How to write prompts that actually work (without resorting to 'act as…')

Why most prompt advice stays useless

Most prompt advice online reads like incantations: "act as a senior copywriter with twenty years of experience." That works a little — and it falls apart the second the task gets more specific than "write me a tweet."

A good prompt gives the model the same four pieces of context a sharp colleague would expect:

1. Audience. Who is this for?
2. Goal. What should the reader do or feel after this?
3. Constraints. Tone, length, structure, what to avoid.
4. Examples. Two short examples beat a paragraph of adjectives.

Five prompt patterns that hold up across tools

1. Brief-style prompt

Write a 600-word blog intro for indie SaaS founders who don't ship landing pages
because they overthink the copy. Tone: blunt but warm. No clichés. End with a
question that invites a real answer, not a CTA.

This is the workhorse. Use it whenever you'd brief a human writer.

2. Reverse brief

Paste an example you like, then describe why.

Here's a paragraph I like (paste it). Use the same pacing and sentence-length
profile, but adapt it to this topic...

3. Section-by-section

For long output, ask the model for an outline first, then per-section drafts. Outlines you can edit are way more useful than drafts you can edit.

4. Constraint prompts

List 10 headlines for X. Each must be under 12 words, contain a number,
and avoid the words "ultimate", "essential", and "powerful".

Constraints force specificity.

5. Critique loop

Here's a draft. Critique it for tone, structure, and weak claims. Suggest
three concrete revisions. I will edit, not you.

The "I will edit, not you" line nudges the model toward review-mode rather than rewriting everything.

What doesn't matter

• "Act as" framing. It moves the needle a little; structured briefs move it more.
• Polite language. "Please" and "thank you" don't change output quality.
• Long system prompts. Most tools strip or compress them. Front-load the most important constraint at the top.

Prompts are briefs, not spells. Treat them that way and you'll spend a tenth of the time producing twice the output.