I wrote my own tooling around the raw LLMs:

I can tick files in Vim, those get concatenated into a prompt. Along with a feature request. Plus an instructions file that tells the LLM how to reply. Plus my general "rules for good code" file, plus one "rules for good code" file per language involved, plus a project specific overview file. The LLM then answers with a list of changes it wants to make to the code. My tooling then applies those changes and I look at them via "git diff". If I like it, I commit. If not, I change one of the prompts and start the process again.

Instead of replying with code changes, the LLM can also decide to request more files. I wrote a little DSL for that.

I described the beginnings of this workflow last July:

https://www.gibney.org/prompt_coding

Feels like an eternity ago. I think I will write a new blog post this July and describe how the workflow has evolved over the past year.