The signing of the 29-year-old quick was being hailed as a real coup by the most historic of English teams, who will now have three Western Australia players on their books this summer.
Richardson, whose form over the Australian summer was recognised with a fourth Test appearance and a second Ashes outing at the MCG, will play in the first block of county championship division one games this season with Yorkshire targeting the title.
"I'm really pleased to be joining Yorkshire. The history of the club and of Headingley goes without saying, so to be coming here and playing red-ball cricket for the first time is an immense privilege," said Richardson, who's a three-format international for Australia.
"Can't wait to get over and represent the White Rose, and hopefully putting some performances on the board. Can't wait to see you," the county debutant added in a social media post.
Richardson's WA colleagues Sam Whiteman and AJ Tye will also play for the Headingley-based county, with Yorkshire impressed by them being a key part of Western Australia's and Perth Scorchers' success in recent years.
Richardson, despite featuring in Australia's only loss in the 4-1 Ashes triumph, managed to get the prized scalp of England's record run-getter Root as one of his two second-innings wickets.
Back in 2021, Richardson did star in an Australian Ashes triumph at Adelaide, taking five second-innings wickets in their 275-run win, only to lose his place in the next match such was the depth of their bowling stocks.
Root is a hero at the Leeds-based club, where Richardson's skill in moving the ball both ways at high speed is seen as a real asset, trumping his reputation as being somewhat injury-prone over his 10-year career.
During that period, though, he's taken 122 first-class wickets at an average of 20.44.
"Getting Jhye is a huge boost for us, and his quality underlines our ambition to build a squad capable of seriously competing in the county championship. We're thrilled to have secured him," said Gavin Hamilton, Yorkshire's general manager.
Richardson, who can boast dismissing Virat Kohli in three successive ODIs, most recently demonstrated his effectiveness by claiming three wickets in the Scorchers' BBL final triumph in Perth in January.
