What problem does it solve? Manually auditing UI code for design system compliance is slow and inconsistent, and teams often miss accessibility, typography, and performance issues before shipping. ## Core Features & Use Cases - Guideline-Based Code Review: Checks UI files against the pinned Vercel Web Interface Guidelines covering accessibility, focus states, forms, animation, typography, images, performance, navigation, dark mode, i18n, and hydration safety. - Reproducible Pinned Snapshot: Uses a vendored copy of the guidelines in references/guidelines.md as the default source, with an optional fetch of the live upstream version to detect rule changes. - Terse Actionable Output: Reports findings grouped by file in a VS Code-clickable file:line format, flagging anti-patterns like transition: all, missing aria-labels, and images without dimensions. - Use Case: Before merging a pull request, run the review on changed React components to catch missing focus-visible styles, unlabeled icon buttons, and hardcoded date formats. ## Quick Start Ask the assistant to review your UI files against the Vercel Web Interface Guidelines, for example: review src/components/Button.tsx for design guideline compliance.