For me it's usually that I start with a single agent, but then I won't have anything to do while it is churning and I have other ideas/features that keep building up that I want to do, so I need to scale, and while I'm scaling I need to start to have those workflows, so eventually I end up with many agents, most which are autonomous working on their own worktrees, but I will have a specific agent that I will talk to more iteratively.

So e.g. I may have 1 agent that I ask and iterate on with directly, and 9 agents that work separately on their own.

I will utilize this 1 agent on features I care most about and want to guide and iterate on in as much detail as possible.