How to whitelist a tool to a certain Player?

You can just clone it to their StarterGear if they are whitelisted.

-- dictionary with names lowercased
local WhiteList = {['azarth'] = true, ['you'] = true}
-- location of tool
local Tool = script:WaitForChild("Tool")

local function PlayerJoined(Player)
    -- if whitelisted
    if WhiteList[Player.Name:lower()] then
    -- clone tool to StarterGear 
        Tool:Clone().Parent = Player:WaitForChild('StarterGear')
    end
end

-- On join
game.Players.PlayerAdded:Connect(PlayerJoined)

-- Players not caught by event
for i,v in pairs ( game.Players:GetPlayers()) do 
    PlayerJoined(v)
end

i have a pretty simple script but it works. what this script does is, when a player picks up a tool they by default equip the tool. so when the player equips the tool it checks if the players name is in a whitelist table or not if it is then it prints "whitelisted" elseif they are not in the whitelist table it destroys itself.

local whitelist = {"YourUser", "FriendsUser"} --add the whitelist users here

script.Parent.Equipped:Connect(function()
    local char = script.Parent
    if char.Name == whitelist then
        print("whitelisted")
    elseif char.Name ~= whitelist then
        script.Parent:Destroy()
    end
end)

just place this in a serverscript inside of your tool. hope this helped you :)

First, we need to see if the player is not “Theisnotmyrealuser”

game.Players.PlayerAdded:connect(function(plr)
if not plr.name == "Thatisnotmyrealuser" then

end
end)

Now, we need to detect if the player has the tool

game.Players.PlayerAdded:connect(function(plr)
if not plr.name == "Thatisnotmyrealuser" then
local children = plr.Backpack:GetChildren()
for i = 1, #children do
    local child = children[i]
    if child.Name == Tool then

end
end
end)

Now, we need to remove it.

game.Players.PlayerAdded:connect(function(plr)
if not plr.name == "Thatisnotmyrealuser" then
local children = plr.Backpack:GetChildren()
for i = 1, #children do
    local child = children[i]
    if child.Name == Tool then
plr.Backpack:FindFirstChild("Tool"):Destroy()
end
end
end)