fix test_list_tools

Author: narumiruna

tests/test_server.py

@@ -9,8 +9,10 @@ def server_params() -> StdioServerParameters:
     return StdioServerParameters(command="uv", args=["run", "mcpservertemplate"])
 
 
-@pytest.asyncio
+@pytest.mark.asyncio
 async def test_list_tools(server_params: StdioServerParameters) -> None:
     async with stdio_client(server_params) as (read, write), ClientSession(read, write) as session:
+        await session.initialize()
+
         result = await session.list_tools()
         assert len(result.tools) > 0