02 State the form and the length of the answer

What people usually ask

What should I think about before choosing a heat exchanger for this duty?

What comes back

Twelve headed bullets, each generic, followed by an offer to draft a specification.

Ask this instead

First

I need to choose a heat exchanger for this duty: <fluids, flows,
inlet and outlet temperatures>.
Answer in prose, five sentences, no headings, no bullets.
Each sentence is one question I must answer before choosing,
in the order I should answer them. Stop there. Do not offer
to draft a specification.

Then

Put those five questions in a file called exchanger_checklist.md,
one per line, with a blank line under each for my answer.
Return the whole file in one code block and write nothing
after the closing fence.

Attach: Nothing.

Why it works: the form and the length are set before the content, so the answer arrives in a shape that gets read and the file comes back ready to copy.