hooks-core-reference
Claude Code Hooks — Core Reference (January 2026)
Hooks execute custom commands or prompts in response to Claude Code events. Use for automation, validation, formatting, and security.
For JSON input/output schemas, activate Skill(skill: "plugin-creator:hooks-io-api").
For working examples and patterns, activate Skill(skill: "plugin-creator:hooks-patterns").
All Hook Events
| Event | When Fired | Matcher Applies | Common Uses |
|---|---|---|---|
PreToolUse |
Before tool execution | Yes — tool name | Validation, blocking |
PermissionRequest |
When user shown permission dialog | Yes — tool name | Auto-approval policies |
PostToolUse |
After successful tool execution | Yes — tool name | Formatting, linting |
PostToolUseFailure |
After tool fails | Yes — tool name | Error handling |
Notification |
When Claude wants attention | Yes — notification type | Custom notifications |
UserPromptSubmit |
User submits prompt | No | Input validation |
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