diff --git a/litellm/proxy/_experimental/mcp_server/openapi_to_mcp_generator.py b/litellm/proxy/_experimental/mcp_server/openapi_to_mcp_generator.py
index 60fa218d2da..0ce437bd7b3 100644
--- a/litellm/proxy/_experimental/mcp_server/openapi_to_mcp_generator.py
+++ b/litellm/proxy/_experimental/mcp_server/openapi_to_mcp_generator.py
@@ -183,13 +183,14 @@ def _parse_openapi_spec(text: str) -> Mapping[str, Any]:
         import yaml
 
         class _NoMergeSafeLoader(yaml.SafeLoader):
-            def compose_node(self, parent: Any, index: Any) -> Any:
+            def compose_node(self, parent: object, index: object) -> object:
                 if self.check_event(yaml.events.AliasEvent):
                     raise yaml.YAMLError("YAML aliases are not supported")
                 return super().compose_node(parent, index)
 
-            def flatten_mapping(self, node: Any) -> None:
-                if any(key_node.tag == "tag:yaml.org,2002:merge" for key_node, _ in node.value):
+            def flatten_mapping(self, node: object) -> None:
+                node_values = getattr(node, "value", ())
+                if any(key_node.tag == "tag:yaml.org,2002:merge" for key_node, _ in node_values):
                     raise yaml.YAMLError("YAML merge keys are not supported")
                 super().flatten_mapping(node)