{
  "method": "sessionUpdate",
  "args": [
    {
      "sessionId": "test-session-id",
      "update": {
        "sessionUpdate": "tool_call",
        "toolCallId": "image-generation-completed-only",
        "kind": "other",
        "title": "Image generation",
        "status": "completed",
        "content": [
          {
            "type": "content",
            "content": {
              "type": "image",
              "data": "iVBORw0KGgo=",
              "mimeType": "image/png"
            }
          }
        ],
        "rawOutput": {
          "status": "generating",
          "revisedPrompt": null,
          "result": "iVBORw0KGgo="
        }
      }
    }
  ]
}