LangChain ORG

The agent engineering platform.

Framework for building AI applications that chain together language models, data sources, and tools with swappable components.

Build resilient agents.

A Python framework for building durable, stateful AI agents that can pause for human input, resume after failures, and maintain memory across sessions.

The batteries-included agent harness.

Deep Agents is a ready-to-use AI agent framework that gives you a fully wired AI assistant out of the box, with file access, shell commands, multi-step planning, and sub-agent delegation, in a single Python function call, built on LangGraph.

The agent engineering platform

TypeScript framework for building LLM-powered apps. Provides model connectors, retrievers, vector store integrations, and chains to wire AI into JavaScript backends.

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An open-source AI research agent that takes a question, searches the web iteratively, reads and summarizes sources, and compiles findings into a structured written report, no coding needed to use it.

An Open-Source Asynchronous Coding Agent

Fully local web research and report writing assistant

Automated web research tool that uses a locally running AI model to iteratively search the web, summarize findings, identify gaps, and repeat until it produces a cited Markdown report, no cloud AI required.

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📃 A better UX for chat, writing content, and coding with LLMs.

LangChain 🔌 MCP

Framework to build resilient language agents as graphs.

🦜💬 Web app for interacting with any LangGraph agent (PY & TS) via a chat interface.

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📲 An agent for sourcing, curating, and scheduling social media posts with human-in-the-loop.

LangChain + Next.js starter template

LangServe 🦜️🏓

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An open-source, no-code agent building platform.

Build an email assistant with human-in-the-loop and memory

Custom UI for Deep Agents

Reference implementations of several LangChain agents as Streamlit apps

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For your multi-agent needs

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The batteries included agent harness.

🦜⛏️ Did you say you like data?

Readymade evaluators for your LLM apps

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📥 An inbox UX for interacting with human-in-the-loop agents.

Expose llms-txt to IDEs for development

LangSmith Client SDK Implementations

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LangGraph template for a simple ReAct agent

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Readymade evaluators for agent trajectories

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Build LangGraph agents with large numbers of tools

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Learn about the fundamentals of LangGraph through a series of notebooks

REPO MOVED

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A collection of generative UI agents written with LangGraph.js

🦜🔗 LangChain interfaces to Google's suite of AI products (e.g. Gemini & Vertex AI)

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Unified LangChain documentation.

A managed RAG API server.

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Build LangChain Applications on AWS

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⚠️ No longer maintained, see linked issue

LangChain abstractions backed by Postgres Backend

Teach LangChain using LangChain!

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** THIS REPO HAS MOVED TO https://github.com/langchain-ai/langchainjs/tree/main/libs/langchain-mcp-adapters ** Adapters for integrating Model Context Protocol (MCP) tools with LangChain.js applications, supporting both stdio and SSE transports.

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Safely run untrusted Python code using Pyodide and Deno

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LangGraph Studio template for creating an agent that does web research to genearte or enrich structured data.

🧍‍♂️LLM as a manager for approval processes.

An implementation of a computer use agent (CUA) using LangGraph

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fullstack chat agent with authentication, request credits and payments built in

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The quickest way to get started building a LangGraph app

This repo is deprecated. Please go to langchain-ai/docs.

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Resources for the LangSmith Academy Course

A bot with memory, built on LangGraph Cloud.

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A general-purpose coding agent that runs inside an NVIDIA OpenShell sandbox, orchestrated by Deep Agents and powered by NVIDIA Nemotron. The agent writes and executes code in an isolated, policy-governed Linux environment.

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Assistant for voice-to-blog writing

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Build secure LangChain applications on Azure

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CLI for fetching LangSmith data

Integrations between MongoDB, Atlas, LangChain, and LangGraph

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CLI to generate LangGraph stubs from a specification

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⚠️ No longer maintained, see linked issue

An AI Clone For Any X Profile

Repository hosting Langchain helm charts.

Elasticsearch integration into LangChain

Empty langgraph project template.

Example LangGraph.js project made to run in LangGraph Studio

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Event server integrations with Slack and other messaging platforms.

🦜🔗 LangChain interface to Weaviate

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Ablation study comparing Claude Code configurations

A coding agent-first CLI for interacting with LangSmith.

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LangSmith plugins for Claude Code

The LangChain wrapper of Milvus vector database for efficient vector search, full-text search, hybrid retrieval and RAG.

A supervisor agent for open agent platform

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🦜🔗 LangChain interface to LiteLLM

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An example repository for getting started with the Agent Inbox and LangGraph

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LangGraph Typescript Agents Notebooks: email, human in the loop, memory

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Documentation and examples around LangChain's streaming capabilities.

Workshop series teaching the AI Engineering Lifecycle using LangChain, LangGraph, and LangSmith

LangGraph.js CLI and in-memory server implementation

🚚 REPOSITORY MOVED 🚚 - new location: https://github.com/langchain-ai/langgraphjs/tree/main/libs/langgraph-supervisor

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DataStax Astra DB integration with LangChain

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Learn about the fundamentals of LangGraph through building an ambient email agent

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Build LangChain applications with Pinecone

LangSmith Java SDK.

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An example repository for getting started with the Agent Inbox and LangGraph.js

Three voice-agent backends (LiveKit, OpenAI Realtime, Google ADK Live) sharing one console interface, each instrumented for LangSmith

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A repository of curated code snippets and examples of common design patterns, features and best practices for building powerful, context-rich applications with LangGraph and LangSmith

A simple demo of various ways to mask PII for traces ingested into LangSmith

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Repository containing langchain terraform modules

A toolkit of utilities for managing LangGraph deployments, including thread cleanup, monitoring tools, and operational maintenance scripts

Build LangChain applications with Meta

Community-maintained LangChainJS integrations

Example Python monorepo for deploying to LangGraph Platform

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A CLI tool to help users migrate data from their LangSmith cloud/self-hosted workspaces

Tracing from Claude Code -> LangSmith

LangSmith OTEL collector proxy

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Public organization profile

A generic researcher

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Self-contained code export for LangSmith Fleet deep agents

A collection of handy scripts and utilities for everyday development and system tasks.

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LangSmith plugin for OpenAI Codex

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LangChain x Llama Stack

stateful deepagents demo

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Bash scripts to extract, scrub, and upload LangSmith traces.

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A repository containing the SQLite database and instructions for the Applied AI take home assignment

Simple starter code for building a customer support agent with LangSmith Studio

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Example JS monorepo for deploying to LangGraph Platform

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LangSmith PI Extension

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OpenCode plugin for LangSmith

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