calculator-mcp

A calculator MCP server with 7 tools: add, subtract, multiply, divide, power, sqrt, modulo.

Usage with Claude Code

claude mcp add calculator npx calculator-mcp

Or add manually to ~/.claude/settings.json:

{
  "mcpServers": {
    "calculator": {
      "command": "npx",
      "args": ["calculator-mcp"]
    }
  }
}

Tools

| Tool | Description | Parameters | |------|-------------|------------| | add | a + b | a, b | | subtract | a - b | a, b | | multiply | a × b | a, b | | divide | a / b | a, b | | power | a ^ b | a, b | | sqrt | √a | a | | modulo | a % b | a, b |

Remote Deployment

Start in HTTP mode:

TRANSPORT=http PORT=3000 node index.js

Then connect via SSE:

{
  "mcpServers": {
    "calculator": {
      "command": "npx",
      "args": ["calculator-mcp"],
      "transport": "sse",
      "url": "http://your-server:3000/sse"
    }
  }
}

License

MIT