contrast-checker

# Contrast Checker Skill ## Purpose Calculate and validate color contrast ratios according to WCAG 2.1 guidelines, ensuring text readability and accessibility compliance. ## Capabilities - Calculate WCAG contrast ratios - Validate normal text (4.5:1) and large text (3:1) requirements - Check AA and AAA compliance levels - Suggest passing color alternatives - Batch check multiple color pairs - Analyze color palettes for contrast issues ## Target Processes - accessibility-audit.js (colorContrastVisualAnalysisTask) - component-library.js (colorSystemDesignTask) - design-system.js ## Integration Points - color-contrast-checker library - polished.js - chroma.js ## Input Schema ```json { "type": "object", "properties": { "colorPairs": { "type": "array", "items": { "type": "object", "properties": { "foreground": { "type": "string" }, "background": { "type": "string" }, "textSize": { "type": "string", "enum": ["normal", "large"] } } } }, "targetLevel": { "type": "string", "enum": ["AA", "AAA"], "default": "AA" }, "suggestAlternatives": { "type": "boolean", "default": true }, "palette": { "type": "object", "description": "Color palette to analyze for contrast" } }, "required": ["colorPairs"] } ``` ## Output Schema ```json { "type": "object", "properties": { "results": { "type": "array", "items": { ...