A set of interface components for web applications, such as buttons, tabs, and cards, from the shadcn/ui collection. The components are copied into the project's source code.

It is for building user interfaces with the available components in the project's src/components/ui directory.

It gives developers a consistent starting point for common interface elements without designing each one from scratch.

shadcn — Cursor rule by squirrelogic

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add rules/squirrelogic/cursor-rules/shadcn

Clone the repo

git clone --depth 1 https://github.com/squirrelogic/cursor-rules

Per session 0 Nothing until a file matches its globs; then the whole rule loads.

When invoked 522 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5	$0.00000	$0.00522
Opus 5	$0.00000	$0.00261
Sonnet 5	$0.00000	$0.00104
Haiku 4.5	$0.00000	$0.00052

Measured 2d ago against content hash 46858492a360, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

shadcn scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

nextjs/shadcn.mdc · 100 lines

What it actually says

Shadcn UI Components

This project uses @shadcn/ui for UI components. These are beautifully designed, accessible components that you can copy and paste into your apps.

Finding and Using Components

Components are available in the src/components/ui directory, following the aliases configured in components.json

Using Components

Import components from the ui directory using the configured aliases:

import { Button } from "@/components/ui/button"
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs"
import { Card, CardContent, CardDescription, CardFooter, CardHeader, CardTitle } from "@/components/ui/card"

Example usage:

<Button variant="outline">Click me</Button>

<Card>
  <CardHeader>
    <CardTitle>Card Title</CardTitle>
    <CardDescription>Card Description</CardDescription>
  </CardHeader>
  <CardContent>
    <p>Card Content</p>
  </CardContent>
  <CardFooter>
    <p>Card Footer</p>
  </CardFooter>
</Card>

Installing Additional Components

Many more components are available but not currently installed. You can view the complete list at https://ui.shadcn.com/r

To install additional components, use the Shadcn CLI:

npx shadcn@latest add [component-name]

For example, to add the Accordion component:

npx shadcn@latest add accordion

Note: npx shadcn-ui@latest is deprecated, use npx shadcn@latest instead

Some commonly used components are

Accordion
Alert
AlertDialog
AspectRatio
Avatar
Calendar
Checkbox
Collapsible
Command
ContextMenu
DataTable
DatePicker
Dropdown Menu
Form
Hover Card
Menubar
Navigation Menu
Popover
Progress
Radio Group
ScrollArea
Select
Separator
Sheet
Skeleton
Slider
Switch
Table
Textarea
Toast
Toggle
Tooltip

Component Styling

This project uses the "new-york" style variant with the "neutral" base color and CSS variables for theming, as configured in components.json.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2d ago First seen · 100 lines · 522 tokens per session scan A 46858492a360

Subscribe to this mod's changes

shadcn is a cursor rule published in the GitHub repository squirrelogic/cursor-rules (20 stars, last pushed 1y ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 522 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Frontend

shadcn

Getting it into your agent

What it costs to keep this loaded

Grade A, and why

Nothing flagged

What it actually says

Shadcn UI Components

Finding and Using Components

Using Components

Installing Additional Components

Component Styling

What this file has done since we first saw it

Other cursor rules, from other repositories

angular-20

dev-standard

typescript

coolify-ai-docs

python_lib

specs