g.command 'create' do |c|
          c.flag 'name', desc: 'A name for the User Group. Must be unique among User Groups.'
          c.flag 'channels', desc: 'A comma separated string of encoded channel IDs for which the User Group uses as a default.'
          c.flag 'description', desc: 'A short description of the User Group.'
          c.flag 'handle', desc: 'A mention handle. Must be unique among channels, users and User Groups.'