Sandbox MCP Server

Software Development Kit for Vercel Sandbox

Local serverstdioPython

What is the Sandbox MCP server?

Sandbox MCP server exists for a simple reason — assistants are far more useful when they can act on Sandbox directly instead of describing what you should do. Software Development Kit for Vercel Sandbox.

What you get

Vercel Sandbox allows you to run arbitrary code in isolated, ephemeral Linux VMs. View the documentation here.

A sandbox is an isolated Linux system for your experimentation and use. Internally, it is a Firecracker MicroVM that is powered by [the same infrastructure][hive] that powers 2M+ builds a day at Vercel.

Configuration and credentials

You will need 4 environment variables: VERCEL_OIDC_TOKEN, VERCEL_TEAM_ID, VERCEL_PROJECT_ID, VERCEL_TOKEN. The server will not start without them, which is usually why the tools fail to appear on a first run. Keep credentials in your client's env block or a secrets manager rather than in a file you might commit.

Setting it up

skills on npm is all you need. Most clients run it directly, so configuration is a few lines and a restart.

Choosing this one

Plenty of cloud and infrastructure servers cover similar ground. The differences that matter in practice are scope of access and how much setup stands between you and a working tool call. It is maintained by GitHub Actions; worth a glance at recent repository activity before you build anything load-bearing on it.

We check each listing at SyncDev against the project's documentation before it goes live — if something here drifts out of date, it is a bug worth reporting.

Before you rely on it

  • It runs with your machine's permissions. That is convenient and also the reason to think about what you point it at before you approve a tool call.
  • Missing credentials fail quietly in some clients — if no tools show up, check the environment block first.
  • MCP clients confirm each tool call by default. Leave that on until you have watched what the sandbox mcp server does with a few real requests.

How to install the Sandbox MCP server

{
  "mcpServers": {
    "server-sandbox": {
      "command": "npx",
      "args": ["-y", "skills"],
      "env": {
        "VERCEL_OIDC_TOKEN": "your-value",
        "VERCEL_TEAM_ID": "your-value",
        "VERCEL_PROJECT_ID": "your-value",
        "VERCEL_TOKEN": "your-value"
      }
    }
  }
}

Add to claude_desktop_config.json, then restart Claude Desktop.

Configuration

VariableDescriptionRequired
VERCEL_OIDC_TOKENCredential the server authenticates with.Yes
VERCEL_TEAM_IDConfiguration value read at startup.Optional
VERCEL_PROJECT_IDConfiguration value read at startup.Optional
VERCEL_TOKENCredential the server authenticates with.Yes

Frequently asked questions

It connects Sandbox to MCP-compatible AI assistants such as Claude and Cursor. Instead of copying data back and forth by hand, the assistant works with Sandbox directly.