Search the person's past daily briefings for a word or a phrase, in the titles and in the text of every story, newest first. Each result has the briefing id, date and title, the passage around the match and, when the match is inside a story, that story's entry id and headline, with the link that opens the briefing right there. Use it for "when did you tell me about X?" or "find that piece on Y", then read the briefing with get_briefing. The match is literal, with no synonyms: if nothing comes back, try a shorter word or another spelling. The reading list has its own search (list_saved).