Address remaining Greptile feedback: timeout, redact guard

- Add explicit 10s timeout to async_handler.post() to prevent
  indefinite hangs when PromptGuard API is unresponsive
- Guard redact path: only update inputs["texts"] when the key
  was originally present, avoiding phantom key injection
- Add test: redact with structured_messages only does not create
  texts key (41 tests total)

litellm/proxy/guardrails/guardrail_hooks/promptguard/promptguard.py

@@ -148,6 +148,7 @@ class PromptGuardGuardrail(CustomGuardrail):
                     "Content-Type": "application/json",
                 },
                 json=payload,
+                timeout=10.0,
             )
             response.raise_for_status()
             result = response.json()
@@ -184,11 +185,14 @@ class PromptGuardGuardrail(CustomGuardrail):
             if redacted:
                 if structured_messages:
                     inputs["structured_messages"] = redacted
-                extracted = self._extract_texts_from_messages(
-                    redacted,
-                )
-                if extracted:
-                    inputs["texts"] = extracted
+                if "texts" in inputs:
+                    extracted = (
+                        self._extract_texts_from_messages(
+                            redacted,
+                        )
+                    )
+                    if extracted:
+                        inputs["texts"] = extracted
 
         return inputs
 

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

@@ -375,6 +375,37 @@ class TestPromptGuardRedactAction:
             assert result["structured_messages"] == redacted
             assert "My SSN is *********" in result["texts"]
 
+    @pytest.mark.asyncio
+    async def test_redact_structured_only_does_not_create_texts(
+        self, promptguard_guardrail, mock_request_data
+    ):
+        """When only structured_messages are provided, redact should not inject a texts key."""
+        original = [
+            {"role": "user", "content": "My SSN is 123-45-6789"},
+        ]
+        redacted = [
+            {"role": "user", "content": "My SSN is *********"},
+        ]
+        resp = _make_response(
+            {
+                "decision": "redact",
+                "event_id": "evt-009",
+                "redacted_messages": redacted,
+            }
+        )
+        with patch.object(
+            promptguard_guardrail.async_handler,
+            "post",
+            return_value=resp,
+        ):
+            result = await promptguard_guardrail.apply_guardrail(
+                inputs={"structured_messages": original},
+                request_data=mock_request_data,
+                input_type="request",
+            )
+            assert result["structured_messages"] == redacted
+            assert "texts" not in result
+
     @pytest.mark.asyncio
     async def test_redact_texts_only_without_structured(
         self, promptguard_guardrail, mock_request_data