Cust, 32 in January, hit .272/.395/.438 in 425 plate appearances for the Athletics before being non-tendered this month. He's spent time at the outfield corners and designated hitter, and will probably stick to the latter for Seattle. He is represented by TWC Sports.
Morosi (Twitter link) first broke the news of the agreement and the terms, with Geoff Baker of the Seattle Times adding that Cust can match last year's $2.65MM salary through incentives. Susan Slusser of the San Francisco Chronicle first tweeted a deal was close.
Mark Polishuk contributed to this post