"So how does an AI model know its work is done? For now, it doesn’t. It stops when the budget runs out or when a check we designed says enough, and both of those need to be built. The systems that matter will not be the ones that can keep going. They all can. They will be the ones whose builders decided, precisely and in advance, what done costs and what done means." a16z's Yoko Li on loop engineering: https://a16z.news/p/knowing-when-to-stop…