This file is byte-identical to the first copy the registry indexed, one of 8 indexed copies. Same content hash, so the same checks give both the same grade.
xlsx from chancegraff/rules-for-claude is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
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…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file 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.
…
The line at the top of this page pins the label git:20260921.64add91, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
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
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
chancegraff/rules-for-claude · skills/.trash/1791476949858-90017-8U3l3E/chrome-browser/SKILL.md · Read this skill before the first step that uses Claude in Chrome, the browser extension whose tools are named…
chancegraff/rules-for-claude · skills/.trash/1791476949858-90017-e5Fpv6/deep-research/SKILL.md · Use this skill when the user's prompt requires (1) researching a topic across multiple sources, comparing options or…
chancegraff/rules-for-claude · skills/.trash/1791476949858-90017-lm8aJU/computer-use/SKILL.md · Read this skill before the first step of any request to do something in an app on the person's own computer (Notes…
chancegraff/rules-for-claude · skills/.trash/1791476949858-90017-m7b5bh/built-in-browser/SKILL.md · Read this skill before the first step that uses the built-in browser, the browser pane inside the Claude desktop app…
chancegraff/rules-for-claude · skills/jira-ticket-workflow/SKILL.md · End-to-end Jira ticket workflow that manages a cross-functional team of agents to plan, implement, review, and ship…
chancegraff/rules-for-claude · skills/pr-review-response/SKILL.md · End-to-end workflow for responding to PR review feedback. Reads all review comments and requested changes on the…
chancegraff/rules-for-claude · skills/pr-review/SKILL.md · How to answer review feedback on a pull request. Load when a bot or human reviewer leaves findings, when the base…
chancegraff/rules-for-claude · skills/synced/b274f0e7-ba7f-4b80-9128-3c20a62a5a94_fb1313aa-c023-436b-bd7f-af7178660a2a/attentive-brand-artifacts/SKILL.md · Use when creating or editing Attentive-branded artifacts, React components, HTML pages, Sandpack themes, decks, docs…
chancegraff/rules-for-claude · skills/synced/b274f0e7-ba7f-4b80-9128-3c20a62a5a94_fb1313aa-c023-436b-bd7f-af7178660a2a/attentive-pixel-perfect-slides/SKILL.md · Use when creating, converting, editing, or QAing Attentive PowerPoint decks with the canonical 2026 template, including…
chancegraff/rules-for-claude · skills/synced/b274f0e7-ba7f-4b80-9128-3c20a62a5a94_fb1313aa-c023-436b-bd7f-af7178660a2a/docx/SKILL.md · Use this skill whenever the user wants to create, read, edit, or manipulate Word documents (.docx) or Word templates…
anthropics/skills · skills/xlsx/SKILL.md · Use this skill any time a spreadsheet file is the primary input or output. This means any task where the user wants to…
eigent-ai/eigent · resources/example-skills/xlsx/SKILL.md · Use this skill any time a spreadsheet file is the primary input or output. This means any task where the user wants to…
thinkinaixyz/deepchat · resources/skills/xlsx/SKILL.md · Comprehensive spreadsheet creation, editing, and analysis with support for formulas, formatting, data analysis, and…
davepoon/buildwithclaude · plugins/all-skills/skills/xlsx/SKILL.md · Comprehensive spreadsheet creation, editing, and analysis with support for formulas, formatting, data analysis, and…
ginlix-ai/langalpha · plugins/langalpha_deliverables/skills/xlsx/SKILL.md · Excel workbooks with live formulas: build or edit .xlsx models with openpyxl, recalculate with IronCalc or LibreOffice…
fcakyon/claude-codex-settings · plugins/anthropic-office-skills/skills/xlsx/SKILL.md · Use this skill any time a spreadsheet file is the primary input or output. This means any task where the user wants to…
