Run long autonomous builds through a GAN-style generator/evaluator harness.

Anthropic's multi-hour harness splits work across planner, generator, and a skeptical evaluator, an architecture borrowed from GANs where the evaluator's adversarial feedback keeps output coherent over long sessions instead of drifting. Don't let one agent both produce and judge its own work. Stand up a separate evaluator, different prompt, ideally different model, whose only job is to challenge the generator before changes land. Source: Epsilla