New ToolScript with Stacks (QuantityText)

local Tool = script.Parent

local player = game.Players.LocalPlayer
local QuantityText = player.PlayerGui:WaitForChild("BackpackGui").Frame.quantityLabel

Tool:WaitForChild("stacks").Changed:Connect(function(value)
    QuantityText.Text = "Quantity: "..value
end)

QuantityText.Text = "Quantity: "..Tool.stacks.Value

Tool.Activated:Connect(function()
    if Tool:WaitForChild("stacks") and Tool.stacks.Value > 1 then
        Tool.stacks.Value -= 1
        player.Character.Humanoid.Health += 5
    else
        Tool:Destroy()
        QuantityText.Visible = false
    end
end)

Tool.Equipped:Connect(function()
    QuantityText.Visible = true
end)

Tool.Unequipped:Connect(function()
    QuantityText.Visible = false
end)