ComfyUI Workflows in OpenMontage

Use this skill before calling comfyui_image, comfyui_video, or comfyui_music, and when converting a community ComfyUI workflow into an OpenMontage tool call.

Server Contract

• ComfyUI must be running before the tool can generate. The default server is http://localhost:8188; override it with COMFYUI_SERVER_URL.
• Running separate ComfyUI instances per capability (different GPU, different model set)? COMFYUI_IMAGE_SERVER_URL / COMFYUI_VIDEO_SERVER_URL / COMFYUI_MUSIC_SERVER_URL each override COMFYUI_SERVER_URL for that one tool only. Optional -- a single-server setup needs none of these.
• Health and hardware status come from GET /system_stats.
• Jobs are submitted to POST /prompt, completed outputs are read from GET /history/{prompt_id}, and artifact bytes are downloaded with GET /view.
• Long waits (video, music) prefer ComfyUI's websocket feed for immediate completion/error detection and transparently fall back to REST polling if websocket-client isn't installed. Either way, a timeout is recoverable: pass the error's prompt_id back in as resume_prompt_id to resume waiting on the same job instead of resubmitting it.
• Export workflows with ComfyUI's API-format JSON, not the UI layout format. If a downloaded workflow will not submit, re-export it from ComfyUI with API format enabled.

Partner Nodes are hosted

• gemini_omni_flash, seedance_2.5, and minimax_h3_api in comfyui_video are official ComfyUI Partner Nodes. They call hosted APIs and require network access, a logged-in Comfy account, and prepaid credits.
• Do not describe Partner Nodes as local, offline, or free merely because the graph runs in a local ComfyUI process.
• minimax_h3_local is a separate open-weight path. It requires the official MiniMax H3 workflow exported in API format, its output_node, and the model stack reported by the tool.

Choosing a Workflow