What changed
Vercel made Vercel Drives generally available for Vercel Sandbox on Hobby, Pro, and Enterprise. A Drive is persistent storage mounted as a directory: files remain after a sandbox stops, so a later run or a different sandbox can pick up the same workspace.
The launch also adds a useful concurrency primitive. A Drive can be forked into an independent writable Drive, letting parallel workers start from the same files while keeping their changes isolated.
Why it matters
Most agent runtimes still make developers choose between a disposable execution environment and a durable application datastore. Drives fill the middle layer: an agent can keep its working directory, downloaded dependencies, datasets, model files, or file-based memory without making the whole sandbox permanent.
That distinction matters for long-running work. A coding agent can resume a repository in a new sandbox; a research agent can reuse a prepared corpus; and a multi-agent system can give each worker a private branch of the same pre-seeded workspace. The compute can change while the useful state stays put.
Builder takeaway
Treat the sandbox filesystem and the Drive as different kinds of state. Use a Drive for a directory that should outlive the environment, and use a sandbox snapshot when the complete runtime and installed tools need to travel together. For shared read access, mount read-only Drive snapshots; for independent experiments, fork the Drive and let each worker write to its own copy.
Vercel documents a default Drive size of 1 TiB, or 1 GiB on Hobby, with a default maximum quota of 16 TiB. Drives are region-bound and only one sandbox can mount a given Drive read-write at a time, so the storage model is durable and composable rather than an unstructured shared disk.
Bottom line
The important change is not another model release. It is a cleaner lifecycle for agent products: durable working state, disposable compute, and isolated forks. That makes sandbox-backed agents easier to resume, cheaper to warm up, and more practical to run as a team of cooperating workers.