UI/UX Excellence Prover MCP. Enforce 2026 UI standards: Motion, States, Accessibility.

Look, your AI client can spit out a bunch of code fast. But speed ain't quality. The interfaces it builds often fall way short of what senior designers use every day—they look cheap, they feel clunky, and they fail basic usability checks.

That’s where the validate_uiux_excellence tool comes in. It doesn't just glance at your design; it forces your AI client to run everything through six rigorous industry pillars. You get a critical review that goes way deeper than just making sure buttons work. It finds things like weird shadows, confusing depth, or motion that don’t mean anything.

Spatial Structure and Depth: This tool validates component placement by checking its semantic elevation level—you'll see it uses a system from 0 to 5 to communicate depth, not just throwing random box-shadow values on everything. It enforces principles like Liquid Glass materiality, making sure the layout communicates hierarchy through structure itself.

Motion Physics and Interaction: The tool checks your animations hard. It verifies that any motion uses proper spring physics models—specifically checking for stiffness and damping ratios at a consistent 60 frames per second (fps). If the animation doesn't serve a clear function, like guiding the user or confirming an action, it fails.

You won't get decorative wobble; you'll get purposeful movement.

Element States and Lifecycle: Every interactive component must pass through a full lifecycle test. This includes checking for eight mandatory states: idle, hover (when the mouse’s over it), active (when you press it down), focus (for keyboard navigation), disabled (if it can't be used yet), loading, success, and error. It won't let you launch anything without all those pieces.

Grid System and Spacing: The tool enforces structure across the whole layout. You’ll see it checks against a strict 8px modular grid system for alignment and consistently scales your typography. This means no arbitrary padding—everything has to fit the established rhythm, or it gets flagged.

Accessibility Compliance (WCAG AAA): It runs comprehensive tests against WCAG 2.2 AAA standards. These aren't just suggestions; they are hard requirements. The tool ensures proper aria roles for screen readers and implements keyboard focus traps so that when a user navigates with the Tab key, their focus never gets lost in the design.

This is non-negotiable.

Dark Pattern Auditing: Finally, it actively hunts down dark patterns—those sneaky tricks like infinite scroll mechanisms or fake urgency timers. It forces intentional friction and transparency into your UI, making sure the user experience isn't misleading or manipulative.

When you use this tool, you get a complete architectural review that ensures your output doesn't just function but looks like it belongs in a real product at the top tier of the industry. It handles everything from semantic depth levels and spring physics models to WCAG AAA compliance and eight-state microinteractions.