That kills iteration speed. Carefully outline, get it to write tests first, then let it go wild and verify the tests while it's doing that. If there are test issues, tell it so without interrupting it, and it'll just queue up those fixes without having to stop and be re-routed.

You want to periodically have coverage improvement -> refactor loops after implementing a few features. You can figure out the refactors you want while the agent is implementing the code, after you've sussed out any test issues, then just queue up instructions on how to refactor once the tests are passing.