[Finbel]

It's so strange. I do all the things you mention and it works brilliantly well 10 times out of 11.

[EagnaIonat]

You are probably doing something others have done before frequently.

I find the LLMs struggle constantly with languages there is little documentation or out of date. RAG, LoRA and multiple agents help, but they have their own issues as well.

[nl]

The OP was working on a "a small JavaScript/HTML web application"

This is a particular sweetspot for LLMs at the moment. I'll regularly one-shot entire NextJS codebases with custom styling in both Codex and Claude.

But it turns out the OP is using Copilot. That just isn't competitive anymore.