Claude Code Hook

• Claude Code Subagents SubagentStop: Runs when subagent tasks complete

• PreToolUse: Runs before tool calls (can block them)

• PermissionRequest: Runs when a permission dialog is shown (can allow or deny)

• PostToolUse: Runs after tool calls complete

• UserPromptSubmit: Runs when the user submits a prompt, before Claude processes it

• Notification: Runs when Claude Code sends notifications

• Stop: Runs when Claude Code finishes responding

• PreCompact: Runs before Claude Code is about to run a compact operation
• recommendation: hook before summarization, update memory, state

• SessionStart: Runs when Claude Code starts a new session or resumes an existing session

• SessionEnd: Runs when Claude Code session ends

Hook

• Notifications

• Formatting

• Logging

• Feedback

Get started with Claude Code hooks - Claude Code Docs

Learn how to customize and extend Claude Code's behavior by registering shell commands

https://code.claude.com/docs/en/hooks-guide

Hooks reference - Claude Code Docs

This page provides reference documentation for implementing hooks in Claude Code.

https://code.claude.com/docs/en/hooks