What problem does it solve? AI-generated interfaces frequently ship with accessibility defects: low-contrast text, removed focus outlines, mouse-only interactions, and missing loading or error states. This Skill gives coding agents concrete rules and a deterministic contrast checker so UI work meets WCAG AA instead of relying on guesswork. ## Core Features & Use Cases - Contrast Verification: Ships a Python script (contrast-check.py), the WCAG 2.x luminance formula, and a precomputed reference table to verify text and non-text color pairings against 4.5:1 and 3:1 thresholds, plus an MCP stdio server exposing the checker as a tool. - Keyboard and Focus Rules: Enforces reachable tab order, visible focus indicators, Escape-closable dialogs, and forbids outline: none without a replacement. - State and Mobile Checks: Requires perceivable empty, loading, and error states, 200% text zoom without clipping, and inputs that stay visible above the on-screen keyboard. - Use Case: While building a dashboard, an agent pairs #777777 text on a white background; running the checker reports 4.48:1, failing normal text, so the agent darkens the color before shipping. ## Quick Start Ask the agent to review your UI code with the antislop-human checklist and run the contrast checker on every text and background color pairing.
