langchain-langgraph-guide

What problem does it solve?

LangChain and LangGraph TypeScript APIs evolve rapidly, leading developers to build applications with outdated patterns, incorrect state management, or broken routing if they rely on cached knowledge instead of official documentation.

Core Features & Use Cases

• Docs-First Guidance: All recommendations are tied to official LangChain documentation, verified via the SearchDocsByLangChain MCP tool to ensure API accuracy for TypeScript implementations.
• Full Development Lifecycle Support: Covers graph architecture design, agent/tool/RAG pipeline implementation, execution error debugging, and unit/integration test writing for LangChain and LangGraph projects.
• Curated Reference Materials: Includes dedicated guides for common LangGraph design patterns, state and routing debugging techniques, and testing strategies for nodes, tools, and full graph execution.
• Real-World Use Case: For example, if you are building a tool-calling agent with LangGraph, this skill ensures you use the correct StateGraph, ToolNode, and annotation-based state patterns to avoid common errors like missing reducers or recursion limit overruns.

Quick Start

Use the langchain-langgraph-guide skill to build a TypeScript LangGraph agent that takes user queries, searches the web for relevant information, and returns summarized results.