How can I change the animation of a player holding a tool?

So I want to change the way a player holds an item on idle. I want to change where instead of the player holding a tool with its right arm, it holds the tool with its right arm lifted up. I used this local script and put it as a child of my tool. I put the idle animations as a child of the local script. I've try everything but nothing seems to work.

This is the script I used

local tool = script.Parent

tool.Equipped:Connect(function()
    local idle = script.Parent.Parent.Humanoid:LoadAnimation(script.Idle)
    idle:Play()
end)