Vercel AI SDK

The Vercel AI SDK is an open-source TypeScript library for adding AI features to web apps. It gives one consistent interface for streaming text, calling tools, generating structured output and building chat interfaces across many model providers.

Switching between OpenAI, Anthropic, Google and others usually means changing a single line, which makes experiments cheap. React, Next.js, Vue and Svelte helpers handle the streaming UI details that are annoying to write yourself.

It is not a full agent platform, but recent versions include agent loops and tool calling. If your stack is JavaScript, it is probably the quickest way to ship a chat or generation feature.