"fast, ephemeral, concurrent dev environments" seems like a superb idea to me. I wish more projects would do it, it lowers the barrier to contributions immensely.

Yeah, this is something I'd like more of outside of Agentic environments; in particular for working in parallel on multiple topics when there are long-running tasks to deal with (eg. running slow tests or a bisect against a checked out branch -- leaving that in worktree 1 while writing new code in worktree 2).

I use devenv.sh to give me quick setup of individual environments, but I'm spending a bit of my break trying to extend that (and its processes) to easily run inside containers that I can attach Zed/VSCode remoting to.

It strikes me that (as the article points out) this would also be useful for using Agents a bit more safely, but as a regular old human it'd also be useful.