how to make it so that when you hold an item, it disappears from your inventory?

sorry about it but i dont know how made it for _, tool in pairs(backpack:GetChildren()) do for _,tool in pairs(Inventory:GetChildren()) do if tool.Name == "Sword" then tool:Destroy() end

Try this

local player = game.Players.LocalPlayer

for i,v in pairs(player.Backpack:GetChildren()) do
	if v.Name == "Sword" then
		v:Destroy()
	end
end

for i,v in pairs(player.Character:GetChildren()) do
	if v.Name == "Sword" then
		v:Destroy()
	end
end

make sure the script is a local script or else this will not work.

local player = game.Players.LocalPlayer -- sets a variable for the client (which is invisible to the server that's why it must be local script.

for _,v in pairs(player.Backpack:GetChildren()) do -- Gets every value (things) in the backpack
	if v.Name = "Sword" and v:IsA("Tool") then -- checks if the value's name is called Sword and makes sure it is a tool
	local sword = v -- sets a variable for the Sword
	sword.Equipped:Connect(function() -- does the following if the sword is equipped
		sword:Destroy() -- Deletus le sword
	end)
end