Write the outcome, not the artefact
"We need a landing page" describes an artefact. "We need people who found us on LinkedIn to book a call" describes an outcome — and it changes almost every design decision that follows.
Name the audience and the objection
Tell us who reads this and what makes them hesitate. Most design work is answering an objection visually before it gets asked.
Give constraints early
Deadlines, brand rules, technical limits, and the internal opinion that will need convincing. Constraints given up front speed work up; constraints revealed in review send it backwards.
What to leave out
Skip prescribed layouts and skip competitor screenshots as instructions. Share them as references for tone, not as specifications to copy.