Interesting! Personally I'm not eager to spend tokens on having my own harness, sandbox etc. It's much much more feasible by spending tokens. But it does feel like a distraction and that I end up owning it. As in: a continuing distraction.

So I've been experimenting for these purposes with omnigent as a way to be less locked into a single provider and for its sandbox abstraction. And I've also tried openshell for sandboxing. Hoping those two will keep improving.