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I thought prompt caching was free money until my agent stack broke it on every single call

This story is from 2026-09-22. It is preserved in the archive; the latest stories are on the live feed.

I had an agent workflow that looked like a perfect prompt-caching candidate. Same developer prompt. Same tools. Same task shape. Long static instructions. On paper, it should have gotten cheaper over time. It didn’t. Every request behaved like a fresh request. That sent me down a rabbit hole, and t…

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  1. 2026-09-22 06:09 · DEV Community — AI
    I thought prompt caching was free money until my agent stack broke it on every single call

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