contrast-check
Check color contrast ratios for WCAG accessibility compliance. Use when: auditing UI components for accessibility, validating color schemes meet AA/AAA standards, fixing low-contrast text in designs.
What this skill does
# Contrast Check
## Overview
Check color pairs against WCAG 2.1 contrast requirements. Pass in hex colors and get contrast ratios with AA/AAA pass/fail results for both normal and large text.
- Checking if a text color is readable against a background color
- Auditing an entire color palette for accessibility compliance
- Verifying colors extracted from a design meet WCAG standards
## Instructions
1. Takes a list of hex colors as arguments
2. Computes the contrast ratio for every foreground/background pair
3. Tests each pair against WCAG 2.1 AA and AAA thresholds for normal and large text
WCAG thresholds:
- **AA normal text** — ratio >= 4.5:1
- **AA large text** — ratio >= 3:1
- **AAA normal text** — ratio >= 7:1
- **AAA large text** — ratio >= 4.5:1
Run the script with two or more hex colors (with or without `#` prefix):
```bash
bash <skill-path>/scripts/contrast-check.sh <color1> <color2> [color3] [color4] ...
```
The script outputs JSON with contrast ratios and pass/fail results:
```json
{
"pairs": [
{
"foreground": "#1a1a2e",
"background": "#ffffff",
"ratio": 16.57,
"aa": { "normal": true, "large": true },
"aaa": { "normal": true, "large": true }
}
],
"summary": {
"totalPairs": 2,
"passAA": 1,
"passAAA": 1,
"failAA": 1
}
}
```
After checking, present a table to the user:
```
Contrast Check Results:
#1a1a2e on #ffffff — 16.57:1 — AA: Pass — AAA: Pass
#e94560 on #ffffff — 3.94:1 — AA: Fail (normal) / Pass (large) — AAA: Fail
Summary: 1/2 pairs pass AA for normal text, 1/2 pass AAA.
```
Flag any failing pairs and suggest fixes (darken/lighten the color to reach the threshold).
## Examples
### Example 1: Check a dark theme header against white text
```bash
bash <skill-path>/scripts/contrast-check.sh "#1a1a2e" "#ffffff"
```
Output:
```json
{
"pairs": [
{
"foreground": "#1a1a2e",
"background": "#ffffff",
"ratio": 16.57,
"aa": { "normal": true, "large": true },
"aaa": { "normal": true, "large": true }
}
],
"summary": { "totalPairs": 1, "passAA": 1, "passAAA": 1, "failAA": 0 }
}
```
### Example 2: Audit a full brand palette
```bash
bash <skill-path>/scripts/contrast-check.sh "#1a1a2e" "#e94560" "#ffffff" "#3d83f7" "#bdbdbd"
```
The script checks all foreground/background combinations and reports which pairs fail AA or AAA. For example, `#e94560` on `#ffffff` yields a ratio of 3.94:1 which fails AA for normal text but passes for large text.
## Guidelines
- Colors must be valid hex values (3 or 6 digits, with or without `#`).
- Pair with the `image-analysis` skill to extract colors from a design first, then pipe the hex values into this skill to audit accessibility.
- When a pair fails, suggest darkening or lightening one of the colors to meet the target ratio.
Related in Design
contribute
IncludedLocal-only OSS contribution command center. Auto-refreshes the user's in-flight PR and issue state on invoke so conversations start with full context — no need to brief Claude on what's in flight. Helps the user find issues to contribute to on GitHub, builds per-repo dossiers of what each upstream expects (CLA, DCO, branch convention, AI policy, draft-first, review bots, issue templates), runs deterministic gates before any external action so AI-assisted contributions don't reach maintainers as slop. State is markdown-only: candidate files at ~/.contribute-system/candidates/, repo dossiers at ~/.contribute-system/research/, append-only event log at ~/.contribute-system/log.jsonl. No database, no cloud calls. Use when the user asks about their PRs / issues / contributions, wants to find new work to take on, claim an issue, build/refresh a repo's dossier, or draft a Design Issue or PR. Trigger with "/contribute", "what's my PR status", "find a contribution", "claim issue X", "draft a Design Issue for Y", "refresh dossier for Z".
architectural-analysis
IncludedUser-triggered deep architectural analysis of a codebase or scoped subtree across eight modes — information architecture, data flow, integration points, UI surfaces, interaction patterns, data model, control flow, and failure modes. This skill should be used when the user asks to "diagram this codebase," "map the architecture," "show the data flow," "give me an ERD," "trace control flow," "find the integration points," "verify the layout pattern," "audit the UX architecture," or any similar request whose primary deliverable is mermaid diagrams plus cited reports under docs/architecture/. Dispatches haiku/sonnet sub-agents in parallel for per-mode exploration, then verifies every citation mechanically before any node lands in a diagram. Not for one-off prose explanations of code (use code-explanation) or for high-level system design from scratch (use system-design).
mcp
IncludedModel Context Protocol (MCP) server development and tool management. Languages: Python, TypeScript. Capabilities: build MCP servers, integrate external APIs, discover/execute MCP tools, manage multi-server configs, design agent-centric tools. Actions: create, build, integrate, discover, execute, configure MCP servers/tools. Keywords: MCP, Model Context Protocol, MCP server, MCP tool, stdio transport, SSE transport, tool discovery, resource provider, prompt template, external API integration, Gemini CLI MCP, Claude MCP, agent tools, tool execution, server config. Use when: building MCP servers, integrating external APIs as MCP tools, discovering available MCP tools, executing MCP capabilities, configuring multi-server setups, designing tools for AI agents.
react-native-skia
IncludedDesign, build, debug, and optimise high-polish animated graphics in React Native or Expo using @shopify/react-native-skia, Reanimated, and Gesture Handler. Use when the user wants canvas-driven UI, shaders, paths, rich text, image filters, sprite fields, Skottie, video frames, snapshots, web CanvasKit setup, or performance tuning for custom motion-heavy elements such as loaders, hero art, cards, charts, progress indicators, particle systems, or gesture-driven surfaces. Also use when the user asks for fluid, glow, glass, blob, parallax, 60fps/120fps, or GPU-friendly animated effects in React Native, even if they do not explicitly say "Skia". Do not use for ordinary form/layout work with standard views.
plaid
IncludedProduct Led AI Development — guides founders from idea to launched product. Six capabilities: Idea (discover a product idea), Validate (pressure-test the idea against fatal flaws, problem reality, competition, and 2-week MVP feasibility), Plan (vision intake + document generation), Design (translate image references into a design.md spec), Launch (go-to-market strategy), and Build (roadmap execution). Use when someone says "PLAID", "plaid idea", "help me find an idea", "product idea", "idea from my business", "idea from my expertise", "plaid validate", "validate my idea", "pressure-test", "is this idea good", "find fatal flaws", "validate the problem", "plan a product", "define my vision", "generate a PRD", "product strategy", "plaid design", "design from image", "translate image to design", "create design.md", "extract design tokens", "plaid launch", "go-to-market", "launch plan", "GTM strategy", "launch playbook", "plaid build", "build the app", "start building", or "execute the roadmap".
nextjs-framer-motion-animations
IncludedAdds production-safe Motion for React or Framer Motion animations to Next.js apps, including reveal, hover and tap micro-interactions, whileInView, stagger, AnimatePresence, layout and layoutId transitions, reorder, scroll-linked UI, and lightweight route-content transitions. Use when the user asks to add, refactor, or debug Motion or Framer Motion in App Router or Pages Router codebases, especially around server/client boundaries, reduced motion, LazyMotion, bundle size, hydration, or route transitions. Avoid for GSAP-style timelines, WebGL or 3D scenes, heavy scroll storytelling, or CSS-only effects unless Motion is explicitly requested.