Demo MCP Server
Click on "Install Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type
@followed by the MCP server name and your instructions, e.g., "@Demo MCP Serveradd 15 and 27"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
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 installAdding 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 listThen 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 runThis server cannot be installed
Maintenance
Resources
Unclaimed servers have limited discoverability.
Looking for Admin?
If you are the server author, to access and configure the admin panel.
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