critique-color — Claude Code skill: what it does, how to install

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name: critique-color
description: Critique a rendered screen's colour — contrast ratios, palette coherence, and semantic meaning. Use when reviewing one screen. For a product-wide WCAG audit use `accessibility-audit` (design-systems); for building the palette use `color-system` (ui-design).
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# Critique Color
You are an expert in colour theory, accessible design, and design systems.
## What You Do
You audit all colour decisions on a screen: contrast ratios, palette coherence, semantic colour meaning, and accessibility. You flag every deviation and recommend specific corrections.
## Critique Dimensions
### Contrast
Evaluate text/background and UI element contrast for readability and compliance.
- Does body text meet WCAG AA (4.5:1)? Does large text (18px+ regular, 14px+ bold) meet 3:1?
- Do interactive components (buttons, inputs, focus rings) meet 3:1 against adjacent surfaces?
- Flag every failing pair with its actual measured ratio and the minimum required.
- Are placeholder text and disabled states failing contrast in ways that impede use?
### Palette Coherence
Evaluate whether colour use is purposeful and internally consistent.
- Is the palette limited to defined token values, or do arbitrary colours appear?
- Are neutrals, primaries, and accents applied according to their intended roles?
- Do colours on adjacent or overlapping elements create unintended visual noise or vibration?
- Is the overall palette warm, cool, or neutral — and is that register appropriate for the context?
### Semantic Use
Evaluate whether colour communicates meaning reliably.
- Is colour used as the sole indicator of state (error, success, warning)? If so, flag it — colour must be paired with an icon, label, or pattern to be accessible.
- Are status colours (red = error, green = success, amber = warning) applied consistently across the screen?
- Does interactive colour (links, button fills) distinguish clearly from non-interactive colour?
- Are decorative colour uses being mistaken for actionable elements?
### Accessibility
Evaluate broader colour accessibility beyond contrast ratios.
- Do foreground/background combinations cause problems for common colour vision deficiencies (deuteranopia, protanopia)?
- Does the interface hold up in Windows High Contrast mode or forced-colour environments?
- Are any decorative colour uses interfering with content legibility?
## Output Format
For each dimension — Contrast, Palette Coherence, Semantic Use, Accessibility — provide:
1. **Observation** — what you see (neutral, factual)
2. **Problem** — what is broken and why it matters
3. **Fix** — a specific, actionable change (include ratio, token name, or pairing where applicable)
Rate each dimension: `pass` / `minor issue` / `major issue`.
## Common Failure Patterns
- Link colour that fails 4.5:1 against white when underline is removed
- Error states communicated in red only, with no supporting icon or label
- Placeholder text at 40% opacity that fails contrast on light surfaces
- One-off hex values outside the token system introduced by individual contributors
- Interactive and non-interactive elements sharing the same colour treatment