How to Limit Cursor to One UI Library

1# .cursorrules (add to existing file)
2
3## UI Library: Material UI (MUI) v5
4- ONLY use @mui/material components for all UI elements
5- Import pattern: import { Button, TextField } from '@mui/material'
6- Icons: import from '@mui/icons-material'
7- Styling: use sx prop for component-level styles, useTheme() for theme values
8- NEVER use: Tailwind classes, Chakra UI, Ant Design, raw HTML for UI elements
9- NEVER use: styled-components, emotion css prop (use sx prop instead)
10- FORBIDDEN imports: '@chakra-ui/*', 'antd', '@headlessui/*'
11- For layouts: use MUI Grid2, Stack, Box — not CSS Grid or Flexbox directly
12- Theme customization: src/theme.ts — always reference existing theme tokens

1// Prompt to type in Cursor Composer (Cmd+I):
2// @src/theme.ts @src/components/shared/AppButton.tsx
3// Generate a new UserProfileCard component using MUI.
4// Requirements:
5// - Use the theme colors and spacing from theme.ts
6// - Follow the same component structure as AppButton.tsx
7// - Use Card, CardContent, Avatar, Typography from @mui/material
8// - Include loading skeleton state
9// - Use sx prop for all styling, reference theme tokens

1---
2description: UI component library enforcement
3globs: "src/components/**, src/pages/**, **/*.tsx"
4alwaysApply: false
5---
6
7- All UI elements MUST use @mui/material components
8- Import components: import { Component } from '@mui/material'
9- Import icons: import { IconName } from '@mui/icons-material'
10- Use sx prop for styling, never className with CSS
11- Reference @src/theme.ts for theme tokens
12- Follow existing component patterns in src/components/shared/
13- FORBIDDEN: Tailwind classes, inline CSS objects, CSS modules
14- Use MUI responsive breakpoints: sx={{ p: { xs: 1, md: 2 } }}

1// In Cursor Settings → Features → Docs:
2// Add: https://mui.com/material-ui/api/
3// Label: MUI Component API
4//
5// Then use in prompts:
6// @Docs MUI Component API
7// Generate a DataGrid component that displays orders
8// with sorting, filtering, and pagination.