Design for Cache Hits, Not Just Good Prompts

Reuse has to be structural Prompt caching is not a reward for having long prompts. It is a discount for having long, repeated prompt segments. Stable first, dynamic later Put policy text, instructions, schemas, and evergreen examples in the reusable prefix. Push case-by-case details, tool results, timestamps, and one-off notes later. That increases cache hit odds and preserves the discount. Why it works Cache-aware prompts lower input cost and often reduce latency. They also make routing easier because smaller models can inherit the same disciplined prefix structure.

Sign up free — one personalized lesson every day, matched to your role and goals.

Already have an account? Sign in