# Dive into LangGraph

Dive into LangGraph is an open-source tutorial and Claude Code Agent Skill that teaches LangGraph and LangChain by building a ReAct agent through 14 chapters covering state graphs, middleware, memory and MCP.

Dive into LangGraph is a Chinese-and-English open e-book aimed at helping agent developers quickly learn the LangGraph framework, published shortly after LangGraph's 1.0 release and written entirely against that stable version, with no leftover material from the earlier 0.6 line. Fourteen chapters cover building a first ReAct agent, state graphs, custom middleware for budget control, message truncation and PII detection, human-in-the-loop interaction, short- and long-term memory, context engineering, MCP server integration, a supervisor pattern using subagents-as-tools, parallel execution, three approaches to retrieval-augmented generation, web search integration, Deep Agents, and a Gradio chat application built in chapter 13.

The tutorial also installs as a Claude Code Agent Skill through a single command, so a coding agent can apply the same material directly when writing LangChain or LangGraph code, and it includes a debug page reachable through the langgraph-cli development server.

Website: http://www.luochang.ink/dive-into-langgraph/