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ReAct 那类思路更像单 agent 内部的思考和行动交替，不等于说生产里必须多角色化。
Playwright 的 trace 很有用。失败时别只存最后截图，trace 能看每一步 DOM、网络和截图。
输出预算也别忘。很多人只算输入，结果模型回答到一半被截断，用户看到半句 SQL。
