Stop “vibe testing” your LLMs. It's time for real evals. If you’re building with LLMs, you know the drill. You tweak a prompt, run it a few times, and... the output feels better. But is it actually better? You're not sure. So you keep tweaking, caught in a loop of “vibe testing” that feels more like art than engineering. This uncertainty exists for a simple reason: unlike traditional software, AI

