langchain-mcp-server

praj-tarun/langchain-mcp-server

3.2

If you are the rightful owner of langchain-mcp-server and would like to certify it and/or have it hosted online, please leave a comment on the right or send an email to henry@mcphub.com.

This project is a learning journey into Model Context Protocol (MCP) and its integration with AI tools, focusing on building a simple server to test the protocol.

Tools

  1. hello

    Print a greeting message

  2. calculate

    Perform basic math calculations

My MCP Learning Journey

Started this project to understand how MCP works with AI tools. Built a simple server with basic tools to test the protocol.

What I Built

  • Simple greeting tool (because hello world is always first!)
  • Basic calculator for math operations
  • Debug logging to see what's happening under the hood

Getting Started

Just need Python and a few packages:

pip install -r requirements.txt
pip install mcp flask
python mcp_server.py

That's it! No API keys needed for this basic setup.

How to Test

Web interface (easiest way):

python web_ui.py

Open http://localhost:5000 and click around

Quick function test:

python simple_test.py

Full protocol test (if you're curious about JSON-RPC):

python test_client.py

AI Tool Integration

For Claude:

  1. Copy mcp_config.json to your AI tool's MCP configuration directory
  2. Restart your AI tool
  3. The tools will be available as simple-mcp-server___hello and simple-mcp-server___calculate

Available Tools:

hello

  • Description: Print a greeting message
  • Parameters: name (optional string)
  • Example: {"name": "Alice"}

calculate

  • Description: Perform basic math calculations
  • Parameters:
    • operation (required): "add", "subtract", "multiply", "divide"
    • a (required): First number
    • b (required): Second number
  • Example: {"operation": "add", "a": 10, "b": 5}