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    <title>Coding Agent on CJ&#39;s Blog</title>
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      <title>Prompt Caching In Agents[中译]</title>
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      <description>翻译自 Earendil Engineering《Prompt Caching In Agents》。对编码 Agent 来说，缓存行为不只是实现细节或优化，它影响延迟、成本、工具设计、会话设计，甚至决定哪些产品功能该不该开放。本文以 Pi 为例，讲解 KV Cache 原理、缓存存放位置、前缀与分支、显式/自动缓存、工具装载为何毁掉缓存、TTL、缓存未命中的代价，以及 Pi 为何不激进裁剪历史。</description>
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