meeting-brief prepares a pre-meeting document by first confirming the objective (what should be true after this meeting that isn't true before it), then mapping each attendee's stake in the outcome, structuring the agenda with current status and open questions per item, and making decisions explicit: the question being decided, the options, and the named decider. Pre-reads are linked or named, not summarized in the brief itself.
Meetings fail when attendees arrive with different mental models of what the meeting is for. A brief that names the decision, states who makes it, and surfaces the context needed to make it converts a discussion into a decision. The attendee stakes table is the part PMs most often skip — it forces the PM to think about what each person needs from the meeting before the meeting starts, which changes both how the brief is written and who should actually be in the room.
Day 14 follows the alignment memo because the PM has now written the operating principle (Day 13) and structured the pending decision (Day 12). Today they prepare for the leadership meeting where the decision gets made. The brief is the pre-read.