Install Plainfold data tools (all tools) 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": {
    "plainfold-mcp": {
      "url": "https://mcp.apify.com/?tools=plainfold/sam-gov-contract-opportunities,plainfold/business-entity-check,plainfold/company-hiring-signals,plainfold/sec-company-financials"
    }
  }
}

3. Save the file and restart LM Studio.

Check it worked

Ask LM Studio: List the tools of plainfold-mcp.

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.