I'm using what I call "hermetic agents", where completely sandboxed agents write code and tests from the same specification, where the code writer can't see the test and the test writer can't see the code. The idea is that we can get better quality this way (by avoiding confirmation bias between code and tests). It is more painful to set up however, since you have to distill a spec and guides that the agent would normally hook into using RAG.

It is more like people (agent?) management than coding though. I'm setting up and debugging processes, rather than writing code. I spend a lot of time cursing at and arguing with the agents I'm using to set up hermetic agents (who I can't argue with obviously, but I can have conventional agents go over their logs to figure out how to improve their sandboxed-context).