MLB issued a clarification of the batter set rule in regards to the pitch timer in the wake of Willson Contreras causing two quick-pitch calls against Kenley Jansen.

From now on, when a batter gets into a hitting position and engages with the pitcher, with one or both feet out of the box, he’ll be warned and then assessed a strike on subsequent violations, according to the memo.

Chronic offenders will be subject to further discipline by the commissioner’s office. Teams were informed in early March that pitchers were prohibited from quick pitching, while this clarification restricts batters from inducing such action.

Pitchers must continue to be aware of the position of the batter and identify when he is “appropriately” in the batter’s box and alert to the pitcher before the pitcher begins the windup or comes set, according to the memo.

ESPN.com

I have been rather impressed with MLB quickly adjusting to players attempting to game the pitch-clock rule. The spirit of the rule is to speed the game along, not to invent ways to induce the other player to do something wrong.