I'd say LLM agent, or multi-agents are still in the very early research/prototype stage.

You can tell because there are papers from Microsoft on this but no product: https://www.microsoft.com/en-us/research/project/autogen/

I also wrote about the L1 to L5 of AI coding here: https://prompt.16x.engineer/blog/ai-coding-l1-l5

I brainstormed a text game-engine powered by an llm, but relying on a non-local llm was offputting. Local llms are getting more and more viable though. A general problem I was running into was that thinking in terms of LLM queries is a very new way of computation design and adapting takes a lot of effort. Then again, my central idea was a bit ambitious too: every game character would have a unique interpretation on what was happening.

Try to build something interesting with Plandex! Perhaps you will be pleasantly surprised. Either way, please let me know how it goes.