Best possible solution:

Land the metadata-only Slack verbose log after redacted real Slack ingress proof shows the runtime log is content-free and maintainer handling clears the protected-label flow.

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

Yes. Source inspection on current main shows Slack rawBody becomes preview and logVerbose emits it when verbose/debug logging is enabled; rawBody is built from user message and attachment content.

Is this the best way to solve the issue?

Yes. The patch is the narrow owner-boundary fix: it keeps preview for the prepared message result while replacing only the verbose log sink with metadata and focused coverage.

AGENTS.md: found and applied where relevant.

Codex review notes: model internal, reasoning high; reviewed against c78b0d59f5a2.

Label justifications:

• P2: This is a focused Slack privacy hardening fix with limited runtime blast radius and no message-delivery behavior change.
• rating: 🧂 unranked krab: Overall readiness is 🧂 unranked krab; proof is 🧂 unranked krab and patch quality is 🦞 diamond lobster.
• status: 📣 needs proof: The PR needs real behavior proof before ClawSweeper can clear the contributor ask. Needs real behavior proof before merge: Tests, CI/Testbox claims, and an audit are present, but no redacted real Slack ingress or runtime log output demonstrates the after-fix metadata-only behavior. After adding proof, update the PR body; ClawSweeper should re-review automatically. If it does not, the PR author or someone with repository write access can comment @clawsweeper re-review.

PR surface:

Source +2, Tests +38. Total +40 across 2 files.

What I checked:

• Repository policy read: Root AGENTS.md and scoped extensions/AGENTS.md were read fully; their deep-review, extension-boundary, protected-label, and real-behavior-proof guidance applies here. (AGENTS.md:1, c78b0d59f5a2)
• Current main still logs preview content: Current main builds preview from rawBody and emits it in the slack inbound: verbose log line. (extensions/slack/src/monitor/message-handler/prepare.ts:1390, c78b0d59f5a2)
• Raw body can contain user content: rawBody is assembled from rendered Slack message text, attachment text, bot attachment text, media placeholders, and file placeholders. (extensions/slack/src/monitor/message-handler/prepare-content.ts:400, c78b0d59f5a2)
• Verbose logging is a runtime sink: shouldLogVerbose is true for verbose mode or debug file logging, and logVerbose writes debug logger entries plus console output in verbose mode. (src/globals.ts:7, c78b0d59f5a2)
• PR head changes the sink to metadata only: The PR head replaces the preview-bearing slack inbound: line with account, agent, channel, message/thread IDs, sender route, chat type, and character count. (extensions/slack/src/monitor/message-handler/prepare.ts:1390, 47d039f9a0fe)
• Regression coverage checks absence of content: The added test enables verbose logging, prepares a Slack DM, asserts the exact metadata-only inbound line, and checks the confidential body and preview= are absent. (extensions/slack/src/monitor/message-handler/prepare.test.ts:190, 47d039f9a0fe)

Likely related people:

• steipete: Recent merged Slack prepare-path refactor work touched the same runtime file, and this live PR is assigned to the same human account under the maintainer flow. (role: recent area contributor; confidence: high; commits: 1507a9701b83; files: extensions/slack/src/monitor/message-handler/prepare.ts)
• hugenshen: Authored the merged system-event preview cleanup that touched the same Slack prepare source/test surface and the same inbound-preview privacy theme. (role: adjacent preview-cleanup contributor; confidence: medium; commits: 47545e04c4bd; files: extensions/slack/src/monitor/message-handler/prepare.ts, extensions/slack/src/monitor/message-handler/prepare.test.ts)
• sjf-oa: Recent merged Slack relay-mode work touched prepare.ts, so this person is a plausible adjacent reviewer for inbound prepare-path behavior. (role: recent adjacent Slack contributor; confidence: medium; commits: 6fa944e80f22; files: extensions/slack/src/monitor/message-handler/prepare.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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• reviewed 2026-06-24T14:36:47.815Z sha 06bf20d :: needs real behavior proof before merge. :: none