I suspect he has given some 'guidance'. Also worth noting that the President is taking this action at the 'request and recommendation of the Attorney General. AG Barr is requesting the declas.
Yup, in other words Agency heads we’re fighting Barr on information he wants.
Remember Barr said just a few days ago the answers he was getting from them were not adequate or making sense.
So Trump just took awAy their ability to obstruct, hide and deny.