I don't use OpenClaw, but I still run my Claude Code and Codex as limited macOS user accounts and just have a script `become-agent <name> [cmd ...]` that does some sudo stuff to run as the limited user so they don't have any of my environment or directory access, or really any system-level admin access at all. They can use and write to their home directories as usual, which makes things easier to configure since those CLI harnesses really like when $HOME is configured and works as expected.

It's a good compromise between running as me and full sandbox-exec. Multi-user Unix-y systems were designed for this kind of stuff since decades ago.