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act-sdk-js: Skill for Claude Code

.agents/skills/shadcn/SKILL.md

shadcn is a skill for Claude Code, Codex from act-sdk/act-sdk-js. It costs 90 tokens per session (3,970 once invoked), scanned A, a copy of shadcn, MIT.

A toolset for adding and working with shadcn/ui components, which are reusable interface building blocks provided as source code in a project. It also supports searching, styling, composing, and debugging those components.

In plain words
What is it for?
Managing shadcn/ui projects, adding components, checking registries and documentation, composing screens, and fixing component or styling problems.
Why use it?
It helps developers reuse existing building blocks and keep interface patterns consistent instead of recreating common controls.

Skill for Claude CodeCodex

Written for Claude Code and Codex: user-invocable in frontmatter, but also agents/openai.yaml present. Also seen: installed under .agents/ (shared by several agents).

This is act-sdk/act-sdk-js's own configuration. It tells Claude Code and Codex how to work on act-sdk-js itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything act-sdk-js configures →

not rated 3repo 4mo ago A scan 90 tokens copy · 89% MIT
View source ↗ act-sdk/act-sdk-js act-sdk.dev
Reuse

Borrowing it

Nothing to install: this file belongs to act-sdk/act-sdk-js. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/act-sdk/act-sdk-js/main/.agents/skills/shadcn/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/act-sdk/act-sdk-js

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for shadcn

README.md
[![agentmods](https://agentmods.dev/badge/skills/act-sdk/act-sdk-js/shadcn/github.svg)](https://agentmods.dev/skills/act-sdk/act-sdk-js/shadcn)
Your own site
<a href="https://agentmods.dev/skills/act-sdk/act-sdk-js/shadcn"><img src="https://agentmods.dev/badge/skills/act-sdk/act-sdk-js/shadcn/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for shadcn

Your own site · 80×15
<a href="https://agentmods.dev/skills/act-sdk/act-sdk-js/shadcn"><img src="https://agentmods.dev/badge/skills/act-sdk/act-sdk-js/shadcn.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 90 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,970 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 89% copy Near-identical to another mod 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00090 $0.03970
Opus 5.5 $0.00036 $0.01588
Sonnet 5.5 $0.00018 $0.00794
Haiku 4.5 $0.00009 $0.00397

Measured 1mo ago against content hash cefd8f067461, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 1mo 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.

Origin

This is a copy

89% identical to shadcn — 78 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.agents/skills/shadcn/SKILL.md · 241 lines

How it starts

The opening of the file, as written. The whole thing — 241 lines — stays where its author put it; the contents beside it link to each section on GitHub.

shadcn/ui

A framework for building ui, components and design systems. Components are added as source code to the user's project via the CLI.

IMPORTANT: Run all CLI commands using the project's package runner: npx shadcn@latest, pnpm dlx shadcn@latest, or bunx --bun shadcn@latest — based on the project's packageManager. Examples below use npx shadcn@latest but substitute the correct runner for the project.

Current Project Context

!`npx shadcn@latest info --json 2>/dev/null || echo '{"error": "No shadcn project found. Run shadcn init first."}'`

The JSON above contains the project config and installed components. Use npx shadcn@latest docs <component> to get documentation and example URLs for any component.

Principles

  1. Use existing components first. Use npx shadcn@latest search to check registries before writing custom UI. Check community registries too.
  2. Compose, don't reinvent. Settings page = Tabs + Card + form controls. Dashboard = Sidebar + Card + Chart + Table.
  3. Use built-in variants before custom styles. variant="outline", size="sm", etc.
  4. Use semantic colors. bg-primary, text-muted-foreground — never raw values like bg-blue-500.

Critical Rules

These rules are always enforced. Each links to a file with Incorrect/Correct code pairs.

Styling & Tailwind → styling.md

  • className for layout, not styling. Never override component colors or typography.
  • No space-x-* or space-y-*. Use flex with gap-*. For vertical stacks, flex flex-col gap-*.
  • Use size-* when width and height are equal. size-10 not w-10 h-10.
  • Use truncate shorthand. Not overflow-hidden text-ellipsis whitespace-nowrap.
  • No manual dark: color overrides. Use semantic tokens (bg-background, text-muted-foreground).
  • Use cn() for conditional classes. Don't write manual template literal ternaries.
  • No manual z-index on overlay components. Dialog, Sheet, Popover, etc. handle their own stacking.

Read the full file on GitHub · 241 lines

Files

What ships with it

12 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

  1. 1mo ago First seen · 241 lines · 90 tokens per session scan A cefd8f067461

Subscribe to this mod's changes

shadcn is a skill published in the GitHub repository act-sdk/act-sdk-js (3 stars, last pushed 4mo ago), licensed MIT. It adds 90 tokens to every session and 3,970 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 89% identical to shadcn, differing in 78 lines, and is treated as a copy.

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