分层 agent 架构：Jev 路由廉价决策
一份指南讲常驻 agent 如何分层：Jev 处理廉价判断，Sol 做日常活，Astra 接难题，代码控制可执行动作，人来批准不可逆操作。
THE BEST AI AGENT MIGHT BE THE ONE THAT KNOWS WHEN NOT TO USE THE BEST MODEL. An always-on agent makes thousands of tiny decisions overnight. “Is this urgent?” “Should I retry?” “Does this need approval?” “Which worker should handle it?” Sending all of that to a frontier model is like hiring a surgeon to answer the receptionist’s phone. The architecture in this guide flips it: Jev routes the cheap decisions. Sol handles everyday work. Astra gets the genuinely hard problems. Code controls what can actually happen. Humans approve the irreversible. That changes the economics of autonomy. The goal isn’t a smarter agent. It’s an agent that knows when intelligence is worth paying for.
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