Robert Youssef(@rryssf)

People losing so much tokens and have no idea about this: Subagent caches expire in five minutes. In Claude Code, a subagent that sits idle longer than 5 minutes loses its prompt cache. The next call rewrites the whole context from scratch and burns several times more tokens than a cache hit would. Anthropic's guide covers a single setting that stretches that window to an hour: "subagentPromptCacheTtl": "1h" The trade-off is in the write price. Each write to the 1-hour cache costs more than a write to

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People losing so much tokens and have no idea about this: Subagent caches expire in five minutes. In Claude Code, a subagent that sits idle longer than 5 minutes loses its prompt cache. The next call rewrites the whole context from scratch and burns several times more tokens than a cache hit would. Anthropic's guide covers a single setting that stretches that window to an hour: "subagentPromptCacheTtl": "1h" The trade-off is in the write price. Each write to the 1-hour cache costs more than a write to

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Robert Youssef on X: "People losing so much tokens and have no idea about this: Subagent caches expire in five minutes....

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Robert Youssef on X: "许多人因不了解这一机制而损失了大量token：Subagent缓存5分钟后过期。在Claude Code中，闲置时间超过5分钟的Subagent会丢失其提示缓存。下一次调用将从头开始重写整个上下文，消耗的token数量是缓存命中情况下的数倍…… / X

Robert Youssef

@rryssf

许多人因不了解这一机制而损失了大量token：Subagent缓存5分钟后过期。在Claude Code中，闲置时间超过5分钟的Subagent会丢失其提示缓存。下一次调用将从头开始重写整个上下文，消耗的token数量是缓存命中情况下的数倍。Anthropic的指南中提到了一个可将该时间窗口延长至1小时的配置项："subagentPromptCacheTtl": "1h"。代价体现在写入成本上：写入1小时缓存的费用高于写入5分钟缓存。但好处是，当Subagent暂停时，你无需每次都支付完整重写费用。对于Subagent调用间隔较长的工作流，据称可节省高达总token消耗25%的费用。这些节省效果高度依赖于你的使用方式：如果Subagent执行速度快且很少闲置超过5分钟，你将为更贵的写入操作支付不必要的费用，账单反而会上升。切换配置前请先检查自己的使用情况。已存在一个对比脚本，可估算1小时TTL在你的实际会话中是节省开支还是增加成本。如果暂停时间保持在5分钟以内，请保留默认设置。

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9:33 AM · Oct 13, 2026

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