Calculator

Verified Integration

Author: @spawning•Category: ServerApplication

GitHub Repository

JSON-RPC 2.0

Protocol Standard

Sub-second

Execution Latency

Active

Operational Status

Client Configuration

— Connect Calculator to Claude Desktop or Cursor in seconds

{
  "mcpServers": {
    "calculator-12": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-calculator-12"
      ],
      "env": {}
    }
  }
}

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows).

Architecture & Capabilities

System Overview

Demonstrates a simple MCP server built with FastMCP, emphasizing modern Python environment and package management.

Indexed Date

7/22/2026

License

Open Source

Protocol Layer

stdio / SSE RPC

Frequently Asked Questions

Architecture and operational details for Calculator

With `uv` installed on your system, navigate to the project's root directory (where `uv.lock` is located) and run `uv sync`. This command will read `uv.lock` and install all pinned dependencies.

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