[
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    "_mock": true,
    "_mockReason": "#162 rec 31 (subagent inline under parent's spawn row): parent turn issues a spawn_agent tool call, subagent.started fires, child session ran 3 turns of activity (read → edit → verify), subagent.finished carries a structured JSON return in the parent's tool/result content."
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      "content": [
        { "type": "text", "text": "Have a subagent audit packages/core/session/src for unused exports and delete them, then report the count." }
      ]
    }
  },
  {
    "type": "step/start",
    "time": 1721404000100,
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    "data": { "turn": 9, "step": 0 }
  },
  {
    "type": "assistant/message",
    "time": 1721404000200,
    "seq": 903,
    "data": {
      "content": [
        { "type": "text", "text": "Spawning a subagent to run the audit." }
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    }
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  {
    "type": "tool/call",
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    "data": {
      "callId": "call_spawn_9",
      "name": "spawn_agent",
      "arguments": "{\"prompt\":\"Audit packages/core/session/src for unused exports, delete them, and return {removed: string[], count: number} as JSON.\",\"tools\":[\"read\",\"edit\",\"bash\"]}"
    }
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  {
    "_mock": true,
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    "method": "subagent.started",
    "params": { "parentSessionId": "root-abc", "childSessionId": "sub-def", "parentCallId": "call_spawn_9" }
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        { "type": "text", "text": "Audit packages/core/session/src for unused exports, delete them, and return {removed: string[], count: number} as JSON." }
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      "source": { "kind": "plugin", "plugin": "subagent-delegate" }
    }
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  {
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      "content": [
        { "type": "reasoning", "text": "I'll list the source files first, then walk each one with the export inspector." },
        { "type": "text", "text": "Listing source files." }
      ],
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      "isError": false,
      "meta": { "card": "generic", "durationMs": 72 }
    }
  },
  {
    "_sessionId": "sub-def",
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    "time": 1721404000640,
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    "data": {
      "content": [
        { "type": "text", "text": "legacyHelper looks orphaned; removing it." }
      ],
      "usage": { "inputTokens": 260, "outputTokens": 12 }
    }
  },
  {
    "_sessionId": "sub-def",
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    "data": {
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      "isError": false,
      "meta": { "card": "diff", "durationMs": 44 }
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    "data": {
      "callId": "sub_call_bash_1",
      "content": [ { "type": "text", "text": "typecheck OK (0 errors)" } ],
      "isError": false,
      "meta": { "card": "terminal", "durationMs": 172 }
    }
  },
  {
    "_sessionId": "sub-def",
    "type": "assistant/message",
    "time": 1721404001060,
    "seq": 10,
    "data": {
      "content": [
        { "type": "text", "text": "```json\n{\"removed\":[\"legacyHelper\"],\"count\":1}\n```" }
      ],
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    }
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  {
    "_sessionId": "sub-def",
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    "time": 1721404001100,
    "seq": 11,
    "data": { "turn": 3, "reason": { "kind": "stop" } }
  },

  {
    "_mock": true,
    "type": "_notification",
    "method": "subagent.finished",
    "params": {
      "parentSessionId": "root-abc",
      "childSessionId": "sub-def",
      "parentCallId": "call_spawn_9",
      "status": "ok",
      "lastAssistantMessage": [
        { "type": "text", "text": "```json\n{\"removed\":[\"legacyHelper\"],\"count\":1}\n```" }
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                    "source": { "kind": "plugin", "plugin": "subagent-delegate" } } },
        { "type": "assistant/message", "time": 1721404000420, "seq": 2,
          "data": { "content": [
                      { "type": "reasoning", "text": "I'll list the source files first, then walk each one with the export inspector." },
                      { "type": "text", "text": "Listing source files." } ],
                    "usage": { "inputTokens": 210, "outputTokens": 44, "reasoningTokens": 18 } } },
        { "type": "tool/call", "time": 1721404000460, "seq": 3,
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                    "isError": false, "meta": { "card": "generic", "durationMs": 72 } } },
        { "type": "assistant/message", "time": 1721404000640, "seq": 5,
          "data": { "content": [ { "type": "text", "text": "legacyHelper looks orphaned; removing it." } ],
                    "usage": { "inputTokens": 260, "outputTokens": 12 } } },
        { "type": "tool/call", "time": 1721404000700, "seq": 6,
          "data": { "callId": "sub_call_edit_1", "name": "edit",
                    "arguments": "{\"path\":\"packages/core/session/src/index.ts\",\"old\":\"export { legacyHelper } from './legacy'  // orphan\\n\",\"new\":\"\"}" } },
        { "type": "tool/result", "time": 1721404000760, "seq": 7,
          "data": { "callId": "sub_call_edit_1",
                    "content": [ { "type": "text", "text": "edit applied (1 replacement)" } ],
                    "isError": false, "meta": { "card": "diff", "durationMs": 44 } } },
        { "type": "tool/call", "time": 1721404000800, "seq": 8,
          "data": { "callId": "sub_call_bash_1", "name": "bash",
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          "data": { "callId": "sub_call_bash_1",
                    "content": [ { "type": "text", "text": "typecheck OK (0 errors)" } ],
                    "isError": false, "meta": { "card": "terminal", "durationMs": 172 } } },
        { "type": "assistant/message", "time": 1721404001060, "seq": 10,
          "data": { "content": [ { "type": "text", "text": "```json\n{\"removed\":[\"legacyHelper\"],\"count\":1}\n```" } ],
                    "usage": { "inputTokens": 340, "outputTokens": 22 } } },
        { "type": "turn/end", "time": 1721404001100, "seq": 11,
          "data": { "turn": 3, "reason": { "kind": "stop" } } }
      ]
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    "data": {
      "callId": "call_spawn_9",
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        { "type": "text", "text": "```json\n{\"removed\":[\"legacyHelper\"],\"count\":1}\n```" }
      ],
      "isError": false,
      "meta": { "card": "generic", "durationMs": 840, "childSessionId": "sub-def" }
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  },
  {
    "type": "assistant/message",
    "time": 1721404001240,
    "seq": 906,
    "data": {
      "content": [
        { "type": "text", "text": "Subagent removed one unused export (legacyHelper). Typecheck passed." }
      ],
      "usage": { "inputTokens": 560, "outputTokens": 24 }
    }
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    "type": "step/end",
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    "data": { "turn": 9, "step": 0 }
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    "type": "turn/end",
    "time": 1721404001320,
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    "data": { "turn": 9, "reason": { "kind": "stop" } }
  }
]