Vercel turns AI SDK into an agent runtime

Vercel rebuilt AI SDK 7 into an agent runtime at Vercel Ship 2026, per the event's recap. AI SDK pulls 16 million weekly downloads, so the change reaches most JavaScript teams that already use it for model calls.

The new version adds multi-turn reasoning and tool calling. Agents built on it can work across files and sandboxes, all behind one provider-agnostic interface, per the recap.

Vercel paired the runtime with two new pieces. Eve lets developers define agent instructions and skills in natural language instead of code. Vercel Sandbox restricts what an agent can access or export while it runs.

Developers don't have to bet on a new framework here. The upgrade lands inside projects that already run the old version.

I'd bet AI SDK becomes the default agent interface for JS teams within a year. Not because it's the most capable option. Switching costs less than picking something new. Watch whether Eve's natural-language skill definitions hold up once agents juggle more than a couple of tools. That's usually where abstractions crack first. The recap doesn't say how Sandbox handles cost or latency at scale. That gap will matter once teams run agents in production instead of demos.