Hooks

Lessons in this group, roughly in build order:

• hooks-overview-lifecycle — Hooks are user-defined shell commands that Claude Code runs automatically at fixed lifecycle events,…
• pretooluse-posttooluse-hooks — The two tool-scoped hooks: PreToolUse runs before a tool call and can veto it; PostToolUse runs after it…
• userpromptsubmit-stop-hooks — The two turn-boundary hooks: UserPromptSubmit fires the instant you send a prompt (and can edit or reject…
• notification-sessionstart-hooks — Two ambient, non-blocking hooks: Notification fires when Claude Code wants your attention; SessionStart…
• writing-debugging-hook-scripts — The practical craft of authoring a hook command — parsing its stdin JSON, returning the right exit code…