Here's the stack:
sky@sky:/secondary/builds/build1/src$ git cl status
Branches associated with reviews:
Traceback (most recent call last):
  File "/usr/local/google/home/sky/depot_tools/metrics.py", line 225, in print_notice_and_exit
    yield
  File "/usr/local/google/home/sky/depot_tools/git_cl.py", line 6013, in <module>
    sys.exit(main(sys.argv[1:]))
  File "/usr/local/google/home/sky/depot_tools/git_cl.py", line 5995, in main
    return dispatcher.execute(OptionParser(), argv)
  File "/usr/local/google/home/sky/depot_tools/subcommand.py", line 252, in execute
    return command(parser, args[1:])
  File "/usr/local/google/home/sky/depot_tools/metrics.py", line 210, in _inner
    return self._collect_metrics(func, command_name, *args, **kwargs)
  File "/usr/local/google/home/sky/depot_tools/metrics.py", line 167, in _collect_metrics
    result = func(*args, **kwargs)
  File "/usr/local/google/home/sky/depot_tools/git_cl.py", line 4380, in CMDstatus
    c, status = output.next()
  File "/usr/local/google/home/sky/depot_tools/git_cl.py", line 4095, in get_cl_statuses
    cl.EnsureAuthenticated(force=False, refresh=True)
  File "/usr/local/google/home/sky/depot_tools/git_cl.py", line 1954, in EnsureAuthenticated
    raise NotImplementedError
NotImplementedError