Hooks are customizable shell commands that run at key points in Claude Code’s lifecycle to enforce deterministic behaviors.
Common use cases include notifications, automatic code formatting, command logging, feedback enforcement, and custom permission controls.
Hooks execute with full user permissions and can block or modify tool calls using exit codes or structured JSON output.
Supported hook events include PreToolUse, PostToolUse, Notification, and Stop, each with specific behaviors and input schemas.
Hooks are defined in user, project, or local settings files and use matchers to target specific tools or patterns.
Security considerations emphasize sanitizing inputs, quoting shell variables, avoiding sensitive paths, and thoroughly testing hooks in safe environments.
Hook execution features a 60-second timeout, parallel runs, environment inheritance, and JSON data passed via stdin.
Debugging involves validating configurations, testing commands manually, checking exit codes, and reviewing transcript outputs.
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