fix(foundry): preserve workflow failure causes

Author: Aitomates

src/cas_reference_product/workflow.py

@@ -56,8 +56,8 @@ def run(self, envelope: PromptEnvelope) -> str:
                         }
                     },
                 )
-            except Exception:
-                raise WorkflowAgentServiceError("Foundry workflow invocation failed") from None
+            except Exception as error:
+                raise WorkflowAgentServiceError("Foundry workflow invocation failed") from error
         return response.output_text
 
 

tests/test_service_factory.py

@@ -88,5 +88,10 @@ def test_foundry_service_sanitizes_sdk_failure(envelope: "Any") -> None:
         )
         service = FoundryWorkflowAgentService(settings)
 
-        with pytest.raises(WorkflowAgentServiceError, match="Foundry workflow invocation failed"):
+        with pytest.raises(
+            WorkflowAgentServiceError, match="Foundry workflow invocation failed"
+        ) as caught:
             service.run(envelope)
+
+    assert isinstance(caught.value.__cause__, RuntimeError)
+    assert str(caught.value.__cause__) == "sensitive provider detail"