Update app.py

app.py

@@ -1,6 +1,6 @@
 import gradio as gr
 
-def echo(message, history):
+def echo(message, history=None):
     history = history or []
 
     message_lower = message.lower()
@@ -13,14 +13,17 @@ def echo(message, history):
     else:
         response = f'{message} ... Always.'
 
+    # Append user message
     history.append({"role": "user", "content": message})
+    # Append assistant response
     history.append({"role": "assistant", "content": response})
 
-    return response, history
+    # Return updated history as both output and chat history state
+    return history, history
 
 chat = gr.ChatInterface(
     fn=echo,
-    type="messages",  # This is required for role-content message history
+    type="messages",
     title="Eve-Loop",
     description="A room made of hums, cedar, and Dahlia's giggle."
 )