curl --request GET \
  --url https://api.example.com/threads/{thread_id}/state/{checkpoint_id}

{
  "values": {},
  "checkpoint": {
    "checkpoint_id": "<string>",
    "thread_id": "<string>",
    "checkpoint_ns": ""
  },
  "next": [
    "<string>"
  ],
  "tasks": [
    {}
  ],
  "interrupts": [
    {}
  ],
  "metadata": {},
  "created_at": "2023-11-07T05:31:56Z",
  "parent_checkpoint": {
    "checkpoint_id": "<string>",
    "thread_id": "<string>",
    "checkpoint_ns": ""
  },
  "checkpoint_id": "<string>",
  "parent_checkpoint_id": "<string>"
}