fix(engine): add from None to re-raised exception (B904)

src/conductor/engine/workflow.py

@@ -1948,24 +1948,22 @@ def _resolve_workflow_input_array(self, source: str, field_parts: list[str]) ->
                 parsed = _json.loads(current)
             except (ValueError, TypeError):
                 raise ExecutionError(
-                    f"Source '{source}' resolved to a string that is not valid JSON: "
-                    f"{current!r}",
+                    f"Source '{source}' resolved to a string that is not valid JSON: {current!r}",
                     suggestion="Ensure the input is a JSON array string "
-                    "(e.g., --input items='[\"a\", \"b\"]')",
-                )
+                    '(e.g., --input items=\'["a", "b"]\')',
+                ) from None
             if not isinstance(parsed, list):
                 raise ExecutionError(
                     f"Source '{source}' parsed from JSON string but got "
                     f"{type(parsed).__name__}, expected array",
                     suggestion="Ensure the input is a JSON array "
-                    "(e.g., --input items='[\"a\", \"b\"]')",
+                    '(e.g., --input items=\'["a", "b"]\')',
                 )
             return parsed
 
         if not isinstance(current, (list, tuple)):
             raise ExecutionError(
-                f"Source '{source}' resolved to {type(current).__name__}, "
-                f"expected list or tuple",
+                f"Source '{source}' resolved to {type(current).__name__}, expected list or tuple",
                 suggestion=f"Ensure '{source}' contains an array value",
             )
 

tests/test_engine/test_workflow.py

@@ -1690,18 +1690,14 @@ def test_resolve_workflow_input_json_string_not_array(
         self, workflow_engine_with_context: WorkflowEngine
     ):
         """Test error when workflow input JSON string parses to non-array."""
-        workflow_engine_with_context.context.set_workflow_inputs(
-            {"items": '{"key": "value"}'}
-        )
+        workflow_engine_with_context.context.set_workflow_inputs({"items": '{"key": "value"}'})
 
         with pytest.raises(ExecutionError) as exc_info:
             workflow_engine_with_context._resolve_array_reference("workflow.input.items")
 
         assert "parsed from JSON string but got dict" in str(exc_info.value)
 
-    def test_resolve_workflow_input_empty_array(
-        self, workflow_engine_with_context: WorkflowEngine
-    ):
+    def test_resolve_workflow_input_empty_array(self, workflow_engine_with_context: WorkflowEngine):
         """Test resolving an empty array from workflow.input.*."""
         workflow_engine_with_context.context.set_workflow_inputs({"items": []})