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1

Open Developer settings

Open Claude Desktop → Settings → Developer.
2

Edit config

Click Edit Config. Find claude_desktop_config.json and open it with Notepad or any text editor.
3

Add the server

You will see something like this:
{
  "preferences": {
    "coworkScheduledTasksEnabled": true,
    "sidebarMode": "task"
  }
}
Add a comma after the preferences closing brace, then paste the mcpServers block:
{
  "preferences": {
    "coworkScheduledTasksEnabled": true,
    "sidebarMode": "task"
  },
  "mcpServers": {
    "openfinance-tech": {
      "type": "http",
      "url": "https://api.openfinance.tech/agent/mcp",
      "headers": {
        "x-api-key": "open_xxxxx"
      }
    }
  }
}
If you only need public tools, drop the headers object entirely.
4

Close Claude fully

Right-click Claude Desktop in the taskbar → Close window, or press Alt+F4.
5

Reopen and verify

Reopen Claude Desktop. Start a new conversation, you should see a hammer icon in the chat input area.
Make sure the app is fully closed, not just minimized.