AIME MUD engine

I would like to have posibility to suppress command's messages when trigger is successfully done. For example, I need to allow only certain objects to be put into certain container. When I deny them to be put in the special with preput_XXXX trigger with return_invalid_criteria() then everything is allright, since I notified player via send_actor myself. But I still see "You put the Something in the Container." message if trigger was successful, in spite of I already displayed the message I needed in that case. So I think about some, say, quiet_success() function which tells command not to display anything on success.
Perhaps there is some way to do it already, and I don't know about it, hmm?