curl --request GET \
  --url https://localhost:8000/v1/mcp/agents/{agent_id}/sessions

{
  "sessions": [
    {
      "user_ids": [
        "<string>"
      ],
      "session_id": "<string>",
      "group_id": "<string>",
      "agent_ids": [
        "<string>"
      ]
    }
  ]
}