Math MCP Server

A clean and simple Model Context Protocol (MCP) server built with FastMCP that provides four fundamental mathematical operations as tools.

Features

This MCP server exposes the following tools:

• add - Add two numbers together

• subtract - Subtract the second number from the first

• multiply - Multiply two numbers together

• divide - Divide the first number by the second (with zero-division protection)

Related MCP server: Calculator MCP Server

Installation

# Install dependencies
uv sync

Usage

Running the Server

The server can be run directly using:

uv run math-mcp-server

Configuring in Kiro or Other MCP Clients

Add this server to your MCP client configuration (e.g., ~/.kiro/settings/mcp.json):

{
  "mcpServers": {
    "math": {
      "command": "uv",
      "args": [
        "--directory",
        "d:\\MCP\\math-mcp-server",
        "run",
        "math-mcp-server"
      ]
    }
  }
}

Example Tool Usage

Once configured, you can use the tools through your MCP client:

Addition:

• Input: a=5, b=3

• Output: 5 + 3 = 8

Subtraction:

• Input: a=10, b=4

• Output: 10 - 4 = 6

Multiplication:

• Input: a=7, b=6

• Output: 7 × 6 = 42

Division:

• Input: a=15, b=3

• Output: 15 ÷ 3 = 5.0

Code Structure

The implementation is extremely simple and readable using FastMCP:

from fastmcp import FastMCP

mcp = FastMCP("Math Operations Server")

@mcp.tool()
def add(a: float, b: float) -> str:
    """Add two numbers together."""
    result = a + b
    return f"{a} + {b} = {result}"

# ... and so on for subtract, multiply, divide

Each operation is a separate @mcp.tool() decorated function, making the code:

• Easy to read and understand

• Simple to extend with new operations

• Self-documenting with type hints and docstrings

Project Structure

math-mcp-server/
├── src/
│   └── math_mcp_server/
│       └── __init__.py       # Main server implementation (4 simple functions!)
├── pyproject.toml            # Project configuration
└── README.md                 # This file

Requirements

• Python >= 3.14

• fastmcp >= 3.4.6

License

MIT