Pittsburgh also will send the Giants cash to cover part of McCutchen's $14.75 million salary.
"It's no secret that we were looking to further add run production to our lineup," said Brian Sabean, Giants executive vice president of baseball operations. "Anytime you have the opportunity to bring aboard someone with such a track record, you have to jump on it."
The 31-year-old McCutchen, a former National League MVP and the face of the Pirates' franchise, became the second star jettisoned by Pittsburgh in three days. Ace Gerrit Cole was traded toHoustonon Saturday.
Pirates chairman Bob Nutting said the trade was "one of the most emotionally agonizing decisions that we have had to make in my tenure."
"Andrew helped create so many special memories both on and off the field for me, our organization and our fans. He did so while always carrying himself with humility, dignity and grace," Nutting said.
Pittsburgh ended a two-decade postseason drought in 2013 and made three straight playoff appearances before falling to 78-83 in 2016 and 75-87 last year.
"Making the right decision for the Pirates organization is at times difficult and, on rare occasions, painful," Pirates president Frank Coonelly said. "No player was more disappointed than Andrew that we did not break through and win a World Series championship for the city of Pittsburgh."
Earlier in the offseason, the Giants acquired third baseman Evan Longoria fromTampa Bay.
McCutchen, the 2013 NL MVP, takes over in center from Denard Span, who was traded to the Rays in the Longoria deal. San Francisco wanted more production and steady defense from the center field position after a last-place season in the NL West.
The Giants are hoping McCutchen will bolster an outfield that lacks proven veteran depth beyondHunter Pence, who tweeted a welcome to McCutchen on Monday:
"Andrew is a dynamic player on the field and will be a leader in our clubhouse," Giants manager Bruce Bochy said. "He's always been a threat at the plate and he's a guy you don't ever want to deal with whether he's at the plate or on the bases. He's going to make something happen."
The durable McCutchen has played at least 153 games in each of the past three seasons for the Pirates, batting .279 with 28 home runs and 88 RBIs in 156 games in 2017. But he has not been an All-Star since 2015, when he was selected for the fifth straight season.
McCutchen is entering the final season of a six-year, $51.5 million contract he signed in March 2012, a deal that turned into a bargain as he became a star and powered Pittsburgh's turnaround.
Pittsburgh never made it past the NL Division Series and the club has fallen well back ofSt. Louisand the Chicago Cubs in the competitive NL Central the past two seasons. The Pirates began an overhaul when they traded Cole to Houston on Saturday for pitchers Joe Musgrove and Michael Feliz, third baseman Colin Moran and outfielder Jason Martin.
"Watching Andrew patrol center field with grace, fly around the bases, drive the ball all around the ballpark, celebrate with his teammates or interact with his family, friends or fans has created lifelong memories," Pirates general manager Neal Huntington said.
McCutchen's exit leaves the Pirates without a marquee player, something he has been since the moment he made his major league debut on June 4, 2009. His arrival signaled Pittsburgh's intention to emerge from two decades of mediocrity. McCutchen was an All-Star by 2011, a charismatic presence in the clubhouse, one who was beloved by a fan base that he helped reconnect with the game.
Now he's off to San Francisco, which at 64-98 stumbled to its worst record since 1985 last season.
Crick, 25, had a 3.06 ERA, 28 strikeouts in 32 innings and a .191 opponents' batting average in 2017, his first big league season, allowing three of 21 inherited runners to score.
"Kyle Crick is a physical, major league-ready right-handed reliever who brings a high-velocity, live fastball complemented by a quality slider to potentially pitch in a late-inning role for the Pirates," Huntington said.
Reynolds, a 22-year-old switch-hitter, batted .312 with 26 doubles, nine triples, 10 homers and 63 RBIs with Class A San Jose.
Former MVP McCutchen traded to Giants
Tim Kurkjian breaks down how Andrew McCutchen can help the Giants and reflects on the former MVP's legacy in Pittsburgh.