You should probably be deferring to the agent on nearly all architecture decisions; it's trained on a lot more architectures than you'll ever see in your life, and it does a better job of designing architectures for common problems than many engineers at this point.

You have to ask it to consider the architecture, or it'll cut the shortest path to any solution, but if you ask it, it'll come up with likely a better approach than you would have invented.

Your job is mostly to ask it to think about all the aspects, and then do manual testing on the output. The agent can take care of the rest.