I have sublime text 23.0 Build 3143 with VHDL and LSP installed. I have vhdl-tool in my path. I have set the settings described here https://www.vhdltool.com/sublime in my LSP.sublime-settings (user settings). I don't see any change in sublime after i've done these steps. Not sure what else i could check to see if anything was not properly installed or so..
Make sure you are running sublime from the directory containing the vhdltool-config.yaml file. Or, equivalently, open that directory from within sublime.
You can also find sublime-lsp debugging instructions here: https://lsp.readthedocs.io/en/latest/#troubleshooting