The Marlins designated Jones for assignment Friday.
The transaction frees a spot on the 40-man roster for Robby Snelling, who has been summoned for his major-league debut Friday. Jones was just called up Thursday and did not make an appearance.
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Marlins' Stephen Jones: Added to big-league bullpen
Rotowire
The Marlins selected Jones' contract from Triple-A Jacksonville on Thursday.
Jones earned the promotion by holding a 3.24 ERA and 19:13 K:BB over 16.2 frames with Double-A Pensacola this season. The 28-year-old will be making his major-league debut when/if he enters a game.