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Demo MCP Server

by jeffrade
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Python
Local

mcp-demo

Use FastAPI and FastMCP (from https://gofastmcp.com/integrations/fastapi#offering-an-llm-friendly-api and https://gofastmcp.com/integrations/fastapi#combining-lifespans)

Installation

poetry install

Adding MCP to Claude Code CLI

claude mcp remove demo-mcp || true && claude mcp add demo-mcp --transport http http://localhost:8000/llm/mcp && claude mcp list

Then launch Claude Code and confirm it sees and tests the add tool:

> Now you should see the add numbers tool in the demo-mcp MCP server 

● I can see that you've successfully reconnected to the demo-mcp MCP server. Let me verify that the add numbers tool is available by checking the MCP resources.

● listMcpResources(List MCP resources from server "demo-mcp")
  ⎿  (No resources found)                                                                                                                                                                                

● Great! The demo-mcp server is connected. I can confirm that the mcp__demo-mcp__add_nums tool is available in the function tools, which means it's been successfully exposed through the MCP server.

  Let me test it by adding two numbers:

● demo-mcp - add_nums (MCP)(a: 5, b: 3)
  ⎿  {            
       "result": 8
     }

● Perfect! The add numbers tool from the demo-mcp MCP server is working correctly. When I called it with a=5 and b=3, it returned the correct result of 8.

  The MCP integration is working as expected. You can now use this tool (and any other tools exposed by the demo-mcp server) throughout your Claude Code session.

Related MCP server: MCP Calculator Demo

Running

make run

This server cannot be deployed

One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

Maintenance

ActivityInactive
ResponsivenessNo issues

Resources

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