Self-hosting would be cool too, but for both Lobster and Goose I've tried to keep it simple for people to build the language in any environment, which is why its still all in C++.
I don't use any "skills". From what I can see, the #1 way an AI produces "good code" is to simply work in the context of existing good code. I don't need to hold it by a style guide, it seems to infer that from context just fine. At least Fable does, other models less so.
Even if you don't have such an example, pick a project that you think has "good code" (even if it is not your own), point the LLM at it, tell it to have a deep read of the code, and come up with a very in-depth coding guideline in a .md file with code patterns etc. Then put that .md in your new project and tell it to follow it.
"Just Git Gud First" - Wouter van Oortmerssen
LLMs are pattern matching machines. Your code is the base template that will determine all patterns moving forward. No amount of context engineering or prompting can save your code from itself.
Pragmatically, it suggests we need a much greater investment in code quality, and much less hand-wringing over AI tooling.
For context: I'm very active on the Goose discord (and have been following WvO's languages since Lobster was announced on Google Groups eons ago). I goof around there too, and forgot for a moment that outside of that chat it wouldn't be obvious that I'm being tongue-in-cheek.