Most AI Code Guards Never Proven to Fail, Developer Audit Finds

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A software developer audited 204 automated checks across their repositories and found that 89% had never been tested to confirm they could actually detect a failure. To address this, they wired a known-bad test case through each reviewer's live execution path — not a separate unit test — requiring every guard to reject broken input, accept valid fixes, and reject a deliberately re-introduced bug. The approach caught real breakage, including in guards written that same week to handle the same class of problem. The developer also converted ten real incident records into runnable test cases, all of which passed validation without any being discarded. The broader concern raised is that a reviewer proven capable of saying 'no' on setup day provides no ongoing guarantee it will do so the next day.

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