smolvm ships checkpoint-and-branch VMs for agents, v1.16.2 on 2026-09-18, and WebSearch surfaced seven forks above it
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smol-machines/smolvm is a Rust tool for branchable computing, where a branch takes an in-memory checkpoint of a running machine and a machine checkpoint writes it to a durable .smolcheckpoint you can restore elsewhere. It tagged v1.16.2 on 2026-09-18 and v1.16.1 on 2026-09-15, at 6,155 stars and 80 open issues, Apache-2.0, built on libkrun. Fork-and-branch of a live VM is the primitive agent sandboxes have been faking with containers.