Armin Ronacher ⇌(@mitsuhiko):We've recently made Pi's cache behavior more visible. This site has been debating whether agent harnesses are helping or quietly torching their caches. That seemed like a good excuse to explain how KV caches actually work and how Pi helps (or doesn't).

Armin Ronacher ⇌

@mitsuhiko

Creator of Flask. Building at Bypassing Permissions. Can hand crank. Husband and father of 3 — “more nuanced in person”

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Armin Ronacher ⇌@mitsuhiko

2026.07.23 10:47

We've recently made Pi's cache behavior more visible. This site has been debating whether agent harnesses are helping or quietly torching their caches. That seemed like a good excuse to explain how KV caches actually work and how Pi helps (or doesn't).