For AI agents: a documentation index is available at the root level at /llms.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
Response mode. summary returns root-span fields without payloads or rollups; preview adds token, cost, and span-count rollups plus 300-character input/output previews; detailed returns rollups and full payloads.
Allowed values:
filterobjectOptional
Filter root-span-backed traces by id, session_id, root status, root span started_at, evaluation_name, test_case_name, and agent_name.