Docs for robot API states:
robot.swing():
Makes the robot use the item currently in the tool slot against the block or space immediately in front of the robot in the same way as if a player would make a left-click.

However, when I give the Draconic evolution sword (with radius attack = 6 and damage = 46.75):

• the robot can't reproduce the damage
• the swing() doesn't utilize the radius of attack
• the robot can't get the durability of the item equipped