Everyone automates formatting. Almost nobody automates the feedback loop✨ Here’s the most underused Claude Code hook - and the one with the biggest payoff. Without it: Claude edits your code, says “done”, and you find the broken test an hour later. You’re the QA step. With it: every edit triggers your tests automatically, and failures land straight in Claude’s context - so it fixes its own mistakes before you even see them 🔁 Setup takes 2 minutes. Create .claude/hooks.json in your project:   { “hooks”: { “PostToolUse”: [{ “matcher”: “Write|Edit”, “hooks”: [{ “type”: “command”, “command”: “npm test — —findRelatedTests \”${file}\””, “timeout”: 120 }] }] } } What it does: ⚡ Fires after every file Claude writes or edits 🎯 Runs only the tests related to that file (fast, not noisy) 🔁 Test output goes back to Claude → it self-corrects That’s it. Every AI edit is now self-verifying. You review working code instead of debugging surprises. Try it on your next session and t...