Phoenix.new is a good example of a coding agent that can fully bootstrap realtime Elixir apps using Phoenix LiveView: https://phoenix.new/
I also use coding agents with Elixir daily without issues.
See this is what kills me about these things. They say they built this system that will build apps for you, yet they advertise it using a website that chews through my CPU and GPU. All this page does is embed a YouTube video, why is my laptop's fan going full blast? And I'm supposed to trust the code that emanates from their oracle coding agent? What are we doing here people??