While not a plugin, I've had a great experience using the free tier of Gemini CLI over my md-repository. It's rarely run out of context, unlike with code repositories, and it's super easy to feed relevant context just by mentioning files.
Good is a little more proscriptive than that. Its not hard to see the difference between the, we can call them gen1, ai functions and gen2/3 functions we have now. The difference between gpt-3.5 and NotebookLM.
But HN has spent the last 3 years with it's head in the sand wrt stochastic parrots so it tracks that how far we've come is not apparent