https://gyazo.com/a9dcc546b35b1ad7e820128ac29083c9
As demonstrated at the start of the GIF, I have a "sword hold" animation that plays when a weapon is equipped (that part works perfectly fine). The only problem is that the player's right arm becomes overridden by the default Roblox tool-wielding animation. I've tried everything to fix it.
I've:
1- Tried to play around with the priority level of my "sword hold" animation.
2- Replacing the animations at game.Players.LocalPlayer.Character.Animate.tool-----.AnimationId = ""
3- (I was impatient at this point)
game.Players.LocalPlayer.Character.Animate.toolnone:Destroy()
game.Players.LocalPlayer.Character.Animate.toollunge:Destroy()
game.Players.LocalPlayer.Character.Animate.toolslash:Destroy()
4- I decided to check the Wiki to see if I could find any info on this but I couldn't find anything.

4 comments
Did you try changing the priority to action?
I'm not that familiar with the ROBLOX animator plugin, but if priorities aren't working correctly, it could be a bug with the update they released. If nothing else is working, you could try just welding the tool to your arm.
@ScriptGuider That's my last resort. Priority doesn't seem to be the problem -- I wrote a script to make it at the highest priority (action) to check but I still got the same result. There has to be an easier way to do this than with welding...
Welding is really easy. It's just about setting the CFrame of the tool to the inverse of the arm's CFrame, plus some offset. That's how ROBLOX tools function.