Hook Development

Claude Code hooks trigger automated actions based on events like tool use, user prompts, or session start and end. You configure them using prompt-based or command-based formats to execute scripts and perform deterministic tasks.

Prompt-based hooks use advanced API configurations for sophisticated validation checks, while command-based hooks trigger direct script execution. Both formats handle event processing but differ in how they intercept and validate Claude Code operations.

Yes, hooks validate file operations, command execution, and tool calls. You can implement a PreToolUse hook to validate file write operations for path traversal or require explicit user confirmation before modifying sensitive files.

Debugging hooks involves checking event handling configurations, reviewing hook types, and validating script execution paths. The Skill provides debugging techniques and references to identify performance issues and security limitations in hook logic.

Security best practices for hooks include validating tool calls, restricting file modifications, and ensuring command execution follows strict permission rules. Implementing prompt-based checks prevents unauthorized access during automated workflows.

Advanced scripting knowledge is required because the Skill focuses on advanced prompt-based hooks API, covering complex configuration formats, event handling, and performance considerations for building robust automation and validation workflows.