When you hand off the next task, a role name alone is not enough. You need to know whether that role can still work, how much capacity remains, and whether its reasoning level and permissions fit what you are about to ask it to do.
When you add another way to run an AI agent, you should get more choice—not another installation, another sign-in, or another credential to look after.
As your project grows, the conversation should not get heavier every time you ask for the next step. You still need earlier work when you want it, without forcing every new reply to carry the whole history.
Editing a project file in place is useful only if you can trust what happens when you save. You should not lose newer work, end up with a half-written file, or forget where imported reference material came from.
When multiple AI agents work on the same project, the challenge is not adding more models. It is keeping roles clear, handoffs traceable, files controlled, and project context intact as the work moves forward.