$ python tune.py   # gemini-3.8-flash
req-1: How do I roll back production?
  model  call with 1 contents
  event call   state_delta={} stored[last_page]=None metadata={'request_id': 'req-1'}
  tool   request_id=req-1 state[last_page]='rollback' stored[last_page]=None
  event result state_delta={'last_page': 'rollback'} stored[last_page]='rollback' metadata={'request_id': 'req-1'}
  model  call with 3 contents
  event answer state_delta={} stored[last_page]='rollback' metadata={'request_id': 'req-1'}
  answer: Run `shipctl rollback --env production` to roll back to the previous release. To roll back to a specific release, specify `--to` (for example, `shipctl rollback --env production --to r41`). Note that database migrations are not rolled back.
req-2: Which page covers CI tokens?
  model  call with 5 contents
  event call   state_delta={} stored[last_page]='rollback' metadata={'request_id': 'req-2'}
  tool   request_id=req-2 state[last_page]='tokens' stored[last_page]='rollback'
  event result state_delta={'last_page': 'tokens'} stored[last_page]='tokens' metadata={'request_id': 'req-2'}
  model  call with 7 contents
  event answer state_delta={} stored[last_page]='tokens' metadata={'request_id': 'req-2'}
  answer: The `tokens` page covers CI tokens and authenticating shipctl in CI jobs.
req-3: What was my first question?  (num_recent_events=4)
  model  call with 5 contents
  event answer state_delta={} stored[last_page]='tokens' metadata={'request_id': 'req-3'}
  answer: Your first question was: "Which page covers CI tokens?"

# the same session, capped at 3 events
  model  call with 4 contents
  event error  state_delta={} stored[last_page]='tokens' metadata={'request_id': 'req-3'} error_code=INVALID_ARGUMENT
  raised google.genai.errors.ClientError: 400 INVALID_ARGUMENT. {'error': {'code': 400, 'message': 'Please ensure that function call turn comes immediately after a user turn or after a function response turn.', 'status': 'INVALID_ARGUMENT'}}

# a 1 ms model-call timeout
req-1: How do I roll back production?  (timeout=1 ms)
  model  call with 1 contents
  event error  state_delta={} stored[last_page]=None metadata={'request_id': 'req-1'} error_code=TimeoutError
  raised builtins.TimeoutError: