Adams was recalled from Triple-A Syracuse on Friday, Mark Zuckerman of MASNsports.com reports.
Adams appeared in one game for Washington earlier this season but spent the bulk of the campaign at Syracuse, where he posted a 2.14 ERA, 1.37 WHIP, and 91:37 K:BB over 59 innings of relief. He has intriguing strikeout potential but figures to be limited to a middle-relief role.