Handling argument autocomplete per command

Would it be possible to handle autocompletes through the Command class itself instead and it will be handled accordingly by the interactionCreate event?

Yes https://www.sapphirejs.dev/docs/Guide/application-commands/interaction-handlers/autocomplete#autocomplete-run-method

Got it thanks!!

Follow-up question: what would be the best one to use for subcommands for autocomplete?

in the same way

Just check that the interaction comes from that subcommand name

I see, got it thank you!!