getattr(u,'cache_read_input_tokens',None) 对 M3 的 ChatUsage 抛 KeyError(缺字段时抛 KeyError 而非 AttributeError,默认值兜不住)→ design 阶段首次 M3 调用即崩。改:每个 usage 字段经 _ug() try(KeyError/AttributeError/TypeError)安全取。 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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