creating-hooks

You can automate shell commands in Claude Code by configuring hooks at specific lifecycle points like PostToolUse. This enables deterministic execution of custom scripts, ensuring tasks such as file formatting run automatically after edits.

A Claude Code hook is a system that triggers deterministic shell commands at specific lifecycle events like PreToolUse or SessionStart. You need hooks to automate repetitive tasks, enforce project rules, or inject context without manual intervention.

Yes, you can block dangerous commands by configuring a hook for the PreToolUse event. By setting configurable matchers for precise triggering, the hook intercepts and prevents unauthorized shell commands from executing within your project environment.

Hooks use configurable matchers for precise triggering based on your user and project settings. You can configure these matchers within your settings files to ensure specific shell commands only execute when designated file types or commands are interacted with.

Yes, the hook system supports a Notification lifecycle event. You can configure custom shell commands to execute automatically when this event triggers, allowing you to send desktop notifications when Claude Code finishes tasks or needs input.

Hook automation relies on predefined lifecycle events like SessionStart and PostToolUse, meaning shell commands only execute at these specific points. Complex conditional logic outside of configurable matchers is not natively supported by the hook system.