Swift MCP GUI Server

Swift MCP GUI Server

A Model Context Protocol (MCP) server that allows controlling macOS through SwiftAutoGUI. This server provides tools for programmatically controlling the mouse and keyboard through MCP clients.

Requirements

• macOS 27.0 or later (required by SwiftAutoGUI 1.0.0)
• Swift 6.2 or later
• Xcode 27.0 or later

Installation

Homebrew (recommended)

Install via the NakaokaRei/tap:

brew install NakaokaRei/tap/swift-mcp-gui

Then point your MCP client at the installed binary:

{
  "mcpServers": {
    "swift-mcp-gui": {
      "command": "/opt/homebrew/bin/swift-mcp-gui"
    }
  }
}

On Intel Macs the path is /usr/local/bin/swift-mcp-gui. To upgrade later, run brew upgrade swift-mcp-gui.

From source

1. Clone this repository:

git clone https://github.com/NakaokaRei/swift-mcp-gui.git
cd swift-mcp-gui

2. Install

swift package experimental-install

3. Add command to your MCP client.

{
  "mcpServers" : {
    "swift-mcp-gui" : {
      "command" : "/Users/USERNAME/.swiftpm/bin/swift-mcp-gui"
    }
  }
}

Available Tools

The server provides the following tools for controlling macOS:

1. Mouse Movement

• Tool name: moveMouse
• Input:
  • x: number (x-coordinate) - accepts integers, doubles, or string representations
  • y: number (y-coordinate) - accepts integers, doubles, or string representations
• Moves the mouse cursor to the specified coordinates

2. Mouse Clicks

• Tool name: mouseClick
• Input:
  • button: string ("left" or "right")
• Performs a mouse click at the current cursor position

3. Keyboard Input

• Tool name: sendKeys
• Input:
  • keys: array of strings (key names)
• Sends keyboard shortcuts or key combinations
• Example keys: "command", "control", "option", "shift", "return", "space", "a", "1", etc.

4. Scrolling

• Tool name: scroll
• Input:
  • direction: string ("up", "down", "left", "right")
  • clicks: number (number of scroll clicks)
• Performs scrolling in the specified direction

5. Screen Size

• Tool name: getScreenSize
• Returns the main screen dimensions (width and height)

6. Pixel Color

• Tool name: getPixelColor
• Input:
  • x: number (x-coordinate) - accepts integers, doubles, or string representations
  • y: number (y-coordinate) - accepts integers, doubles, or string representations
• Returns the RGBA color values (0-255) of the pixel at the specified coordinates

7. Capture Screen

• Tool name: captureScreen
• Input:
  • quality: number (optional, 0.0-1.0, default: 0.5) - JPEG compression quality
  • scale: number (optional, 0.1-1.0, default: 0.25) - Scale factor for image size
  • output: string (optional, "path" or "image", default: "path") - Output format
• output: "path" (default): Saves to a temporary file and returns the file path with dimensions. Reduces token consumption.
• output: "image": Returns inline image content for AI vision (e.g. Claude)

8. Capture Region

• Tool name: captureRegion
• Input:
  • x: number (x-coordinate of the region)
  • y: number (y-coordinate of the region)
  • width: number (width of the region)
  • height: number (height of the region)
  • quality: number (optional, 0.0-1.0, default: 0.5) - JPEG compression quality
  • scale: number (optional, 0.1-1.0, default: 0.25) - Scale factor for image size
  • output: string (optional, "path" or "image", default: "path") - Output format
• output: "path" (default): Saves to a temporary file and returns the file path with dimensions. Reduces token consumption.
• output: "image": Returns inline image content for AI vision (e.g. Claude)

9. Save Screenshot

• Tool name: saveScreenshot
• Input:
  • filename: string (path to save the screenshot)
  • x: number (optional, x-coordinate of the region)
  • y: number (optional, y-coordinate of the region)
  • width: number (optional, width of the region)
  • height: number (optional, height of the region)
  • quality: number (optional, 0.0-1.0, default: 0.1) - JPEG compression quality
  • scale: number (optional, 0.1-1.0, default: 0.25) - Scale factor for image size
• Captures the screen or a region and saves it to a file
• File format is determined by the filename extension (.jpg, .jpeg, .png)
• Quality parameter only affects JPEG files

10. Execute AppleScript

• Tool name: executeAppleScript
• Input:
  • script: string (AppleScript code to execute)
• Executes AppleScript code directly and returns the result
• Returns "AppleScript Result: " if the script returns a value
• Returns "AppleScript executed successfully (no result returned)" if the script completes without returning a value

11. Execute AppleScript File

• Tool name: executeAppleScriptFile
• Input:
  • path: string (path to the AppleScript file)
• Executes an AppleScript from a file and returns the result
• Returns "AppleScript Result: " if the script returns a value
• Returns "AppleScript file executed successfully (no result returned): " if the script completes without returning a value

Security Considerations

This server requires full accessibility permissions in System Preferences to control your mouse and keyboard. Be careful when running it and only connect trusted MCP clients.

License

MIT License