Box Mount now lets agents in Vercel Sandbox read and write Box files
Vercel says Box Mount now runs in Vercel Sandbox, letting agents read and write Box files through standard filesystem operations. The feature is in private preview, and access must be requested from Box.
- Box Mount lets agents in Vercel Sandbox read and write Box files through standard filesystem operations.
- It syncs a Box folder with a directory inside the sandbox.
- Users should unmount before stopping the sandbox so the agent's output is in Box after deletion.
- The sync process and agent run as separate sandbox users, keeping Box credentials apart from the agent's workspace.
- Box Mount is in private preview, with access requested from Box.
How Box Mount works
According to Vercel, Box Mount syncs a Box folder with a directory inside the sandbox. An agent running in Vercel Sandbox can then work with those files the way it would with any other files on a filesystem, using standard read and write operations rather than a custom integration.
The workflow has one step developers need to remember. Users should unmount before they stop the sandbox. Vercel says that once this is done, everything the agent wrote is in Box after the sandbox is deleted. In practice, the sandbox can be temporary while the output the agent produced stays in the user's Box storage.
Contract-review example and credential separation
Vercel points to a contract-review example to show the setup in use. In it, an agent uses AI Gateway to review a synthetic contract in Vercel Sandbox and then saves the review back to Box.
The design also addresses credential handling. Vercel says the sync process and the agent run as separate sandbox users. This keeps the Box credentials separate from the agent's workspace, so the agent works with the mounted files without sharing a workspace with the credentials used for syncing.
Availability and what it means
Box Mount is in private preview. Vercel says interested teams should request access from Box, then follow the Box Mount documentation to set it up in Vercel Sandbox.
For developers building agents that handle documents stored in Box, the release offers a way to use ordinary filesystem operations inside a sandbox and keep the results in Box after the sandbox is gone. Because access is limited to private preview, wider availability will depend on Box granting access. The source does not give details on pricing or a general release date.
Vercel: Box Mount now runs in Vercel Sandbox
