Our token budget is also high so honestly I don't plan much. Mostly just throw work item and as much related context I'm aware of at whatever is the latest decent model (opus for a while and lately gpt sol) and let it do its thing. If I were more budget constrained I'd plan more up front and delegate bits to cheaper subagents I suppose.

I do basically the same. Have multiple Docker sandboxes where I let agents yolo.

Must say I don't really love the setup. The workflow is not as frictionless as just opening Claude Code used to be.