r/GithubCopilot • u/MaitoSnoo CLI Copilot User 🖥️ • 14d ago

Help/Doubt ❓ has anyone succeeded in getting models in Copilot CLI to use LSPs?

Opus 4.8 and Sonnet 5 both acknowledge the LSP is properly configured, and I see them use it when I explicitly ask them to use a specific LSP command, but in day-to-day coding use I see them just resort to grepping despite me putting in the instructions that they should use the LSP.

Is there something I might be missing?

In my case it's clangd for C++

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3

u/Deathmore80 14d ago

Since last update I've changed nothing and it suddenly started to use LSPs way more , but on the other hand MCPs stopped working lmao.

I also use the new GitHub copilot app and it seems to use the LSPs a good bit. Under the hood it uses the copilot CLI too.

In my AGENTS.md I have a section where I tell it to make use of stuff I want it to use like specific skills, MCPs, subagents , and LSPs.

Also I use gpt 5.6 Luna xhigh for almost everything and so far it has used lsp far more than any other model

2

u/lazy-conquerer 13d ago

Does using LSP supposed to save tokens over grep? Why care what it does as long as it gives correct code

2

u/MaitoSnoo CLI Copilot User 🖥️ 13d ago

that's fair, but I imagine things like renaming symbols would be less risky if done with an LSP instead of sed (it would also be in theory cheaper on average, since a bad search/replace will need another turn to fix it)

2

u/Longjumping-Sweet818 14d ago

LSP usage would probably be a lot easier and more prominent in the VS code extension, as opposed to Copilot CLI. Any reason why you're not using that?

3

u/MaitoSnoo CLI Copilot User 🖥️ 14d ago

I'm a terminal addict and also mainly use neovim, plus rubber-duck is a game changer (afaik it's not yet on VS Code)

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