To make room for Skaggs, left-hander Eury De La Rosa was optioned to Reno.
• Brandon McCarthy's right shoulder felt good throughout his 4 1/3 inning rehab stint for Reno on Sunday.
It was McCarthy's first rehab outing since going on the disabled list May 31, and he allowed just one run through the first four innings before running out of gas and giving up five in the fifth.
Steve Gilbert is a reporter for MLB.com. Read his blog, Inside the D-backs, and follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.