What LLM Evals Actually Are (and Why 'Looks Good to Me' Isn't a Strategy)
A lot of teams building on top of LLMs ship a prompt, look at a handful of outputs, decide it "seems good," and move on. That works right up until a model update, a prompt tweak, or an edge case quietly breaks something nobody's testing for. Evals are the fix — the same instinct that gives you unit tests and regression tests for regular code, applied to something that doesn't produce the same output twice.