g.command 'invite' do |c|
          c.flag 'email', desc: 'Email address of the new user'
          c.flag 'channels', desc: 'Comma-separated list of IDs (not names!) for channels, which the new user will auto-join. Both channel IDs for public channels and group IDs for private chanels work.'
          c.flag 'first_name', desc: 'Prefilled input for the "First name" field on the "new user registration" page.'
          c.flag 'last_name', desc: 'Prefilled input for the "Last name" field on the "new user registration" page.'