Stop shortening prompts: 6 agents achieve 97-99% cache hit rate
Icy_Comfort_6220 · reddit · 2026-08-27
The author runs an automated publication with six agents (CEO, Researcher, Writer, etc.) and spends $115/month on APIs after enabling prompt caching. The core insight: once caching works, a long, stable prompt is cheaper than a short one that changes constantly. The author achieved 97-99% cache hit rates by placing stable instructions at the top and volatile tasks at the bottom. This approach saved more costs than prompt-trimming and prevented agent performance degradation caused by removing rules.
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