Summary
On July 28, 2026, Vercel added forking to Vercel Sandbox. Sandbox.fork() creates a new sandbox seeded from the source sandbox's latest saved snapshot and inheriting its configuration, so agents and workflows can branch an environment instead of rebuilding one from scratch.
What changed
Vercel Sandbox now exposes Sandbox.fork(), which creates a new sandbox from the source's latest saved snapshot and inherits its configuration.
Why it matters
Forking turns an agent sandbox into a branchable primitive: a coding or research agent can snapshot a working environment and spin off parallel variations to try competing approaches, then keep the winner. That maps directly onto how autonomous agents explore solution spaces, and it cuts the cold-start cost of every new attempt.
Evidence excerpt
Sandbox.fork() creates a new sandbox seeded from the source's latest saved snapshot.