COEUR d’ALENE — Levi Grassi didn’t enter the house with his pals last December to mug anyone.

He didn’t know about the planned robbery, or the knife, but he knew why he was there.

Grassi, 15, told police he was asked to join three other teenagers at the house along Interstate 90 near Atlas Road because they wanted him to film something.

That was before the Lake City High School student was booked into jail late last year and charged with robbery, a felony that can carry a life prison sentence.

At a Wednesday hearing in First District Court, which Grassi attended with his mother, Judge John Mitchell didn’t accept the two years of supervised probation as part of a withheld judgment recommended by attorneys.

Mitchell instead added another year to the recommendation. He sentenced the teenager to three years supervised probation with a list of stipulations that included getting a full-time job or attending school full time, and prohibiting Grassi from using alcohol or drugs, or even from being in a home where alcohol was stored in a cupboard. Grassi must also serve 300 hours of community service.

The young man with the checked flannel shirt and flowing hair quietly accepted the terms of his probation.

According to the 18-year-old victim, the teenage boys including Grassi, Dylan Hoard, 17, Joshua Dykeman, 14, and Andiubal Reyes-Batista, 17, walked into his house on the 2900 block of North Lodgepole Road via the back door and pressed a 12-inch, “very long” steak knife against his neck.

The victim said Hoard pinned his arms behind his back and pressed him against a wall while Reyes-Batista held the knife blade against the skin of his neck. Dykeman yelled for Reyes-Batista to “stab him,” while Grassi “stood at the door and looked away,” a police report says.

The victim concluded Grassi might not have been apprised of the plan to rob him.

“He did not believe Levi knew exactly what was going on,” according to the police report.

Reyes-Batista then went into the victim’s bedroom and stole a red Air Jordan sweatshirt, two Air Jordan hats and a vape mod, before the four teenagers left the house.

When Reyes-Batista was arrested later that day, along with the others, he was wearing the sweatshirt but denied any wrongdoing.

All four teens were booked on robbery charges.

As part of an amended indictment, Reyes-Batista was charged with accessory to a felony, willfully harboring a felon, and disturbing the peace, as well as a new charge of destroying jail property. A Friday hearing is set in the case. Dykeman was also charged with accessory and will be arraigned July 8, and Hoard pleaded guilty to accessory to a felony. His sentencing is July 15. Accessory to a felony carries half the penalty of the felony named in the charge.

Grassi told the court he plans to attend summer school. If that is the case, Mitchell said, Grassi will still be required to get a part-time job.