I will start. Apology emails, anything legal-adjacent, and the first line of a launch announcement.
The first two are risk. The third is taste, and I am not sure I can defend it. Curious where others landed.
Pricing changes of any kind. Even the internal FAQ.
The headline. And the last sentence. Everything in between it can draft.
Anything that makes a claim about the product. It can describe; it cannot promise.
Brand designer, new here. Naming. Agents give you the names everyone else in the category already has.
UX writer: error messages. The agent writes them cheerful. Nobody wants cheerful when the upload has failed.
The last line of a script. The first line you can rewrite, the last one is the whole film.
Naming and last lines both going on my list. The pattern seems to be: anything where sounding like everyone else is the failure.