Canonicalized echo of the agent_url that was looked up.
When the directory last completed a refresh of any publisher in this result. NULL on empty pages — treat null as "no freshness assertion" and do not advance local cache freshness.
Optionalnext_Opaque pagination cursor. Absent or null on the terminal page.
Single-page response envelope from
GET /v1/agents/{agent_url}/publishers. Mirrors the AAOagent-publishers.jsonschema.