Japanese CSV Rescue Kit — Excel-safe cleanup

A reusable CSV cleanup skill and Python tool, not a one-off processing service. For people and AI agents handling Japanese product catalogs, spreadsheet exports and data migrations. Inspect first, then choose only the transformations you want. Included: - UTF-8/CP932/BOM-marked UTF-16 input; comma/tab/semicolon CSV - Optional whitespace trimming and full-width ASCII conversion in selected columns - Valid year-first date conversion, with ambiguous or impossible dates left for review - Exact duplicate detection; removal only when explicitly selected - UTF-8 BOM CSV + Excel-safe XLSX with every cell stored as literal text - JSON and Markdown change reports, source checksum, counts and review issues - SKILL.md agent instructions, bilingual guide, synthetic demo and 30 regression tests Python 3.10+; standard library only. No required third-party packages, paid AI API, daemon, or system setting changes. Tested on macOS; command-line Python environment required. License verification needs internet and sends only your purchased Toku key. CSV content is processed locally and is not uploaded. Your chosen AI assistant's subscription/usage limits are separate. Before buying: download the ZIP and run the bundled demo without a license. Real input requires the license issued for this product. Each clean run writes to a new folder; it does not alter your source. Limits: CSV/TSV input only; 25 MiB, 100,000 rows, 256 columns; unique non-empty headers and rectangular records. Dates and amounts in XLSX remain text, not numeric/date cells. XLSX input, semantic entity matching, web enrichment and restoration of already-lost characters/zeros are not included. Detailed logs are capped at 1,000 entries per section with full counts and a truncation flag. Purchase includes use for your own and client work. Do not resell the kit or share keys. Individual installation or data-processing services are not included. 日本語CSVの文字化け・全角英数字・日付表記・完全一致の重複を整理するキットです。元CSVを残し、新しいフォルダへCSV・Excel・変更報告を出力します。購入前に同梱サンプルを試せます。有料AI APIは不要。ライセンス照合だけインターネット接続が必要です。日付・金額も文字列として保存します。