MCP Remote macOS Control Server

Instructions

Implementation Reference

• src/action_handlers.py:421-483 (handler)

  The core handler function that implements the remote_macos_mouse_move tool logic: connects via VNC, scales input coordinates to target screen resolution, moves the mouse pointer using send_pointer_event, and returns success status with scaling details.

  def handle_remote_macos_mouse_move(arguments: dict[str, Any]) -> list[types.TextContent | types.ImageContent | types.EmbeddedResource]:
      """Move the mouse cursor on a remote MacOs machine."""
      # Use environment variables
      host = MACOS_HOST
      port = MACOS_PORT
      password = MACOS_PASSWORD
      username = MACOS_USERNAME
      encryption = VNC_ENCRYPTION
  
      # Get required parameters from arguments
      x = arguments.get("x")
      y = arguments.get("y")
      source_width = int(arguments.get("source_width", 1366))
      source_height = int(arguments.get("source_height", 768))
  
      if x is None or y is None:
          raise ValueError("x and y coordinates are required")
  
      # Ensure source dimensions are positive
      if source_width <= 0 or source_height <= 0:
          raise ValueError("Source dimensions must be positive values")
  
      # Initialize VNC client
      vnc = VNCClient(host=host, port=port, password=password, username=username, encryption=encryption)
  
      # Connect to remote MacOs machine
      success, error_message = vnc.connect()
      if not success:
          error_msg = f"Failed to connect to remote MacOs machine at {host}:{port}. {error_message}"
          return [types.TextContent(type="text", text=error_msg)]
  
      try:
          # Get target screen dimensions
          target_width = vnc.width
          target_height = vnc.height
  
          # Scale coordinates
          scaled_x = int((x / source_width) * target_width)
          scaled_y = int((y / source_height) * target_height)
  
          # Ensure coordinates are within the screen bounds
          scaled_x = max(0, min(scaled_x, target_width - 1))
          scaled_y = max(0, min(scaled_y, target_height - 1))
  
          # Move mouse pointer (button_mask=0 means no buttons are pressed)
          result = vnc.send_pointer_event(scaled_x, scaled_y, 0)
  
          # Prepare the response with useful details
          scale_factors = {
              "x": target_width / source_width,
              "y": target_height / source_height
          }
  
          return [types.TextContent(
              type="text",
              text=f"""Mouse move from source ({x}, {y}) to target ({scaled_x}, {scaled_y}) {'succeeded' if result else 'failed'}
  Source dimensions: {source_width}x{source_height}
  Target dimensions: {target_width}x{target_height}
  Scale factors: {scale_factors['x']:.4f}x, {scale_factors['y']:.4f}y"""
          )]
      finally:
          # Close VNC connection
          vnc.close()

• src/mcp_remote_macos_use/server.py:175-187 (registration)

  Tool registration in the MCP server's list_tools() method, defining the tool name, description, and input schema for coordinate scaling.

      name="remote_macos_mouse_move",
      description="Move the mouse cursor to specified coordinates on a remote MacOs machine, with automatic coordinate scaling. Uses environment variables for connection details.",
      inputSchema={
          "type": "object",
          "properties": {
              "x": {"type": "integer", "description": "X coordinate for mouse position (in source dimensions)"},
              "y": {"type": "integer", "description": "Y coordinate for mouse position (in source dimensions)"},
              "source_width": {"type": "integer", "description": "Width of the reference screen for coordinate scaling", "default": 1366},
              "source_height": {"type": "integer", "description": "Height of the reference screen for coordinate scaling", "default": 768}
          },
          "required": ["x", "y"]
      },
  ),

• src/mcp_remote_macos_use/server.py:177-187 (schema)

  Input schema definition validating x, y coordinates (required) and optional source_width, source_height for scaling.

      inputSchema={
          "type": "object",
          "properties": {
              "x": {"type": "integer", "description": "X coordinate for mouse position (in source dimensions)"},
              "y": {"type": "integer", "description": "Y coordinate for mouse position (in source dimensions)"},
              "source_width": {"type": "integer", "description": "Width of the reference screen for coordinate scaling", "default": 1366},
              "source_height": {"type": "integer", "description": "Height of the reference screen for coordinate scaling", "default": 768}
          },
          "required": ["x", "y"]
      },
  ),

• src/mcp_remote_macos_use/server.py:271-272 (handler)

  Dispatch logic in the server's call_tool handler that routes requests for remote_macos_mouse_move to the imported handler function.

  elif name == "remote_macos_mouse_move":
      return handle_remote_macos_mouse_move(arguments)