Best possible solution:

Land this Discord-boundary fix after current-head validation, keeping the shared reasoning formatter and marker-clearing behavior as the canonical path.

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

Yes, source-level: current main emits opted-in reasoning payloads but Discord suppresses payload.isReasoning before delivery. I did not run a live Discord reasoning-model session in this read-only review.

Is this the best way to solve the issue?

Yes, the latest PR head is at the right Discord delivery boundary: it removes the Discord-only drop guards, reuses the shared formatter, and clears the internal marker before durable outbound send. Current-head validation remains the main merge-readiness gap.

AGENTS.md: found and applied where relevant.

Codex review notes: model internal, reasoning high; reviewed against 38807ffba4b2.

Label changes:

• add rating: 🦐 gold shrimp: Overall readiness is 🦐 gold shrimp; proof is 🦐 gold shrimp and patch quality is 🐚 platinum hermit.
• add status: 👀 ready for maintainer look: ClawSweeper has no concrete contributor-facing blocker left for this PR. Not applicable: The external-contributor real-behavior proof gate does not apply to this maintainer-labeled PR; the body includes focused test claims but no inspected live Discord artifact.
• remove rating: 🧂 unranked krab: Current PR rating is rating: 🦐 gold shrimp, so this older rating label is no longer current.
• remove status: ⏳ waiting on author: Current PR status label is status: 👀 ready for maintainer look.

Label justifications:

• P2: This is a normal-priority Discord message-delivery bug fix with a narrow channel blast radius.
• merge-risk: 🚨 message-delivery: The diff changes whether and how Discord delivers isReasoning payloads, so mistakes could still suppress or misformat visible reasoning replies.
• rating: 🦐 gold shrimp: Overall readiness is 🦐 gold shrimp; proof is 🦐 gold shrimp and patch quality is 🐚 platinum hermit.
• status: 👀 ready for maintainer look: ClawSweeper has no concrete contributor-facing blocker left for this PR. Not applicable: The external-contributor real-behavior proof gate does not apply to this maintainer-labeled PR; the body includes focused test claims but no inspected live Discord artifact.

PR surface:

Source -12, Tests +20. Total +8 across 5 files.

What I checked:

• Repository policy read: The full root policy and scoped bundled-plugin policy were read; the review applied the whole-path PR review and extension boundary guidance. (AGENTS.md:1, 38807ffba4b2)
• Current main still drops Discord reasoning: Current main returns before Discord delivery when payload.isReasoning is true in both pre-delivery and delivery paths, matching the linked message-loss report. (extensions/discord/src/monitor/message-handler.process.ts:612, 38807ffba4b2)
• PR head removes the Discord drop guards: The PR head deletes both Discord payload.isReasoning early-return blocks and updates the handler tests from suppression to delivery expectations. (extensions/discord/src/monitor/message-handler.process.ts:606, 29f657d08519)
• PR head clears the marker before shared durable send: The latest patch imports formatReasoningMessage, maps sanitized Discord replies through a reasoning formatter, deletes isReasoning, and then calls sendDurableMessageBatch. (extensions/discord/src/monitor/reply-delivery.ts:156, 29f657d08519)
• Durable outbound requires marker clearing: Shared outbound planning suppresses payloads while isReasoning remains true, so the Discord delivery boundary must transform or clear the marker before durable delivery. (src/infra/outbound/payloads.ts:207, 38807ffba4b2)
• Shared visible-reasoning contract: formatReasoningMessage is the shared markdown-friendly formatter for visible reasoning and the docs specify enabled reasoning as a separate Thinking message. (src/agents/embedded-agent-utils.ts:177, 38807ffba4b2)

Likely related people:

• vincentkoc: Current blame ties the Discord reasoning suppression and shared formatter lines in this shallow checkout to Vincent Koc, and the current main head is also authored by Vincent Koc on nearby plugin surface work. (role: recent Discord and reasoning-path contributor; confidence: high; commits: ce7f899165, 38807ffba4b2; files: extensions/discord/src/monitor/message-handler.process.ts, extensions/discord/src/monitor/reply-delivery.ts, src/agents/embedded-agent-utils.ts)
• medns: Merged PR history shows medns authored the May 2026 refactor to preserve raw reasoning stream and push formatting to edge, which is the contract this PR now follows. (role: reasoning formatter/refactor author; confidence: medium; commits: b4d0c7b05d81; files: src/agents/embedded-agent-utils.ts, extensions/feishu/src/reply-dispatcher.ts, extensions/telegram/src/reasoning-lane-coordinator.ts)
• ubehera: Merged PR history shows ubehera authored recent Discord reply-delivery skip/logging changes in the same handler and adjacent tests. (role: recent Discord handler contributor; confidence: medium; commits: 267bf10f37a0, c40e34764d38; files: extensions/discord/src/monitor/message-handler.process.ts, extensions/discord/src/monitor/message-handler.process.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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