{
  "_note": [
    "Real wire shape observed on the default profile (stdio-deepseek) when the",
    "model calls fs.edit. Captured 2026-07-18 during lane-showcase 12/12 verify.",
    "Origin: agent-loop packages/core/agent-loop/src/loop.ts persists the tool's",
    "raw execute() meta on the tool/result event — see edit.ts:92-96 in",
    "packages/fs/tool-fs. The `presentResult()` view (which would add card:'diff')",
    "is a display-time callback the runtime never invokes. Until the runtime seam",
    "emits the presented view, the renderer must infer the card from this shape.",
    "This fixture is a shape lock: if the wire ever gains card:'diff', the",
    "downstream test still passes via the primary dispatch branch; if the wire",
    "loses the diffs array, the fallback fails loudly."
  ],
  "toolCall": {
    "type": "tool/call",
    "seq": 4,
    "data": {
      "callId": "fixture_call_fs_edit_1",
      "name": "fs.edit",
      "arguments": "{\"file_path\":\"/tmp/dsh-showcase/seed-3lines.txt\",\"old_string\":\"line B\",\"new_string\":\"line B (edited)\"}"
    }
  },
  "toolResult": {
    "type": "tool/result",
    "seq": 5,
    "data": {
      "callId": "fixture_call_fs_edit_1",
      "content": [
        { "type": "text", "text": "Edited /tmp/dsh-showcase/seed-3lines.txt (1 replacement)" }
      ],
      "isError": false,
      "meta": {
        "diffs": [
          {
            "path": "/tmp/dsh-showcase/seed-3lines.txt",
            "oldText": "line A\nline B\nline C\n",
            "newText": "line A\nline B (edited)\nline C\n"
          }
        ]
      }
    }
  }
}