The body is lean with no padding or explanation of concepts Claude already knows; every section (tokens, shapes, patterns, tuning, avoid, quick checks) earns its place and assumes competence.

Provides complete, copy-paste-ready CSS including clip-path polygon definitions, design tokens, bordered shell and button patterns, and focus-visible states, all directly executable.

As a single-purpose pattern-reference skill with no destructive multi-step operation, the unambiguous organization plus "Quick Checks" and "Avoid" sections serve as clear validation guidance, meeting the simple-skill allowance for a top score.

No bundle files are present (references/scripts/assets are empty), and the skill is well-organized into focused sections; per the simple-skill guidance, well-organized sections alone justify a top score without external references.

"Apply diagonal-cut corners and chamfered edges to buttons, cards, panels, and container shells" lists multiple concrete actions across named surface types, matching the anchor for listing several specific concrete actions.

It explicitly answers what ("Apply diagonal-cut corners and chamfered edges to buttons, cards, panels, and container shells") and when ("Use when a design needs precise geometric framing, sci-fi UI surfaces, clipped-corner controls...") with an explicit trigger clause.

Natural design vocabulary like "sci-fi UI surfaces", "clipped-corner controls", "chamfered edges", and "rounded pills or plain rectangles" covers terms a user would actually say, rather than technical jargon.

The geometric corner-cutting niche is clearly framed against rounded pills and plain rectangles, making it unlikely to trigger for unrelated styling skills.