Just 9 commands. After you add the bot to your server, /join is all it takes to get going.
/join to start reading/joinHave the bot join the voice channel you're connected to/leaveMake the bot leave the current voice channel/select_channelSwitch the text channel the bot reads from/clearClear the queued read-aloud messages/pingShow the bot's response time/languageSwitch the language your own messages are read aloud in/voiceChoose the voice model your own messages are read aloud with, per language/inviteInvite the bot to your server/helpShow the command list with links to the website, guide, terms of service and privacy policy