How to run Claude Code on Vercel Sandbox

Vercel has recently launched sandbox feature where we can safely run untrusted or user/AI-generated code our app with complete isolation

Getting Started

You need to make sure you’ve installed and set up the vercel CLI on your machine if not.

1. Install Vercel CLI Setup

   npm i -g vercel
   vercel login
   

2. Link your project to your local repo You’ll need to have a project to use AI sandbox even locally (since the code runs on their server)

   vercel link
   

3. Pull the latest environment variables

   vercel env pull
   

   This will pull VERCEL_OIDC_TOKEN which is needed for Vercel sandbox.

4. Set up ANTHROPIC_API_KEY
   Add your Anthropic API key to your environment variables.
   You can add it to your .env.local file:

   ANTHROPIC_API_KEY=your-key-here
   

Snippet

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

const apiKey = process.env.ANTHROPIC_API_KEY;

async function main() {
  if (!apiKey) {
    throw new Error('ANTHROPIC_API_KEY is not set');
  }

  const sandbox = await Sandbox.create({
    resources: { vcpus: 4 },
    timeout: 300,
    runtime: 'node22',
  });

  await sandbox.runCommand({
    cmd: 'npm',
    args: ['install', '-g', '@anthropic-ai/claude-code'],
    stderr: process.stderr,
    stdout: process.stdout,
  });

  await sandbox.runCommand({
    cmd: 'claude',
    args: ['-p', 'hello'],
    stderr: process.stderr,
    stdout: process.stdout,
    env: {
      ANTHROPIC_API_KEY: apiKey,
    },
  });
}

await main();

Running the Code

node --env-file .env.local ./index.js

Credits

Based on https://x.com/RhysSullivan/status/1956826761951666387

Happy running code!