Fixing the NonicaTab AI Connector for Claude Desktop and Revit

Why this happens: the Microsoft Store version of Claude Desktop reads its config from a different path than the standard install. NonicaTab's auto-setup writes to the wrong location, so Claude Desktop never sees the Revit MCP server. This guide shows you how to fix it in 6 steps.

Install Prerequisites

Make sure both are installed before proceeding:

• NonicaTab (Free or PRO) — download from the Autodesk App Store.
• Claude Desktop App — download from claude.com/download.

Launch in the Correct Order

Always open Claude Desktop last — the AI Connector must be running first:

• Open Revit.
• Run AI Connector from the NonicaTab toolbar — keep it open.
• Confirm it shows "Claude Desktop App is ready".
• Open Claude Desktop last.

Find the Correct Config File Location

The Microsoft Store version uses a sandboxed path. To find it: open Claude Desktop → Settings → Developer → click Edit Config. The path will look like:

C:\Users\{your-username}\AppData\Local\Packages\Claude_pzs8sxrjxfjjc\LocalCache\Roaming\Claude\claude_desktop_config.json

Important: do not edit the file at AppData\Roaming\Claude — the Store version ignores it completely. Always use the path shown in the Edit Config button.

Edit the Config File

Open the file with Notepad. Replace the entire contents with the following (preserve your existing preferences values and add the mcpServers block below them):

{
  "preferences": {
    "menuBarEnabled": false,
    "legacyQuickEntryEnabled": false,
    "coworkScheduledTasksEnabled": false,
    "sidebarMode": "chat",
    "coworkWebSearchEnabled": true,
    "ccdScheduledTasksEnabled": false
  },
  "mcpServers": {
    "Revit": {
      "type": "stdio",
      "command": "C:\\NONICA\\OtherFiles\\System\\Core\\net8.0-windows\\RevitMCPConnection.exe",
      "args": [],
      "timeout": 15000
    }
  }
}

Note: your preferences block may look slightly different — that is fine. Keep your own values and only add the mcpServers block below it.

Save and Fully Restart Claude Desktop

Closing the window is not enough — you must quit from the system tray:

• Save the config file in Notepad (Ctrl+S).
• Find the Claude icon in the system tray (bottom-right corner, near the clock).
• Right-click the icon → Quit Claude.
• Reopen Claude Desktop from the Start menu.

Verify the Connection

In Claude Desktop, open a new chat. Look for the tools/hammer icon near the message input — you should see Revit tools listed. Test it with a prompt like: