UserInputService only when holding a Tool?

So i have been trying this for a long time and still can't do it.How do i make it so that when the player is holding a tool THEN they can use UIS (UserInputService).Most of the time i can use the UIS without holding the tool and that is not what i am trying to get.

wait(3)
local UIS = game:GetService("UserInputService")
local Player = game.Players.LocalPlayer 
local Holding = false

if script.Parent.Equipped == true then
	Holding = true
elseif script.Parent.Equipped == false then
	Holding = false
end

	UIS.InputBegan:Connect(function(key)
		if key.KeyCode == Enum.KeyCode.R and Holding == true then
			print("Key")
			 local BV = Instance.new("BodyVelocity", Player.Character.HumanoidRootPart)
		BV.maxForce = Vector3.new(0, math.huge, 0)
		BV.Velocity = Vector3.new(0, 60, 0)
		wait(0.5)
		BV:Destroy()
		end
	end)

Hello. Your variable Holding will be defined once and it will not change if you equip/unequip the tool. There are 2 events that will help you: Equipped and Unequipped. Here's an example:

local UserInputService = game:GetService("UserInputService")
local Holding = false

UserInputService.InputBegan:Connect(function(input, box)
	if input.KeyCode == Enum.KeyCode.R and not box and Holding then
		print("Key R pressed, tool equipped.!")
	end
end)

script.Parent.Equipped:Connect(function()
	Holding = true
end)

script.Parent.Unequipped:Connect(function()
	Holding = false
end)

Note: box is a boolean value. If the user was focused on a TextBox, for example, the Chat, when he was pressing the key, it will be true, if not, false.