(It's not part of the free version since that works with your existing agent and you interact with it however you normally would).

The message stack in the bottom are the agent replies as it works. The idea is to move away from an array of messages as the primary interface with an agent and instead make the tools the primary interface. Whether that's actually helpful is an open question but it's certainly how I prefer to work now that I've been building with it.

I see, that makes sense. Though I personally think the UI could use a little bit of a touch up.