Python utility package for building Claude Code hooks

claude-hook-utils is a Python package that simplifies building Claude Code hooks—custom scripts that intercept and validate Claude's tool execution at various stages (before tool use, after execution, on user prompts, and at session start). The package eliminates boilerplate by handling JSON parsing, input validation, and response formatting, allowing developers to focus solely on their validation logic through a simple pattern of extending a HookHandler base class. It supports type safety through dataclasses, requires minimal dependencies, and can be configured in Claude's settings to run multiple hook types from a single Python program.