)

• 🦀 challenger crab: rare, exceptional readiness with strong proof, clean implementation, and convincing validation.
• 🦞 diamond lobster: very strong readiness with only minor maintainer review expected.
• 🐚 platinum hermit: good normal PR, likely mergeable with ordinary maintainer review.
• 🦐 gold shrimp: useful signal, but proof or patch confidence is still limited.
• 🦪 silver shellfish: thin signal; proof, validation, or implementation needs work.
• 🧂 unranked krab: not merge-ready because proof is missing/unusable or there are serious correctness or safety concerns.
• 🌊 off-meta tidepool: rating does not apply to this item.

Shiny media proof means a screenshot, video, or linked artifact directly shows the changed behavior. Runtime, network, CSP, and security claims still need visible diagnostics.

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