chatGPT ignores openAPI instructions sometimes

I have this description for a field

The exact description that will generate the graphic that will be printed on the garment. You do not need to say Create, or T-shirt, etc. Just use the exact description of the image you want.

chatGPT sometimes ignores it and creates prompts like this:
“Create an abstract design for a hoodie inspired by Mark Rothko’s color field paintings. …”

I can steer it by asking it not to do that.
But the issue is that regular chatGPT customers won’t inspect the prompt used and know how to debug.

What is the best practice around hard vs soft guardrails?

More context: The plugin creates apparel. Other fields ask for that information. Message for access.

Here is how to use it.