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The agent engineering platform.

Core OSS libraries:

• LangChain and LangChain.js – reusable components and integrations for building LLM applications
• LangGraph and LangGraph.js – build LLM agents as graphs
• Deep Agents and Deep Agents.js – agents that can plan, use subagents, and leverage file systems for complex tasks

Commercial Platform:

• LangSmith – platform for building and monitoring production-grade LLM applications

OSS extensions and apps:

• Deep Agents Code - open source coding agent in your terminal, similar to Claude Code or Cursor, powered by any LLM
• Open SWE – open source asynchronous coding agent
• MCP Adapters – make MCP tools compatible with LangChain and LangGraph
• Agent Protocol – our attempt at codifying the framework-agnostic APIs that are needed to serve LLM agents in production

Learn more

• Documentation – unified docs for LangChain projects and services (source)
• Community forum – discuss, get help, and talk shop
• LangChain Academy – comprehensive, free courses on LangChain libraries and products, made by the LangChain team