Connect your agent

Set up Claude Desktop

Add one entry to the config file, then restart.

1
Open the config file
In Claude Desktop, open Settings › Developer › Edit Config. This opens claude_desktop_config.json in ~/Library/Application Support/Claude/.

Add ScreenTap

Paste this in. If the file already has an mcpServers section, add only the "screentap" entry inside it.

claude_desktop_config.json

{
  "mcpServers": {
    "screentap": {
      "command": "/Applications/ScreenTap.app/Contents/MacOS/ScreenTap",
      "args": ["--stdio"]
    }
  }
}

3
Restart Claude Desktop
Quit it completely with ⌘Q (closing the window isn't enough), then open it again.
4
Check it's connected
Open the tools menu in a new chat. ScreenTap and its tools should be listed. Then try:
Prompt
```
Take a screenshot of my iPhone and tell me what's on screen.
```

Good to know

Claude Desktop only starts local programs, so it talks to ScreenTap through the app's stdio mode. Keep the ScreenTap app open too.
If you keep ScreenTap somewhere other than Applications, change the path in "command" to match.

Check that the ScreenTap app is open and your iPhone is connected, then restart your agent or start a new session. More fixes in Troubleshooting.