Calculator MCP Server

Calculator MCP Server

A simple Model Context Protocol server that exposes calculator tools for addition, subtraction, multiplication, and division.

Features

• Add two numbers
• Subtract two numbers
• Multiply two numbersP
• Divide two numbers with zero-division protection

Requirements

• Node.js 18 or newer
• npm

Install

npm install

Run locally

node npx-server.js

Use with npx

This package exposes a CLI entry point through the bin field in package.json.

npx calculator-mcp-server

Inspect with the MCP Inspector

npx @modelcontextprotocol/inspector npx calculator-mcp-server

Claude Desktop or VS Code configuration

{
  "servers": {
    "Calculator": {
      "command": "npx",
      "args": ["-y", "sk-calculator-mcp-server"],
      "env": {}
    }
  }
}

Publish to npm

npm login
npm config set //registry.npmjs.org/:_authToken=YOUR_TOKEN
npm publish --access public

Before publishing, make sure the package name is available on npm.

Project files

• npx-server.js: MCP server implementation

• package.json: package metadata and CLI entry point

• I have built this just for learning !