📦

xlsx

Name: xlsx
Author: sickn33

Content revision r1 High Risk ⚙️ External commands🌐 Network access📁 Filesystem access

Create Reliable Excel Workbooks

Spreadsheet work often breaks when formulas, formatting, or template conventions are changed manually. This skill guides Claude, Codex, and Claude Code through structured XLSX creation, editing, analysis, and formula validation.

Supports: Claude Codex Code(CC)

⚠️ 38 Poor

This skill is part of a pack

Install the whole pack to get every skill the task needs, in one command.

Monthly Sales Excel Workbook · 3 skills Install whole pack

Stop for confirmation before installing.

Review the plan and obtain explicit user consent before changing files.

Install with my Agent

Copy this request to your Agent. It includes the canonical Skill page and manifest.

Agent request

Review the Skillstore skill "xlsx" from https://skillstore.io/skills/sickn33-xlsx.md and its manifest at https://skillstore.io/api/skills/sickn33-xlsx/manifest. Verify the artifact. Stop and obtain explicit user consent before installing or changing files.

Your Agent should still show its plan and request any confirmation required by the security policy.

Agent-readable resources

Use these links when an AI agent, crawler, or script needs clean context instead of reading the full page.

Markdown detail GET /skills/sickn33-xlsx.md Signed manifest GET /api/skills/sickn33-xlsx/manifest Signed lockfile GET /api/skills/sickn33-xlsx/lockfile

Test it

Using "xlsx". Create a sales summary workbook from quarterly revenue data.

Expected outcome:

A workbook with raw data, a summary sheet, quarterly totals, annual totals, and formatted currency values.

Using "xlsx". Check this model for formula errors after adding a new region.

Expected outcome:

A validation report listing affected sheets, error types, cell locations, and recommended fixes.

Using "xlsx". Convert a CSV export into a formatted Excel tracker.

Expected outcome:

A clean workbook with typed columns, filters, totals, and consistent date and number formats.

Security Audit

High Risk

v5 • 7/7/2026 Open versioned report

Most markdown backtick and system reconnaissance detections are false positives from examples and inline documentation. The material issue is recalc.py, which installs a persistent LibreOffice Basic macro in the user profile and the skill instructs users to run it for recalculation. No prompt injection text or data exfiltration intent was found in the reviewed files.

Files scanned

498

Lines analyzed

Review items

False positives ignored

Confirmed security concerns (1)

High

recalc.py:16-47

Persistent LibreOffice Macro Installation

The recalculation helper creates or uses the LibreOffice user Basic macro directory and writes Module1.xba into it. This persists application-level macro code outside the workbook being processed.

The setup function computes a LibreOffice profile macro path, creates the directory, and writes macro content. The behavior is explicit and not merely inferred from a weak keyword match.

Capability review items (9)

These are real local capabilities that may be expected for this skill, so they require review but are not counted as confirmed malicious behavior.

High

recalc.py:21

Hidden file in home directory

macro_dir = os.path.expanduser('~/.config/libreoffice/4/user/basic/Standard')

The script targets ~/.config/libreoffice under the user home directory. This is a persistent hidden application profile location outside the requested spreadsheet file.

High

recalc.py:21

Hidden file access

macro_dir = os.path.expanduser('~/.config/libreoffice/4/user/basic/Standard')

The script accesses the hidden LibreOffice profile path before installing or checking a macro. Hidden profile access is material because it can alter future LibreOffice behavior.

High

recalc.py:46

Python file write/append

with open(macro_file, 'w') as f:

The script writes Module1.xba into the LibreOffice macro directory. Writing a macro into user application configuration is a persistent side effect that should require clear disclosure or isolation.

High

recalc.py:33

Python os file operations

os.makedirs(macro_dir, exist_ok=True)

The script creates the hidden LibreOffice macro directory in the user profile when it is missing. This filesystem operation supports a persistent macro installation outside the workbook.

Medium

SKILL.md:71

Ruby/shell backtick execution

**LibreOffice Required for Formula Recalculation**: You can assume LibreOffice is installed for reca

This line instructs users to rely on recalc.py and states that it automatically configures LibreOffice. That instruction leads to execution of the bundled script with persistent profile side effects.

Medium

SKILL.md:135-137

Ruby/shell backtick execution

```bash

The cited bash block instructs running python recalc.py against a workbook. That executes the bundled recalculation script, which writes to the LibreOffice user profile.

Medium

SKILL.md:206-208

Ruby/shell backtick execution

Excel files created or modified by openpyxl contain formulas as strings but not calculated values. U

This prose tells users to use the provided recalc.py script for formula recalculation. The script has persistent LibreOffice profile side effects, so the instruction is security-relevant.

Medium

SKILL.md:208-210

Ruby/shell backtick execution

```bash

The bash block shows direct execution of python recalc.py with user-supplied workbook arguments. The command executes local script behavior that modifies LibreOffice configuration.

Medium

SKILL.md:213-215

Ruby/shell backtick execution

```bash

The example bash block again instructs running python recalc.py output.xlsx 30. This is intended script execution with persistent LibreOffice macro setup.

Audited by: codex View Audit History →

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Academic citations (APA · BibTeX · CFF)

APA citation

sickn33. (2026). xlsx security audit report (audit version 5) [Author version unspecified]. Skillstore. https://skillstore.io/skills/sickn33-xlsx/audits/5

BibTeX citation

@techreport{sickn33-sickn33-xlsx-2026,
  author = {sickn33},
  title = {xlsx security audit report (audit version 5)},
  institution = {Skillstore},
  year = {2026},
  number = {5},
  url = {https://skillstore.io/skills/sickn33-xlsx/audits/5},
  note = {Author version unspecified}
}

CITATION.cff

cff-version: 1.2.0
message: "If you use this Skill, cite its author and this versioned security audit report."
title: "xlsx security audit report (audit version 5)"
version: "unspecified"
type: report
authors:
  - name: "sickn33"
date-released: "2026-07-07"
url: "https://skillstore.io/skills/sickn33-xlsx/audits/5"
identifiers:
  - type: other
    value: "skillstore:sickn33-xlsx:audit:5"
    description: "Skillstore immutable audit report identifier"

Compare variants

11 installable variants

Each author remains a separate installable skill. The recommended variant is ranked by Skillstore evidence.

Why this variant is first

Highest Skillstore Score

Author / source Skillstore Score Evidence Confidence Skillstore usage Updated

AutumnsGrove Recommended

autumnsgrove-xlsx

Skillstore Score 84

Evidence Confidence High

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Updated

2026-08-21

ZhanlinCui

zhanlincui-xlsx

Skillstore Score 78

Evidence Confidence High

Skillstore usage 503

Updated

2026-08-21

Cam10001110101

cam10001110101-xlsx

Skillstore Score 78

Evidence Confidence High

Skillstore usage 9

Updated

2026-08-21

K-Dense-AI

k-dense-ai-xlsx

Skillstore Score 50

Evidence Confidence High

Skillstore usage 12

Updated

2026-08-21

anthropics

xlsx

Skillstore Score 38

Evidence Confidence High

Skillstore usage 158

Updated

2026-08-21

sickn33 Current

sickn33-xlsx

Skillstore Score 38

Evidence Confidence Medium

Skillstore usage 68

Updated

2026-08-21

ArtemisAI

artemisai-xlsx

Skillstore Score 38

Evidence Confidence Medium

Skillstore usage 50

Updated

2026-08-21

Azeem-2

azeem-2-xlsx

Skillstore Score 38

Evidence Confidence Medium

Skillstore usage 16

Updated

2026-08-21

davila7

davila7-xlsx

Skillstore Score 38

Evidence Confidence Medium

Skillstore usage 14

Updated

2026-08-21

ComposioHQ

composiohq-xlsx

Skillstore Score 38

Evidence Confidence Medium

Skillstore usage 12

Updated

2026-08-21

DYAI2025

dyai2025-xlsx

Skillstore Score 38

Evidence Confidence Medium

Skillstore usage 8

Updated

2026-08-21

Skillstore Score

Why this score Evidence Confidence: Medium

Architecture

Maintainability

Content

Community

Spec Compliance

What You Can Build

Build Financial Models

Create forecast workbooks with formulas, assumptions, formatting, and source notes.

Clean Spreadsheet Data

Read Excel or CSV files, inspect sheets, summarize fields, and export cleaned workbooks.

Validate Formula Updates

Modify a template, recalculate formulas, and identify cells with Excel errors.

Try These Prompts

Create a Simple Workbook

Create an XLSX workbook with one sheet for monthly expenses. Include category, date, amount, and a total formula.

Analyze an Uploaded File

Review this spreadsheet, summarize each sheet, identify missing values, and create a cleaned workbook with the same key columns.

Update a Template Safely

Update this workbook with the new assumptions. Preserve existing formulas, styles, sheet names, and number formats.

Build and Validate a Model

Build a three-year revenue model with assumption cells, linked formulas, source notes, formatting, and formula error validation.

Best Practices

Use Excel formulas for calculated values so workbooks remain editable and dynamic.
Preserve existing workbook conventions before adding new formatting or sheets.
Run formula recalculation and review reported error cells before delivery.

Avoid

Do not replace formulas with static calculated values unless the user requests it.
Do not save a formula workbook after loading it with calculated values only.
Do not change established template styling without checking the existing pattern first.

Frequently Asked Questions

What file types does this skill support?

It focuses on Excel workbooks and spreadsheet data, including XLSX, XLSM, CSV, and TSV files.

Can it preserve formulas in existing workbooks?

Yes. It recommends openpyxl workflows that preserve formulas while editing cells, sheets, and formatting.

Does it calculate formula results itself?

No. It uses LibreOffice through recalc.py to recalculate workbook formulas after changes.

Does the recalculation script change system files?

It writes a LibreOffice Basic macro into the user LibreOffice profile to perform recalculation.

Is it suitable for financial models?

Yes. It includes guidance for assumptions, source notes, colors, formats, and formula checks.

Can it guarantee that workbook data is correct?

No. It can validate formulas and structure, but source data accuracy depends on user-provided inputs.

Developer Details

Author

sickn33

License

Proprietary. LICENSE.txt has complete terms

Skillstore revision

Version notice

The author did not declare a version.

Repository

https://github.com/sickn33/antigravity-awesome-skills/tree/main/web-app/public/skills/xlsx-official

Ref

f93e9bb0daca99badb6a7e574b97737155d57cb3

Maintenance freshness

7/18/2026

Usage

62 downloads · 156 views

File structure

📄 LICENSE.txt

📄 recalc.py

📄 SKILL.md

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xlsx

Install with my Agent

Agent-readable resources

Test it

Security Audit

Confirmed security concerns (1)

Risk Factors

Copy report link

Markdown badge

HTML badge

Embed card

APA citation

BibTeX citation

CITATION.cff

Compare variants

Skillstore Score

What You Can Build

Build Financial Models

Clean Spreadsheet Data

Validate Formula Updates

Try These Prompts

Best Practices

Avoid

Frequently Asked Questions

Developer Details

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