A useful writing prompt gives the tool something concrete to work with. Start with the reader, the decision they need to make and the facts the piece must include.
For a support article, name the exact task and what the reader has already tried. Provide the verified steps in your own notes. Ask for a draft that puts the answer first and flags any missing detail in brackets.
Review the draft beside the brief. Highlight each factual statement that came from your notes and check every remaining claim before publishing. Keep the brief with the draft so the next editor can see which details were supplied and which need confirmation.