#!/usr/bin/env python3
"""Minimal MCP Server with FastMCP - Simple Working Solution"""
import os
import uvicorn
from mcp.server.fastmcp import FastMCP
mcp = FastMCP("Simple Server")
@mcp.tool()
def add(a: float, b: float) -> float:
"""Add two numbers"""
return a + b
@mcp.tool()
def multiply(a: float, b: float) -> float:
"""Multiply two numbers"""
return a * b
def main():
"""Run the server"""
host = os.getenv("HOST", "0.0.0.0")
port = int(os.getenv("PORT", "8000"))
print("Starting MCP server...")
print(f"HOST: {host}")
print(f"PORT: {port}")
print("MCP endpoint will be available at the server URL + /mcp")
# For production (Railway), use direct uvicorn control
if host == "0.0.0.0" or os.getenv("RAILWAY_ENVIRONMENT"):
print("🚀 PRODUCTION MODE: Using FastMCP's streamable_http_app directly")
try:
# Get the streamable HTTP app from FastMCP (it's a method, so call it)
app = mcp.streamable_http_app()
if app is None:
raise AttributeError("streamable_http_app() returned None")
print(f"✅ SUCCESS: Got streamable_http_app from FastMCP!")
print(f"App type: {type(app)}")
print(f"Running uvicorn on {host}:{port}")
# Run with uvicorn directly - this WILL bind to 0.0.0.0
uvicorn.run(app, host=host, port=port, log_level="info", access_log=True)
except Exception as e:
print(f"❌ Could not get streamable_http_app: {e}")
print("🔄 Falling back to FastMCP default...")
# Fallback to FastMCP (will still bind to 127.0.0.1 but at least it runs)
mcp.run(transport="streamable-http")
else:
print("🏠 LOCAL DEVELOPMENT: Using FastMCP default")
mcp.run(transport="streamable-http")
if __name__ == "__main__":
main()
