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Prosecutors have said the 17-year-old told several students about his plans to shoot up South Portland High School and asked at least one other student to help.
Maine's juvenile justice system defaults to privacy, but a South Portland case has frustrated prosecutors, who say the community has a right to know the threats.
The 17-year-old will be held at the Long Creek Youth Development Center for at least a week. Prosecutors say he participated in hateful social media group chats.
After a student was arrested in April and accused of threatening the school, a lockdown last month reignited some teachers' frustration with how little they know about his arrest.
District Court Judge Peter Darvin did restrict the types of information prosecutors can publicly share in the case against Tristan Hamilton, 17, who is charged with trying to convince another person to kill students, faculty and staff at South Portland High School.