Playground Builder creates self-contained single-file HTML playgrounds featuring interactive controls on one side, a live preview on the other, and a prompt output at the bottom with a copy button. It guides the agent to identify the playground type, load matching templates for tasks like design decisions, data exploration, or code review, and build a dark-themed responsive tool with sensible defaults and live updates. Reach for this skill when the user asks for an interactive playground, explorer, or visual tool for a complex topic.