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gNucleus/text-to-cad-mcp: gNucleus Text To CAD MCP server

gNucleus Text To CAD MCP server

gNucleus is a Generative AI platform that transforms text and images into editable CAD models.

This repository contains the gNucleus Text-To-CAD MCP server, which connects to the gNucleus API. It allows MCP clients to generate CAD parts or assemblies from text input using gNucleus’s GenAI models.

Python 3.7+
gNucleus Developer Accounts with:
- gNucleus API key

Clone this repository

Create and activate a virtual environment (recommended):

python -m venv .venv
source .venv/bin/activate  # On Windows: .venv\Scripts\activate

Install dependencies:
```
pip install -r requirements.txt
```

Create a .env file in the root directory with the following variables:

Invidisual User

GNUCLEUS_HOST="genai.gnucleus.ai"
GNUCLEUS_API_KEY=<your-personal-api-key>

Enterprise User

GNUCLEUS_HOST="genai.gnucleus.ai"
GNUCLEUS_API_KEY=<your-team-key>
GNUCLEUS_ORG_ID=<your-team-id>

Obtaining gNucleus API KEY

gNucleus Account: sign-up on https://gnucleus.ai/
API KEY: Create a personal access token in gNucleus:
- Go to User Profile (click your user icon in the top right)
- Go to "Account"
- Click "Generate New API Key" to generate a new API KEY
- Each account start with 200 free API credit

Start the MCP server:

You can test the MCP server using the inspector by running

npx @modelcontextprotocol/inspector python3 main.py

The following MCP tools are available:

text_to_cad(input: str) - Generate CAD from input

When used with LLMs that support the MCP protocol, this server enables natural language interaction with gNucleus:

"draw a block in CAD"
"draw a block with length=80mm, width=40mm, height=20mm in CAD"
"draw a spur gear shaft in CAD"
"draw a spur gear shaft with number_teeth=20 in CAD"
"draw an elbow flange in CAD"
"draw an elbow flange with number_bolt_holes=4 in CAD"

i18n support: You can use any language as the prompt, in general english works better than other languages, but it should work in general.

Chinese: "在CAD中绘制一个大小为10mm的方块"
Spanish: "Dibuja un bloque cuadrado de 10 mm en CAD"

"generate a tapered roller bearing using text-to-cad tool"
"draw a differential gear box in CAD"

The generated result include the design spec with Key Parameter, Description and a shared URL with 3D display viewer. The shared URL will be expired in 24 hrs.

1. Add or update the Claude Desktop configuration file(claude_desktop_config.json): virtual python environment

If you use virtual python enviroment, use this config:

{
  "mcpServers": {
    "gnucleus": {
      "command": "/ABSOLUTE/PATH/TO/YOUR/text-to-cad-mcp/.venv/bin/python",
      "args": [
        "/ABSOLUTE/PATH/TO/YOUR/text-to-cad-mcp/main.py"
      ],
      "workingDirectory": "/ABSOLUTE/PATH/TO/YOUR/text-to-cad-mcp",
      "env": {
        "GNUCLEUS_HOST": "genai.gnucleus.ai",
        "GNUCLEUS_API_KEY": "YOUR_API_KEY_HERE",
      }
    }
  }
}

global python environment

If you use global python enviroment and also installed the requirments.txt into your global python enviroment, use this config

{
  "mcpServers": {
    "gnucleus": {
      "command": "python",
      "args": [
        "/ABSOLUTE/PATH/TO/YOUR/text-to-cad-mcp/main.py"
      ],
      "workingDirectory": "/ABSOLUTE/PATH/TO/YOUR/text-to-cad-mcp",
      "env": {
        "GNUCLEUS_HOST": "genai.gnucleus.ai",
        "GNUCLEUS_API_KEY": "YOUR_API_KEY_HERE",
      }
    }
  }
}

2. Save the file and restart Claude Desktop

You should see the gNucleus Text-To-CAD tools in Claude

3. Chat with Claude to generate the CAD model

Chat with Claude and add "in CAD" in each prompt or tell Claude to use "text-to-cad tools"can help Claude to trigger the Text-To-CAD tool better.

The generated result include the design spec with Key Parameter, Description and a shared link with 3D display viewer. The shared URL will be expired in 24 hrs. If Claude didn't output the shared URL in the chat message, you can ask Claude to always output the shared URL.

Click the shared URL, it will display the CAD model in gNucleus 3D viewer, you can

Rotate by holding the left mouse button
Pan by holding the right mouse button
Zoom using the middle mouse button

Example 1: Text To CAD Part

Input and CAD Part design spec
CAD Part in 3D viewer

Example 2: Text To CAD Assembly

Input and CAD Assembly design spec
CAD Assembly in 3D viewer

Note: Downloading CAD models from the viewer is not yet supported. To download the model, please log in to https://gnucleus.ai and try the same prompt using the full feature set.

If the CAD model looks incorrect or only partially generated, try logging in at https://gnucleus.ai, enter the same prompt, and download the CAD file (e.g., FreeCAD format). Then open it in your CAD software(e.g. FreeCAD ). This issue is often caused by incomplete generation of CAD features within the part.

You can also report a bug or contact us with the model link and prompt at https://gnucleus.ai/contact.

Secure your .env file and never commit it to github
Run this server in a secure environment

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