So, I think that with the agent frameworks that exist now, that wouldn't be very hard to realize. What's needed though would be a full API for the editor that can be tapped into.

Ironically, for creating that, these new age code editor startups would probably have more luck with neovim and it's extensive lua API rather than with vs code. (Of course, the idea with using a vs code fork is about capturing the market share it has).