Hooks allow users to run custom shell commands at defined points in Claude Code’s lifecycle.
Common use cases include notifications, code formatting, logging, feedback, and permission enforcement.
Hooks are defined in JSON settings files using matchers to target specific tool events and shell commands to execute.
Claude Code supports PreToolUse, PostToolUse, Notification, and Stop hook events for precise control.
Hooks communicate results via exit codes or structured JSON to allow blocking, feedback, or continuation.
Because hooks run with full user permissions, users must follow security best practices to avoid data loss or system damage.
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