For a similar but lighter weight (and less isolated) tool that uses the OS's sandboxing functionality (bubblewrap on linux, Seatbelt/sandbox-exec on macos) or docker check out cco [1] (note: I built it). It's primarily useful now because it can also sandbox other agents like opencode or codex since Anthropic has added native sandboxing functionality to Claude Code itself now. Their sandbox works similarly, also using bubblewrap and seatbelt, and can be accessed via the /sandbox slash command inside Claude Code [2].
[1]: https://github.com/nikvdp/cco [2]: https://code.claude.com/docs/en/sandboxing