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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-linkto-1776771947-7bff0f6/la76JVcq513CsadH/images/brand/langchain-icon.png?fit=max&auto=format&n=la76JVcq513CsadH&q=85&s=34c745c13a5d3b751195145b27e325e5

LangChain

Complete API reference for LangChain JavaScript/TypeScript, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-linkto-1776771947-7bff0f6/la76JVcq513CsadH/images/brand/langgraph-icon.png?fit=max&auto=format&n=la76JVcq513CsadH&q=85&s=d20b621c9634aae5dbc23960fd68d9d3

LangGraph

Complete API reference for LangGraph JavaScript/TypeScript, including graph APIs, state management, checkpointing, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-linkto-1776771947-7bff0f6/la76JVcq513CsadH/images/brand/deep-agents-icon.png?fit=max&auto=format&n=la76JVcq513CsadH&q=85&s=23eed6ee252188072978cbe46bfbd377

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-linkto-1776771947-7bff0f6/la76JVcq513CsadH/images/brand/deep-agents-icon.png?fit=max&auto=format&n=la76JVcq513CsadH&q=85&s=23eed6ee252188072978cbe46bfbd377

Deep Agents

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