If you are a Nix flake enjoyer, I whipped up something similar to this (Claude Code-only right now) based on microvm.nix: https://github.com/cdata/katsuobushi/tree/main/lib/sandbox

Some highlights:

- Drives Claude Code as a quasi-subagent via "Channels," which supports multi-turn interaction with the host and suspend / resume

- Declarative configuration in the flake of exactly what is copied into the VM (besides the local project), what DNS origins are allowed, etc.

- Shared access to host Nix store / object DB via overlay FS

- Syncs code with the host over a shared (local) Git remote (no worktree mess to manage)

- Devshell commands for quickly dropping into the guest and viewing status of all VMs etc.

- VMs start in a couple of seconds