fix example

Author: ihrpr

README.md

@@ -434,15 +434,21 @@ def add_two(n: int) -> int:
 
 ```python
 # main.py
+import contextlib
 from fastapi import FastAPI
 from mcp.echo import echo
 from mcp.math import math
 
 
-app = FastAPI()
+# Create a combined lifespan to manage both session managers
+@contextlib.asynccontextmanager
+async def lifespan(app: FastAPI):
+    async with echo.mcp.session_manager.run():
+        async with math.mcp.session_manager.run():
+            yield
 
-# Use the session manager's lifespan
-app = FastAPI(lifespan=lambda app: echo.mcp.session_manager.run())
+
+app = FastAPI(lifespan=lifespan)
 app.mount("/echo", echo.mcp.streamable_http_app())
 app.mount("/math", math.mcp.streamable_http_app())
 ```