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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-ent229-1776902294-1e29e41/dVn6EtaDdcjS6s2O/images/brand/langchain-icon.png?fit=max&auto=format&n=dVn6EtaDdcjS6s2O&q=85&s=7b101219a97ec1e733f9163a738ab5c1

LangChain

Complete API reference for LangChain JavaScript/TypeScript, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-ent229-1776902294-1e29e41/dVn6EtaDdcjS6s2O/images/brand/langgraph-icon.png?fit=max&auto=format&n=dVn6EtaDdcjS6s2O&q=85&s=429cf9d0800c89e2bb4d81974a3b7a36

LangGraph

Complete API reference for LangGraph JavaScript/TypeScript, including graph APIs, state management, checkpointing, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-ent229-1776902294-1e29e41/dVn6EtaDdcjS6s2O/images/brand/deep-agents-icon.png?fit=max&auto=format&n=dVn6EtaDdcjS6s2O&q=85&s=9d938da292a0ed8e339744478a93148a

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks

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.
https://mintcdn.com/langchain-5e9cc07a-preview-ent229-1776902294-1e29e41/dVn6EtaDdcjS6s2O/images/brand/deep-agents-icon.png?fit=max&auto=format&n=dVn6EtaDdcjS6s2O&q=85&s=9d938da292a0ed8e339744478a93148a

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks.