curl --request POST \
  --url https://api.galileo.ai/v2/projects/{project_id}/spans \
  --header 'Content-Type: application/json' \
  --header 'Galileo-API-Key: <api-key>' \
  --data '{
  "log_stream_id": "00000000-0000-0000-0000-000000000000",
  "parent_id": "11000011-0000-0000-0000-110000110000",
  "spans": [
    {
      "created_at": "2025-07-17T17:14:54.767941Z",
      "dataset_metadata": {},
      "input": "who is a smart LLM?",
      "metrics": {},
      "name": "",
      "output": "I am!",
      "spans": [
        {
          "created_at": "2025-07-17T17:14:54.752509Z",
          "dataset_metadata": {},
          "id": "22222222-2222-4222-a222-222222222222",
          "input": [
            {
              "content": "Question: who is a smart LLM?",
              "role": "user"
            }
          ],
          "metrics": {},
          "name": "",
          "output": {
            "content": "I am!",
            "role": "user"
          },
          "tags": [],
          "type": "llm",
          "user_metadata": {}
        }
      ],
      "tags": [],
      "type": "workflow",
      "user_metadata": {}
    }
  ],
  "trace_id": "11000011-0000-0000-0000-110000110000"
}'

{
  "log_stream_id": "<string>",
  "experiment_id": "<string>",
  "project_id": "<string>",
  "project_name": "<string>",
  "session_id": "<string>",
  "records_count": 123,
  "trace_id": "<string>",
  "parent_id": "<string>"
}