Kent, 18, joins Louis Rossi to complete Herve Poncharal's team's line-up in the class.
"I am delighted to be joining the Tech 3 Racing Moto2 Team for 2013 and this is a great opportunity for me to take my career to the next level," he said.
"I am under no illusions how difficult racing in the Moto2 class is going to be, but I can't think of a better team to join than Tech 3 Racing to help me learn.
"Herve Poncharal is somebody I have a lot of respect for and the team is very professional and I had no hesitation in agreeing to sign when I knew how much they wanted me.
"I feel ready to make this step because my physical size is not ideal for the Moto3 class, and I can't wait to start learning and understanding the Mistral 610 machine.
"The bike has been close to the podium this season, which gives me a lot of confidence in its potential. I want to finish my time in Moto3 with some strong results in the last four races before putting all my focus and energy into preparing for this new adventure with the Tech 3 Racing Team."
Kent finished on the Moto3 podium at Assen has been on the front row in three races in that class this year. He is sixth in the standings.
The satellite squad runs fellow Briton Cal Crutchlow in MotoGP and previously ran double World Superbike champion James Toseland.
Smith is moving up to the premier class to partner Crutchlow in 2013 after two years with them in Moto2.
"Danny is a rider I have admired for a long time and right from the moment we started considering our Moto2 plans for 2013, he was right at the top of the list of candidates," Poncharal said.
"I have no doubt he is a rider with a very big future and I am really looking forward to working with Danny and helping him adapt to the very competitive Moto2 category.
"With Danny and Louis we have shown our commitment to developing young talent and I am convinced we have put together the strongest line-up possible and 2013 will be a successful one for the Tech 3 Racing Team."
- Louis Rossi