Agent skill

Web Artifacts Builder

by nexu-io in nexu-io/open-design

Build complex claude.ai HTML artifacts with React and Tailwind.

Apache-2.0Auto-check passedFrontend & Design

Install Web Artifacts Builder

skills CLI
$ npx skills add nexu-io/open-design --skill web-artifacts-builder -a claude-code

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

GitHub CLI
$ gh skill install nexu-io/open-design web-artifacts-builder --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/nexu-io/open-design.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/web-artifacts-builder .claude/skills/web-artifacts-builder && 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/

Facts

Skill name
web-artifacts-builder
GitHub stars
100k
Token cost
~337 tokens
SKILL.md length
96 words
Files
1
Skills in repo
245
Repo updated
First seen
Licence
Apache-2.0

At a glance

Build complex claude.ai HTML artifacts with React and Tailwind.

  • Tasks that involve HTML artifacts
  • SKILL.md covers What it does, Source and How to use
  • Reaches github.com
  • Tasks that involve CSS and styling

What it does

Web Artifacts Builder is an agent skill from nexu-io/open-design. Build complex claude.ai HTML artifacts with React and Tailwind. Anthropic's reference workflow for shipping rich, embeddable artifacts.

Its SKILL.md is about 340 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Frontend & Design, covering HTML artifacts and CSS and styling. It works with React and Tailwind CSS. The repository describes itself as: 🎨 Best DeepSeek Harness Design Plugin. The open-source Claude Design alternative. 🖥️ Local-first desktop app. 🖼️ Your coding agent becomes the design engine: prototypes… The licence is Apache-2.0.

When your agent uses it

  • Tasks that involve HTML artifacts
  • Tasks that involve CSS and styling

Example prompts

  • “/web-artifacts-builder”

What it can do on your machine

Read from SKILL.md and the folder at commit 3449fa6. 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

    No scripts in the folder and no shell commands in SKILL.md (its code samples are bash).

    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:

    • github.com

    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

Web Artifacts Builder loads about 337 tokens when it runs. Until then it costs about 39 tokens; SKILL.md has 96 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~39
When it runs · the whole SKILL.md, loaded when a task matches
~337

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

The full file from nexu-io/open-design at commit 3449fa6, republished under its Apache-2.0 licence (© nexu-io). 96 words, ~337 tokens.

Download SKILL.mdSave it as .claude/skills/web-artifacts-builder/SKILL.md (or your agent's skills folder).
name
web-artifacts-builder
description
Build complex claude.ai HTML artifacts with React and Tailwind. Anthropic's reference workflow for shipping rich, embeddable artifacts.
triggers
web artifacts, tailwind artifact, react artifact, anthropic artifact
od.mode
prototype
od.category
web-artifacts
od.upstream
https://github.com/anthropics/skills/tree/main/skills/web-artifacts-builder

web-artifacts-builder

Curated from Anthropic's official skills repository.

What it does

Build complex claude.ai HTML artifacts with React and Tailwind. Anthropic's reference workflow for shipping rich, embeddable artifacts.

Source

How to use

This catalogue entry advertises the skill in OpenDesign so the agent discovers it during planning. To run the full upstream workflow with its original assets, scripts, and references, install the upstream bundle into your active agent's skills directory:

bash
# Inspect the upstream README for exact paths
open https://github.com/anthropics/skills/tree/main/skills/web-artifacts-builder

Then ask the agent to invoke this skill by name (web-artifacts-builder) or with one of the trigger phrases listed in this skill's frontmatter.

© nexu-io, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/web-artifacts-builder of nexu-io/open-design.

Open the folder on GitHubat commit 3449fa6

Compare with similar skills

Web Artifacts Builder 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.

Web Artifacts Builder compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Web Artifacts Builder this skillnexu-io/open-design100k—~337Automated safety check: PassApache-2.0
Kill AI Slopyetone/kill-ai-slop1.3k—~1.4kAutomated safety check: PassApache-2.0
Cosscrafter-station/petdex4.2k—~1.4kAutomated safety check: PassMIT
Design StyleCastor6/tactus3761 repos~2.1kAutomated safety check: PassApache-2.0
Opensource UIbidyut10/opensourceui717—~1.1kAutomated safety check: PassMIT
Extract DesignManavarya09/design-extract4.2k—~786Automated safety check: NotesMIT

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Questions about Web Artifacts Builder

What does Web Artifacts Builder do?

Build complex claude.ai HTML artifacts with React and Tailwind. Web Artifacts Builder is an agent skill from nexu-io/open-design.ai HTML artifacts with React and Tailwind.

When should I use Web Artifacts Builder?

Web Artifacts Builder fits situations like: tasks that involve HTML artifacts; tasks that involve CSS and styling.

How do I install Web Artifacts Builder in Claude Code?

Run `npx skills add nexu-io/open-design --skill web-artifacts-builder -a claude-code`. Or copy the skill folder (skills/web-artifacts-builder in nexu-io/open-design) into .claude/skills/web-artifacts-builder in your project. Claude Code loads it when a task matches its description.

How do I install Web Artifacts Builder in Codex?

Run `npx skills add nexu-io/open-design --skill web-artifacts-builder -a codex`. Or copy the skill folder (skills/web-artifacts-builder in nexu-io/open-design) into .agents/skills/web-artifacts-builder in your project. Codex loads it when a task matches its description.

Can I use Web Artifacts Builder 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 nexu-io/open-design --skill web-artifacts-builder -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/web-artifacts-builder, .gemini/skills/web-artifacts-builder, .github/skills/web-artifacts-builder and .opencode/skills/web-artifacts-builder in your project.

What does Web Artifacts Builder need to run?

SKILL.md names no scripts, command-line tools or credentials: Web Artifacts Builder is instructions for the agent only.

Does Web Artifacts Builder access the network?

SKILL.md names 1 domain. In commands or code: github.com; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.

Is Web Artifacts Builder 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 Web Artifacts Builder use?

Web Artifacts Builder is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Web Artifacts Builder use?

About 337 tokens (SKILL.md is roughly 1.3k 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 Web Artifacts Builder?

Skills that share tags, products or a category with Web Artifacts Builder: Kill AI Slop (yetone/kill-ai-slop, 1.3k stars), Coss (crafter-station/petdex, 4.2k stars), Design Style (Castor6/tactus, 376 stars) and Opensource UI (bidyut10/opensourceui, 717 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Web Artifacts Builder?

nexu-io (a GitHub organization) maintains it in nexu-io/open-design, which has 99,905 GitHub stars. The repository holds 245 skills in this directory. The repository was last updated on October 8, 2026.

Source: nexu-io/open-design on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.