---
name: contrast-checker-3b9722c5612b
description: Check color contrast ratios for WCAG compliance
allowed-tools:
  - Read
  - Write
  - Edit
  - Bash
  - Glob
  - Grep
graph:
  domains: [domain:web-development]
  specializations: [specialization:ux-ui-design]
  skillAreas: [skill-area:accessibility-first-design, skill-area:color-theory]
  roles: [role:product-designer, role:qa-engineer]
  workflows: [workflow:user-feedback-loop, workflow:product-discovery]
---

# 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": {
        "type": "object",
        "properties": {
          "foreground": { "type": "string" },
          "background": { "type": "string" },
          "ratio": { "type": "number" },
          "passesAA": { "type": "boolean" },
          "passesAAA": { "type": "boolean" },
          "passesAALarge": { "type": "boolean" },
          "alternatives": { "type": "array" }
        }
      }
    },
    "summary": {
      "type": "object",
      "properties": {
        "totalPairs": { "type": "number" },
        "passingAA": { "type": "number" },
        "passingAAA": { "type": "number" },
        "failing": { "type": "number" }
      }
    },
    "paletteAnalysis": {
      "type": "object",
      "description": "Full palette contrast matrix"
    }
  }
}
```

## Usage Example

```javascript
const result = await skill.execute({
  colorPairs: [
    { foreground: '#333333', background: '#ffffff', textSize: 'normal' },
    { foreground: '#666666', background: '#f0f0f0', textSize: 'large' }
  ],
  targetLevel: 'AA',
  suggestAlternatives: true
});
```


---
Source attribution: a5c-ai
Original project: https://github.com/a5c-ai/babysitter
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Dave AI.

## Upstream license notice

MIT License

Copyright (c) 2026 Gabriel Moreira

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Dave AI resource metadata

Creator / publisher: a5c-ai
Original project: https://github.com/a5c-ai/babysitter
Attribution basis: Upstream repository explicitly recorded in package mirror path

Fields of work: Design, Development & Engineering
Roles: Frontend Developer, Product Designer, UX Designer
Specialties: Cross Platform, Design, Frontend
Tools: Color Contrast Checker
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: b442037166da9f32194c6ae845ee64eed7020e8fd754a3bfd771f2a4f820250d