A bone anchor system may include a bone anchor assembly and a driver tool. The bone anchor assembly may generally include a bone screw, a collar member, and a tulip member. The collar member may include first and second retaining arms configured to receive a retaining feature of the driver tool. The driver tool may be removably couplable to the bone anchor assembly by inserting the retention feature between the first and second retaining arms of the collar member, such that the retention feature is retained by the first and second retaining arms of the collar member.
