Smyly, 30, split last season between the Rangers and Phillies with a stint with the Brewers in between. He did not appear in a major league game with the Brewers. In aggregate, Smyly posted a 6.24 ERA with 120 strikeouts and 55 walks over 114 innings.
Smyly will vie for a spot at the back of the Giants' starting rotation. If he doesn't make the cut, he could work out of the bullpen. Pitching in the spacious confines of Oracle Park should help Smyly, who gave up 19 homers in Texas and 13 in Philly last season in more hitter-friendly parks.