Check For Tool Script

local ToolName = "TestTool"

game.Players.PlayerAdded:Connect(function(Player)
    Player.CharacterAdded:Connect(function(Character)
        if Player.Backpack:FindFirstChild(ToolName) then
            print("Player has tool in backpack!")
        else
            print("Player does not have tool in backpack!")
        end
    end)

end)