Evidence-based UI/UX review, implementation coordination, and post-build verification for existing screens, flows, components, screenshots, design artifacts, or live UI. Use when Codex needs to evaluate hierarchy, accessibility, responsiveness, usability, or design-system consistency from actual UI evidence, turn approved UI deltas into concrete page implementation via Gemini CLI, or validate completed UI work with `agent-browser` first, then Chrome DevTools or Playwright when deeper evidence or reproducible automation is needed. Do not use for first-pass PRD or UI-spec drafting from text-only briefs; use `gemini-cli` for planning documents first.
