This file is byte-identical to the first copy the registry indexed, one of 3 indexed copies. Same content hash, so the same checks give both the same grade.
playground from anthropics/claude-plugins-official is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
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.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# 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
1. **Identify the playground type** from the user's request
2. **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)
…
The line at the top of this page pins the label git:20260129.4e459fb, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
GET https://markdownregistry.com/api/v1/artifacts/art_e3qy3x4azsi2zrzp
GET https://markdownregistry.com/api/v1/resolve?ref=anthropics/claude-plugins-official/playground
GET https://markdownregistry.com/api/v1/blob/521a3d62211e5f47b65ed17b660e001b15cf8d88d058cbf31bc00e889bcb63cc
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
anthropics/claude-plugins-official · external_plugins/discord/skills/access/SKILL.md · Manage Discord channel access — approve pairings, edit allowlists, set DM/group policy. Use when the user asks to pair…
anthropics/claude-plugins-official · external_plugins/discord/skills/configure/SKILL.md · Set up the Discord channel — save the bot token and review access policy. Use when the user pastes a Discord bot token…
anthropics/claude-plugins-official · external_plugins/imessage/skills/access/SKILL.md · Manage iMessage channel access — approve pairings, edit allowlists, set DM/group policy. Use when the user asks to…
anthropics/claude-plugins-official · external_plugins/imessage/skills/configure/SKILL.md · Check iMessage channel setup and review access policy. Use when the user asks to configure iMessage, asks "how do I set…
anthropics/claude-plugins-official · external_plugins/telegram/skills/access/SKILL.md · Manage Telegram channel access — approve pairings, edit allowlists, set DM/group policy. Use when the user asks to…
anthropics/claude-plugins-official · external_plugins/telegram/skills/configure/SKILL.md · Set up the Telegram channel — save the bot token and review access policy. Use when the user pastes a Telegram bot…
anthropics/claude-plugins-official · plugins/claude-code-setup/skills/claude-automation-recommender/SKILL.md · Analyze a codebase and recommend Claude Code automations (hooks, subagents, skills, plugins, MCP servers). Use when…
anthropics/claude-plugins-official · plugins/claude-md-management/skills/claude-md-improver/SKILL.md · Audit and improve CLAUDE.md files in repositories. Use when user asks to check, audit, update, improve, or fix…
anthropics/claude-plugins-official · plugins/claude-security/skills/claude-security/SKILL.md · Claude Security: scan the codebase (the whole repository or a scoped part of it), scan changes (this branch's or a pull…
anthropics/claude-plugins-official · plugins/cwc-makers/skills/cardputer-buddy/SKILL.md · Iterate on the Cardputer-Adv MicroPython app bundle (Claude Buddy, Snake, Hello) after the device is already…
anthropics/claude-plugins-official · plugins/example-plugin/skills/example-command/SKILL.md · An example user-invoked skill that demonstrates frontmatter options and the skills/<name>/SKILL.md layout
sandbaseai/sandbase-skills · marketing/playground/SKILL.md · Create, implement, or review playground work with format, accessibility, performance, and visual-verification controls…
