Great point. Claude Cowork has been decent at creating and partially implementing effective marketing campaigns for us. A couple of suggestions. Have an agent draft a plan, then open another thread to critique it. Oddly effective. Also good for drafting voice style guides and brand style guides. Execution, less so. But for channels with which you are unfamiliar, agents are really code at provding a quick education.
perhaps someone here already has a shortlist they are collecting in this emerging space? if so, please post or keep the list growing publicly on github