Claude Code Hooks — Core Reference (May 2026)

Hooks execute custom commands, HTTP calls, MCP tool calls, LLM prompts, or agent verifiers 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