Williams and Javier Baez were sent from the Cubs to the Mets in exchange for Pete Crow-Armstrong on Friday, Ken Rosenthal of The Athletic reports.
Williams could give the Mets' rotation depth for now but may move to the bullpen down the stretch as the team gets healthier. He hasn't been particularly good in 12 starts and one relief appearance for the Cubs this season, posting a 5.06 ERA and 1.53 WHIP, and he hasn't finished with an ERA below 5.00 since 2018.