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Two Claude Code sessions edited the same file. One of them was wrong. I built a hook to stop that

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

I run multiple Claude Code sessions against the same repo — one refactoring, one fixing tests, sometimes one more exploring. Last week I watched session A carefully edit a function based on code that session B had already rewritten ten minutes earlier. The edit applied cleanly. It was also complete…

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  1. 2026-09-30 08:35 · DEV Community — AI
    Two Claude Code sessions edited the same file. One of them was wrong. I built a hook to stop that

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