That's the question I'm hoping to answer as I write the rest of this guide, which I expect to take several months: https://simonwillison.net/2026/Feb/23/agentic-engineering-pa...
I'm not sure anyone has a confident answer to that yet though - I certainly don't.
Simon, I'd be interested in a voice conversation with you on this topic. I've developed my own chain-of-thought system that is very different from what others are doing. Mine is a Socrate Agent that leads the developer, does not write their code, but guides them to become a better developer. It completely opposite the direction the larger industry seems to be going. Augmented synergy between the AI and developer, not the AI coding and the human overseeing.