Defining any particular Accountability in terms of what to do destroys it. As soon as you say it’s this or it’s that, you reduce the risk of true Accountability. “I did what I was told to do” really means, “I’m not accountable for the result.”
The power of every Accountability is in its un-limitedness. At its best, it’s the freedom to achieve an outcome not yet attained on a path never taken. The bigger the Accountability, the larger the challenge. It’s a personal choice someone freely makes requiring real thinking to successfully fulfill.
Job Descriptions typically offer guidance, telling people what to do. But if you have to do the thinking for someone, you might as well do it yourself.