Agent code quality may look worse to a human observer, but in my experience agent build quality is better.
Features have less bugs on launch and tend to "just work", whereas human-driven builds always tended to be myopic and fail for embarrassing reasons.
It takes a while to build the confidence, but there's no future where you're manually reviewing every line of agent code. Not much acceleration in that. You need adversarial agent reviews, you need automated testing, and maybe you spot check. That's it. From prompt to production!