Conciseness

The ~30-line body is lean and directive (Quick Reference bullets, Check/Fix/Explain/Code Review sections) and defers all code and framework detail to references/rule.md. The one over-explanation is the motivational opener 'Skip links save keyboard and screen reader users from tabbing through 50+ navigation items...' — context Claude already knows, and which is repeated verbatim in references/rule.md — so it could be trimmed, but this is a minor instance rather than pervasive padding.

Actionability

The Quick Reference bullets are concrete and executable: 'Add a Skip to main content link as the first focusable element', 'Hide visually but show on focus with CSS', 'Link to main content using id=main-content', 'Test by pressing Tab immediately after page load'. It is not a 5 because the Fix section itself stays high-level ('Add a visually hidden skip link that becomes visible on focus') with no inline markup example — all code is deferred to the reference file — leaving minor gaps.

Workflow Clarity

This is a simple, single-purpose skill and the sequence is unambiguous: Check (verify the link is present and functional) → Fix (add the visually hidden, focus-visible link) → verify ('Test by pressing Tab immediately after page load'), with deeper Verification steps (Tab, Enter, focus moves to main content, screen reader announcement) in references/rule.md. No destructive or batch operations are involved, so no validation cap applies.

Progressive Disclosure

The body is a concise overview with a clearly signaled, one-level-deep reference — 'For full implementation details, code examples, and framework-specific guidance, see references/rule.md' — and the referenced file exists in the bundle (references/rule.md, containing the code example, CSS, framework examples, exceptions, and verification steps). Structure and navigation are clean with no inlining of content that belongs in the reference.

Specificity

The description lists several concrete review actions — 'Check native semantics first, then inspect keyboard behavior, focus flow, accessible names, and screen-reader output' — giving it strong, specific capability language. It stops short of a 5 because it covers only inspection; the remediation outcome (verify/fix the skip link) is only implied by the awkwardly embedded rule title 'related to Include a skip navigation link'.

Completeness

Both parts are present: an explicit 'Use when reviewing rendered HTML, interactive components, or design-system patterns...' trigger clause, and a 'what' expressed through the concrete check/inspect actions. It is not a 5 because the core capability — auditing and fixing a skip navigation link — is stated indirectly via the capitalized rule title ('related to Include a skip navigation link') rather than as a clear, grammatical statement of what the skill does.

Trigger Term Quality

Good keyword coverage including 'rendered HTML', 'interactive components', 'design-system patterns', 'keyboard behavior', 'focus flow', and 'screen-reader output' — phrases a user doing a frontend a11y review would plausibly say. A few natural terms are missing: the common shorthand 'skip link', 'skip to main content', and the words 'accessibility'/'a11y' themselves.

Distinctiveness Conflict Risk

Naming 'skip navigation link' gives the skill a clear niche with minimal conflict risk against unrelated skills. Minor overlap remains with sibling accessibility-review skills that would share the same generic 'Use when reviewing rendered HTML, interactive components, or design-system patterns...' boilerplate trigger, making it mostly rather than fully distinct.