Best possible solution:

Land the focused recorder-tail fix after normal maintainer review; the linked bug can close after this PR merges.

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

Yes. Current main source parses every non-empty active recorder fragment, and the linked issue plus PR tests provide a concrete split-write/reset path that reaches the reported JSON.parse failure.

Is this the best way to solve the issue?

Yes. Using newline as the live completed-record boundary while keeping final cleanup strict is narrower and safer than catching or ignoring JSON.parse failures broadly.

AGENTS.md: found and applied where relevant.

Codex review notes: model internal, reasoning high; reviewed against 525c4c7ce1b8.

Label changes:

• add rating: 🐚 platinum hermit: Overall readiness is 🐚 platinum hermit; proof is 🐚 platinum hermit and patch quality is 🦞 diamond lobster.
• remove rating: 🦐 gold shrimp: Current PR rating is rating: 🐚 platinum hermit, so this older rating label is no longer current.

Label justifications:

• P2: The PR fixes an intermittent QA Lab Crabline smoke failure with limited product-runtime blast radius.
• rating: 🐚 platinum hermit: Overall readiness is 🐚 platinum hermit; proof is 🐚 platinum hermit and patch quality is 🦞 diamond lobster.
• status: 👀 ready for maintainer look: ClawSweeper has no concrete contributor-facing blocker left for this PR. Sufficient (terminal): The PR body includes focused terminal/Testbox evidence, and live PR-head CI shows QA Smoke CI and relevant checks passing for the reviewed head.
• proof: sufficient: Contributor real behavior proof is sufficient. The PR body includes focused terminal/Testbox evidence, and live PR-head CI shows QA Smoke CI and relevant checks passing for the reviewed head.

PR surface:

Source +15, Tests +77. Total +92 across 2 files.

What I checked:

• Repository policy read: Root AGENTS.md and the scoped extensions guide were read fully; their deep-review, protected maintainer-label, extension-boundary, and dependency-contract guidance shaped this review. (AGENTS.md:36, 525c4c7ce1b8)
• Current-main failure path: Current main still splits every non-empty recorder fragment and passes each new fragment to JSON.parse, so a read ending inside the active final row can throw before Crabline appends the newline. (extensions/qa-lab/src/crabline-transport.ts:233, 525c4c7ce1b8)
• PR line policy: PR head adds readRecorderLines, which drops only a non-newline-terminated tail when incomplete tails are allowed and leaves newline-terminated malformed rows visible to JSON.parse. (extensions/qa-lab/src/crabline-transport.ts:55, d3d41d487bf1)
• Strict final validation: PR head closes the adapter, waits for any in-flight sync, then performs a strict recorder snapshot so a permanently truncated final tail still fails instead of being silently ignored. (extensions/qa-lab/src/crabline-transport.ts:326, d3d41d487bf1)
• Regression coverage: PR head adds focused tests for deferring a split JSONL tail, rejecting a newline-terminated malformed row, and rejecting a permanently truncated cleanup tail. (extensions/qa-lab/src/crabline-transport.test.ts:106, d3d41d487bf1)
• Crabline dependency contract: @openclaw/[email protected] server implementations append recorder events as JSON.stringify(event) plus a newline, matching the PR's newline-as-completed-record boundary. (@openclaw/[email protected]/dist/src/servers/telegram.js:117)

Likely related people:

• RomneyDa: GitHub history shows this account introduced the Crabline channel driver and made the latest substantive QA Lab Crabline transport/test changes before this PR. (role: feature owner and recent area contributor; confidence: high; commits: 63b13ea837fe, e701dc76b060, 8604dbdc93fb; files: extensions/qa-lab/src/crabline-transport.ts, extensions/qa-lab/src/crabline-transport.test.ts)
• vincentkoc: Recent commits on the same Crabline QA transport path adjusted scoped package integration and retained delivery targets. (role: adjacent area contributor; confidence: medium; commits: c313642ae271, 009d6b261aad; files: extensions/qa-lab/src/crabline-transport.ts, extensions/qa-lab/src/crabline-transport.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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