Use with Claude Desktop - UniversalBench

Setup

Get your personal MCP URL

Open the config file

On macOS: ~/Library/Application Support/Claude/claude_desktop_config.jsonOn Windows: %APPDATA%\Claude\claude_desktop_config.jsonCreate the file if it does not exist.

Add UniversalBench

{
  "mcpServers": {
    "universalbench": {
      "url": "https://universalbench-mcp.penantiaglobal.workers.dev/u/ubk_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
    }
  }
}

That is the entire config. One URL, no headers field. Claude Desktop reads the URL on startup and the tools appear.

Restart Claude Desktop

Quit fully (not just close the window) and reopen. UniversalBench appears in the conversation tool list.

What you can do now

Claude Desktop is great for ad hoc analysis. Try:

Use UniversalBench to search the web for the largest pension fund returns in 2026, pull the numbers, and analyze the top 10.

Claude Desktop calls web_search for current data, runs Python to parse and analyze, and returns clean analysis.

Or:

Store my Stripe API key in UniversalBench’s secrets vault under the name STRIPE_KEY. From now on, whenever I ask you to do anything with payments, inject it by name.

Claude uses secrets_vault to store the value encrypted. On every subsequent payment task, it injects the secret by name without pasting the value into the conversation.

Troubleshooting

Problem	Fix
Tools do not appear	Open `Developer` then `MCP Logs` in Claude Desktop and read the connection error
Config file path wrong	The path is OS specific. See Step 2 above
401 or 403 errors	Re copy the URL from your dashboard. One wrong character in the token breaks auth
URL stopped working after rotation	Update the config with the new URL from your dashboard

​Setup

​What you can do now

​Tips

​Troubleshooting

Setup

What you can do now

Tips

Troubleshooting