Prompt Caching Review — Reviews ONE Claude API request (tools, system, messages, the cache marks, the model, the sizes and how often it is sent) for the five reasons its prompt cache does not pay off, and lists only those, one line each with a fixed code, the place, why the cache misses and the fix - or exactly No findings. It catches text that changes on every call (a clock, a request id, a user name) at or before the cache mark, a large stable prefix with no mark, a marked prefix shorter than…

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