Fix builder panel chatbot format conversion for Gradio 4.20.0

app.py

@@ -1069,7 +1069,8 @@ def build_ui():
                         prompt = f"Please provide the following required information for empiric therapy: {', '.join(missing)}."
                         # Show this as an assistant message and do not call the tool
                         history.append({"role": "assistant", "content": prompt})
-                        return history, histories, ""
+                        gradio_history = convert_messages_for_gradio(history)
+                        return gradio_history, histories, "", "", ""
                     # All required fields present, prepend tool input
                     user_text = f"[EMPIRIC_THERAPY_INPUT] {json.dumps(user_vars)}\n" + user_text
             # Use the same chat handling logic, but ensure the builder_chatbot is updated and history is preserved
@@ -1100,12 +1101,14 @@ def build_ui():
                 else:
                     final_history, updated_histories, cleared_input, invocation_log = chatpanel_handle(agent_name, user_text, histories)
                     challenger_info = None
-                    return final_history, updated_histories, cleared_input, invocation_log, ""
+                    gradio_history = convert_messages_for_gradio(final_history)
+                    return gradio_history, updated_histories, cleared_input, invocation_log, ""
             except Exception:
                 # fallback to old behavior if error
                 final_history, updated_histories, cleared_input, invocation_log = chatpanel_handle(agent_name, user_text, histories)
                 challenger_info = None
-                return final_history, updated_histories, cleared_input, invocation_log, ""
+                gradio_history = convert_messages_for_gradio(final_history)
+                return gradio_history, updated_histories, cleared_input, invocation_log, ""
             # Update histories
             updated_histories = histories.copy()
             updated_histories[agent_name] = final_history
@@ -1127,7 +1130,10 @@ def build_ui():
                     challenger_md = f"**Original Agent Answer:**\n\n{orig}\n\n**Challenger Critique:**\n\n{crit}\n\n**Final Answer Shown to User:**\n\n{final}"
                 else:
                     challenger_md = f"**Original Agent Answer:**\n\n{orig}\n\n**Final Answer Shown to User:**\n\n{final}"
-            return final_history, updated_histories, "", invocation_log, challenger_md
+            
+            # Convert final_history to Gradio format before returning
+            gradio_history = convert_messages_for_gradio(final_history)
+            return gradio_history, updated_histories, "", invocation_log, challenger_md
 
         # Add a Markdown for challenger debug info under the invocation log, only in the builder panel
         challenger_debug_md = gr.Markdown("", visible=True)