This repository is an open-source e-book and tutorial guide for learning LangGraph 1.0, a framework for building stateful, multi-step AI agent applications within the LangChain ecosystem. It targets agent developers and walks through concepts from fundamentals to advanced usage with hands-on Jupyter Notebook examples. The project has been packaged as a callable Claude Code skill, allowing AI coding assistants to directly generate LangGraph code following the tutorial’s patterns.