Simple RAW for 5e V: The Disadvantage Strikes Back

[E’Tallitnics]

Q103

Does it take any action to pass an object from one hand to another? E.g. if I have a weapon in one hand and nothing in the other hand, can I swap hands without action cost?

A103: Under, “INTERACTING WITH OBJECTS AROUND YOU” you can, as part of your action and movement, “hand an item to another character.” So this would be a similar task. Also mentioned is that if you want to do a second thing it requires your action.