Connect 3V3 to Windsurf, now Devin Desktop

Steps

1. In the agent panel open the … (Actions) menu at the top right, then MCPs, and open the MCP config from there. (The two Devin pages above name different paths for the file, so let the panel open the right one.) Add:

   {
     "mcpServers": {
       "v3": { "serverUrl": "https://mcp.3v3.dev" }
     }
   }

2. Devin Desktop supports OAuth on every transport: sign in to 3V3 in the browser and press Allow.

   

3. Refresh the MCPs panel; 3V3's tools are listed.

When it works

Your app lists 3V3's 74 tools — create_project, import_kicad_board, list_projects, list_groups, create_group, rename_group, move_board_to_group, get_routing_log and the rest — and your boards are on app.3v3.dev, where you can watch them change and take over at any time. The Connect page lists the app under Connected apps, where Disconnect stops it at once.

A first ask

Make a 50 × 50 mm board with an ESP32-C3, USB-C power and a status LED. Route it and stop when the check is clean.

With a key instead

For a setup that can't sign in. Make a key on app.3v3.dev/connect (shown once).

Devin's page shows headers on a remote server:

{
  "mcpServers": {
    "v3": {
      "serverUrl": "https://mcp.3v3.dev",
      "headers": { "Authorization": "Bearer 3v3_dev_…" }
    }
  }
}

If it stops

What 3V3 says, word for word, and what to do.