Vercel Sandbox is a secure cloud resource powered by Fluid compute . It is designed to run untrusted code, such as code generated by AI agents, in isolated and ephemeral environments.

Sandbox is a standalone SDK that can be executed from any environment, including non-Vercel platforms. Sandbox workloads run in ephemeral, isolated microVMs via the new Sandbox SDK , supporting execution times up to 45 minutes.

import { Sandbox } from "@vercel/sandbox" ;

import { generateText } from 'ai' ;

const result = await generateText ( {

model : "anthropic/claude-4-sonnet-20250514" ,

prompt : ` Write a Node.js script that prints a Haiku poem to stdout. ` ,

system : `

You are a developer that responds with the content of a single Node.js script.

You must include only the code without any markdown, nothing else.

Just include Javascript code and no characters before or after the code.

` ,

} ) ;

const sandbox = await Sandbox . create ( ) ;

await sandbox . writeFiles ( [

{ path : "script.js" , stream : Buffer .…