Tucker, 28, will join the Reds on Tuesday in Detroit as they start a two-game series against the Tigers. He was a seventh-round pick by the Houston Astros in 2012. He hit .256 in 62 games with the Braves this season and also appeared in 15 games for Triple-A Gwinnett.
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Sims, 24, was the 21st overall pick in the first round in 2012. He was Atlanta’s 18th-ranked prospect in 2017, according to MLB.com, but did not make the top 30 this year.
Sims made his big-league debut in 2016 and was 3-6 with a 5.62 ERA in 14 appearances and 10 starts. He was 4-3 with a 2.84 ERA in 14 starts this season at Triple-A and had a 7.84 ERA in six appearances with the Braves.
Sims and Wisler, 25, will be assigned to a roster Wednesday when they are expected to report.
Wisler is from Bryan, Ohio. The San Diego Padres drafted him in the seventh round in 2011. He made his big-league debut with the Braves in 2015. This year, he was 1-1 with a 5.40 ERA in seven games.