[Question]why add a assistant message after read from inbox

[kam1kaze1998]

In s9s10 agent_loop why add a assistant message that says "Noted inbox messages" after read from inbox, what happens if that message is not added

if inbox:
      messages.append({
          "role": "user",
          "content": f"<inbox>{json.dumps(inbox, indent=2)}</inbox>",
      })
      messages.append({
          "role": "assistant",
          "content": "Noted inbox messages.",
      })