{"role": "user", "text": "Session start."}
{"role": "assistant", "text": "I am ready to help! What would you like to do today?\n", "tool_calls": []}
{"role": "user", "text": "Continue. To end this session, call end_session."}
{"role": "assistant", "text": null, "tool_calls": [{"id": "call_1", "name": "end_session", "args": {"reason": "Continue."}}]}
{"role": "tool_result", "tool_call_id": "call_1", "content": "Session ended.", "is_error": false}