Vercel Sandbox now supports FUSE-based filesystems
Vercel Sandbox can now mount FUSE filesystems — S3 buckets, network shares, any FUSE driver — as POSIX paths, so sandboxed agent code can stream remote data without copying it in first.
**The gist** Vercel Sandbox now supports **FUSE**, so a running sandbox can mount remote storage as a regular path — **S3 buckets** via **Mountpoint for S3**, network filesystems, or any FUSE-compatible driver. The documented flow installs the mount tool inside the sandbox, creates a mount point, and passes AWS credentials through environment variables.
**Why it matters** Sandboxes are where agent-generated code tends to execute, and mounting object storage as a **POSIX path** means that code can stream **large datasets** straight from remote storage, run tools that expect local files against remote sources, and **share state across Sandboxes** through a common filesystem — no copy step before every run.
**The gist** Vercel Sandbox now supports **FUSE**, so a running sandbox can mount remote storage as a regular path — **S3 buckets** via **Mountpoint for S3**, network filesystems, or any FUSE-compatible driver. The documented flow installs the mount tool inside the sandbox, creates a mount point, and passes AWS credentials through environment variables. **Why it matters** Sandboxes are where agent-generated code tends to execute, and mounting object storage as a **POSIX path** means that code can stream **large datasets** straight from remote storage, run tools that expect local files against remote sources, and **share state across Sandboxes** through a common filesystem — no copy step before every run. **Watch out** The credential-passing pattern in the docs **exposes credentials permanently inside the sandbox**; Vercel recommends using **restricted AWS roles** only. If the sandbox runs untrusted or agent-written code, that code can read whatever the mount can reach.