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Agent skill

XLSX Toolkit

by borghei in borghei/Claude-Skills

Audit Microsoft Excel (.xlsx) workbooks for formula density, external references, named ranges, hidden sheets, and data validation.

MITAuto-check passedDocuments & Office

Install XLSX Toolkit

skills CLI
$ npx skills add borghei/Claude-Skills --skill xlsx-toolkit -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install borghei/Claude-Skills xlsx-toolkit --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/borghei/Claude-Skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/documents/xlsx-toolkit .claude/skills/xlsx-toolkit && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
xlsx-toolkit
GitHub stars
881
Token cost
~1.4k tokens
SKILL.md length
629 words
Files
4 (incl. scripts, references, assets)
Skills in repo
349
Repo updated
First seen
Licence
MIT

At a glance

Audit Microsoft Excel (.xlsx) workbooks for formula density, external references, named ranges, hidden sheets, and data validation.

  • Works in 5 steps: Run audit → Hidden sheets > 0 → confirm intentional… → External links > 0 → verify links point… → …
  • Reviewing a financial model
  • SKILL.md covers Table of Contents, Keywords, Clarify First and Quick Start, plus 6 more sections
  • Runs Python scripts from its folder; calls python

What it does

XLSX Toolkit is an agent skill from borghei/Claude-Skills. Audit Microsoft Excel (.xlsx) workbooks for formula density, external references, named ranges, hidden sheets, and data validation. Use when reviewing a financial model, sharing a workbook externally, or checking for data leakage.

Its SKILL.md is about 1.4k tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including scripts, reference files and assets (for example `assets/workbook_handoff_checklist.md`, `references/financial_model_audit_guide.md` and `scripts/xlsx_auditor.py`).

It sits in Documents & Office, covering Excel spreadsheets and Financial modeling. It works with Microsoft Excel. The repository describes itself as: 385 AI skills, 77 expert agents, and 900 stdlib Python tools for every team: engineering, PM, marketing, C-level, compliance, business ops, research, and a LinkedIn toolkit… The licence is MIT.

When your agent uses it

  • Reviewing a financial model
  • Sharing a workbook externally
  • Checking for data leakage

Example prompts

  • “/xlsx-toolkit”

Requirements

  • Python 3

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. Run audit
  2. Hidden sheets > 0 → confirm intentional or delete
  3. External links > 0 → verify links point to public / shared sources, not your local drive
  4. Named-range count anomalies (very high) → likely cruft from prior model versions; clean up
  5. Re-run until clean

What it can do on your machine

Read from SKILL.md and the folder at commit 4a698e8. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 1 file in scripts/ (Python), which the agent can run.

    Shell commands in SKILL.md call:

    • python

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

XLSX Toolkit loads about 1.4k tokens when it runs, and up to ~2.7k if it reads all its reference files. Until then it costs about 61 tokens; SKILL.md has 629 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~61
When it runs · the whole SKILL.md, loaded when a task matches
~1.4k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~2.7k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from borghei/Claude-Skills at commit 4a698e8, republished under its MIT licence (© borghei). 629 words, ~1,369 tokens.

Download SKILL.mdSave it as .claude/skills/xlsx-toolkit/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.
name
xlsx-toolkit
description
Audit Microsoft Excel (.xlsx) workbooks for formula density, external references, named ranges, hidden sheets, and data validation. Use when reviewing a financial model, sharing a workbook externally, or checking for data leakage.
license
MIT + Commons Clause
metadata.version
1.0.0
metadata.author
borghei
metadata.category
documents
metadata.domain
document-automation
metadata.updated
2026-05-04
metadata.python-tools
xlsx_auditor.py
metadata.tech-stack
xlsx, OOXML

Xlsx Toolkit

Audit .xlsx files using the standard library only — no openpyxl required. Reads OOXML directly via zipfile + xml.etree.

Table of Contents

Keywords

xlsx, Excel, spreadsheet, workbook, financial model, formula audit, hidden sheets, external references, named ranges, data validation

Clarify First

Before running the audit, confirm these inputs. If any is unknown or vague, ASK — do not assume:

  • Audit purpose (pre-send leak check, financial-model review, or handoff portability check) — selects the workflow and what you flag
  • Recipient context (external partner, another team, their machine) — sets the tolerance for hidden sheets and external links
  • Which sheets are inputs vs calculations (for model review) — drives where to focus formula-density reading

Stop rule: ask only the 2-3 that most change the output. If the user says "just draft it," proceed and list your assumptions at the top of the artifact.

Quick Start

bash
python scripts/xlsx_auditor.py model.xlsx

Outputs: sheet count and names, hidden-sheet count, cell count per sheet, formula count per sheet, external link count, named range count, data validation rule count.

Core Workflows

Workflow 1: Pre-Send Workbook Audit

Goal: Catch the issues that embarrass the sender — leftover hidden sheets, broken external links, unused named ranges, formulas referencing local file paths.

Steps:

  1. Run audit
  2. Hidden sheets > 0 → confirm intentional or delete
  3. External links > 0 → verify links point to public / shared sources, not your local drive
  4. Named-range count anomalies (very high) → likely cruft from prior model versions; clean up
  5. Re-run until clean

Time Estimate: 5-10 minutes per workbook.

Workflow 2: Financial Model Review

Goal: Quantify the rough complexity of a financial model before reading cell-by-cell.

Steps:

  1. Run audit; capture per-sheet cell counts and formula counts
  2. Sheets with formula density > 70% are calculation sheets; should be well-structured
  3. Sheets with formula density 0-10% are inputs; should be obviously labeled
  4. Sheets with formula density 10-70% are mixed — easiest place for errors to hide
  5. Cross-reference with references/financial_model_audit_guide.md

Time Estimate: 30-60 minutes per model audit (audit + targeted reading).

Workflow 3: Workbook Handoff Check

Goal: Ensure a workbook handed off to another team or partner won't break on their machine.

Steps:

  1. Run audit
  2. External links → re-link to shared paths (OneDrive, SharePoint, S3) or hard-code values
  3. Custom named ranges → document if recipient is expected to extend; remove if internal
  4. Macros (xlsm) → audit shows non-.xlsx extension expected; convert if recipient cannot run macros
  5. File size > 10 MB → consider splitting or removing image / chart blobs

Time Estimate: 10-20 minutes per workbook.

Show full SKILL.md (210 more words)Show less

Tools

xlsx_auditor.py

Reads a .xlsx file as a ZIP archive and parses OOXML directly.

bash
python scripts/xlsx_auditor.py model.xlsx
python scripts/xlsx_auditor.py model.xlsx --json

Reports:

  • Sheet list with name, hidden status, cell count, formula count, formula density %
  • Total cell and formula counts
  • Named ranges and their scopes
  • External link references (file paths or URLs)
  • Data validation rule count
  • File size

Limits:

  • Does not evaluate formulas. To check whether formulas are correct, use Excel itself or a financial-model-checker library.
  • Does not read cell values for non-shared-string cells beyond counting; full value extraction requires more parsing than this tool does.

Reference Guides

  • references/financial_model_audit_guide.md — Patterns for auditing financial models; common error categories; defensive structure tips

Templates

  • assets/workbook_handoff_checklist.md — Pre-send xlsx sign-off checklist

Best Practices

  • Hide internal-only sheets only when intended. If a sheet is hidden because it's WIP, delete it before sending.
  • Avoid external links across handoffs. A formula referencing 'C:\Users\you\Desktop\old-model.xlsx' is the workbook equivalent of leaving your laptop name in the document author field.
  • Name your inputs. Cells like Inputs!B7 mean nothing. Named ranges like WACC and RevenueGrowth survive structural changes.
  • One model, one purpose. Workbooks that calculate, present, and serve as a database of records always end up broken.

Integration Points

  • Pairs with finance/ skills for financial-model review
  • Pairs with c-level-advisor/cfo-advisor for board-pack workbook review
  • Used by data-analytics/ for ad-hoc analytics handoff

© borghei, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 3 other files (scripts, references, assets) in documents/xlsx-toolkit of borghei/Claude-Skills.

  • SKILL.md
  • assets/workbook_handoff_checklist.md
  • references/financial_model_audit_guide.md
  • scripts/xlsx_auditor.py

Open the folder on GitHubat commit 4a698e8

Compare with similar skills

XLSX Toolkit next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

XLSX Toolkit compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
XLSX Toolkit this skillborghei/Claude-Skills881—~1.4kAutomated safety check: PassMIT
Officecli Commonly TemplatesTeam-Commonly/commonly1.4k—~1.7kAutomated safety check: PassApache-2.0
Brigade Spreadsheet Builderspinabot/brigade11k—~1.4kAutomated safety check: PassMIT
Open-Sheet Workbook Creatorlianghsun/open-sheet127—~1.4kAutomated safety check: PassMIT
Lark Sheetsrongxinzy/RongxinAI1542 repos~5.3kAutomated safety check: PassAGPL-3.0
Officecli Data DashboardFerroxLabs/wayland6084 repos~9.2kAutomated safety check: PassAGPL-3.0

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Works with

Categories

Questions about XLSX Toolkit

What does XLSX Toolkit do?

Audit Microsoft Excel (.xlsx) workbooks for formula density, external references, named ranges, hidden sheets, and data validation. XLSX Toolkit is an agent skill from borghei/Claude-Skills.xlsx) workbooks for formula density, external references, named ranges, hidden sheets, and data validation.

When should I use XLSX Toolkit?

XLSX Toolkit fits situations like: reviewing a financial model; sharing a workbook externally; checking for data leakage.

How do I install XLSX Toolkit in Claude Code?

Run `npx skills add borghei/Claude-Skills --skill xlsx-toolkit -a claude-code`. Or copy the skill folder (documents/xlsx-toolkit in borghei/Claude-Skills) into .claude/skills/xlsx-toolkit in your project. Claude Code loads it when a task matches its description.

How do I install XLSX Toolkit in Codex?

Run `npx skills add borghei/Claude-Skills --skill xlsx-toolkit -a codex`. Or copy the skill folder (documents/xlsx-toolkit in borghei/Claude-Skills) into .agents/skills/xlsx-toolkit in your project. Codex loads it when a task matches its description.

Can I use XLSX Toolkit in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add borghei/Claude-Skills --skill xlsx-toolkit -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/xlsx-toolkit, .gemini/skills/xlsx-toolkit, .github/skills/xlsx-toolkit and .opencode/skills/xlsx-toolkit in your project.

What does XLSX Toolkit need to run?

Going by SKILL.md and its folder, XLSX Toolkit needs Python for the scripts in its folder and the command-line tools its instructions call (python). Our summary lists: Python 3.

Does XLSX Toolkit access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is XLSX Toolkit safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does XLSX Toolkit use?

XLSX Toolkit is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does XLSX Toolkit use?

About 1.4k tokens (SKILL.md is roughly 5.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.3k tokens, read only when the agent opens those files.

What are the alternatives to XLSX Toolkit?

Skills that share tags, products or a category with XLSX Toolkit: Officecli Commonly Templates (Team-Commonly/commonly, 1.4k stars), Brigade Spreadsheet Builder (spinabot/brigade, 11k stars), Open-Sheet Workbook Creator (lianghsun/open-sheet, 127 stars) and Lark Sheets (rongxinzy/RongxinAI, 154 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains XLSX Toolkit?

borghei (a GitHub user) maintains it in borghei/Claude-Skills, which has 881 GitHub stars. The repository holds 349 skills in this directory. The repository was last updated on October 7, 2026.

Source: borghei/Claude-Skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.