Langchain MCP

Semantic search for LangChain, LangGraph, LangSmith & DeepAgents docs and source code.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "langchain-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "langchain-mcp"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Documentation Overview

LangChain MCP

Give your AI assistant complete knowledge of LangChain, LangGraph & LangSmith

Website • Installation • Features • Documentation

Overview

LangChain MCP is a Model Context Protocol (MCP) server that provides semantic search across the entire LangChain ecosystem. Build AI applications faster with instant access to documentation and source code for LangChain, LangGraph, LangSmith, and DeepAgents.

Features

Semantic Search - Natural language queries across all LangChain ecosystem docs
Source Code Search - Find code examples in Python and JavaScript repositories
MCP Protocol - Works seamlessly with Claude Code, Claude Desktop, Cursor, and any MCP-compatible client
Production Ready - Scalable API with authentication and usage tracking
Fast & Accurate - Powered by ChromaDB and OpenRouter embeddings

Installation

Quick Start (Recommended)

bash

# Install globally
npm install -g langchain-mcp

# Login with Google
langchain-mcp login

# Add to Claude Code
claude mcp add langchain-mcp -- npx langchain-mcp

Manual Configuration

Add the following configuration to your client's config file:

Claude Desktop

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
Windows: %APPDATA%\Claude\claude_desktop_config.json

Cursor

macOS/Linux: ~/.cursor/mcp.json
Windows: %USERPROFILE%\.cursor\mcp.json

config.json

{
  "mcpServers": {
    "langchain-mcp": {
      "command": "npx",
      "args": ["langchain-mcp"]
    }
  }
}

Usage

CLI Commands

bash

langchain-mcp login      # Login via Google OAuth
langchain-mcp status     # Check usage and remaining credits
langchain-mcp logout     # Logout and clear credentials

Available MCP Tools

Tool	Description	Parameters
`search_docs`	Search documentation, references, and tutorials	`query`, `limit` (default: 5)
`search_langchain_code`	Search LangChain source code	`query`, `language` (py/js), `limit`
`search_langgraph_code`	Search LangGraph source code	`query`, `language` (py/js), `limit`
`search_deepagents_code`	Search DeepAgents source code	`query`, `language` (py/js), `limit`

Pricing

Free tier available for new users
Donation bonus for supporters

Documentation

Self-deploy

Project Structure

Code

langchain-MCP/
├── packages/
│   ├── ingest/              # Python - Data ingestion (uv)
│   ├── api/                 # TypeScript - API server (Express)
│   ├── mcp-server/          # TypeScript - MCP client (npm package)
│   └── mcp-server-local/    # TypeScript - Local MCP server (dev)
├── config/
│   └── settings.json        # Shared configuration
└── deploy.sh                # Deployment script

Architecture

Setup Development Environment

1. Ingest Documentation & Source Code

bash

cd packages/ingest
uv sync
uv run ingest --list     # List available repositories
uv run ingest docs       # Ingest documentation only
uv run ingest            # Ingest all (docs + code)

2. Run API Server

bash

cd packages/api
npm install
npm run dev              # Development server on port 3000

3. Test Local MCP Server

bash

cd packages/mcp-server-local
npm install
npm run dev

Configuration

All settings in config/settings.json:

config.json

{
  "embedding": {
    "provider": "openrouter",
    "model": "qwen/qwen3-embedding-8b"
  },
  "chromadb": {
    "path": "./data/chroma"
  },
  "chunking": {
    "docs": { "chunk_size": 2000, "chunk_overlap": 200 },
    "code": { "chunk_size": 4000, "chunk_overlap": 200 }
  },
  "repos": [
    {
      "name": "langchain",
      "url": "https://github.com/langchain-ai/langchain",
      "type": "code",
      "languages": ["python", "javascript"]
    }
  ]
}

Supported Embedding Providers

sentence-transformer (local)
openai
cohere
google
ollama
openrouter (default)

See ChromaDB Integrations for more options.

Deployment

The project includes automated deployment scripts for VPS hosting:

bash

# Manual deployment
./deploy.sh

# GitHub Actions (production branch)
git push origin main:production

Deployment includes:

Code synchronization via rsync
Automatic npm installation and build
PM2 process management
Nginx static file serving
Environment variable management

Roadmap

Contributing

Forking and contributions are welcome!

Support

Website: langchain-mcp.xyz
Issues: GitHub Issues
Donate: Support development at Ko-fi

License

MIT License - see the LICENSE file for details.

Built with ❤️ by baixianger

Website • GitHub • npm

Read the full README →View source on GitHub →

Related MCP Servers

View all in Developer Tools View all alternatives

Reviews

No reviews yet — be the first to share how this listing worked for you.

Frequently Asked Questions about Langchain MCP

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "langchain-mcp": { "command": "npx", "args": ["-y", "langchain-mcp"] } }

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Technical Specs & Signals

CategoryDeveloper Tools

27Quality signal: Emerging · 27/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership8/20

Documentation & tools11/30

Adoption & activity1/15

Community engagement0/10

A guidance signal from public completeness & health data — not a user rating. New listings start lower and rise as they add docs, get verified, and grow adoption. Signals we can't observe for a listing are skipped, not counted against it.

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More in 💻 Developer Tools →Best MCP servers for Developers →Alternatives to Langchain MCP →Install in Claude Desktop Install in Cursor Install in VS Code

Langchain MCP

Semantic search for LangChain, LangGraph, LangSmith & DeepAgents docs and source code.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "langchain-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "langchain-mcp"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Documentation Overview

LangChain MCP

Give your AI assistant complete knowledge of LangChain, LangGraph & LangSmith

Website • Installation • Features • Documentation

Overview

Features

Semantic Search - Natural language queries across all LangChain ecosystem docs
Source Code Search - Find code examples in Python and JavaScript repositories
MCP Protocol - Works seamlessly with Claude Code, Claude Desktop, Cursor, and any MCP-compatible client
Production Ready - Scalable API with authentication and usage tracking
Fast & Accurate - Powered by ChromaDB and OpenRouter embeddings

Installation

Quick Start (Recommended)

bash

# Install globally
npm install -g langchain-mcp

# Login with Google
langchain-mcp login

# Add to Claude Code
claude mcp add langchain-mcp -- npx langchain-mcp

Manual Configuration

Add the following configuration to your client's config file:

Claude Desktop

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
Windows: %APPDATA%\Claude\claude_desktop_config.json

Cursor

macOS/Linux: ~/.cursor/mcp.json
Windows: %USERPROFILE%\.cursor\mcp.json

config.json

{
  "mcpServers": {
    "langchain-mcp": {
      "command": "npx",
      "args": ["langchain-mcp"]
    }
  }
}

Usage

CLI Commands

bash

langchain-mcp login      # Login via Google OAuth
langchain-mcp status     # Check usage and remaining credits
langchain-mcp logout     # Logout and clear credentials

Available MCP Tools

Tool	Description	Parameters
`search_docs`	Search documentation, references, and tutorials	`query`, `limit` (default: 5)
`search_langchain_code`	Search LangChain source code	`query`, `language` (py/js), `limit`
`search_langgraph_code`	Search LangGraph source code	`query`, `language` (py/js), `limit`
`search_deepagents_code`	Search DeepAgents source code	`query`, `language` (py/js), `limit`

Pricing

Free tier available for new users
Donation bonus for supporters

Documentation

Self-deploy

Project Structure

Code

langchain-MCP/
├── packages/
│   ├── ingest/              # Python - Data ingestion (uv)
│   ├── api/                 # TypeScript - API server (Express)
│   ├── mcp-server/          # TypeScript - MCP client (npm package)
│   └── mcp-server-local/    # TypeScript - Local MCP server (dev)
├── config/
│   └── settings.json        # Shared configuration
└── deploy.sh                # Deployment script

Architecture

Setup Development Environment

1. Ingest Documentation & Source Code

bash

cd packages/ingest
uv sync
uv run ingest --list     # List available repositories
uv run ingest docs       # Ingest documentation only
uv run ingest            # Ingest all (docs + code)

2. Run API Server

bash

cd packages/api
npm install
npm run dev              # Development server on port 3000

3. Test Local MCP Server

bash

cd packages/mcp-server-local
npm install
npm run dev

Configuration

All settings in config/settings.json:

config.json

{
  "embedding": {
    "provider": "openrouter",
    "model": "qwen/qwen3-embedding-8b"
  },
  "chromadb": {
    "path": "./data/chroma"
  },
  "chunking": {
    "docs": { "chunk_size": 2000, "chunk_overlap": 200 },
    "code": { "chunk_size": 4000, "chunk_overlap": 200 }
  },
  "repos": [
    {
      "name": "langchain",
      "url": "https://github.com/langchain-ai/langchain",
      "type": "code",
      "languages": ["python", "javascript"]
    }
  ]
}

Supported Embedding Providers

sentence-transformer (local)
openai
cohere
google
ollama
openrouter (default)

See ChromaDB Integrations for more options.

Deployment

The project includes automated deployment scripts for VPS hosting:

bash

# Manual deployment
./deploy.sh

# GitHub Actions (production branch)
git push origin main:production

Deployment includes:

Code synchronization via rsync
Automatic npm installation and build
PM2 process management
Nginx static file serving
Environment variable management

Roadmap

Contributing

Forking and contributions are welcome!

Support

Website: langchain-mcp.xyz
Issues: GitHub Issues
Donate: Support development at Ko-fi

License

MIT License - see the LICENSE file for details.

Built with ❤️ by baixianger

Website • GitHub • npm

Read the full README →View source on GitHub →

Related MCP Servers

View all in Developer Tools View all alternatives

Reviews

No reviews yet — be the first to share how this listing worked for you.

Frequently Asked Questions about Langchain MCP

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "langchain-mcp": { "command": "npx", "args": ["-y", "langchain-mcp"] } }

AllMCPs Directory Badge

Full Badge Customizer

Showcase your server listing on GitHub or your project documentation. Embed this dynamic SVG badge to highlight official listing status and live engagement.

Badge Style:

Live Dynamic SVG Preview

Markdown (GitHub README)

[![AllMCPs](https://allmcps.com/api/badge/langchain-mcp?style=directory)](https://allmcps.com/mcp/langchain-mcp)

HTML Embed

<a href="https://allmcps.com/mcp/langchain-mcp"><img src="https://allmcps.com/api/badge/langchain-mcp?style=directory" alt="Langchain MCP on AllMCPs" /></a>