You've validated your idea. Now build it.

The prompt sweet spot: 200 words = perfect prompt length.

Under 100 words is too vague. Over 400 words means you're being too prescriptive and limiting the AI's ability to find better solutions.

You've probably heard about "one shotting" the ideal app. We're here to tell you it doesn't work and probably never will.

The 4-Element Prompt Structure

Every great prompt has these 4 elements in this order:

1. WHAT (should happen when users complete this flow)

Bad: "Add user authentication"

Good: "Now that we have a perfect personal dashboard, let's require users to signup/login to view it. Show a small teaser on why they should do this."

2. WHY (Context helps the AI make better decisions)

Bad: "Add a search feature"

Good: "Users need to quickly find specific exercises from a library of 500+. They often only remember partial names or want to filter by muscle group."

Now the AI knows to add autocomplete, partial matching, and filter options—without you specifying those features.

3. HOW (The user experience)

Describe the flow from the user's perspective, not technical implementation.

Bad: "Use a POST request to submit the form data to the API"

Good: "When users submit the form, show a loading spinner, then either show a success message and clear the form, or show validation errors next to each field"

4. WHEN (Important conditions or edge cases)

This prevents 90% of bugs.