Skip flaky windows test / mulit-client garbage collection (#1592)

Author: jlowin

tests/test_mcp_config.py

@@ -3,6 +3,7 @@
 import inspect
 import logging
 import os
+import sys
 import tempfile
 from collections.abc import AsyncGenerator
 from pathlib import Path
@@ -243,7 +244,8 @@ def add(a: int, b: int) -> int:
 
 
 @pytest.mark.skipif(
-    running_under_debugger(), reason="Debugger holds a reference to the transport"
+    running_under_debugger() or sys.platform.startswith("win32"),
+    reason="Debugger holds a reference to the transport; Windows has process lifecycle issues",
 )
 @pytest.mark.timeout(5)
 async def test_multi_client_lifespan(tmp_path: Path):