ComfyUI MiniMax H3 Prompt Writer
A ComfyUI UI extension that turns a plain-language creative brief and optional reference images, video, or audio into an editable MiniMax H3 video prompt, without running the model or queuing a render itself.
H3 Prompt Writer is a prompt-authoring workspace built into ComfyUI for MiniMax H3 video generation. A user writes a plain-language creative brief, attaches optional image, video, or audio references, and the extension formats an editable prompt in the structure H3 expects; it only writes that prompt text and prepares reference media, leaving the actual model run to the user's existing H3 workflow.
Its sequence mode drafts several related prompts from one brief with shared references and per-chunk edits, and a media panel offers a composer for building contact-sheet collages, an editor for cropping and trimming images and video, and a floating panel for dragging prepared media into a workflow. Prompt generation can call a local or remote model, including Ollama, a direct GGUF file, an external llama.cpp server, or a hosted API.
It ships as a ComfyUI extension and, separately, as a standalone Windows build, with a light theme and adjustable interface size.