.NET MAUI — UI Best Practices Skill

Purpose

This skill defines the recommended UI/UX patterns, layout strategies, styling conventions, accessibility rules, and performance guidelines for .NET MAUI applications. It ensures that all generated UI code is consistent, maintainable, responsive, and aligned with modern cross-platform design expectations.

The goal is to help agents produce clean, scalable, and accessible XAML and C# UI code across Android, iOS, Windows, and MacCatalyst.

Core Principles

1. Simplicity first Use minimal layout nesting, clear structure, and predictable patterns.
2. Consistency Centralize styles, colors, and fonts in Resources/Styles.
3. Responsiveness Use adaptive layouts (OnIdiom, OnPlatform, Grid, FlexLayout) to support all devices.
4. Accessibility Provide semantic properties, proper contrast, and screen reader support.
5. Performance Prefer compiled bindings, lightweight controls, and efficient layout containers.

Categories of Rules

• Layout & Structure
• Styling & Theming
• Controls & Components
• Accessibility
• Performance

Each rule is stored in the rules/ directory and should be applied whenever generating UI code.

Agent Usage Guidelines

• When generating XAML, follow the layout and styling rules.
• When creating new pages, apply consistent structure:
  • Root layout should be Grid or VerticalStackLayout.
  • Avoid deeply nested layouts.
  • Use styles instead of inline properties.
• When generating controls, prefer reusable components in /Views/Controls.
• When asked to “make the UI responsive,” apply idiom/platform conditions.
• When asked to “improve performance,” apply rules from the performance category.

Out of Scope

• Business logic (covered in other skills)
• Authentication UI flows (covered in maui-authentication)
• Deployment or platform packaging