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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-gpt5-1777059718-47af0d3/T3ididTHxQvkdxAN/images/brand/deep-agents-icon.png?fit=max&auto=format&n=T3ididTHxQvkdxAN&q=85&s=93727c6def6217095ea3ff63aa3f5478

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks.
https://mintcdn.com/langchain-5e9cc07a-preview-gpt5-1777059718-47af0d3/T3ididTHxQvkdxAN/images/brand/langchain-icon.png?fit=max&auto=format&n=T3ididTHxQvkdxAN&q=85&s=acc28b2e844a0e23a2c0efc23481b8b4

LangChain

Complete API reference for LangChain Python, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-gpt5-1777059718-47af0d3/T3ididTHxQvkdxAN/images/brand/langgraph-icon.png?fit=max&auto=format&n=T3ididTHxQvkdxAN&q=85&s=18d05b4b9793a855548463e95089f702

LangGraph

Complete API reference for LangGraph Python, including graph APIs, state management, checkpointing, and more.

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.