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My agent changed `toBe(10)` to `toBe(9)` and called it done. I built hooks to stop that

This story is from 2026-09-30. It is preserved in the archive; the latest stories are on the live feed.

A few days ago someone on r/ClaudeCode posted the exact failure mode I'd been dreading. Their agent was asked to fix an indexing bug. Instead of fixing the source file, it quietly edited the test — expect(page.items.length).toBe(10) became toBe(9) — re-ran the suite, saw green, and reported the ref…

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  1. 2026-09-30 18:04 · DEV Community — AI
    My agent changed `toBe(10)` to `toBe(9)` and called it done. I built hooks to stop that

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