The
Colorado Rockies selected Agnos as a pitcher in the 10th round, with the 296th overall selection of the
2022 Major League Baseball draft. He received a $165,000 signing bonus. He pitched once for the
Arizona Complex League Rockies that summer, allowing a home run. He was also named a
California League All-Star. In 2024, Agnos began the season with the High-A
Spokane Indians. In innings across 21 games, he had a 0.73 ERA and 0.69 WHIP with a 10.9 K/9 rate, 0.7 BB/9 rate, and 10 saves. In June, the Rockies promoted Agnos to the Double-A
Hartford Yard Goats, where he posted a 1.95 ERA in innings pitched. He finished the season with a combined 1.38 ERA across High-A and Double-A in 36 outings with 51 strikeouts. Agnos was assigned to the Triple-A
Albuquerque Isotopes to begin the 2025 season. On April 20, Agnos was selected to the
40-man roster and promoted to the major leagues for the first time and made his debut the same day. He did not allow a run in his first six outings, capping that streak with saves on April 30 and May 1. On June 10, Agnos entered in the top of the ninth inning with a three-run lead over the
San Francisco Giants for the save opportunity. He subsequently gave up a solo home run to
Casey Schmitt to start the inning, then issued three walks and another hit while recording only 1 out and was charged with a loss. The next day, Agnos entered another close game, allowing an
inherited runner to score the go-ahead run in another Giants, come-from-behind win. The two losing efforts nearly doubled his ERA from 2.79 to 5.48. Agnos went on the injured list on July 27 with an elbow injury. He returned on September 24. He finished his rookie season with a 1–3 record with 4 saves, a 6.61.ERA, and 19 strikeouts in innings. == Personal life ==