Best possible solution:

Merge the plugin-local byte-buffer implementation and regression test so the existing diagnostic contract is enforced in raw bytes while always emitting valid UTF-8.

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

Yes, from current-main source with high confidence: the existing path truncates decoded string units rather than raw stderr bytes, so multibyte diagnostics can violate the stated byte limit. The regression test and direct Node decoder probe verify the relevant boundary behavior.

Is this the best way to solve the issue?

Yes. Bounding raw stderr at the owning ffmpeg child-process boundary is the narrowest maintainable fix, preserves existing playback and error propagation, and avoids introducing a second sanitization path.

AGENTS.md: found and applied where relevant.

Codex review notes: model internal, reasoning high; reviewed against 107b95e1ad89.

Label justifications:

• P2: The PR fixes a real but limited Discord voice failure-diagnostic bug without changing successful playback, configuration, or channel routing.
• rating: 🦞 diamond lobster: Overall readiness is 🦞 diamond lobster; proof is 🦞 diamond lobster and patch quality is 🦞 diamond lobster.
• status: 👀 ready for maintainer look: ClawSweeper has no concrete contributor-facing blocker left for this PR. Sufficient (live_output): The exact-head PR body provides after-fix output from a real failing ffmpeg process showing 24,377 stderr bytes bounded to 8,192 retained bytes and decoded without replacement characters.
• proof: sufficient: Contributor real behavior proof is sufficient. The exact-head PR body provides after-fix output from a real failing ffmpeg process showing 24,377 stderr bytes bounded to 8,192 retained bytes and decoded without replacement characters.

PR surface:

Source +3, Tests +20. Total +23 across 2 files.

What I checked:

• Current-main defect: Current main decodes stderr to JavaScript strings and truncates by string length under the byte-named limit, allowing multibyte UTF-8 diagnostics to exceed 8,192 raw bytes. (extensions/discord/src/voice/audio.ts:119, 107b95e1ad89)
• Exact-head implementation: The PR head replaces string slicing with a fixed 8,192-byte buffer and uses StringDecoder to omit an incomplete trailing UTF-8 sequence without producing U+FFFD. (extensions/discord/src/voice/audio.ts:112, 71fc6655daae)
• Regression coverage: The added test splits a four-byte character at the cap and verifies the emitted diagnostic remains within the byte limit and contains no replacement character. (extensions/discord/src/voice/audio.test.ts:137, 71fc6655daae)
• Real behavior proof: The updated PR body records an actual failing ffmpeg process producing 24,377 stderr bytes, with the patched path retaining 8,192 bytes and decoding a replacement-free multibyte diagnostic. (71fc6655daae)
• Node decoder contract: A direct Node 24 StringDecoder probe with the same split boundary emitted only the complete UTF-8 prefix and no replacement character.
• Owner boundary: Both streaming and file-based Discord voice playback call this plugin-owned ffmpeg stream helper, so the patch enforces the invariant at the single owning boundary. (extensions/discord/src/voice/segment.ts:174, 107b95e1ad89)

Likely related people:

• vincentkoc: Git history and GitHub commit metadata attribute the current Discord voice playback helper, its callers, and the original stderr cap to this contributor's merged commit. (role: introduced current behavior; confidence: high; commits: ccab708c1633; files: extensions/discord/src/voice/audio.ts, extensions/discord/src/voice/segment.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 2026-07-11T06:55:48.263Z sha 4bdf5b0 :: needs real behavior proof before merge. :: none