We've found LSP pretty easy to extend for our purposes, without any explicit help from the protocol. Check out the `extension-*.md` files at https://github.com/

We've found LSP pretty easy to extend for our purposes, without any explicit help from the protocol. Check out the `extension-*.md` files at https://github.com/sourcegraph/language-server-protocol https://github.com/sourcegraph/language-server-protocol for our extensions. Some of them we hope to upstream, some of them only make sense for Sourcegraph.