Don't Ship Skills Without Evals

There are thousands agent skills. Almost none of them are tested. They get vibe-checked with two manual runs, maybe a thumbs-up from a colleague, then shipped. You wouldn't merge code without tests — so why are we shipping skills without evals? This talk covers the full lifecycle of building reliable agent skills: what a skill actually is (and isn't), how to write one that triggers correctly, and how to build a lightweight eval harness that catches failures before your users do.