Adudeguyman/ComfyUI-Fantastic-MiniMaxH3-PromptBuilder

What it solves

The MiniMax H3 video model requires a highly specific, structured prompt format involving shot timings, speaker IDs, and reference media tags. Because the official tool for generating these prompts is not open-source, users previously had to write them manually or risk errors. This project provides a user-friendly interface to build these prompts correctly and manage reference media within ComfyUI.

How it works

This node pack adds a specialized editor to ComfyUI that uses fillable templates for all five MiniMax H3 modes. As you type, the editor performs live checks against the official H3 prompt rules, flagging errors like missing references or incorrect formatting before you run a render. It includes a media loader that lets you drag and drop images, videos, and audio, automatically generating the correct tags (e.g., <Picture 1>) which you can insert into your text with a single click.

Who it’s for

This tool is designed for ComfyUI users working with the MiniMax H3 video model who want to avoid the tedious and error-prone process of manually formatting complex prompts and managing reference media tags.

Highlights

• Live Validation: Flags shot numbering, dialogue formatting, and missing references while you type.
• Click-to-Insert Tags: Reference media appears as thumbnails; clicking one drops its corresponding tag directly into your prompt.
• Non-Destructive Editing: Includes a built-in trim and crop editor for clips and images that does not modify your original source files.
• Integrated Guide: Features a built-in, searchable version of the official MiniMax H3 prompt guide.
• Draft Mode: Provides a scratchpad to prepare your next prompt and reference set without interrupting your current workflow.
• Masked Editing Support: Includes tools to mask specific areas of a video for targeted regeneration while keeping the rest of the frame untouched.