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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-config-1776356647-6c9f431/AwRt-7RLxpmO9mxs/images/brand/langchain-icon.png?fit=max&auto=format&n=AwRt-7RLxpmO9mxs&q=85&s=a54d158ceb78acf33744c0e8590326db

LangChain

Complete API reference for LangChain JavaScript/TypeScript, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-config-1776356647-6c9f431/AwRt-7RLxpmO9mxs/images/brand/langgraph-icon.png?fit=max&auto=format&n=AwRt-7RLxpmO9mxs&q=85&s=8c196249c453ce5406790ebf48864921

LangGraph

Complete API reference for LangGraph JavaScript/TypeScript, including graph APIs, state management, checkpointing, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-config-1776356647-6c9f431/AwRt-7RLxpmO9mxs/images/brand/deep-agents-icon.png?fit=max&auto=format&n=AwRt-7RLxpmO9mxs&q=85&s=229bcc12115d5931b68cd9808257ac13

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-config-1776356647-6c9f431/AwRt-7RLxpmO9mxs/images/brand/deep-agents-icon.png?fit=max&auto=format&n=AwRt-7RLxpmO9mxs&q=85&s=229bcc12115d5931b68cd9808257ac13

Deep Agents

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