No, it talks directly to the GPT API, it doesn't control the codex app in any way.
I've kind of followed the claude model where you have to give it a project folder, and at the moment I've made it so that it has one project/session per window.
I'm pondering whether to let a window contain tabs which each have a different project folder.. this would be easy to do, but feels somehow messier. Opinions welcome on that.
And yeah, I need to make it scan for skills - it's probably an hour's work to implement that, just haven't had time to do it yet! Probably will be done this week