xsai

Why we included this project

If you've reached for the Vercel AI SDK and wished it shipped with less baggage, xsAI is worth a look. It's a TypeScript library that talks to any OpenAI-compatible endpoint, whether that's OpenAI itself, Ollama, or a local gateway, through a focused set of utilities for generating text, streaming responses, and structured output. The project keeps its footprint small by building directly on the Fetch API, staying ESM-only, and avoiding dependencies unless they're strictly required, which makes it a practical choice for edge functions and browser bundles. Tool calling is supported out of the box, so you can wire up agents that invoke functions without pulling in a heavier framework. Teams that want a portable foundation for OpenAI-compatible apps rather than a full application framework will find the trade-offs clearly documented.