Something that happens quite frequently in the industry is that your agent will say you are “on hold” for a part. The first time you hear it, it can be confusing, and it is a part of the industry that can be likened to limbo. On one hand, congrats!!! You almost have the job! On the other hand, “on hold” could mean several things and you don’t have the job YET so don’t get too excited.
“On hold” can mean that the job is up in the air and the producers don’t know if they want you or another actor to play the role. It can also mean that they are considering you for a different role, or seeing if the other previously cast actors feel chemistry with you, or, or, or… “On hold” means that they want you but they’re not 100% sure, so wait here and don’t take any other jobs while we decide. It can be awesome when you book the job. Not so awesome when you don’t.
If you are put on hold or not is up to you. It is technically time that could be spent booking something else so always keep that in mind while considering the project that you are being put on hold for. All in all, it’s way better than a callback. So pat yourself on the back and keep looking forward!