from langchain.tools import Tool
import operator

def add(a: float, b: float) -> float:
    """Adds two numbers."""
    return operator.add(a, b)

def subtract(a: float, b: float) -> float:
    """Subtracts the second number from the first."""
    return operator.sub(a, b)

def multiply(a: float, b: float) -> float:
    """Multiplies two numbers."""
    return operator.mul(a, b)

def divide(a: float, b: float) -> float:
    """Divides the first number by the second. Returns an error message if division by zero."""
    if b == 0:
        return "Error: Cannot divide by zero."
    return operator.truediv(a, b)

add_tool = Tool(
    name="calculator_add",
    func=add,
    description="Adds two numbers. Input should be two numbers (a, b)."
)

subtract_tool = Tool(
    name="calculator_subtract",
    func=subtract,
    description="Subtracts the second number from the first. Input should be two numbers (a, b)."
)

multiply_tool = Tool(
    name="calculator_multiply",
    func=multiply,
    description="Multiplies two numbers. Input should be two numbers (a, b)."
)

divide_tool = Tool(
    name="calculator_divide",
    func=divide,
    description="Divides the first number by the second. Input should be two numbers (a, b)."
)