Vercel Releases UI SDK: 50+ UI Behaviors for AI Coding Agents

Vercel Labs has released UI SDK, an open-source beta headless library of 50+ interface behaviors that coding agents assemble into accessible components for React, Vue, Svelte, Solid and Web Components. It ships as 6 npm packages at 0.1.0-beta.1 under Apache-2.0, with a createAgent() bridge letting agents snapshot UI state and act on it; Vercel's self-reported benchmark on one task showed 69% fewer tool calls, 61% faster time and 56% lower cost versus browser tools.