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      <description>AI Agent 工程化实践复盘：架构设计、容错与可靠性、上下文工程与成本治理。</description>
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    <description>以 OpenAI 文生图 API 为例，解析生成请求与图片下载为什么必须是两个独立重试状态机：关键差异在计费语义——一个是未确认态可能重复扣费，一个是已付费的幂等免费操作。</description>
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