Aider uses Treesitter to improve code generation. https://aider.chat/2023/10/22/repomap.html

Aider: https://github.com/paul-gauthier/aider

It is state of the art on SWE-Bench and SWE-Bench Lite. https://aider.chat/2024/06/02/main-swe-bench.html

This is actually what we are working on adding next! We are working on code crawling and a vector search for better context gathering. Stay tuned for some more info on this

I hope your LSP client module ends up being reasonably isolated and reusable! I found that client support for LSP is the weakest part of the ecosystem. The story generally seems to be "the editor has a bespoke client and there is never a reason to use LSP from any other context".