The prompt was:
Ultrathink. You're a principal engineer. Do not ask me any
questions. We need to improve the quality of this codebase.
Implement improvements to codebase quality.
I'm a little disappointed that Claude didn't eventually decide to start removing all of the cruft it had added to improve the quality that way instead.
Yeah, the best it did on some iterations is claimed that the codebase was already in the good state and didn't produce changes - but that was 1 in many.