Agent Mode lets Queen actually take actions on your behalf within the conversation — for example, creating a draft challenge based on what you've described, rather than just telling you how you'd do it yourself. You'll typically still get a chance to review anything Queen is about to create or change before it's finalized.
Agent Mode is scoped to what you've asked it to do in that conversation — it doesn't act autonomously in the background or take actions you haven't discussed.
