{
  "checker": {
    "details": {
      "argv": [
        "/tmp/jse/bin/jupyter",
        "nbconvert",
        "--to",
        "notebook",
        "--execute",
        "/workspace/binder/demo.ipynb",
        "--output",
        "/tmp/demo-probe-out.ipynb"
      ],
      "kind": "cli",
      "needs_browser": false,
      "needs_credentials": false,
      "returncode": 0,
      "scope": "product operation",
      "stderr": "[NbConvertApp] Converting notebook /workspace/binder/demo.ipynb to notebook\n/tmp/jse/lib/python3.12/site-packages/nbformat/validator.py:434: MissingIDFieldWarning: Cell is missing an id field, this will become a hard error in future nbformat versions. You may want to use `normalize()` on your notebooks before validations (available since nbformat 5.1.4). Previous versions of nbformat are fixing this issue transparently, and will stop doing so in the future.\n  _validate(nbdict, ref, version, version_minor, relax_add_props)\n[IPKernelApp] WARNING | Kernel is running over TCP without encryption. All communication (including code and outputs) is sent in plain text and is susceptible to eavesdropping. Use IPC transport or launch with kernel manager-provisioned CurveZMQ keys to enable transport encryption.\n[NbConvertApp] Writing 718404 bytes to /tmp/demo-probe-out.ipynb",
      "stdout": "",
      "working": true
    },
    "status": "PASS"
  },
  "deviations": [
    "README 'pip install jupyter-storage-explorer' was run from the pinned local checkout (/workspace) instead of PyPI, since the task pins the commit. Failed first with setuptools-scm: 'unable to detect version' because /workspace has no .git; fixed by SETUPTOOLS_SCM_PRETEND_VERSION=0.0.0.dev0 (environment variable only, no source edits).",
    "Guest had no python3-venv; installed via apt-get.",
    "Notebook execution failed first with ModuleNotFoundError: openpyxl and then FileNotFoundError for /root/.demo-data/sales-lake/curated/orders.parquet; installed openpyxl and generated the demo data with docs/scripts/demo_data.py (documented in docs/scripts/README.md and binder/start). The notebook was then run with nbconvert, not via the README's Quick start snippets.",
    "Probe is a headless notebook execution of the Binder demo (a README-linked demo), not a README code snippet verbatim: the README gives no CLI, so it has no runnable command of its own.",
    "First verification run of the probe failed with ModuleNotFoundError: demo_data because I did not pass PYTHONPATH/JSE_DEMO_DATA in that shell call (each call starts a new shell). Re-ran with the probe env: rc=0. This was my invocation error, not a product bug."
  ],
  "main_blocker": null,
  "operation": "Executed the Binder demo notebook binder/demo.ipynb headlessly with jupyter nbconvert --execute: StorageExplorer over the demo sales lake (memory fs), DataExplorer over orders.parquet, and the linked chart cells. 5 code cells, 0 error outputs, 7 widget outputs.",
  "operation_scope": "Covers the notebook's widget rendering via a headless kernel, not an interactive browser session. No browser was used. The shared CDP endpoint was not needed. Repository's unit/lint suites were not run, per task instructions.",
  "outcome": "working",
  "steps": [
    "Read README.md (Installation: pip install jupyter-storage-explorer; Requirements: Python 3.11+).",
    "apt-get install python3-venv (guest had python3 only).",
    "python3 -m venv /tmp/jse; export SETUPTOOLS_SCM_PRETEND_VERSION=0.0.0.dev0; /tmp/jse/bin/pip install /workspace jupyterlab polars nbconvert nbclient ipykernel",
    "/tmp/jse/bin/pip install matplotlib ipywidgets polars deltalake pyarrow openpyxl",
    "PYTHONPATH=/workspace/docs/scripts /tmp/jse/bin/python docs/scripts/demo_data.py /root/.demo-data (generates the demo lake that binder/start expects at $HOME/.demo-data)",
    "PYTHONPATH=/workspace/docs/scripts JSE_DEMO_DATA=/root/.demo-data /tmp/jse/bin/jupyter nbconvert --to notebook --execute binder/demo.ipynb --output /tmp/demo-executed.ipynb (rc=0)"
  ],
  "stuck_step": null,
  "suggested_fix": null
}