> ## Documentation Index
> Fetch the complete documentation index at: https://developer.box.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Vercel Sandbox

> Use Box Mount to give an agent running in a Vercel Sandbox governed access to a Box folder.

[Vercel Sandbox](https://vercel.com/docs/sandbox) gives you an on-demand Linux microVM with its own filesystem, network, and process space. Box Mount runs inside that sandbox and maps a Box folder to a standard POSIX path, so your agent works with ordinary file operations while Box remains the system of record.

## Before you begin

On the Box side, you need:

* Access to the Box Mount developer preview, including the Box Mount binary. To request access, complete the [Box Mount developer preview form](https://bit.ly/box-mount-preview).
* A Box app configured for OAuth 2.0 or JWT, with its credentials saved as a `box-config.json` file. See [Configure credentials](https://developer.box.com/guides/box-mount#configure-credentials).
* The ID of the Box folder you want to mount. This is the number at the end of the folder URL on Box.

## Demo video

This demo mounts a Box folder in a Vercel Sandbox, runs an agent that answers a security questionnaire from approved policy documents, and syncs the finished workbook and review list back to Box.

[Build a Governed AI Agent with Vercel Sandbox + Box Mount](https://www.youtube.com/embed/oMHo2jMFoGc)

## Set up Box Mount in Vercel Sandbox

Follow [Box Mount](https://vercel.com/docs/sandbox/ecosystem/box-mount) in the Vercel documentation. It covers installing Box Mount in a sandbox, running the sync and the agent as separate users, mounting the folder, and unmounting before the sandbox stops.

The separate-users setup follows the Box recommendation in [Secure your credentials](https://developer.box.com/guides/box-mount#secure-your-credentials).

## Next steps

* Run the [Vercel Sandbox Box Mount contract review example](https://github.com/box-community/vercel-box-mount) for a complete agent workflow.
* Review the Box Mount [known limitations](https://developer.box.com/guides/box-mount#known-limitations) before you build on the preview.