Calculator MCP Server

A Model Context Protocol (MCP) server that provides calculator tools for mathematical operations.

Features

The calculator server provides the following tools:

• add: Add two or more numbers together
• subtract: Subtract numbers (subtracts all subsequent numbers from the first)
• multiply: Multiply two or more numbers together
• divide: Divide numbers (divides first number by all subsequent numbers)
• power: Raise a number to a power
• sqrt: Calculate the square root of a number
• evaluate: Evaluate a mathematical expression safely (supports basic math operations and functions)

Installation

1. Install the required dependencies:

pip install -r requirements.txt

Or install directly:

pip install mcp

Usage

Run the server:

python calculator_server.py

The server communicates via stdio and follows the MCP protocol.

Configuration

To use this server with an MCP client, add the following to your MCP client configuration:

{
  "mcpServers": {
    "calculator": {
      "command": "python",
      "args": ["/path/to/calculator_server.py"],
      "transport": "stdio"
    }
  }
}

Or if you're in the same directory:

{
  "mcpServers": {
    "calculator": {
      "command": "python",
      "args": ["calculator_server.py"],
      "transport": "stdio"
    }
  }
}

Example Tools

Add

{
  "name": "add",
  "arguments": {
    "numbers": [1, 2, 3, 4]
  }
}

Result: 10

Subtract

{
  "name": "subtract",
  "arguments": {
    "numbers": [100, 20, 5]
  }
}

Result: 75

Multiply

{
  "name": "multiply",
  "arguments": {
    "numbers": [2, 3, 4]
  }
}

Result: 24

Divide

{
  "name": "divide",
  "arguments": {
    "numbers": [100, 5, 2]
  }
}

Result: 10.0

Power

{
  "name": "power",
  "arguments": {
    "base": 2,
    "exponent": 8
  }
}

Result: 256

Square Root

{
  "name": "sqrt",
  "arguments": {
    "number": 16
  }
}

Result: 4.0

Evaluate Expression

{
  "name": "evaluate",
  "arguments": {
    "expression": "2 + 2 * 3"
  }
}

Result: 8

The evaluate tool also supports mathematical functions like sin, cos, tan, sqrt, log, exp, pi, e, etc.

Safety

The evaluate tool uses Python's compile() and eval() functions with a restricted namespace for safety. Only basic mathematical operations and functions are allowed.

License

This project is provided as-is for use with the Model Context Protocol.