Michael Strahan and his ex-wife hired someone to help them work through their conflicts so they can parent better together ... but now they're squabbling about that.
According to legal docs -- obtained by TMZ -- the NFL Hall of Famer and talk show host reached an agreement with his ex, Jean Muggli Strahan, in February to use a parenting coordinator ... and he'd cover 90 percent of the bill.
Michael claims she's abusing the arrangement by engaging in a "pattern of conduct designed to increase unnecessarily the involvement of the PC and to significantly increase the fees charged by the PC.