A ComfyUI workflow that ran once and cannot be repeated is hard to build on. This skill guides your coding agent from prerequisites to a checked result: run one known workflow, diagnose the first failing step, and keep a recipe you can rerun.
Your agent inspects your exported API workflow and the local server's node definitions, lists missing nodes and models, and keeps the original graph and seed as a baseline. It changes one input at a time, shows the proposed inputs before queuing one image, and saves the output with its prompt ID. A job still running is collected by that ID rather than submitted again.
You keep the API workflow, prompt, seed, model source and license, and an expected-result note together for the next image. Identical pixels across hardware and versions are not promised.
You need a running ComfyUI instance, a compatible model and its companion files, and an agent with terminal access; start with the image models guide. Provider accounts, model weights, GPU compute and hosting are not included.