[tacone]

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

[tacone]

Also for future reference, Copilot - specifically - includes a configuration flag to toggle the co-authorship (see `copilot help config`):

> `includeCoAuthoredBy`: whether to instruct the agent to add a Co-authored-by trailer to git commits; defaults to `true`.

This means that, if you don't explicitely configure otherwise, the LLM is specifically instructed to include co-authorship in its higher level instructions.