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Make Claude Code run your tests after every edit with a PostToolUse hook

This story is from 2026-10-12. It is preserved in the archive; the latest stories are on the live feed.

Telling a coding agent "run the tests after you change something" works most of the time. A hook makes it work every time, and it costs about a dozen lines. Claude Code fires PostToolUse hooks after a tool call finishes. If you match on the file-editing tools, you get a reliable "after every edit"…

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  1. 2026-10-12 01:11 · DEV Community — AI
    Make Claude Code run your tests after every edit with a PostToolUse hook

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