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"""Test MCP server that pretends to be different assistants.
Usage:
python scripts/persona_server.py # stdio transport
python scripts/persona_server.py streamable-http # HTTP transport
"""
from mcp.server.fastmcp import FastMCP
mcp = FastMCP("persona")
_PERSONAS: dict[str, str] = {
"pirate": "Arr! Yer askin' a salty sea dog.",
"robot": "Beep boop. Processing query with logic circuits.",
"poet": "Hark, thy words dance like petals on the wind.",
"chef": "Mamma mia! Let's cook up an answer.",
}
@mcp.tool()
def list_personas() -> list[str]:
"""Return available persona names."""
return list(_PERSONAS.keys())
@mcp.tool()
def chat_as_persona(persona: str, message: str) -> str:
"""Respond to a message in the style of the chosen persona."""
greeting = _PERSONAS.get(persona.lower(), "Hello.")
return f"[{persona}] {greeting} You said: {message}"
@mcp.tool()
def explain_style(persona: str) -> str:
"""Describe how the chosen persona speaks."""
return _PERSONAS.get(
persona.lower(),
"This persona has no special style.",
)
if __name__ == "__main__":
import sys
transport = sys.argv[1] if len(sys.argv) > 1 else "stdio"
port = int(sys.argv[2]) if len(sys.argv) > 2 else 9000
mcp.settings.port = port
mcp.run(transport=transport)
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