playground

Q: How do I install playground?

Run npx skills add https://github.com/anthropics/claude-plugins-official --skill playground in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/playground/ (personal) or .claude/skills/playground/ (project).

by anthropics OfficialFrontend & Design

Creates interactive HTML playgrounds — self-contained single-file explorers that let users configure something visually through controls, see a live preview, and copy out a prompt. Use when the user asks to make a playground, explorer, or interactive tool for a topic.

Installs: 8.1K
Last 24h: +50
Trending rank: #3342
Security: Pass

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/anthropics/claude-plugins-official --skill playground

01
Install
Run the command in your project. The CLI asks which agents to install for.
02
Describe the task
Ask your agent for something this skill covers. It loads playground automatically when relevant.
03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.

Security audits

Independent scans of the skill's instructions and bundled files.

Gen Agent Trust Hub PassSAFE ·The playground skill enables the creation of interactive HTML tools. It includes security considerations such as indirect prompt injection and command execution, which are integral to its functionality. The skill also employs positive security practices by avoiding external dependencies.

Socket PassNo alerts

Snyk PassLOW ·Risk: LOW · No issues

Runlayer PassNONE ·7 files scanned · No issues

ZeroLeaks PassNONE ·Score: 93/100 · 2 sections analyzed

SKILL.md

The instructions your agent reads when the skill is triggered.

Playground Builder

A playground is a self-contained HTML file with interactive controls on one side, a live preview on the other, and a prompt output at the bottom with a copy button. The user adjusts controls, explores visually, then copies the generated prompt back into Claude.

When to use this skill

When the user asks for an interactive playground, explorer, or visual tool for a topic — especially when the input space is large, visual, or structural and hard to express as plain text.

How to use this skill

Identify the playground type from the user's request
Load the matching template from templates/:
- templates/design-playground.md — Visual design decisions (components, layouts, spacing, color, typography)
- templates/data-explorer.md — Data and query building (SQL, APIs, pipelines, regex)
- templates/concept-map.md — Learning and exploration (concept maps, knowledge gaps, scope mapping)
- templates/document-critique.md — Document review (suggestions with approve/reject/comment workflow)
- templates/diff-review.md — Code review (git diffs, commits, PRs with line-by-line commenting)
- templates/code-map.md — Codebase architecture (component relationships, data flow, layer diagrams)
Follow the template to build the playground. If the topic doesn't fit any template cleanly, use the one closest and adapt.
Open in browser. After writing the HTML file, run open <filename>.html to launch it in the user's default browser.

Core requirements (every playground)

Single HTML file. Inline all CSS and JS. No external dependencies.
Live preview. Updates instantly on every control change. No "Apply" button.
Prompt output. Natural language, not a value dump. Only mentions non-default choices. Includes enough context to act on without seeing the playground. Updates live.
Copy button. Clipboard copy with brief "Copied!" feedback.
Sensible defaults + presets. Looks good on first load. Include 3-5 named presets that snap all controls to a cohesive combination.
Dark theme. System font for UI, monospace for code/values. Minimal chrome.

State management pattern

Keep a single state object. Every control writes to it, every render reads from it.

const state = { /* all configurable values */ };

function updateAll() {
  renderPreview(); // update the visual
  updatePrompt();  // rebuild the prompt text
}
// Every control calls updateAll() on change

Prompt output pattern

function updatePrompt() {
  const parts = [];

  // Only mention non-default values
  if (state.borderRadius !== DEFAULTS.borderRadius) {
    parts.push(`border-radius of ${state.borderRadius}px`);
  }

  // Use qualitative language alongside numbers
  if (state.shadowBlur > 16) parts.push('a pronounced shadow');
  else if (state.shadowBlur > 0) parts.push('a subtle shadow');

  prompt.textContent = `Update the card to use ${parts.join(', ')}.`;
}

Common mistakes to avoid

Prompt output is just a value dump → write it as a natural instruction
Too many controls at once → group by concern, hide advanced in a collapsible section
Preview doesn't update instantly → every control change must trigger immediate re-render
No defaults or presets → starts empty or broken on load
External dependencies → if CDN is down, playground is dead
Prompt lacks context → include enough that it's actionable without the playground

FAQ

What does the playground skill do?

How do I install playground?

Run npx skills add https://github.com/anthropics/claude-plugins-official --skill playground in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/playground/ (personal) or .claude/skills/playground/ (project).

Which AI agents can use playground?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is playground safe to install?

Security partners have reviewed it: Gen Agent Trust Hub passed; Socket passed; Snyk passed; Runlayer passed; ZeroLeaks passed. As with any skill, read the SKILL.md and bundled scripts before installing.

Who maintains playground?

It is published by anthropics in anthropics/claude-plugins-official, and it is an official skill from the maker of the technology it covers. It has 8,071 recorded installs.