v0.2.1 / MIT

The UI design system for AI agents.
Copy, paste, ship.

225 open-source React components for building AI apps — chat, streaming, tool calls, citations, agents, and artifacts. Every component is also a machine-readable JSON descriptor: agents (Claude, Cursor, Cline, Continue) read the registry directly without scraping HTML.

pnpm dlx shadcn@latest add https://ui.vllnt.ai/r/button.json

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MIT
TypeScript
RSC compatible
Tailwind v4 ready

225

Components

Latest releases

Follow what changed across the component library, registry, and release pipeline.

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0.2.1What's new
v0.2.1
Public API: ProgressCard now re-exported from @vllnt/ui — it shipped in 0.2.0's tarball but was missing from the barrel, so import { ProgressCard } from "@vllnt/ui" resolved to undefined.
Read notes
0.2.0
v0.2.0
AI family — AIChatInput, AIMessageBubble, AISourceCitation, AIStreamingText, AIToolCallDisplay, ThinkingBlock, ModelSelector.
Read notes
0.1.11
v0.1.11 — Fix Publish Pipeline
Re-extract tarball path from pnpm pack output for publish step.
Read notes

Agent-first

Built so AI coding agents can use it directly.

Every component ships as a machine-readable JSON descriptor with name, version, stability, accessibility schema, usage examples, and prop definitions. Agents discover the registry through three surfaces.

/llms.txt

Concise index per the llmstxt.org spec - sections, links, descriptions.

Open

/llms-full.txt

Full registry context in one fetch - docs + per-component descriptors.

Open

/mcp

Streamable HTTP MCP server. Tools: search_components, get_component, list_categories.

Open