fix(grayswan): resolve post-call surface from request route before call_type

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

litellm/proxy/guardrails/guardrail_hooks/grayswan/grayswan.py

@@ -615,10 +615,20 @@ class GraySwanGuardrail(CustomGuardrail):
         Returns the scoped context messages plus the request's tool definitions,
         or ``((), None)`` when the request surface cannot be resolved.
         """
+        from litellm.litellm_core_utils.api_route_to_call_types import get_call_types_for_route
         from litellm.llms import load_guardrail_translation_mappings
 
-        call_type: Final = (logging_obj.call_type if logging_obj is not None else None) or getattr(
-            request_data.get("litellm_logging_obj"), "call_type", None
+        litellm_metadata: Final = request_data.get("litellm_metadata")
+        request_route: Final = (
+            litellm_metadata.get("user_api_key_request_route") if isinstance(litellm_metadata, Mapping) else None
+        )
+        route_call_types: Final = (
+            get_call_types_for_route(request_route) if isinstance(request_route, str) else None
+        )
+        call_type: Final = (
+            (route_call_types[0].value if route_call_types else None)
+            or (logging_obj.call_type if logging_obj is not None else None)
+            or getattr(request_data.get("litellm_logging_obj"), "call_type", None)
         )
         if not isinstance(call_type, str):
             return (), None

tests/test_litellm/proxy/guardrails/guardrail_hooks/test_grayswan.py

@@ -747,6 +747,30 @@ async def test_post_call_scan_only_tool_results_scopes_context_and_tools() -> No
     assert "tools" not in payload
 
 
+@pytest.mark.asyncio
+async def test_post_call_prefers_request_route_over_logging_call_type() -> None:
+    guardrail = _post_call_guardrail()
+    client = _CapturingClient()
+    guardrail.async_handler = client
+
+    await guardrail.apply_guardrail(
+        inputs={"texts": ["response text"]},
+        request_data={
+            **_REQUEST_DATA,
+            "litellm_metadata": {"user_api_key_request_route": "/v1/chat/completions"},
+        },
+        input_type="response",
+        logging_obj=_LoggingObj("responses"),
+    )
+
+    payload = client.calls[0]["json"]
+    assert list(payload["messages"]) == [
+        *_REQUEST_DATA["messages"],
+        {"role": "assistant", "content": "response text"},
+    ]
+    assert list(payload["tools"]) == _REQUEST_DATA["tools"]
+
+
 @pytest.mark.asyncio
 async def test_post_call_unresolvable_call_type_sends_response_only() -> None:
     guardrail = _post_call_guardrail()