AI Prompt Card Generator

You are helping me draft a compact product spec for a creator tool.
Topic: a tiny useful web app for creators.
Tone: plain, specific, and easy to act on.
Output format: Creative brief.

Instructions:
Return a creative brief with: one-sentence concept, target user, key interaction, visual direction, success criteria, and three launch-ready taglines.

Constraints:
- Prefer visible interaction over explanation.
- Keep the first version small enough to finish in one sitting.
- Make the result practical enough for a solo builder to execute.
- If something is uncertain, make a reasonable assumption and state it briefly.

Before the final answer, silently check that the result has a clear user action, a visible first screen, and one measurable success signal.