vscode-ruby version: 0.14Make sure you have ruby, ruby-debug-ide and ruby-debug-basex19 installed before submitting your issue -- thank you !
Autocompletion works and I get the suggestions for an array:
#each
#each_index
#empty?
#eql?
Autocompletion doesn't work

I can see some permission errors in the developer tools
vscode.txt
press Ctrl.space
The rcodetools gem hasn't been updated in over 8 years. I doubt it's maintained or supported anymore.
I published a separate VS Code extension that might suit your needs: Ruby Solargraph
It works well as an addition to the Ruby extension with no overlapping functionality outside of replacing the rcodetools version of code completion.
Closing for issue cleanup. Apologies if this is still an issue. We are working to improve the core extension experience.
Most helpful comment
The rcodetools gem hasn't been updated in over 8 years. I doubt it's maintained or supported anymore.
I published a separate VS Code extension that might suit your needs: Ruby Solargraph
It works well as an addition to the Ruby extension with no overlapping functionality outside of replacing the rcodetools version of code completion.