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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-1774858546-a100bff/4en7bRJ9ZWOz6kRe/images/brand/langchain-icon.png?fit=max&auto=format&n=4en7bRJ9ZWOz6kRe&q=85&s=e18e4a95501f7fc857bf693a594e55c3

LangChain

Complete API reference for LangChain JavaScript/TypeScript, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1774858546-a100bff/4en7bRJ9ZWOz6kRe/images/brand/langgraph-icon.png?fit=max&auto=format&n=4en7bRJ9ZWOz6kRe&q=85&s=bafc2246663b830e918ba20a5abe1101

LangGraph

Complete API reference for LangGraph JavaScript/TypeScript, including graph APIs, state management, checkpointing, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1774858546-a100bff/4en7bRJ9ZWOz6kRe/images/brand/deep-agents-icon.png?fit=max&auto=format&n=4en7bRJ9ZWOz6kRe&q=85&s=22bd9bfb787b004ed2146e1944f570d7

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-opensw-1774858546-a100bff/4en7bRJ9ZWOz6kRe/images/brand/deep-agents-icon.png?fit=max&auto=format&n=4en7bRJ9ZWOz6kRe&q=85&s=22bd9bfb787b004ed2146e1944f570d7

Deep Agents

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