Install Cua-S1-4B GUI Decision Model in LM Studio

What you need first

• LM Studio, installed.
• Nothing else: the server runs on its publisher's machines and LM Studio connects to it.

Steps

1. In LM Studio, open the Program tab and choose Install › Edit mcp.json.
2. Add this block. If the file already has mcpServers, add only the entry inside it.

{
  "mcpServers": {
    "cua-s1-4b-02-demo": {
      "url": "https://cua-ai-cua-s1-4b-02-demo.hf.space/gradio_api/mcp/sse"
    }
  }
}

3. Save the file and restart LM Studio.

Check it worked

Ask LM Studio: List the tools of cua-s1-4b-02-demo. It should list 1 tool.

If it does not start

401 Unauthorized

The endpoint wants a sign-in or a key. Sign in when LM Studio asks.

Nothing changes after a restart

The file is not valid JSON any more. Look for a missing comma where the block was added.