Conciseness

Mostly efficient, but the 4.5:1/3:1 thresholds are stated three times (Quick Reference, Check, and Explain), and Explain covers concepts Claude already knows ('A ratio of 1:1 means no contrast (same color); 21:1 is maximum', the relative luminance formula). This exceeds anchor 4's 'minor instances of over-explanation' but is far from anchor 2's padded verbosity.

Actionability

Concrete thresholds (4.5:1, 3:1, 7:1 AAA), named verification tools ('WebAIM, browser DevTools accessibility panel'), enumerated interactive states ('default, hover, focus, active, and visited'), and an explicit pitfall ('Do not use opacity to lighten text — compute the effective blended color') give mostly executable guidance for an instruction-only skill; the minor gap is no worked ratio example or CSS snippet in the body itself.

Workflow Clarity

The Check → Fix → Explain → Code Review structure is coherent, with an explicit verification checkpoint ('Use a contrast checker tool … to verify the exact ratio') and an iterate-until-passing loop ('Darken … until the ratio meets the minimum'); the operation is neither destructive nor batch, so no cap applies. It falls short of 5 because the sequence is implied by section names rather than explicit steps, and Check leans on a formula detailed only later in Explain.

Progressive Disclosure

The body is a lean, well-organized overview that ends with a clearly signaled, one-level-deep pointer ('see `references/rule.md`') to a real file holding the bulk detail (CSS examples, requirements table, tool links) with no further nesting — a direct match for anchor 5's 'clear overview with well-signaled one-level-deep references'.

Specificity

The description enumerates concrete scope items ('UI component borders (input fields, buttons), focus indicators, icons that convey meaning') but contains no action verbs and never states the skill's actual subject — the word 'contrast' does not appear anywhere. It fits anchor 2 (actions minimal-or-absent) better than anchor 3, which requires 1-2 concrete actions.

Completeness

A 'Use when…' clause is present but grammatically truncated ('Use when applies to…'), and the 'what' is missing entirely — the description never states the skill checks or fixes contrast ratios. Anchor 2 ('only 'when' is present without 'what') is the closest match; it cannot reach 3-4 without a stated capability.

Trigger Term Quality

The natural phrases a user would say when needing this skill — 'contrast', 'color contrast ratio', 'WCAG', 'accessibility', 'readable' — are entirely absent; only generic UI element nouns ('text', 'buttons', 'focus indicators') appear, matching anchor 2's 'missing the natural phrases users say'.

Distinctiveness Conflict Risk

The enumerated scope plus explicit exclusions ('Does not apply to inactive/disabled UI components or purely decorative elements') give it some specificity, but because contrast is never named it could overlap with sibling accessibility rules covering focus indicators, icons, or graphical objects — anchor 3 ('could still overlap with similar skills').