hook-development

Claude Code plugin hooks enable event-driven automation by allowing you to execute custom logic for PreToolUse, PostToolUse, Stop, and SessionStart events. You configure them using prompt-based and command-based formats to enforce validation policies.

To validate file writes and prevent data leaks, implement a PreToolUse hook that analyzes the content and file path before any write operation is allowed, stopping accidental exposure of sensitive information during plugin execution.

Available Claude Code hook types include PreToolUse, PostToolUse, Stop, and SessionStart, allowing developers to trigger prompt-based or command-based validation and automation at various stages of the plugin execution lifecycle.

When implementing Claude Code hooks, follow security best practices by enforcing policy checks before tool execution, and optimize performance by using command-based hooks for lightweight operations alongside provided debugging utilities to monitor event handling.

Claude Code hook development requires no external dependencies, utilizing built-in scripts and reference components to guide configuration formats, event handling, and debugging utilities directly within your existing plugin development environment.