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I attack-tested my agent's seatbelt. Here's what survived.

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A blocklist for destructive agent commands passed its own tests — then failed four bypasses I wrote myself. The fix isn't smarter parsing. Tested receipts inside. I wrote a seatbelt for my AI coding agent: a PreToolUse hook that inspects every Bash call before it runs and blocks the destructive ones. It passed its own test suite — five runs, five green.

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