How do I make this when equipped it plays it but it doesn't repeat?

Alright, I'm making a simple transparency punch and this is what I have issues with

while true do
wait(.5)
script.Parent.Transparency = 0
	wait(0.2)
	script.Parent.Transparency = 0.5
	wait(0.2)
	script.Parent.Transparency = 0.5
	wait(0.5)
end

This is the repeat, this ruins what i'm trying to make and induces alot more work for me to do for no reason.

This is my non-repeat script, works well and fine but it doesn't do transparency ever again, like EVER.

wait(.5)
script.Parent.Transparency = 0
	wait(0.2)
	script.Parent.Transparency = 0.5
	wait(0.2)
	script.Parent.Transparency = 0.5
	wait(0.5)

Is there any way to fix?

Use Tool.Equipped to achieve the effect you want, assuming you're equipping a tool.

Sample (local inside tool):

local tool = script.Parent

tool.Equipped:Connect(function()
    -- the code inside here will run whenever the player equips the tool, shocking.
    print("i've been equipped!")
end)