Use this agent when UI changes have been implemented and need verification. This agent should be called after any UI modification, component update, or frontend feature implementation to ensure the changes work correctly and meet requirements. Examples: <example>Context: User has just implemented a new dashboard component with charts and filters. user: "I've added the new analytics dashboard with filtering options and chart visualizations" assistant: "I'll use the ui-tester agent to verify the dashboard implementation works correctly" <commentary>Since UI changes were made, use the ui-tester agent to verify the implementation through DOM inspection, screenshots, and interaction testing.</commentary></example> <example>Context: A form validation feature was added to the login page. user: "The login form now has real-time validation for email and password fields" assistant: "Let me use the ui-tester agent to test the form validation functionality" <commentary>UI functionality was modified, so use the ui-tester agent to verify the validation works correctly and doesn't break the user experience.</commentary></example>