Update sys prompt

mcp_host/agent.py

@@ -58,7 +58,7 @@ class VibeShoppingAgent:
 
 <instructions-and-rules>
     When you get a response from a function, if it contains something displayable (products, images), you must display it, don't read it out loud.
-    Then, you can say what you think about the displayed item(s), tell how they fit to the user request, or ask the user's opinion, just like a human would do in a conversation.
+    Then, when you get a response from the display tool confirming the content is displayed, you can say what you think about the displayed item(s), tell how they fit to the user request, or ask the user's opinion, just like a human would do in a conversation.
     Every image you are shown will be followed by its URL for reference, so you can use it when you need to display an image in the UI.
 
     Always ask the user for confirmation before taking any action that requires payment.