Add pre-made ComfyUI workflows + exact node ID mapping for Open WebUI

The #1 friction point: users had to manually build a ComfyUI workflow,
export it in API format, then figure out which node IDs to enter in
Open WebUI. Now:

- comfyui-workflow-default.json: SD 1.5 text-to-image (512x512)
- comfyui-workflow-sdxl.json: SDXL text-to-image (1024x1024)

Upload either file directly into Admin → Settings → Images → Upload.
Then fill in the node ID mapping: Prompt=6, Model=4, Width/Height=5,
Steps/Seed=3.

Also fixes:
- Clear instructions to remove stale sk-1234 API key (ComfyUI doesn't
  use API keys)
- Explains the localhost:1111 error (stale AUTOMATIC1111 config in
  Open WebUI's database — just re-enter the ComfyUI URL)
- Updated setup steps to use setup-image-models.sh instead of manual
  wget/docker cp

https://claude.ai/code/session_01PtYTPherSJaxDEVPgF6Nxu

README.md

@@ -70,6 +70,8 @@ sudo systemctl status local-ai
 | `comfyui-import-lora.sh` | 97 | Copies a LoRA into ComfyUI and prints workflow setup instructions. |
 | `comfyui-install-ipadapter.sh` | 185 | Installs IP-Adapter nodes + models into ComfyUI for reference-image workflows (same face, different settings). |
 | `setup-image-models.sh` | 200 | **GPU-aware** image model installer. Detects VRAM, offers appropriate SD/SDXL/Flux models, installs into InvokeAI and/or ComfyUI. |
+| `comfyui-workflow-default.json` | — | Pre-made ComfyUI workflow for SD 1.5 (512x512). Upload directly into Open WebUI. |
+| `comfyui-workflow-sdxl.json` | — | Pre-made ComfyUI workflow for SDXL (1024x1024). Upload directly into Open WebUI. |
 
 ### Which setup script should I use?
 
@@ -225,12 +227,27 @@ This is how "generate an image of..." works from chat.
 3. **Engine:** Select `ComfyUI`
 4. **ComfyUI Base URL:** `http://comfyui:8188`
    - (These should already be filled in from the env vars set during setup)
-5. Click the **checkmark/verify** button — should show "Connected"
+5. Click the **refresh/verify** button (circular arrow icon) — should show "Connected"
-6. **Import Workflow:** Click and upload your `workflow_api.json`
+   - If you see an error about `localhost:1111`, that's a stale config. Just clear the
-   - If you don't have one yet, see [ComfyUI workflow setup](#setup-comfyui--open-webui-recommended)
+     URL field and re-enter `http://comfyui:8188`, then save.
-7. **Map nodes:** After importing, map the **prompt node** to the CLIPTextEncode
+6. **ComfyUI API Key:** Leave blank (no auth needed on local network)
-   node (or whichever node takes the text prompt)
+   - If there's a default `sk-1234`, clear it — ComfyUI doesn't use API keys
-8. Click **Save**
+7. **ComfyUI Workflow:** Click **Upload** and select one of the pre-made workflows:
+   - `comfyui-workflow-default.json` — SD 1.5 (512x512, works on 4GB+ VRAM)
+   - `comfyui-workflow-sdxl.json` — SDXL (1024x1024, needs 8GB+ VRAM)
+   - These files are in your `~/docker/ai-stack/` directory
+8. **ComfyUI Workflow Nodes** — after uploading, fill in these node IDs:
+
+   | Field | Node ID | Why |
+   |-------|---------|-----|
+   | **Prompt** → text | `6` | Node 6 is the positive CLIPTextEncode — this is where your chat prompt goes |
+   | **Model** → ckpt_name | `4` | Node 4 is the CheckpointLoaderSimple — picks which SD model to use |
+   | **Width** → width | `5` | Node 5 is the EmptyLatentImage — controls output width |
+   | **Height** → height | `5` | Same node 5 — controls output height |
+   | **Steps** → steps | `3` | Node 3 is the KSampler — controls generation steps |
+   | **Seed** → seed | `3` | Same node 3 — controls randomness seed |
+
+9. Click **Save**
 
 > **No workflow yet?** You need to first open ComfyUI at `http://<ip>:8188`,
 > build or load a workflow, enable Dev Mode (gear icon), and click
@@ -409,35 +426,50 @@ Open WebUI natively supports these image generation engines:
 
 If you selected ComfyUI during setup, the environment variables are already configured. You just need to install a model and set up a workflow.
 
-#### Step 1: Install a Stable Diffusion model in ComfyUI
+#### Step 1: Install a Stable Diffusion model
 
 ```bash
-# Open ComfyUI at http://<ip>:8188
+# GPU-aware — detects your card and installs the right model:
-# Use the built-in Model Manager to download a model, or manually:
+./setup-image-models.sh
-docker exec comfyui bash -c "cd /opt/ComfyUI/models/checkpoints && \
-  wget -q 'https://huggingface.co/stabilityai/stable-diffusion-xl-base-1.0/resolve/main/sd_xl_base_1.0.safetensors'"
-```
 
-Or download any `.safetensors` checkpoint and copy it in:
+# Or manually:
-```bash
 docker cp ~/Downloads/my-model.safetensors comfyui:/opt/ComfyUI/models/checkpoints/
 ```
 
-#### Step 2: Create and export a workflow
+#### Step 2: Upload a workflow into Open WebUI
 
-1. Open ComfyUI at `http://<ip>:8188`
+Pre-made workflows are included — no need to build one in ComfyUI:
-2. Build or load a workflow (the default text-to-image workflow works)
-3. Click the **gear icon** → enable **Dev Mode**
-4. Click **Save (API Format)** — this downloads `workflow_api.json`
 
-#### Step 3: Configure Open WebUI
+| Workflow file | Model | Resolution | VRAM |
+|--------------|-------|-----------|------|
+| `comfyui-workflow-default.json` | SD 1.5 | 512x512 | 4GB+ |
+| `comfyui-workflow-sdxl.json` | SDXL | 1024x1024 | 8GB+ |
 
-1. Open WebUI → **Admin** → **Settings** → **Images**
+1. Go to **Admin** → **Settings** → **Images**
 2. Set **Engine** to `ComfyUI`
-3. Set **URL** to `http://comfyui:8188` (container networking, already set via env vars)
+3. Set **ComfyUI Base URL** to `http://comfyui:8188`
-4. Click **Import Workflow** and upload your `workflow_api.json`
+4. Click the **refresh icon** — should show connected
-5. Map the **prompt node** (usually the KSampler or CLIPTextEncode node)
+5. Clear the **ComfyUI API Key** field (ComfyUI doesn't use API keys)
-6. Save settings
+6. Click **Upload** next to **ComfyUI Workflow**
+7. Select `comfyui-workflow-default.json` (or `sdxl` version)
+8. Fill in the **ComfyUI Workflow Nodes** — these tell Open WebUI which
+   node in the workflow handles each parameter:
+
+   | Field | Node ID |
+   |-------|---------|
+   | **Prompt** → text | `6` |
+   | **Model** → ckpt_name | `4` |
+   | **Width** → width | `5` |
+   | **Height** → height | `5` |
+   | **Steps** → steps | `3` |
+   | **Seed** → seed | `3` |
+
+9. Click **Save**
+
+> **Custom workflows:** If you build your own workflow in ComfyUI, enable
+> Dev Mode (gear icon) → click **Save (API Format)** → upload that JSON file
+> instead. The node IDs will be different — check each node's ID number
+> in ComfyUI and enter them in the mapping above.
 
 #### Step 4: Generate images in chat
 

comfyui-workflow-default.json

@@ -0,0 +1,59 @@
+{
+  "3": {
+    "class_type": "KSampler",
+    "inputs": {
+      "cfg": 7.5,
+      "denoise": 1,
+      "latent_image": ["5", 0],
+      "model": ["4", 0],
+      "negative": ["7", 0],
+      "positive": ["6", 0],
+      "sampler_name": "euler_ancestral",
+      "scheduler": "normal",
+      "seed": 42,
+      "steps": 30
+    }
+  },
+  "4": {
+    "class_type": "CheckpointLoaderSimple",
+    "inputs": {
+      "ckpt_name": "v1-5-pruned-emaonly.safetensors"
+    }
+  },
+  "5": {
+    "class_type": "EmptyLatentImage",
+    "inputs": {
+      "batch_size": 1,
+      "height": 512,
+      "width": 512
+    }
+  },
+  "6": {
+    "class_type": "CLIPTextEncode",
+    "inputs": {
+      "clip": ["4", 1],
+      "text": "a beautiful landscape painting"
+    }
+  },
+  "7": {
+    "class_type": "CLIPTextEncode",
+    "inputs": {
+      "clip": ["4", 1],
+      "text": "bad quality, blurry, ugly, deformed"
+    }
+  },
+  "8": {
+    "class_type": "VAEDecode",
+    "inputs": {
+      "samples": ["3", 0],
+      "vae": ["4", 2]
+    }
+  },
+  "9": {
+    "class_type": "SaveImage",
+    "inputs": {
+      "filename_prefix": "ComfyUI",
+      "images": ["8", 0]
+    }
+  }
+}

comfyui-workflow-sdxl.json

@@ -0,0 +1,59 @@
+{
+  "3": {
+    "class_type": "KSampler",
+    "inputs": {
+      "cfg": 7,
+      "denoise": 1,
+      "latent_image": ["5", 0],
+      "model": ["4", 0],
+      "negative": ["7", 0],
+      "positive": ["6", 0],
+      "sampler_name": "euler_ancestral",
+      "scheduler": "normal",
+      "seed": 42,
+      "steps": 30
+    }
+  },
+  "4": {
+    "class_type": "CheckpointLoaderSimple",
+    "inputs": {
+      "ckpt_name": "sd_xl_base_1.0.safetensors"
+    }
+  },
+  "5": {
+    "class_type": "EmptyLatentImage",
+    "inputs": {
+      "batch_size": 1,
+      "height": 1024,
+      "width": 1024
+    }
+  },
+  "6": {
+    "class_type": "CLIPTextEncode",
+    "inputs": {
+      "clip": ["4", 1],
+      "text": "a beautiful landscape painting"
+    }
+  },
+  "7": {
+    "class_type": "CLIPTextEncode",
+    "inputs": {
+      "clip": ["4", 1],
+      "text": "bad quality, blurry, ugly, deformed"
+    }
+  },
+  "8": {
+    "class_type": "VAEDecode",
+    "inputs": {
+      "samples": ["3", 0],
+      "vae": ["4", 2]
+    }
+  },
+  "9": {
+    "class_type": "SaveImage",
+    "inputs": {
+      "filename_prefix": "ComfyUI",
+      "images": ["8", 0]
+    }
+  }
+}