MCP Multi-Tool Server

Instructions

Calculate the factorial of a non-negative integer.

The factorial of n (written as n!) is the product of all positive integers
less than or equal to n. For example: 5! = 5 × 4 × 3 × 2 × 1 = 120

Args:
    n: A non-negative integer

Returns:
    The factorial of n

Raises:
    ValueError: If n is negative

Implementation Reference

• server.py:125-144 (handler)

  The complete implementation of the 'factorial' MCP tool: @mcp.tool() decorator registers it; function signature with types provides schema; docstring details IO and validation; handler validates input (n >= 0) and computes using math.factorial(n).

  @mcp.tool()
  def factorial(n: int) -> int:
      """
      Calculate the factorial of a non-negative integer.
      
      The factorial of n (written as n!) is the product of all positive integers
      less than or equal to n. For example: 5! = 5 × 4 × 3 × 2 × 1 = 120
      
      Args:
          n: A non-negative integer
      
      Returns:
          The factorial of n
      
      Raises:
          ValueError: If n is negative
      """
      if n < 0:
          raise ValueError("Factorial is only defined for non-negative integers")
      return math.factorial(n)