The phrase "I have briefed" is correct and can be used in written English. You can use this phrase to indicate that you have quickly given someone important information about a topic, often as part of a larger conversation. For example, you might say "I have briefed my team on the project timeline and our goals.".
Michael Braun, who is widely considered the architect of the agency's Afghanistan program, told reporters, "I have briefed more three- and four-star generals over the past eighteen months than the agency has in the last thirty-five years".
"I have briefed him on prices and suggested rates," Louise tells me later, but she admits that it is impossible to keep track of everyone and the prices on the site can only ever be a guideline.
I had briefed him to play something disturbing.
I've briefed retouchers to make thighs skinnier and jowls disappear.
To prepare Katzenberg for our visit to Chelsea, I had briefed him on everything I could find out about her.
I had briefed him about my O'Hara history, revealing that even after being with her on five different occasions, I still felt star struck.
"During the dinner, the President returned to the salacious material I had briefed him about on January 6, and, as he had done previously, expressed his disgust for the allegations and strongly denied them.
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MA of Applied Linguistic, Maquarie University, Australia