Claude Code Hooks Mastery is a learning resource and demonstration project that teaches how to use Claude Code hooks to control Claude Code's behavior through deterministic and non-deterministic mechanisms.
The project addresses the challenge of understanding and implementing Claude Code's hook system, which fires at thirteen different points in the code execution lifecycle. It demonstrates how to intercept and modify behavior at each stage: from the initial UserPromptSubmit hook that fires when a user submits a prompt, through PreToolUse and PostToolUse hooks that wrap tool execution, to notification and completion hooks that handle user feedback and agent lifecycle events. The approach uses single-file Python scripts built with UV as a package manager, making each example self-contained and easy to run.
This resource suits developers building agentic AI systems who need to add validation, security filtering, or custom behavior to Claude Code workflows. It is particularly valuable for those implementing team-based validation systems, orchestrating multiple sub-agents, or building meta-agents that coordinate other agents. The project demonstrates practical patterns like blocking dangerous commands in the PreToolUse hook, injecting context during prompt submission, and triggering text-to-speech alerts through notification hooks. It also covers integration with optional services like ElevenLabs for audio feedback and Firecrawl for web scraping, showing how to compose Claude Code with external tools and MCP servers.
The project maintains active development with regular updates to hook implementations and new feature demonstrations. The codebase shows consistent refinement of the hook lifecycle documentation and payload handling. Examples are continuously expanded to cover additional integration patterns and use cases. The project demonstrates thorough testing of edge cases in hook error codes and flow control mechanisms.
