3. Adding Tools

calculator.py

from mcp.server.fastmcp import FastMCPAdd commentMore actions

# Create an MCP server
mcp = FastMCP("Calculator Server", host="0.0.0.0", port=8050)

@mcp.tool()Add commentMore actions
def add_numbers(number1: int, number2: int) -> str:
    """Addes two numbers together.

    Args:
        number1: first number
        number2: second number
    Returns:
        Textual representation of the sum of the two numbers in the format "The sum is: <sum>".
    Example:
        add_numbers(3, 5) -> "The sum is: 8"
    """
    return f"The sum is: {number1 + number2}"


# Run the server
if __name__ == "__main__":
  mcp.run(transport="sse") # change to stdio for stdio i.e. running locally