A technical brief should let a reader understand the decision before they inspect the details. A useful order is: the problem, the proposed behaviour, the trade-offs, and the evidence needed to review it.
Use a concrete example early. Describe what happens today and what should happen after the change. Keep implementation choices separate from user-visible requirements so reviewers can question the design without losing sight of the outcome.
End with open questions and a clear next action. Distinguish decisions that are already made from assumptions that still need validation. This prevents a polished document from appearing more settled than it is.
Markdown is a convenient source for this structure because headings, lists, and links are easy to maintain. dochost can publish that source as a readable web page without requiring a repository or deployment pipeline for the document itself. Keep sensitive implementation details out of a public copy and retain the editable source.
Before circulation, ask whether a reader who missed the meeting can explain the problem and identify what feedback is requested. If they cannot, revise the brief's context rather than adding more detail to the middle.