{
  "context": "Evaluates how well the solution uses Python 3.13 standard library filesystem and file I/O APIs to walk directories, filter eligible log files, count their lines, and write the required report. Checks whether the implementation leans on pathlib/os utilities, standard file handles, and encoding-aware reads/writes that align with the spec.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "Recursive walk",
      "description": "Traverses the tree under source_dir with pathlib.Path.rglob or os.walk and builds forward-slash relative paths via Path.relative_to or os.path.relpath instead of manual string concatenation.",
      "max_score": 20
    },
    {
      "name": "Hidden skip",
      "description": "Skips files and directories whose names start with '.' using Path.name checks or os.path.basename before descending or processing.",
      "max_score": 15
    },
    {
      "name": "Extension filter",
      "description": "Filters candidates case-insensitively with Path.suffix (or os.path.splitext) against the provided extensions list before reading.",
      "max_score": 15
    },
    {
      "name": "Size guard",
      "description": "Uses Path.stat().st_size or os.path.getsize to exclude files whose byte size exceeds max_bytes without reading their contents.",
      "max_score": 15
    },
    {
      "name": "Line counting",
      "description": "Reads matching files in text mode with open(..., encoding='utf-8') and counts newline-separated lines (including empties) using standard library helpers like str.splitlines or iteration over the file handle.",
      "max_score": 15
    },
    {
      "name": "Report writing",
      "description": "Ensures the parent directory exists via Path(output_file).parent.mkdir(parents=True, exist_ok=True) or os.makedirs before writing the UTF-8 CSV with open(..., encoding='utf-8'), including the header and sorted path,count rows with a trailing newline.",
      "max_score": 20
    }
  ]
}