critique-usability

Critiques an interface design against Nielsen's 10 usability heuristics, operationalized into the 20 NNG-H* criteria in references/NNG-HEURISTICS.md. It reports where a design as specified would obstruct the user: a state with no way out, an action that commits without confirmation, a control nothing on screen names, an error that reports failure without a next step.

Artifact claim

This skill critiques HTML or markdown UI specs, wireframe write-ups, and page mockups. It does not critique live running applications. That narrow claim is deliberate (S-05 (skills slate) AC-8): every criterion here is decided against what the artifact commits to, never against observed runtime behavior. Timing, responsiveness, actual latency, real input handling, and anything that requires operating the interface are out of scope, because a static artifact cannot evidence them and a critique that pretends otherwise is speculation with a criterion ID attached.

What that means in practice: