How to remove desc messages from rspec when using thor?

Now I am using thor in a rails project.

I wrote these codes:

lib/tasks/my_task.rb

require 'thor'

module Tasks
  class MyTask < Thor
    desc 'My Batch', 'This is my awesome batch'
    option :date
    def execute(type)
      # do_something
    end
  end
end

Tasks::MyTask.start(ARGV)

spec/lib/tasks/my_task_spec.rb

# do_some_test

The problem is when I run bundle exec rspec, it showed:

Run options: exclude {:heavy=>true}
..................................................................................................................................................................................................****************************...................................................
........................................................************.......................................................................................................................................................................................................******
***..............................................................................................................Commands:
  rspec help [COMMAND]  # Describe available commands or one specific command
  rspec My Batch          # This is my awesome batch

.................................................................................................................................................................................................................................................................................
.............................................................................................................................................................................................................................

Why the desc messages been shown here? How to config to remove them?