ComfyUI Workflow Setup for OpenMAIC

Where to store workflows

Place all workflow JSON files in your Next.js public/ folder:

your-project/
  public/
    comfyui-workflow.json          → displays as "Workflow"
    comfyui-anime-style.json       → displays as "Anime Style"
    comfyui-line-art.json          → displays as "Line Art"
    comfyui-portrait.json          → displays as "Portrait"

Naming convention

Filenames must start with comfyui- or contain workflow
Use hyphens to separate words — they become the display name in the UI
The comfyui- prefix is stripped automatically
Example: comfyui-anime-style.json → "Anime Style" in the dropdown

Required nodes in your workflow

The adapter finds nodes by their title (the _meta.title field in the JSON). To set a node's title in ComfyUI: right-click the node → Title → type the name.

Required

Node Title	Recommended Type	Purpose
`Input Prompt`	`PrimitiveStringMultiline`	The image description from OpenMAIC is injected here

Recommended (automatically patched if present)

Node Title	Recommended Type	Purpose
`Width`	`PrimitiveInt`	Output width in pixels — set from the requested aspect ratio
`Height`	`PrimitiveInt`	Output height in pixels — set from the requested aspect ratio
`KSampler`	`KSampler`	Seed is randomised on every generation for varied outputs
`Enable prompt enhancement?`	`PrimitiveBoolean`	Set to `false` to skip LLM prompt enhancement (recommended for speed)

Fallback behaviour

If Width and Height nodes are not found, the adapter automatically falls back to patching the Empty Flux 2 Latent node's width and height inputs directly — so existing workflows without dedicated dimension nodes still work.

Both Width and Height must be present for the explicit node approach to activate — if only one is found the adapter falls back to the latent node method and logs a warning.

Prompt node fallback

If Input Prompt is not found, the adapter falls back to a node titled String (Multiline - Prompt) — so existing workflows still work without renaming anything.

Connecting the nodes

Input Prompt

Connect the output of the Input Prompt node to wherever your prompt text enters the pipeline — typically the text input of a CLIPTextEncode node, or a StringReplace node if you use prompt templating.

Width and Height

Connect the output of each node to the corresponding width and height inputs of your Empty Flux 2 Latent (or equivalent empty latent) node.

Example wiring:

[Input Prompt] ──→ CLIPTextEncode (text)
[Width]        ──→ EmptyLatentImage (width)
[Height]       ──→ EmptyLatentImage (height)

How to export in API format

The workflow JSON must be in ComfyUI API format (not the default save format).

In ComfyUI, go to Settings → enable Dev Mode Options
A new Save (API Format) button appears in the toolbar
Click Save (API Format) — this produces the correct JSON
Place the file in your public/ folder

⚠️ The regular Save button produces a different format that will not work.

Settings in OpenMAIC

Go to Settings → Image Generation
Select ComfyUI Image as the provider
Set Base URL to your ComfyUI address (default http://localhost:8188)
Select your workflow from the Workflows list
Click Test Connection to verify ComfyUI is reachable

Default workflow selection

If no workflow is explicitly selected — for example on the autonomous classroom-media generation path, or before you've clicked a workflow in Settings — the adapter falls back to the first workflow file discovered in public/ (alphabetically by display name). It does not rely on any hard-coded filename, so you don't need a file called comfyui-workflow.json; any single comfyui-*.json you ship will be used as the default. If public/ contains no workflow files at all, generation fails with a clear error asking you to add one.

Deployment topology (important for hosted/production)

The default Base URL http://localhost:8188 assumes OpenMAIC and ComfyUI run on the same host (the typical local / self-hosted setup).

When OpenMAIC runs with NODE_ENV=production, a client-supplied Base URL (x-base-url) that points at localhost, 127.0.0.1, or a private/internal IP range is rejected with HTTP 403 by the SSRF guard (validateUrlForSSRF). This is deliberate and matches the behaviour of the other local providers — it stops a browser client from steering server-side requests at internal services.

Practical implications:

Same-host / self-hosted: works out of the box. Server-resolved defaults are not subject to the client-URL SSRF check, so the localhost:8188 default is fine when OpenMAIC and ComfyUI share a host.
ComfyUI on a different machine in production: point OpenMAIC at ComfyUI over a routable, non-private address (or terminate it behind a reverse proxy on a public hostname). A localhost/private URL sent from the browser in production will be refused.
Local development (NODE_ENV ≠ production): the SSRF check is skipped, so localhost works normally.

Performance tips

Disable prompt enhancement — if your workflow has an LLM-based prompt enhancer, set its enable node to false. Enhancement can add 3–5 minutes per image. The prompts generated by OpenMAIC are already descriptive enough.
The adapter randomises the KSampler seed on every generation automatically.
Output dimensions are calculated from the aspect ratio requested by OpenMAIC and capped at the maxResolution set in image-providers.ts (default 1920×1920).