Hey @jmiddleton , I also encountered this issue but just solved. You gotta add api_key into OpenAIChatClient(), but this api_key won't be used somehow. This param is useless but they need to have it ...
os.path.join (folder, filename) ensures the path is correct for the system. On Windows, it uses backslashes (reports\summary.txt); on Linux and macOS it uses forward slashes (reports/summary.txt).