LM Studio → ComfyUI Image Generator

ComfyUI MCP Server

An MCP (Model Context Protocol) server that exposes ComfyUI image & 3D generation as a single tool.
It auto‑classifies your prompt (people, buildings, general, or 3D) and picks the right workflow automatically.

Perfect for AI assistants – connect it via MCP and let your LLM generate assets directly.

Features

• 🧠 Smart prompt classification – detects if you want a person, building, or 3D model.

• 🖼️ 2D generation – uses your own ComfyUI workflows (general, people, buildings).

• 🤖 3D generation (Hunyuan3D) – generates a reference image first, then runs the 3D workflow.

• 🔌 MCP Tool – exposes generate_asset_tool(prompt, workflow_type, size) to any MCP client.

• 📂 Workflow folder – drop your .json workflows into ./workflows/.

Setup

1. Prerequisites

• Python 3.10+

• ComfyUI running locally with API enabled (default http://127.0.0.1:8188).

• Your ComfyUI workflows exported as .json files.

2. Install dependencies

pip install -r requirements.txt

3. Place your workflows

Put your ComfyUI workflow JSON files into the workflows/ folder. The filenames must match exactly:

general.json

people.json

buildings.json

3d_simple.json

⚠️ Important for 3D: your 3d_simple.json MUST contain a LoadImage node with the ID "26". The code injects the uploaded reference image into workflow["26"]["inputs"]["image"].

4. Configure (optional) Create a .env file to override the ComfyUI URL:

text COMFY_URL=http://127.0.0.1:8188 If not set, it defaults to http://127.0.0.1:8188.

Usage Run the MCP server bash python mcp_server.py The server will start and register the tool generate_asset_tool.

Tool parameters prompt (str, required): description of what to generate.

workflow_type (str, optional): "people", "buildings", "general", or "3d_simple". If omitted – auto‑detected.

size (str, optional): "512x512", "512x768", or "768x512". If omitted – auto‑selected.

Example from MCP client json { "tool": "generate_asset_tool", "arguments": { "prompt": "a futuristic cyberpunk girl with neon hair" } } → Auto‑detects people, uses people.json with size 512x768, returns an image URL.

json { "tool": "generate_asset_tool", "arguments": { "prompt": "turn this into a 3d model: a wooden chair", "workflow_type": "3d_simple" } } → Generates a reference image (via general), then runs 3d_simple.json on it. Returns both URLs.

How it works Classification – scans your prompt for keywords (girl, building, 3d, etc.) to pick the right workflow & resolution.

Prompt injection – finds CLIPTextEncode nodes and fills the positive prompt (the user prompt) and the negative prompt (built‑in presets).

Random seeding – randomises KSampler seeds for unique results every time.

Queue & Poll – sends the workflow to ComfyUI via /prompt and polls /history until the result is ready.

Output – returns the full URL to view/download the generated file.

Error handling If ComfyUI is not running – returns ERROR

On failure – retries up to 2 times automatically.

Detailed logs are printed to the console.