Claude Code hooks enforce commands at key project moments
Claude Code hooks let users run shell commands automatically at specific times in a project, unlike CLAUDE.md, which only makes suggestions. These hooks execute without AI discretion, triggered by events like session start, user prompts, or tool use. The official documentation lists over 30 events, but six are most useful for beginners: SessionStart, UserPromptSubmit, PreToolUse, PostToolUse,…
What you can do with it
AI at Work →Protect sensitive files with Claude Code hooks
Runs a script before file edits to halt access to blocked files like `.env`.
- Who for
- founders, support teams and operations
- Cost
- included in a tool you already have
- Effort
- minutes
Use it for
- Protect sensitive files
- Enforce formatting rules
- Trigger notifications
How to set it up · From the article
- Edit `settings.json` in your project directory and add the hook under the `PreToolUse` event.
- Set the `matcher` to include the file pattern (e.g., `.env`).
- Add the command to block access (e.g., `exit 2`).
- Verify with `/hooks` in Claude Code to confirm activation.
Watch out Hooks run locally-only use trusted commands to avoid system risks
Key points from the news
- Claude Code hooks run shell commands automatically at predefined events like file edits or user prompts
- Three beginner hooks recommended: notify on input waits, auto-format edited files, block access to `.env` or `.git`
- Hooks are configured in `settings.json` with a `matcher` field to target specific tools or actions
What are Claude Code hooks? A mechanism to make the AI "always" do something | 3 to add first
note.com · 28 October 2026
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