The 32-year-old Wuertz went 0-0 with a 6.68 ERA in 39 relief appearances for the A's last season, which he started on the disabled list with a strained left hamstring. Wuertz had a $3.5 million team option and is due a $250,000 buyout.
Scribner, who began the season at Triple-A Tucson, posted a 7.07 ERA in 10 appearances over two stints with San Diego in his injury-shortened rookie season.
Hunter made San Diego's opening day roster before being optioned to Tucson on April 9. He batted .255 with two home runs and 33 RBIs in 81 games before going on the DL on July 17 for the rest of the year with a strained right groin.