UnavailableChannel
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headless 缺省通道:任何提问立即失败,由 AskUser 工具转成降级 isError 文案
new UnavailableChannel(): UnavailableChannel;UnavailableChannel
ask(_questions, _signal): Promise<Answer[]>;向用户提出一批问题,resolve 为对应答案。
- signal 中止 → reject(AbortError 形状);
- 通道不可用 → reject ChannelUnavailableError。
_questions
Section titled “_questions”readonly Question[]
_signal
Section titled “_signal”AbortSignal
Promise<Answer[]>
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