How can you make a Backpack Tool Limit?

I tried to make a Backpack limit so people can have a weapon limit in my rpg game, and I can not figure it out, could somebody help or type in the code?

Here is a example code, but this free model did not work

limit = 8 -- amount of items a player can carry


game.Players.PlayerAdded:Connect(function(p)
	wait(1)
    p.Character.ChildAdded:Connect(function(tool)
        local items = p.Backpack:GetChildren()
		local charitems = p.Character:FindFirstChildWhichIsA("Tool")
        if #items >= limit then
			wait(.5)
            tool.Parent = workspace
        end
    end)
end)

(EDIT) It sends it into the players Backpack When somebody buys a weapon from my shop gui it clones and sends it to the backpack, but even with this script, it still goes through.