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Comprehensive API reference documentation for the LangChain and LangGraph Python and TypeScript libraries.

Reference sites

https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1783454697-4d4e2b4/jftooiwBy_OUDTyv/images/brand/deep-agents-icon.png?fit=max&auto=format&n=jftooiwBy_OUDTyv&q=85&s=f076b0d11251d6bee5f346deec9b57a8

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks.
https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1783454697-4d4e2b4/jftooiwBy_OUDTyv/images/brand/langchain-icon.png?fit=max&auto=format&n=jftooiwBy_OUDTyv&q=85&s=ec840946cc568d9b6f030ae96d6ea8de

LangChain

Complete API reference for LangChain Python, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1783454697-4d4e2b4/jftooiwBy_OUDTyv/images/brand/langgraph-icon.png?fit=max&auto=format&n=jftooiwBy_OUDTyv&q=85&s=6f688b6e8b808a2f89284f2716472a60

LangGraph

Complete API reference for LangGraph Python, including graph APIs, state management, checkpointing, and more.

LangChain Integrations

LangChain packages to connect with popular LLM providers, vector stores, tools, and other services.

MCP Adapter

Use Model Context Protocol (MCP) tools within LangChain and LangGraph applications.