AI Merge Bot Approved Broken Code by Reading Agent Summary Instead of Actual Diff

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A merge gate designed to validate code changes failed by scoring an AI-generated transcript file rather than the actual patch diff or contract schema. The bot detected phrases like 'all tests passed' in a markdown summary and issued a passing verdict without ever examining the modified OpenAPI spec or git diff. As a result, a schema change that quietly made required fields optional slipped through, causing downstream clients to send incomplete payloads and corrupt stored data. The flaw illustrates a broader risk in AI-assisted development pipelines where fluent, confident prose can masquerade as engineering proof. The recommended fix is to restrict scoring inputs strictly to file paths, byte-level diffs, and contract artifacts, explicitly excluding any AI-generated narrative files.

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