Basic Tools

factorial_safe_forLLM

Returns n! with friendly error handling for invalid input.

@mcp.tool()
def factorial_safe_forLLM(n: int) -> str:
    """Return n! with friendly error handling for invalid input."""

Parameters

Name	Type	Description
n	int	Non-negative integer

Example prompts

What is 10 factorial?
Calculate 0!
What happens if I ask for factorial of -5?

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echo

Echoes back any message. The simplest possible MCP tool — perfect for verifying the server is connected.

@mcp.tool()
def echo(message: str) -> str:
    """Echo back the message you send."""

Parameters

Name	Type	Description
message	str	Any string

Example prompts

Echo "Hello MCP World" back to me
Use the echo tool to confirm the server is running

Why echo?

The echo tool is the "Hello World" of MCP — it proves the transport layer, server registration, and tool dispatch are all working before you touch anything more complex.