Update app.py

app.py

@@ -184,7 +184,10 @@ def generate_tool_outputs(tool_call_ids, tool_call_results):
     for tool_call_id, tool_call_result in zip(tool_call_ids, tool_call_results):
         tool_output = {
             "tool_call_id": tool_call_id,
-            "output": tool_call_result.to_json()
+            "output": try:
+                          tool_call_result.to_json()
+                      except AttributeError:
+                          tool_call_result
         }
     
         tool_outputs.append(tool_output)