when using a tool my walking/ idle animation doesn't work, does anyone know how to fix this?

when I hold out the sword my right arm will be holding the sword like normal but when I use a running animation the sword will move as well as my right arm

This is because of the animation action you want your running animation action to be 1 lower then your holding animation. Inside of the animator open your running animation and set the animation priority to be action 1, After that open your holding animation and set its animation priority to be action 2