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 . from ( result .…