All three were members of the Warriors Summer League team.
Marc J. Spears of Yahoo Sports reports that McAdoo's contract is for one year.
McAdoo, a distant cousin of former All-Star Bob McAdoo, went undrafted after averaging 14.2 points and 6.8 rebounds at North Carolina last season. The 6-foot-9, 230-pounder averaged 9.0 points and 5.4 rebounds in five summer league games with Golden State.
Craft also went undrafted after four years at Ohio State, earning Big Ten Defensive Player of the Year honors in his senior season. He led Golden State in assists and steals during the Summer League.
Watt has spent the last two seasons playing professionally in Israel, averaging 13.4 points and 6.6 rebounds last season.
The Warriors went 51-31 and earned the No. 6 seed in the Western Conference last season before losing to the Clippers in the first round of the playoffs.
- Chris Johnson