Tobin was placed on the 60-day disabled list on April 20. He missed the remainder of the season while undergoing right elbow ligament reconstruction surgery, which was performed by Dr. James Andrews on June 1 in Birmingham, Alabama.
He had appeared in just 25 professional career games, all in the Angels organization, prior to 2011, missing all of 2010 after right elbow surgery. Tobin was selected by the Chicago Cubs in Major League Rule 5 Draft and then traded to Texas for cash considerations on December 9, 2010.
With today's transaction, Texas has 31 players on its Major League roster.
In addition, the club announced that the five players offered outright assignment on Wednesday, RHP Omar Beltre, INF Andres Blanco, INF Esteban German, RHP Eric Hurley, and RHP Merkin Valdez, have all been granted free agency.