>How much precedence is there for machines or tools getting an author credit in research?

For a datum of one, the mathematician Doron Zeilberger give credit to his computer Shalosh B. Ekhad on select papers.

https://medium.com/@miodragpetkovic_24196/the-computer-a-mys...

https://sites.math.rutgers.edu/~zeilberg/akherim/EkhadCredit...

https://sites.math.rutgers.edu/~zeilberg/pj.html