FastMCP Calculator Server
A Model Context Protocol (MCP) server providing calculator functionality with authentication options.
Quick Start
1. Install Dependencies
pip install -r requirements.txt2. Choose Authentication Mode
No Authentication (Port 8000) ``bash python calculator_server.py ``
JWT Authentication (Port 8001) ```bash python calculator_server_auth.py
Copy the bearer token from output
**Google OAuth (Port 8002)**Setup: Get credentials from https://console.cloud.google.com/
Create .env file with GOOGLE_CLIENT_ID and GOOGLE_CLIENT_SECRET
python calculator_server_google_oauth.py ```
Calculator Tools
add(a, b)- Add two numberssubtract(a, b)- Subtract numbersmultiply(a, b)- Multiply numbersdivide(a, b)- Divide numberspower(base, exponent)- Raise to powermodulo(a, b)- Get remaindersquare_root(n)- Calculate square rootevaluate_expression(expr)- Evaluate math expressioncalculate_percentage(value, pct)- Calculate percentageaverage(numbers)- Calculate average
Google OAuth Setup
- Go to https://console.cloud.google.com/
- Create OAuth 2.0 Client ID
- Add redirect URI:
http://localhost:8000/auth/callback - Copy credentials to
.env:
GOOGLE_CLIENT_ID=your-id.apps.googleusercontent.com
GOOGLE_CLIENT_SECRET=your-secret
SERVER_BASE_URL=http://localhost:8000Claude Desktop Setup
Edit your Claude config file:
Windows: %APPDATA%\Claude\claude_desktop_config.json macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
{
"mcpServers": {
"calculator": {
"command": "python",
"args": ["path/to/calculator_server.py"]
}
}
}Production
- Use HTTPS (required for Google OAuth)
- Store credentials securely
- Enable rate limiting
- Set up monitoring
