A Prompt Tuning Console for LLM Apps
Playground is a faithful recreation of the classic AI completion console: a prompt Textarea on the left, a settings rail on the right, and a toolbar with preset management on top. It is a block for anyone shipping an LLM product who needs a serious-looking surface for experimenting with prompts and generation parameters.
Typical homes for it are internal AI tooling, developer portals for model APIs, and admin areas of chatbot products. If your interface leans conversational instead, the AI chat blocks are the neighboring option; this block is aimed at parameter-heavy single-turn work.
Sliders, Hover Cards, and Model Pickers
Temperature, maximum length, and top P each get a dedicated selector component pairing a Slider with a live value readout, wrapped in a HoverCard that explains what the parameter does after a short open delay.
The model selector is a Popover housing a Command palette grouped by model family, with a side panel that previews the highlighted model's description and strengths. A useMutationObserver hook tracks which item the keyboard is peeking at, a detail worth stealing for any searchable picker.
Complete, Insert, and Edit Modes
A Tabs component switches the working area between three modes drawn from real completion APIs: complete for open-ended prompts, insert for filling a gap between a prefix and suffix, and edit for rewriting text under instructions. Each TabsContent swaps the textarea arrangement while the settings rail stays constant.
The toolbar adds preset workflows: a combobox for loading saved presets, a save Dialog, a share Popover that offers a copyable link, a code viewer Drawer showing the API call for current settings, and a destructive delete flow inside a DropdownMenu with an AlertDialog confirmation.
Recoloring the Console With Theme Tokens
The whole console inherits Shadcn UI's CSS variable system, so it flips between dark and light automatically under next-themes. Labels use standard foreground tokens, hover cards and popovers sit on bg-popover, and the mode icons are pure currentColor SVGs that tint themselves.
Customization is a Tailwind exercise: tighten the settings rail width in the grid template, restyle the sliders by adjusting the primary token, or hide modes your API does not support by removing a TabsTrigger. No component internals need forking.
Copy It Free or Pull It With the CLI
Being a free block, the playground exposes every source file (nine components plus the models and presets data) directly in the code tab with copy buttons, no login involved. The top of the page also supplies the shadcn CLI one-liner in npm, pnpm, yarn, and bun forms if you would rather have the registry wire the files in.
The console also ships beyond React: there is a Vuejs rendition built with shadcn-vue and a Svelte rendition built with shadcn-svelte, keeping the sliders, hover cards, and command palette behavior consistent across all three, and the whole playgrounds category follows that pattern.