remote_macos_mouse_drag_n_drop

Instructions

Implementation Reference

• src/action_handlers.py:559-658 (handler)

  The core handler function that executes the tool logic: connects via VNC, scales source coordinates to target screen dimensions, simulates smooth drag-and-drop by pressing mouse button at start, moving in steps, and releasing at end.

  def handle_remote_macos_mouse_drag_n_drop(arguments: dict[str, Any]) -> list[types.TextContent | types.ImageContent | types.EmbeddedResource]:
      """Perform a mouse drag operation 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
      start_x = arguments.get("start_x")
      start_y = arguments.get("start_y")
      end_x = arguments.get("end_x")
      end_y = arguments.get("end_y")
      source_width = int(arguments.get("source_width", 1366))
      source_height = int(arguments.get("source_height", 768))
      button = int(arguments.get("button", 1))
      steps = int(arguments.get("steps", 10))
      delay_ms = int(arguments.get("delay_ms", 10))
  
      # Validate required parameters
      if any(x is None for x in [start_x, start_y, end_x, end_y]):
          raise ValueError("start_x, start_y, end_x, and end_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_start_x = int((start_x / source_width) * target_width)
          scaled_start_y = int((start_y / source_height) * target_height)
          scaled_end_x = int((end_x / source_width) * target_width)
          scaled_end_y = int((end_y / source_height) * target_height)
  
          # Ensure coordinates are within the screen bounds
          scaled_start_x = max(0, min(scaled_start_x, target_width - 1))
          scaled_start_y = max(0, min(scaled_start_y, target_height - 1))
          scaled_end_x = max(0, min(scaled_end_x, target_width - 1))
          scaled_end_y = max(0, min(scaled_end_y, target_height - 1))
  
          # Calculate step sizes
          dx = (scaled_end_x - scaled_start_x) / steps
          dy = (scaled_end_y - scaled_start_y) / steps
  
          # Move to start position
          if not vnc.send_pointer_event(scaled_start_x, scaled_start_y, 0):
              return [types.TextContent(type="text", text="Failed to move to start position")]
  
          # Press button
          button_mask = 1 << (button - 1)
          if not vnc.send_pointer_event(scaled_start_x, scaled_start_y, button_mask):
              return [types.TextContent(type="text", text="Failed to press mouse button")]
  
          # Perform drag
          for step in range(1, steps + 1):
              current_x = int(scaled_start_x + dx * step)
              current_y = int(scaled_start_y + dy * step)
              if not vnc.send_pointer_event(current_x, current_y, button_mask):
                  return [types.TextContent(type="text", text=f"Failed during drag at step {step}")]
              time.sleep(delay_ms / 1000.0)  # Convert ms to seconds
  
          # Release button at final position
          if not vnc.send_pointer_event(scaled_end_x, scaled_end_y, 0):
              return [types.TextContent(type="text", text="Failed to release mouse button")]
  
          # 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 drag (button {button}) completed:
  From source ({start_x}, {start_y}) to ({end_x}, {end_y})
  From target ({scaled_start_x}, {scaled_start_y}) to ({scaled_end_x}, {scaled_end_y})
  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
  Steps: {steps}
  Delay: {delay_ms}ms"""
          )]
  
      finally:
          # Close VNC connection
          vnc.close()

• src/mcp_remote_macos_use/server.py:283-284 (registration)

  Tool dispatch/registration in the MCP server's call_tool handler, mapping the tool name to the action handler function.

  elif name == "remote_macos_mouse_drag_n_drop":
      return handle_remote_macos_mouse_drag_n_drop(arguments)

• src/mcp_remote_macos_use/server.py:235-249 (schema)

  JSON schema defining the input parameters for the tool, including required start/end coordinates and optional scaling, button, steps, and delay parameters.

  inputSchema={
      "type": "object",
      "properties": {
          "start_x": {"type": "integer", "description": "Starting X coordinate (in source dimensions)"},
          "start_y": {"type": "integer", "description": "Starting Y coordinate (in source dimensions)"},
          "end_x": {"type": "integer", "description": "Ending X coordinate (in source dimensions)"},
          "end_y": {"type": "integer", "description": "Ending Y coordinate (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},
          "button": {"type": "integer", "description": "Mouse button (1=left, 2=middle, 3=right)", "default": 1},
          "steps": {"type": "integer", "description": "Number of intermediate points for smooth dragging", "default": 10},
          "delay_ms": {"type": "integer", "description": "Delay between steps in milliseconds", "default": 10}
      },
      "required": ["start_x", "start_y", "end_x", "end_y"]
  },

• src/mcp_remote_macos_use/server.py:232-250 (registration)

  MCP Tool registration in list_tools(), defining name, description, and input schema for the remote_macos_mouse_drag_n_drop tool.

  types.Tool(
      name="remote_macos_mouse_drag_n_drop",
      description="Perform a mouse drag operation from start point and drop to end point on a remote MacOs machine, with automatic coordinate scaling.",
      inputSchema={
          "type": "object",
          "properties": {
              "start_x": {"type": "integer", "description": "Starting X coordinate (in source dimensions)"},
              "start_y": {"type": "integer", "description": "Starting Y coordinate (in source dimensions)"},
              "end_x": {"type": "integer", "description": "Ending X coordinate (in source dimensions)"},
              "end_y": {"type": "integer", "description": "Ending Y coordinate (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},
              "button": {"type": "integer", "description": "Mouse button (1=left, 2=middle, 3=right)", "default": 1},
              "steps": {"type": "integer", "description": "Number of intermediate points for smooth dragging", "default": 10},
              "delay_ms": {"type": "integer", "description": "Delay between steps in milliseconds", "default": 10}
          },
          "required": ["start_x", "start_y", "end_x", "end_y"]
      },
  ),

• src/mcp_remote_macos_use/server.py:41-41 (registration)

  Import of the handler function from action_handlers.py into the server module.

  handle_remote_macos_mouse_drag_n_drop