Is it possible for the LSP(Roslyn LSP) to return diagnosticProvider with workspaceDiagnostics set to true?

[ZieMcd]

As far as I'm a aware the LanguageServer does have a handler for workspace diagnostics but it seems like it's not returned in server capabilities, I would assume that diagnosticPorvider.workspaceDiagnostics would be set to true.
Is there something I'm missing.

[vst121]

Hi! 👋

The Language Server does have a handler for workspace/diagnostics. However, it’s not advertised in the server capabilities by default, which is why you don’t see it there.

A few things to check:

1. diagnosticProvider.workspaceDiagnostics must be set to true in the server capabilities for the client to know that workspace diagnostics are supported.

2. Some servers implement the handler but don’t expose it in capabilities, either intentionally or due to partial support.

3. Make sure the client you’re using actually requests workspace diagnostics; otherwise, the server might not return anything even if the handler exists.

So you’re probably not missing anything, it’s likely just that the capability isn’t advertised correctly. If you want to experiment, you could try setting workspaceDiagnostics: true in the server initialization and see if diagnostics start coming through.

Hope that helps!