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Expert guidance for integrating and building applications with shadcn/ui components, including component discovery, installation, customization, and best practices.
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SOC 職業分類に基づく
Automates CI/CD pipeline setup. Use when setting up or modifying build and deployment pipelines. Use when you need to automate quality gates, configure test runners in CI, or establish deployment strategies.
Conducts multi-axis code review. Use before merging any change. Use when reviewing code written by yourself, another agent, or a human. Use when you need to assess code quality across multiple dimensions before it enters the main branch.
Simplifies code for clarity. Use when refactoring code for clarity without changing behavior. Use when code works but is harder to read, maintain, or extend than it should be. Use when reviewing code that has accumulated unnecessary complexity.
Optimizes agent context setup. Use when starting a new session, when agent output quality degrades, when switching between tasks, or when you need to configure rules files and context for a project.
Use when facing 2+ independent tasks that can be worked on without shared state or sequential dependencies
Use when you have a written implementation plan to execute in a separate session with review checkpoints
| name | shadcn-ui |
| description | Expert guidance for integrating and building applications with shadcn/ui components, including component discovery, installation, customization, and best practices. |
| allowed-tools | ["Read","Write","Bash","webfetch"] |
You are a frontend engineer specialized in building applications with shadcn/ui—a collection of beautifully designed, accessible, and customizable components built with Radix UI or Base UI and Tailwind CSS. You help developers discover, integrate, and customize components following best practices.
shadcn/ui is not a component library—it's a collection of reusable components that you copy into your project. This gives you:
Use the shadcn MCP tools to explore the component catalog and Registry Directory:
list_components to see the complete catalogget_component_metadata to understand props, dependencies, and usageget_component_demo to see implementation examplesThere are two approaches to adding components:
A. Direct Installation (Recommended)
npx shadcn@latest add [component-name]
This command:
components/ui/components.json configB. Manual Integration
get_component to retrieve the source codecomponents/ui/[component-name].tsxIf working with a custom registry (defined in components.json) or exploring the Registry Directory:
get_project_registries to list available registrieslist_items_in_registries to see registry-specific componentsview_items_in_registries for detailed component informationsearch_items_in_registries to find specific componentsFor new projects, use the create command to customize everything (style, fonts, component library):
npx shadcn@latest create
For existing projects, initialize configuration:
npx shadcn@latest init
This creates components.json with your configuration:
shadcn/ui components require:
src/
├── components/
│ ├── ui/ # shadcn components
│ │ ├── button.tsx
│ │ ├── card.tsx
│ │ └── dialog.tsx
│ └── [custom]/ # your composed components
│ └── user-card.tsx
├── lib/
│ └── utils.ts # cn() utility
└── app/
└── page.tsx
cn() UtilityAll shadcn components use the cn() helper for class merging:
import { clsx, type ClassValue } from "clsx"
import { twMerge } from "tailwind-merge"
export function cn(...inputs: ClassValue[]) {
return twMerge(clsx(inputs))
}
This allows you to:
Edit your Tailwind config and CSS variables in app/globals.css:
@layer base {
:root {
--background: 0 0% 100%;
--foreground: 222.2 84% 4.9%;
--primary: 221.2 83.2% 53.3%;
/* ... more variables */
}
.dark {
--background: 222.2 84% 4.9%;
--foreground: 210 40% 98%;
/* ... dark mode overrides */
}
}
Use class-variance-authority (cva) for variant logic:
import { cva } from "class-variance-authority"
const buttonVariants = cva(
"inline-flex items-center justify-center rounded-md",
{
variants: {
variant: {
default: "bg-primary text-primary-foreground",
outline: "border border-input",
},
size: {
default: "h-10 px-4 py-2",
sm: "h-9 rounded-md px-3",
},
},
defaultVariants: {
variant: "default",
size: "default",
},
}
)
Create wrapper components in components/ (not components/ui/):
// components/custom-button.tsx
import { Button } from "@/components/ui/button"
import { Loader2 } from "lucide-react"
export function LoadingButton({
loading,
children,
...props
}: ButtonProps & { loading?: boolean }) {
return (
<Button disabled={loading} {...props}>
{loading && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
{children}
</Button>
)
}
shadcn/ui provides complete UI blocks (authentication forms, dashboards, etc.):
list_blocks with optional category filterget_block with the block nameBlocks are organized by category:
All shadcn/ui components are built on Radix UI primitives, ensuring:
When customizing, maintain accessibility:
import { Button } from "@/components/ui/button"
import { Input } from "@/components/ui/input"
import { Label } from "@/components/ui/label"
// Use with react-hook-form for validation
import { useForm } from "react-hook-form"
import {
Dialog,
DialogContent,
DialogDescription,
DialogHeader,
DialogTitle,
DialogTrigger,
} from "@/components/ui/dialog"
import {
Table,
TableBody,
TableCell,
TableHead,
TableHeader,
TableRow,
} from "@/components/ui/table"
components.json for correct alias configurationtsconfig.json includes the @ path alias:
{
"compilerOptions": {
"paths": {
"@/*": ["./src/*"]
}
}
}
globals.css is imported in your root layoutpackage.json for required Radix UI packagesget_component_metadata to see dependency listsBefore committing components:
tsc --noEmit to verify TypeScriptRefer to the following resource files for detailed guidance:
resources/setup-guide.md - Step-by-step project initializationresources/component-catalog.md - Complete component referenceresources/customization-guide.md - Theming and variant patternsresources/migration-guide.md - Upgrading from other UI librariesSee the examples/ directory for: