Conciseness

The body is lean and assumes competence ('Keep SKILL.md minimal: usage instructions and a table linking to topics'), but the sentence 'In addition, there are a set of topics below that may be used for guidance on a specific topic. Consult this to see if any apply to the task at hand.' is pure filler the table already conveys. Minor trimmable over-explanation matches anchor 4 rather than anchor 5's 'every token earns its place'.

Actionability

For an instruction-only skill the guidance is concrete and executable: 'read `contributor-docs/style.md` and apply the guidelines that are relevant', a decision table mapping tasks to specific topic docs, and the explicit rule 'If a change intentionally deviates from the style guide, call out the reason.' It falls short of fully actionable because all substantive guidance is delegated to external files with no inline summary or example to act on.

Workflow Clarity

A simple, single-purpose skill under 50 lines whose single action is unambiguous: read the style guide before authoring, apply principles when proposing/implementing/reviewing, consult topic docs when applicable, flag intentional deviations. No destructive or batch operations, so no validation checkpoint is required; the simple-skill exception applies.

Progressive Disclosure

Exemplary index structure — a minimal SKILL.md, well-signaled one-level-deep references in a topic table ('[component-prop-naming](./docs/component-prop-naming.md)'), and an explicit policy to keep detailed guidance in topic files. Held below anchor 5 because none of the referenced files (`contributor-docs/style.md`, `docs/component-prop-naming.md`, `docs/component-prop-types.md`) exist in the provided bundle, so the disclosure chain cannot be verified or completed.

Specificity

Names a concrete domain ('Primer React components, hooks, utilities, or component APIs') with specific trigger activities ('authoring, modifying, or reviewing'), but states no capability at all — nothing describes what the skill does. That is a major coverage gap rather than anchor 4's 'minor gaps', so it lands at anchor 3 (domain named, concrete actions present, not comprehensive).

Completeness

The 'when' is explicit and concrete ('Use when: authoring, modifying, or reviewing Primer React components...'), but the 'what' is entirely absent — the description never states what the skill does. This exactly matches anchor 2 ('only when is present without what', example 'Use when working with documents'); it cannot score 3 because that anchor requires a clear 'what'.

Trigger Term Quality

'authoring', 'modifying', 'reviewing', 'components', 'hooks', 'utilities', and the distinctive 'Primer React' are natural terms a user working in this repo would say. A few natural synonyms are missing ('creating', 'writing', 'editing', 'props', 'styling'), so it matches 'good keyword coverage; a few natural terms missing' rather than the comprehensive synonym coverage of anchor 5.

Distinctiveness Conflict Risk

'Primer React' is a clear niche trigger; virtually no other skill would fire on this description. Distinct triggers and minimal conflict risk match anchor 5; anchor 4's 'minor overlap risk with closely related skills' does not apply.