The Boston Magazine masthead is changing again. The monthly mag announced Wednesday that Carly Carioli is done as editor after 2½ years. It’s not clear if Carioli, a former Boston Phoenix staffer who worked at Boston.com briefly before joining Boston Magazine in 2013, is leaving for another job or, like some of his predecessors, just leaving. “The past two years have been extremely gratifying, and I’m proud of everything we’ve accomplished together,” Carioli said in a statement, citing new digital initiatives and the launch of a Chinese-language edition of the magazine. Rick Waechter, president of Metro Corp., which owns the magazine, called Carioli a “great team player.” His last day will be Dec. 31. For now, executive editor Rachel Slade and senior editor Chris Vogel, along with design director Eric Mongeon, will be in charge.