xlsx skillA

This file is byte-identical to the first copy the registry indexed, one of 6 copies on public GitHub. Same content hash, same audit grade.

xlsx is agent-read markdown (skill) from chancegraff/rules-for-claude: Use this skill any time a spreadsheet file is the primary input or output. This means any task where the user wants to: open, read, edit, or fix an existing .xlsx, .xlsm, .xltx, .csv, or .tsv file (e.g., adding columns, computing formulas, formatting, charting, cleaning messy data); create a new spreadsheet from scratch or from other data sources; or convert between tabular file formats. Trigger especially when the user references a spreadsheet file by name or path — even casually (like "the xls.

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

What the file says

# XLSX creation, editing, and analysis

| Task | Approach |
|---|---|
| **Create** or **edit** with formulas/formatting | `openpyxl` — see gotchas below |
| **Bulk data** in or out | `pandas` (`read_excel`, `to_excel`) |
| **Quick look** at a sheet | `markitdown file.xlsx` — `## SheetName` per sheet; reads `.xlsm` too. No cell coordinates, so don't plan edits from it |
| **Read** a model (formulas *and* values) | two `load_workbook` passes — see gotchas |

> `openpyxl`, `pandas`, and `markitdown` are preinstalled — do not run `pip install` first; write the script and import directly. Only if an import fails (or the `markitdown` command is missing): `pip install` the missing package.

> Script paths below are relative to this skill's directory.

## Requirements for every output

- **Professional font** (Arial, Times New Roman) throughout, unless the user says otherwise.
- **Zero formula errors.** Never ship while `recalc.py` reports `errors_found`. If you think an error predates you, prove it: load the *original* with `data_only=True` and look at that cell. An error you introduced looks exactly like one you inherited.
…

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How to install

mdr add chancegraff/rules-for-claude/xlsx@git:20260921.64add91

mdr add chancegraff/rules-for-claude/xlsx@sha256:6712b39718fe8150

[![mdr](https://markdownregistry.com/badge/art_sg6oaeaom5fgadcp.svg)](https://markdownregistry.com/a/art_sg6oaeaom5fgadcp)

Versions

Audit of the latest version

Source

API

GET https://markdownregistry.com/api/v1/artifacts/art_sg6oaeaom5fgadcp
GET https://markdownregistry.com/api/v1/resolve?ref=chancegraff/rules-for-claude/xlsx
GET https://markdownregistry.com/api/v1/blob/6712b39718fe815054abca9c3ee72f989613e6f771c8a5c58f30a65a6c905622

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