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AI Director (Kumi)

Writing a good video prompt is a skill — H3 responds best to prompts that follow the official prompt structure including the shot, the camera, the action and the audio. The Prompt Writer does that work for you: tell it your idea in a sentence, and it writes a production-ready H3 prompt.

You'll find it as the ✨ Prompt Writer button next to the prompt field in the MiniMax H3 tab.

How it works

  1. Type your idea — in any language. A rough one-liner is enough (e.g. "a girl dancing in the rain", or the same in Japanese or Spanish). The finished prompt always comes back in English, which is what H3 understands best. If you've already typed something in the prompt field, it's carried over automatically.

  2. Check the context card. The writer already knows everything you've set up on the tab — the selected task, any reference or frame images you've uploaded, a video reference, the clip duration, whether this is an inpaint edit or a music-video continuation. It reads all of that automatically, so you never have to restate it; the card at the top shows exactly what it's working from.

  3. Add extra instructions (optional). Steer the style without rewriting your idea — e.g. "night scene, cool tones, no dialogue, change the subject to the new reference image".

  4. Pick a mode:

    • Single — one polished prompt for one clip..

    • Storyboard — breaks your idea into a sequence of 2 to 6 connected clip prompts, each written to flow into the next. Costs 1 credit per clip. This pairs perfectly with the Extend task: generate clip 1, then extend it with clip 2's prompt, and so on, to build a full scene far longer than 15 seconds.

  5. Apply. Review the result (in Storyboard mode, switch between clips with the chips), then tap Apply on the prompt you want. It fills the prompt field but doesn't start generating — you can still adjust duration, mode or images before you hit Generate.

Not happy with the result? Rewrite takes you back to the input with everything pre-filled, so you can tweak your idea before spending another credit.

History

Your last results are saved in the writer's History (the clock icon). This matters most for storyboards: generate clip 1 today, and tomorrow you can reopen the same storyboard and apply clip 2's prompt to continue exactly where you left off.

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