via Photo Source
Per Clayton, citing a source, the contract's duration is one year.
Updates to follow...
This gives the Chiefs ten wide receivers on the roster: Dwayne Bowe, Mark Bradley, Bobby Engram, Terrance Copper, Devard Darling, Taurus Johnson, Quinten Lawrence, Jeff Webb and Rodney Wright.
Adam Teicher of the Kansas City Star confirms and says Toomer will be at today's afternoon practice, which starts in about an hour.