Why do my animations not play when I run my game from the Roblox website?

I've seemingly tried everything, but my custom animations simply won't play in the Roblox client. They work fine in the studio, and I do not get any errors when I run it, but my animations just don't play.

local Tool = script.Parent.Parent.Parent
local animController = script.Parent.AnimationController
local animator = animController:WaitForChild("Animator")
local Anim = Instance.new("Animation")
Anim.AnimationId = "rbxassetid://4909182058"
local idle = Instance.new("Animation")
idle.AnimationId = "rbxassetid://4909225193"

local Handle = Tool.Handle
local animationTrack = animator:LoadAnimation(Anim)
local Players = game:GetService("Players")
local lastAttack = 0
local localPlayer = Players.LocalPlayer

local idleTrack = animator:LoadAnimation(idle)
idleTrack.Looped = true
idleTrack:Play()
local function idle()
    while Tool.Enabled == true do
        idleTrack:Play()
        print "I'm bored"
        wait(5)
    end
end

local function Hooray(Tool, Anim)
    if lastAttack < 0.1 then
        idleTrack:Stop()
        animationTrack:Play()
        lastAttack = 2
        idleTrack:Play()
        print "yay"

        wait(2)
    elseif lastAttack > 0.1 then
        lastAttack = lastAttack + 0.2
        print(lastAttack)
    end
end

local function Cooldown()
    if lastAttack == 2 then
        while lastAttack > 0 do
            lastAttack = lastAttack - 0.1
            wait(0.1)
        end
    end
end
Tool.Activated:Connect(Hooray)
Tool.Equipped:Connect(idle)
Tool.Deactivated:Connect(Cooldown)

This is a local script, located inside a model, inside a part, inside a tool. Like I said, it throws no errors and all the logs go through (on the client side only, though) when I run it through the client, so I really don't know what else to do.