# app/tools/math.py

class Calculator:
    def __init__(self):
        self.spec = type("Spec", (), {"name": "calculator"})()

    def add(self, a, b):
        return a + b

    def subtract(self, a, b):
        return a - b

    def multiply(self, a, b):
        return a * b

    def divide(self, a, b):
        return a / b if b != 0 else None