What problem does it solve? UI features often ship after only being reviewed in code, so real users hit confusion, dead-ends, and wrong-target clicks in production and send the work back. This Skill makes the agent actually use the page in a browser before it is called done, catching friction before the user does. ## Core Features & Use Cases - Cold walkthrough of user goals: Lands on the page fresh, attempts each user goal, tries to break the flow, and tests at mobile width (~375px). - Heuristic evaluation: Scores the page against Nielsen's 10 heuristics, Fitts's Law target sizing, visual hierarchy, and goal completion with Pass / Issue / Critical ratings. - Severity-ranked report: Produces a markdown report grouping findings into Critical (block ship), Issues (fix before PR), and Polish (post-ship), with screenshots at key states. - Use Case: After implementing a new checkout flow, run this Skill against the local dev server before opening the PR to catch ambiguous labels, missing feedback, and broken mobile layouts. ## Quick Start Run a UX review of the new settings page at http://localhost:3000/settings, walking the goal of updating a notification preference, and report any critical issues before I open the PR.
