How can I tell the function to only work if no tool is selected?

I have a script and I only want it to work if the player has no tools selected. How could I define no tools being selected? I tried the player's Backpack.Selected and Bin.Selected but neither of those worked. Basically what I'm asking is, how can I say in Lua "when the player has no tool selected"? Thanks for any help guys and let me know if I need to clarify anything!

I don't know of any built in API to do such a thing, but it is quite easy to make a function that checks for this.

When a tool is equipped, it is transferred from the Player's backpack into the Player's Character. Knowing this, we can loop through the children of the character in order to determine if a tool is equipped:

function isToolEquipped(player)
	local character = player.Character
	if character then
		for _, child in next, character:GetChildren() do
			if child:IsA("Tool") then
				return true
			end
		end
	end
	return false -- If it hasn't returned yet, no tool is equipped
end

So in your case, you could use this in an if statement like:

if not isToolEquipped(player) then

Assuming 'player' is defined

###EDIT: Hopperbin Version

function isToolEquipped(player)
	local character = player.Character
	if character then
		for _, child in next, character:GetChildren() do
			if child:IsA("Tool") then
				return true
			end
		end
	end

	for _, child in next, player.Backpack:GetChildren() do
		if child:IsA("HopperBin") and child.Active then
			return true
		end
	end

	return false -- If it hasn't returned yet, no tool is equipped
end