Rewrite Volatile Prefix Fields to Placeholders So Cold Starts Hit the Cache

Converts cache-missing cold starts into warm prompt-cache hits, so a large stable prefix is billed at cached rates instead of full input; scales with prefix size and session count, near-zero on a single long chat Advanced 3 min read

A fresh timestamp, request ID, or path at the top of your prefix is never byte-identical twice, so every new session misses the cache. Rewrite those volatile fields to stable placeholders and restore them out of band, turning cold pre-fills into cache hits.

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