MCP Calculator Server

A simple Model Context Protocol server that exposes basic calculator tools. Built with the official mcp Python SDK and FastMCP.

Tools

Tool	Description
`add`	Add two numbers
`subtract`	Subtract one number from another
`multiply`	Multiply two numbers
`divide`	Divide one number by another
`power`	Raise a number to a power
`square_root`	Compute the square root of a number

Setup

Requires Python 3.12+ and uv.

cd mcp-calculator
uv sync

Run

Start the server (stdio transport, default for MCP clients like Cursor):

uv run calculator_server.py

For HTTP transport (e.g. MCP Inspector), change the last line of calculator_server.py to mcp.run(transport="streamable-http") and connect to http://localhost:8000/mcp.

Cursor configuration

Add this to your Cursor MCP settings:

{
  "mcpServers": {
    "calculator": {
      "command": "uv",
      "args": [
        "run",
        "--directory",
        "/Users/premithun/Downloads/cursor_projects/mcp-calculator",
        "calculator_server.py"
      ]
    }
  }
}

Replace the --directory path with the absolute path to this project on your machine.