Accessing CAS modifiers from script

The "Facial Attributes" protocol buffer message is defined as such:

message BlobSimFacialCustomizationData
{
    message Modifier
    {
        optional uint64 key = 1;
        optional float amount = 2;
    };

    repeated uint64 sculpts = 1 ;
    repeated Modifier face_modifiers = 2;
    repeated Modifier body_modifiers = 3;
}

The resource types are:

Sculpts: 0x9d1ab874
Modifiers: 0xc5f6763e

Here is a sample command that randomizes a Sim's attributes during gameplay:

@sims4.commands.Command('cas.randomize_facial_attributes', command_type=sims4.commands.CommandType.Live)
def randomize_facial_attributes(opt_sim:OptionalSimInfoParam=None, _connection=None):
    from protocolbuffers import PersistenceBlobs_pb2
    
    sim_info = get_optional_target(opt_sim, target_type=OptionalSimInfoParam, _connection=_connection) 
    if sim_info is None:
        return False
    
    facial_attributes = PersistenceBlobs_pb2.BlobSimFacialCustomizationData()
    facial_attributes.MergeFromString(sim_info.facial_attributes)
    
    for modifier in itertools.chain(facial_attributes.face_modifiers, facial_attributes.body_modifiers):
        modifier.amount = random.random()
        
    sim_info.facial_attributes = facial_attributes.SerializeToString()
    return True

Hope that helps!

Edit: updated command type