The team confirmed the agreement Saturday. Jones' agent, Mike McCartney, said on Twitter the deal is for one-year and a league source told ESPN NFL Insider Adam Schefter the deal is worth $4.5 million fully guaranteed with an additional $500,000 in performance incentives.
Jones has spent his first four seasons with the Tennessee Titans where he had 15½ sacks. He was used as a defensive tackle and end last season, and his versatility fits with Seattle's defensive philosophy. The 6-foot-5, 276-pound Jones started 15 games in 2010 and 13 last season.
Information from The Associated Press contributed to this report.