Subject: Decision needed: [specific choice] for [buyer’s goal]

[Name / team],

We need to decide [specific choice]. This supports [goal the buyer
has confirmed].

What we know:
[Relevant finding, source, and date. Include any limit that changes
how the finding should be read.]

What we still need to check:
[Assumption or unanswered question, who will check it, and when.]

Options:
- [Proposed option]: [expected benefit], requiring [budget and team
  effort]. Main risk or dependency: [detail].
- [Alternative, including keeping the current approach]: [benefit
  and tradeoff].

My recommendation is [option], because [reason supported above].

Next step:
Can [owner] [approve, choose, validate, or resolve something specific]
by [agreed date, if there is one]?

If approved, [owner] will [next action]. We will review [success
criteria] at [agreed point] before deciding whether to continue.