When the workflow trigger event occurs the trigger will check that any required conditions are met, and if met the "clean-messages" action removes all set messages
"clean-messages"
To remove all messages on the content simply add the "clean-messages" action
If adding the JSON trigger using workflow builder there is no need to include the opening "triggers": JSON markup notation, since it will be added by workflow builder.
A message can be set using the "set-message" trigger action.