fix(guardrails): only cite message scoping in the not_run reason when scoping is on

A request whose messages carry no scannable content at all, with no skip flag set, now records the neutral reason no scannable content instead of blaming configuration

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

litellm/llms/openai/chat/guardrail_translation/handler.py

@@ -212,7 +212,11 @@ class OpenAIChatCompletionsHandler(BaseTranslation):
 
         elif not images_to_check and not guardrail_to_apply.records_own_guardrail_information:
             guardrail_to_apply.add_standard_logging_guardrail_information_to_request_data(
-                guardrail_json_response="no scannable content after message scoping",
+                guardrail_json_response=(
+                    "no scannable content after message scoping"
+                    if skip_system or skip_tool or scan_only_tool_results
+                    else "no scannable content"
+                ),
                 request_data=data,
                 guardrail_status="not_run",
             )

tests/test_litellm/llms/openai/chat/guardrail_translation/test_openai_guardrail_handler.py

@@ -1917,6 +1917,21 @@ class TestNoScannableContentRecordsNotRun:
         assert len(entries) == 1
         assert entries[0]["guardrail_name"] == "skip-system-guardrail"
         assert entries[0]["guardrail_status"] == "not_run"
+        assert entries[0]["guardrail_response"] == "no scannable content after message scoping"
+
+    @pytest.mark.asyncio
+    async def test_empty_content_without_scoping_does_not_blame_scoping(self):
+        handler = OpenAIChatCompletionsHandler()
+        guardrail = MockGuardrail(guardrail_name="unscoped-guardrail")
+        data = {"messages": [{"role": "user", "content": None}]}
+
+        await handler.process_input_messages(data=data, guardrail_to_apply=guardrail)
+
+        assert guardrail.last_inputs is None
+        entries = self._recorded_entries(data)
+        assert len(entries) == 1
+        assert entries[0]["guardrail_status"] == "not_run"
+        assert entries[0]["guardrail_response"] == "no scannable content"
 
     @pytest.mark.asyncio
     async def test_self_recording_guardrail_is_left_alone(self):