Only some LSPs support server configuration schema?

[nyonson]

Some of my installed servers show a "Server configuration schema" which seems like a nice way to discover how to configure a particular server. However, not seeing it under gopls. Is it only supported on some servers?

[williamboman]

Hello! Yes, that's the situation currently. Most schemas originates from its corresponding VSCode extension, where it can be found in the $.contributes.configuration path of the extension's package.json manifest, for example this one. This is just a regular JSONSchema structure. Unfortunately, these schemas have a tendency to also incorporate settings that only apply to the VSCode client extension itself (and not the underlying, editor-agnostic, LSP server implementation). Some servers, for example pylsp, will provide a standalone schema definition, which is really nice as it's a fully editor-agnostic schema.

These schemas are currently mapped in this gist, and are used in this script to generate it into version controlled Lua tables (which then is used by the :LspInstallInfo UI). I'm sure there are servers missing in the gist, which I'd be happy to add. Long-term it'd however be really nice if LSP servers were to separate VSCode client extension from the LSP server implementation a bit more!