how do i stop a animation when im not holding a tool?

What I do when i encounter this problem, is create a separate animation and i name it "security", which basically stops all animations.

Tutorial

First, load in your animation editor onto a rig... thing

Then, you basically disable all of the parts ( Can be done by clicking every single box to the left of your editor )

So finally, you just add that animation onto your tool (or whatever)

Final code:

script.Parent.Equipped:Connect(function()
        game.Players.LocalPlayer.Character.Humanoid.WalkSpeed = 0
        animation = game.Players.LocalPlayer.Character.Humanoid:LoadAnimation(script.Parent.Hold)
        animation:Play()
end)

script.Parent.Unequipped:Connect(function()
        game.Players.LocalPlayer.Character.Humanoid.WalkSpeed = 16
        animation =game.Players.LocalPlayer.Character.Humanoid:LoadAnimation(script.Parent.Hold)
        animation:Stop()
    ----ADDED CODE
    SecurityAn = (Ur animation)
    SecurityAn:Play
    wait(0.5)
    SecurityAn:Stop()
end)

Hope this was clear :)

Simple solution! Just use the unequipped function like for example:

Script.Parent.Unequipped:Connect(function()

So your solution is:

Script.Parent.Unequipped:Connect(function() -- Does a function on tool unequipped.
animation:Stop() -- Stops the animation.

Make sure you put that under all that line of code! It should work. If you want to make it do anything else on unequipped, then just simply put what you want to do under the unequipped event like this:

Script.Parent.Unequipped:Connect(function()
-- Put whatever you want to make the tool do on unequipped here.