To create a joint chain with an IK handle
The Joint Tool settings panel appears.
This makes the IK Handle Settings available in the same tool panel.
For example, set the Current solver option to Single-Chain or Rotate-Plane, depending on which type of IK solving you want to use when manipulating this joint chain. See also IK solvers.
Now when you create a joint chain with the Joint Tool, an IK handle is automatically created with the joint chain.