text: 0       3      on_llm_start  OpenAI     1       1     0       0         0       4      on_llm_start  OpenAI     1       1     0       0         0       ..              ...     ...   ...     ...   ...     ...       ...       66      on_tool_end     NaN    11       7     4       0         0       67     on_llm_start  OpenAI    12       8     4       0         0       68       on_llm_end     NaN    13       8     5       0         0       69  on_agent_finish     NaN    14       8     6       0