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Your Subagents Forget in Five Minutes: Prompt Cache TTL in Claude Code

On a Claude Code subscription the main conversation caches for an hour, but subagents get five minutes. Here is when that costs you a full prefix rewrite, and how to raise it.

12 Oct 2026 · 6 min read ·3 views

#claude-code
#llm-costs
#prompt-caching
#subagents