docs: def make_user_agent(prefix=None):
      """Get a suitable user agent for identifying the CLI process."""
      prefix = (prefix or platform.platform(terse=1)).strip().lower()
      return "cloudsmith-cli/%(prefix)s cli:%(version)s api:%(api_version)s" % {
          "version": get_cli_version(),
          "api_version": get_api_version(),
          "prefix": prefix,
      }