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Langgraph-MCP Client for Postgresql Example

Source

LangGraph implementation interacting with a PostgreSQL MCP Server

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Overview

LangGraph-MCP is a client implementation that interacts with a PostgreSQL MCP (Model Context Protocol) server, allowing applications to connect AI models to various data sources and tools.

To use LangGraph-MCP, clone the repository, set up your environment variables in a .env file, install the required packages, and run the query agent to interact with the MCP server.

  • Interaction with PostgreSQL databases through MCP servers. - Easy setup with Docker for running the MCP server. - Utilizes LangGraph agents for efficient data handling.
  1. Connecting AI models to structured data sources for enhanced context.
  2. Building applications that require real-time data interaction with AI.
  3. Facilitating the development of AI applications using standardized protocols.

Add to your AI client

Use these steps to connect Langgraph-MCP Client for Postgresql Example in Cursor, Claude, VS Code, and other MCP-compatible apps. The same JSON appears in the Use with menu above for one-click copy.

Cursor

Add this to your .cursor/mcp.json file in your project root, then restart Cursor.

.cursor/mcp.json

{
  "mcpServers": {
    "langgraph-mcp-client-briancusack": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-langgraph-mcp-client-briancusack"
      ]
    }
  }
}

Claude Desktop

Add this server entry to the mcpServers object in your Claude Desktop config, then restart the app.

~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows)

{
  "mcpServers": {
    "langgraph-mcp-client-briancusack": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-langgraph-mcp-client-briancusack"
      ]
    }
  }
}

Claude Code

Add this to your project's .mcp.json file. Claude Code will detect it automatically.

.mcp.json (project root)

{
  "mcpServers": {
    "langgraph-mcp-client-briancusack": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-langgraph-mcp-client-briancusack"
      ]
    }
  }
}

VS Code (Copilot)

Add this to your .vscode/mcp.json file. Requires the GitHub Copilot extension with MCP support enabled.

.vscode/mcp.json

{
  "servers": {
    "langgraph-mcp-client-briancusack": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-langgraph-mcp-client-briancusack"
      ]
    }
  }
}

Windsurf

Add this to your Windsurf MCP config file, then restart Windsurf.

~/.codeium/windsurf/mcp_config.json

{
  "mcpServers": {
    "langgraph-mcp-client-briancusack": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-langgraph-mcp-client-briancusack"
      ]
    }
  }
}

Cline

Open Cline settings, navigate to MCP Servers, and add this server configuration.

Cline MCP Settings (via UI)

{
  "mcpServers": {
    "langgraph-mcp-client-briancusack": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-langgraph-mcp-client-briancusack"
      ]
    }
  }
}

FAQ

What is MCP?

MCP stands for Model Context Protocol, which standardizes how applications provide context to LLMs.

Do I need to install Docker?

Yes, Docker is required to run the MCP server as a container.

Is there a license for this project?

Yes, this project is licensed under the MIT License.

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