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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-fjmorr-1776124005-78f22f8/EPKx6pOaX8gw78He/images/brand/langchain-icon.png?fit=max&auto=format&n=EPKx6pOaX8gw78He&q=85&s=76d78c90395359da80a4855e8aabfde0

LangChain

Complete API reference for LangChain JavaScript/TypeScript, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-fjmorr-1776124005-78f22f8/EPKx6pOaX8gw78He/images/brand/langgraph-icon.png?fit=max&auto=format&n=EPKx6pOaX8gw78He&q=85&s=b7f3be9657c5feaa992300ce5a269796

LangGraph

Complete API reference for LangGraph JavaScript/TypeScript, including graph APIs, state management, checkpointing, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-fjmorr-1776124005-78f22f8/EPKx6pOaX8gw78He/images/brand/deep-agents-icon.png?fit=max&auto=format&n=EPKx6pOaX8gw78He&q=85&s=f7518ca49c9b5afde4f2fd50f88fb9c9

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-fjmorr-1776124005-78f22f8/EPKx6pOaX8gw78He/images/brand/deep-agents-icon.png?fit=max&auto=format&n=EPKx6pOaX8gw78He&q=85&s=f7518ca49c9b5afde4f2fd50f88fb9c9

Deep Agents

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