Agent Loop Bug Caused Duplicate Webhook Writes Due to Truncated Tool Output

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A developer debugging a webhook worker discovered that an AI agent loop was triggering duplicate database inserts after receiving truncated tool output — a cut-off JSON response that lacked a closing brace. The agent, unable to confirm the first write had succeeded, reissued the mutating call, resulting in two records for the same delivery ID. Initial investigation wrongly blamed at-least-once message delivery, but raw payload logging revealed the real culprit was an incomplete receipt from the tool itself. The fix involved adding a strict parse-and-validate gate before any insert, requiring a fully formed JSON object with an explicit acknowledgment field before allowing the mutator to run. The experiment was conducted on a free remote server to avoid billing costs during overnight testing.

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