Agent skill

23rd

by radiumcoders in radiumcoders/23rd.dev

Install, choose, and compose 23rd shadcn/ui registry components for React and Svelte 5.

No licenceAuto-check passedGame Development

Install 23rd

skills CLI

$ npx skills add radiumcoders/23rd.dev --skill 23rd -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install radiumcoders/23rd.dev 23rd --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/radiumcoders/23rd.dev.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/23rd .claude/skills/23rd && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "23rd" agent skill from https://github.com/radiumcoders/23rd.dev/tree/main/skills/23rd into .claude/skills/23rd/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "23rd", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/radiumcoders/23rd.dev/tree/main/skills/23rd

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add radiumcoders/23rd.dev --skill 23rd -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install radiumcoders/23rd.dev 23rd --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/radiumcoders/23rd.dev.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/23rd .agents/skills/23rd && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "23rd" agent skill from https://github.com/radiumcoders/23rd.dev/tree/main/skills/23rd into .agents/skills/23rd/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "23rd", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add radiumcoders/23rd.dev --skill 23rd -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install radiumcoders/23rd.dev 23rd --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/radiumcoders/23rd.dev.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/23rd .cursor/skills/23rd && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "23rd" agent skill from https://github.com/radiumcoders/23rd.dev/tree/main/skills/23rd into .cursor/skills/23rd/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "23rd", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/radiumcoders/23rd.dev.git --path skills/23rd

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add radiumcoders/23rd.dev --skill 23rd -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install radiumcoders/23rd.dev 23rd --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/radiumcoders/23rd.dev.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/23rd .gemini/skills/23rd && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "23rd" agent skill from https://github.com/radiumcoders/23rd.dev/tree/main/skills/23rd into .gemini/skills/23rd/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "23rd", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install radiumcoders/23rd.dev 23rd

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add radiumcoders/23rd.dev --skill 23rd -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/radiumcoders/23rd.dev.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/23rd .github/skills/23rd && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "23rd" agent skill from https://github.com/radiumcoders/23rd.dev/tree/main/skills/23rd into .github/skills/23rd/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "23rd", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add radiumcoders/23rd.dev --skill 23rd -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install radiumcoders/23rd.dev 23rd --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/radiumcoders/23rd.dev.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/23rd .opencode/skills/23rd && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "23rd" agent skill from https://github.com/radiumcoders/23rd.dev/tree/main/skills/23rd into .opencode/skills/23rd/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "23rd", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: 23rd
GitHub stars: 137
Token cost: ~2.8k tokens
SKILL.md length: 1,036 words
Files: 5
Skills in repo: 1
Repo updated: Oct 6, 2026
First seen: Oct 7, 2026
Licence: None found

At a glance

Install, choose, and compose 23rd shadcn/ui registry components for React and Svelte 5.

Works in 2 steps: theme="dark" or theme="light" forces it. → auto: html.dark → dark, html.light →…
The user wants a UI component
SKILL.md covers Install, Choose, Compose and Theme, plus 3 more sections
Calls pnpm, npx and yarn; reaches 23rd.dev

What it does

23rd is an agent skill from radiumcoders/23rd.dev. Install, choose, and compose 23rd shadcn/ui registry components for React and Svelte 5. Use when the user wants a UI component, background, shader, WebGL wash, hero atmosphere, footer, 404, color picker, typewriter text, ASCII effect, starfield, orb, or page-tilt from the 23rd registry (@23rd, 23rd.dev, radiumcoders/23rd.dev), or when adding a new component to this registry. Covers install commands, import paths, props, theming, and when not to use each item.

Its SKILL.md is about 2.8k tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files (for example `apis.md`, `components.md` and `conventions.md`).

It sits in Game Development, covering Theming and dark mode and 3D graphics and WebGL. It works with React, shadcn/ui, Svelte and Tailwind CSS. The repository describes itself as: Opinionated UI Components for shippers. An open source library of tasteful Web components. Framework agnostic. Copy, paste, ship.

When your agent uses it

The user wants a UI component
Hero atmosphere
Typewriter text
Page-tilt from the 23rd registry (@23rd

Example prompts

“/23rd”

Requirements

Node.js

Workflow steps

2 steps, taken from the first numbered list in SKILL.md.

theme="dark" or theme="light" forces it.
auto: html.dark → dark, html.light → light, then data-theme="dark"|"light", then prefers-color-scheme.

What it can do on your machine

Read from SKILL.md and the folder at commit 073610c. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
- pnpm
- npx
- yarn
- bunx
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
- 23rd.dev
Also links to:
- skills.sh
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

23rd loads about 2.8k tokens when it runs. Until then it costs about 117 tokens; SKILL.md has 1,036 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~117
When it runs · the whole SKILL.md, loaded when a task matches: ~2.8k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Without a licence we can't republish the file, so here is its outline and opening line. It has 1,036 words (~2,834 tokens).

“23rd is a shadcn registry of opinionated components. Install with the shadcn CLI, then own the source. Every published item has a React build and a Svelte 5 build. This skill is the playbook. Open the linked files before inventing…”

— opening of SKILL.md by radiumcoders

name: 23rd
metadata.author: 23rd
metadata.version: 1.0.0

Read the full SKILL.md on GitHub

Files

SKILL.md and 4 other files in skills/23rd of radiumcoders/23rd.dev.

SKILL.md
apis.md
components.md
conventions.md
recipes.md

Open the folder on GitHubat commit 073610c

Compare with similar skills

23rd next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

23rd compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
23rd this skillradiumcoders/23rd.dev	137	—	~2.8k	Automated safety check: Pass	None	yesterday
Tailwind To Stylexshadcn-labs/shadcn-cssinjs	122	—	~2.7k	Automated safety check: Pass	MIT	26 days ago
Tailwind CSS Patternsever-works/ever-works	158	3 repos	~1.6k	Automated safety check: Notes	AGPL-3.0	2 days ago
UI Design Systemtry-works/role-model	117	—	~5k	Automated safety check: Pass	MIT	today
UI UX Pro MaxOhh-889/skyroc	795	26 repos	~3.6k	Automated safety check: Notes	MIT	1 mo ago
Atlaspacifio/ui	154	—	~2.5k	Automated safety check: Pass	MIT	5 mo ago

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Works with

Questions about 23rd

What does 23rd do?

Install, choose, and compose 23rd shadcn/ui registry components for React and Svelte 5. dev. Install, choose, and compose 23rd shadcn/ui registry components for React and Svelte 5.

When should I use 23rd?

23rd fits situations like: the user wants a UI component; hero atmosphere; typewriter text; page-tilt from the 23rd registry (@23rd.

How do I install 23rd in Claude Code?

Run `npx skills add radiumcoders/23rd.dev --skill 23rd -a claude-code`. Or copy the skill folder (skills/23rd in radiumcoders/23rd.dev) into .claude/skills/23rd in your project. Claude Code loads it when a task matches its description.

How do I install 23rd in Codex?

Run `npx skills add radiumcoders/23rd.dev --skill 23rd -a codex`. Or copy the skill folder (skills/23rd in radiumcoders/23rd.dev) into .agents/skills/23rd in your project. Codex loads it when a task matches its description.

Can I use 23rd in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add radiumcoders/23rd.dev --skill 23rd -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/23rd, .gemini/skills/23rd, .github/skills/23rd and .opencode/skills/23rd in your project.

What does 23rd need to run?

Going by SKILL.md and its folder, 23rd needs the command-line tools its instructions call (pnpm, npx, yarn and bunx). Our summary lists: Node.js.

Does 23rd access the network?

SKILL.md names 2 domains. In commands or code: 23rd.dev; the agent is likely to contact it when it follows the instructions. As links in the text: skills.sh. This is read from the text; nothing was executed.

Is 23rd safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does 23rd use?

No licence was found for 23rd or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does 23rd use?

About 2.8k tokens (SKILL.md is roughly 11k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to 23rd?

Skills that share tags, products or a category with 23rd: Tailwind To Stylex (shadcn-labs/shadcn-cssinjs, 122 stars), Tailwind CSS Patterns (ever-works/ever-works, 158 stars), UI Design System (try-works/role-model, 117 stars) and UI UX Pro Max (Ohh-889/skyroc, 795 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains 23rd?

radiumcoders (a GitHub user) maintains it in radiumcoders/23rd.dev, which has 137 GitHub stars. The repository was last updated on October 6, 2026.

Source: radiumcoders/23rd.dev on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install 23rd

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

Tailwind To Stylex

Tailwind CSS Patterns

UI Design System

UI UX Pro Max

Atlas

Tailwind V4 Shadcn

Related

Questions about 23rd