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Build context-aware, reasoning applications with LangChain’s flexible abstractions and AI-first toolkits.

Core OSS libraries:

Products:

  • LangSmith - platform for building and monitoring production-grade LLM applications
  • LangGraph Platform - infrastructure for deploying LangGraph agents

OSS extensions and apps:

  • ChatLangChain and ChatLangChain.js - chatbot for answering questions about LangChain's open source libraries
  • Open Canvas - document & chat-based UX for writing code or markdown. Inspired by OpenAI's Canvas (TypeScript)
  • OpenGPTs - open source version of OpenAI's GPTs API (Python)
  • Email assistant - AI assistant that helps you maintain your emails (Python)
  • LangChain + Next.js template - template LangChain.js + Next.js application
  • Social media agent - agent for sourcing, curating, and scheduling social media posts with human-in-the-loop (TypeScript)
  • Agent Protocol - Agent Protocol is our attempt at codifying the framework-agnostic APIs that are needed to serve LLM agents in production

Learn more

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Repositories

Showing 10 of 165 repositories
  • langchain-ai/langchain-mcp-adapters’s past year of commit activity
    Python 409 MIT 34 2 0 Updated Mar 15, 2025
  • langgraph Public

    Build resilient language agents as graphs.

    langchain-ai/langgraph’s past year of commit activity
    Python 10,177 MIT 1,685 58 60 Updated Mar 15, 2025
  • langchainjs Public

    🦜🔗 Build context-aware reasoning applications 🦜🔗

    langchain-ai/langchainjs’s past year of commit activity
    TypeScript 13,900 MIT 2,376 76 (1 issue needs help) 90 Updated Mar 15, 2025
  • langgraphjs Public

    Framework to build resilient language agents as graphs.

    langchain-ai/langgraphjs’s past year of commit activity
    TypeScript 1,160 MIT 165 82 20 Updated Mar 15, 2025
  • universal-tool-server Public

    Deploy LangChain Tools Anywhere

    langchain-ai/universal-tool-server’s past year of commit activity
    Python 19 MIT 1 0 0 Updated Mar 14, 2025
  • langchain Public

    🦜🔗 Build context-aware reasoning applications

    langchain-ai/langchain’s past year of commit activity
    Jupyter Notebook 103,364 MIT 16,723 330 (5 issues need help) 81 Updated Mar 14, 2025
  • langsmith-sdk Public

    LangSmith Client SDK Implementations

    langchain-ai/langsmith-sdk’s past year of commit activity
    Python 495 MIT 99 69 29 Updated Mar 15, 2025
  • langchain-ai/react-agent-tool-server’s past year of commit activity
    Python 1 MIT 0 0 2 Updated Mar 14, 2025
  • langsmith-docs Public

    Documentation for langsmith

    langchain-ai/langsmith-docs’s past year of commit activity
    MDX 107 MIT 49 42 3 Updated Mar 15, 2025
  • create-agent-chat-app Public

    The quickest way to get started building a LangGraph app

    langchain-ai/create-agent-chat-app’s past year of commit activity
    TypeScript 25 MIT 10 1 0 Updated Mar 14, 2025