Boston Public Schools Superintendent Tommy Chang on Friday said he has agreed to resign from his post, amid growing concerns from Mayor Martin J. Walsh about his struggle to deliver significant improvements to the city’s school system.

In an interview Friday afternoon, Chang confirmed he is stepping down after three years, and said he is in active negotiations with the Boston School Committee “for a mutual parting of ways.”

Chang declined to describe the reasons for his departure, but he noted he does not have a job lined up elsewhere.

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