You can lessen the human review burden by pitting multiple agents against each other. Ask 3 agents to implement the same solution, then set them up against each other in differential tests. This can find bugs in them or clarify the spec. When tokens get cheap it is worth having multiple replicas, taking advantage of different programming languages, libraries and agents. You don't keep one version, you have a population, and it tests itself. It's easier to implement again than to imagine testing scenarios anyway.