diff --git a/litellm/proxy/guardrails/guardrail_hooks/azure/base.py b/litellm/proxy/guardrails/guardrail_hooks/azure/base.py
index ab4c3d54abf..acf0e12b8e0 100644
--- a/litellm/proxy/guardrails/guardrail_hooks/azure/base.py
+++ b/litellm/proxy/guardrails/guardrail_hooks/azure/base.py
@@ -139,10 +139,10 @@ class AzureGuardrailBase:
             responses_input: Final = data.get("input")
             if not isinstance(responses_input, (str, list)):
                 return None
-            validated_input: Final = cast(ResponseInputParam, responses_input)
+            validated_input: Final = cast(ResponseInputParam, responses_input)  # cast-ok: isinstance narrowed to str | list, the ResponseInputParam shape
             return get_last_user_message(ResponsesAPIRequestUtils.responses_input_to_chat_messages(validated_input))
 
         messages: Final = data.get("messages")
         if not isinstance(messages, list):
             return None
-        return get_last_user_message(cast(list[AllMessageValues], messages))
+        return get_last_user_message(cast(list[AllMessageValues], messages))  # cast-ok: isinstance narrowed to list, the message list shape