With just days left until 49ers training camp opens, the team's new offensive coordinator is not about to declare that his playbook is a bible for instant success and an undefeated season and free beer for the entire upper deck at Levi's Stadium.

Geep Chryst knows better.

"The thing is, we're not in a position right now to boast or brag or tell the world what we're going to do," Chryst said Monday toward the end of a 45-minute interview at team headquarters. "We're not. We have to go to work. And we have to earn the respect of each other and our teammates. And then we'll go out and try to take care of business."

By any measure, Chryst will be a significant part of that business. His promotion from 49ers quarterbacks coach to coordinator was not the sexiest headline in a tumultuous offseason. But now the actual football begins. Chryst's role will come into sharp focus.

He's a convivial guy who loves talking shop, which fans should enjoy. Chryst's predecessor, Greg Roman, was an earnest grinder but sometimes gave the impression that he was trying to find the formula for nuclear cold fusion. Chryst has simplified the 49ers' play calling. He's a strong believer in team chemistry. He grew up with the game. His dad was a coach at Wisconsin. Then Geep went off to play linebacker at Princeton and earn an Ivy League degree before starting a coaching career that has spanned 22 NFL seasons with five franchises.