[
  {
    "kind": "chunks",
    "chunks": [
      { "type": "block-start", "index": 0, "blockType": "tool-call" },
      { "type": "tool-call-delta", "index": 0, "id": "call_root_child", "name": "subagent", "argumentsDelta": "{\"description\":\"Start depth one\",\"prompt\":\"Call subagent once. Ask that child to attempt one further subagent call, then report the result.\"}" },
      { "type": "block-end", "index": 0, "block": { "type": "tool-call", "id": "call_root_child", "name": "subagent", "arguments": "{\"description\":\"Start depth one\",\"prompt\":\"Call subagent once. Ask that child to attempt one further subagent call, then report the result.\"}" } },
      { "type": "usage", "usage": { "inputTokens": 10, "outputTokens": 5 } },
      { "type": "finish", "reason": { "kind": "tool-calls" } }
    ]
  },
  {
    "kind": "chunks",
    "chunks": [
      { "type": "block-start", "index": 0, "blockType": "text" },
      { "type": "text-delta", "index": 0, "text": "ROOT_DONE" },
      { "type": "block-end", "index": 0, "block": { "type": "text", "text": "ROOT_DONE" } },
      { "type": "usage", "usage": { "inputTokens": 10, "outputTokens": 2 } },
      { "type": "finish", "reason": { "kind": "stop" } }
    ]
  }
]