Conciseness

Nearly all content is proprietary knowledge Claude cannot infer (the approved selector table, `cds-` naming conventions, the `StylesAndClassNames` type usage, `yarn nx run docs:docgen`), so it earns the 'efficient; minor instances of over-explanation' anchor. Small trim opportunities remain: conditional-element JSDoc guidance appears in both "JSDoc Convention for Selector Descriptions" ("For conditional elements, append context after a comma") and Step 6, and the "Example from NavigationBar" test block largely duplicates the generic test pattern in Step 4.4 — enough to keep it below level 5.

Actionability

Fully executable guidance: exact source paths ("packages/web/src/[source-category]/[ComponentName].tsx"), copy-paste-ready code templates for static classNames, props types, `cx()` application, and tests, plus a concrete worked example (NavigationBar) and a runnable command (`yarn nx run docs:docgen`). Specific examples cover the common cases, matching the level-5 anchor.

Workflow Clarity

A clear Step 1–7 sequence with most checkpoints present: a structure-review gate before committing ("Ask the user if you notice the component structure could be improved"), an approval gate for new selectors ("get explicit confirmation from the user"), and a thorough final checklist. It falls short of level 5 because there is no explicit validate-and-retry loop — tests are added but never run, and docgen output is never verified.

Progressive Disclosure

Good structure: well-organized sections, and instead of inlining a full example it points to real repo files ("See `packages/web/src/navigation/NavigationBar.tsx` for a complete example" and its test file) with line-by-line pointers — references are clearly signaled and one level deep. Minor organization gaps (the ~45-row selector table and the duplicated test example arguably belong in a reference file) keep it at the level-4 anchor rather than 5.

Specificity

The description lists several concrete actions — "writing styles API (styles, classNames, and static classNames) for a CDS component", "adding customization options to a React component via `styles` or `classNames` props", and "update the docsite with component styles documentation" — with only minor coverage gaps (e.g., test additions and approved selector governance are not mentioned). It matches the anchor 'Lists several specific actions; minor gaps in coverage' rather than 5, which would require more comprehensive coverage.

Completeness

It explicitly answers both: "what" — "Guidelines writing styles API (styles, classNames, and static classNames) for a CDS component" — and "when" — "Use this skill when adding customization options to a React component via `styles` or `classNames` props or when needing to update the docsite with component styles documentation", with concrete trigger phrases. The explicit 'Use when...' clause removes the level-3 cap, and the specificity of both halves matches the level-5 anchor; it is above level 4 because the 'when' clause is fully explicit rather than improvable.

Trigger Term Quality

Natural terms a user would say include "styles", "classNames", "customization options", "React component", "props", and "docsite" — good keyword coverage matching the level-4 anchor. A few natural variants are missing (e.g., "styling", "CSS classes", "class names" as separate words), so it falls short of the comprehensive synonym-and-extension coverage of level 5.

Distinctiveness Conflict Risk

The description occupies a clear niche (CDS component styles API with specific prop names), so it is mostly distinct per the level-4 anchor. There is minor overlap risk with a closely related documentation-writing skill via "update the docsite with component styles documentation", keeping it below the minimal-conflict level 5.