I have been thinking about this for months and I am more convinced every time. A prompt is not a technical instruction for a machine. A prompt is a creative brief. And designers are probably the best prepared people in the world to write good prompts because we have spent our entire careers writing good briefs.
The anatomy of the brief and the prompt
Think about a creative brief. It has a clear objective, defines the audience, establishes brand constraints, indicates the tone of communication, mentions visual references and leaves room for creative interpretation within those boundaries.
Now think about a well-written prompt for Midjourney or any generative AI. It has a clear visual objective, defines the style, establishes technical constraints like aspect ratio and detail level, indicates the mood, mentions lighting or composition references and leaves room for the AI to interpret within those parameters.
It is the same muscle. The same skill. The same way of thinking.
Why designers write better prompts
A designer knows that saying I want something modern and clean does not give a creative team enough information to produce something useful. In the same way they know that writing I want a pretty app design will not give AI anything worthwhile.
We know how to think in layers. We know that a visual result is the sum of decisions about composition, color palette, typography, hierarchy, negative space, lighting and context of use. When we write a prompt we are decomposing a mental image into those layers and communicating them in a structured way.
Someone without visual training tells AI: make me a logo for a coffee shop. A designer tells it: minimalist logo for a specialty coffee shop, single ink in dark brown, geometric sans-serif typeface, Japanese design inspiration, no figurative elements, type only. The result of those two prompts is vastly different.
Prompt engineering is applied design thinking
Every time I write a prompt I am doing the same thing I do when I design. I am defining a problem, establishing constraints, imagining a result and communicating it in a way that someone else can execute. Before that someone else was a design team or a freelancer. Now it is an AI.
The mental process is identical. The difference is that response time went from days to seconds. And that does not devalue the process, it amplifies it.
If you know how to write a good brief you already have half the path to writing a good prompt. The other half is knowing the capabilities and limitations of the tool that will execute that brief.
And that is learned by doing. Like everything in design.