It doesn't work so well in my experience. I am currently wrapping (or asking the LLM to wrap) the commit message prompt in a script call.

   1. the LLM is instructed on how to write a commit message and never include co-authorship
   2. the LLM is asked to produce a commit message
   3. the LLM output is parsed by a script which removes co-authorship if the LLM chooses to include it nevertheless