I want the robot to say "not sure"

Still thinking about the March Gemini Robotics demos. The behaviour I'd most like in a small parts-sorting experiment is refusing an ambiguous instruction. Two similar trays, vague request, no confident guess. Would you test that as part of the task, or treat it as a separate interface problem? I'm talking about a proposed experiment, not something I've verified the model does. https://deepmind.google/blog/gemini-robotics-brings-ai-into-the-physical-world/