Claude Code hooks are user-defined shell commands, LLM prompts, or agent evaluations that execute automatically at specific lifecycle points. Hooks receive JSON context via stdin, take action, and communicate results through exit codes, stdout, and stderr.
When to use: Blocking dangerous commands, auto-formatting after writes, protecting sensitive files, custom notifications, environment setup, enforcing project conventions, auto-approving safe tools, running tests after changes.
When NOT to use: Static context injection (use CLAUDE.md), simple permission rules (use allowlist settings), one-time setup (use shell scripts directly).
Crea hook di eventi per Claude Code che si attivano su chiamate di strumenti, prompt ed eventi del ciclo di vita. Da utilizzare per automatizzare i flussi di lavoro, bloccare comandi pericolosi, proteggere file o aggiungere notifiche. Utilizzare per hook, PreToolUse, PostToolUse, gestione eventi, automazione. Fonte: oakoss/agent-skills.