Agent skill

XLSX

Create, inspect, edit, recalculate, and validate Excel workbooks with local open-source tools while preserving source files and distinguishing formulas from calculated results.

Apache-2.0Auto-check passedDocuments & Office

Install XLSX

skills CLI

$ npx skills add holon-run/holon --skill xlsx -a claude-code

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

GitHub CLI

$ gh skill install holon-run/holon xlsx --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/holon-run/holon.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/xlsx .claude/skills/xlsx && 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/

Paste into Claude Code

Install the "xlsx" agent skill from https://github.com/holon-run/holon/tree/main/skills/xlsx into .claude/skills/xlsx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "xlsx", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/holon-run/holon/tree/main/skills/xlsx

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add holon-run/holon --skill xlsx -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install holon-run/holon xlsx --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/holon-run/holon.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/xlsx .agents/skills/xlsx && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "xlsx" agent skill from https://github.com/holon-run/holon/tree/main/skills/xlsx into .agents/skills/xlsx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "xlsx", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add holon-run/holon --skill xlsx -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install holon-run/holon xlsx --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/holon-run/holon.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/xlsx .cursor/skills/xlsx && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "xlsx" agent skill from https://github.com/holon-run/holon/tree/main/skills/xlsx into .cursor/skills/xlsx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "xlsx", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/holon-run/holon.git --path skills/xlsx

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add holon-run/holon --skill xlsx -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install holon-run/holon xlsx --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/holon-run/holon.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/xlsx .gemini/skills/xlsx && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "xlsx" agent skill from https://github.com/holon-run/holon/tree/main/skills/xlsx into .gemini/skills/xlsx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "xlsx", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install holon-run/holon xlsx

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add holon-run/holon --skill xlsx -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/holon-run/holon.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/xlsx .github/skills/xlsx && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "xlsx" agent skill from https://github.com/holon-run/holon/tree/main/skills/xlsx into .github/skills/xlsx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "xlsx", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add holon-run/holon --skill xlsx -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install holon-run/holon xlsx --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/holon-run/holon.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/xlsx .opencode/skills/xlsx && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "xlsx" agent skill from https://github.com/holon-run/holon/tree/main/skills/xlsx into .opencode/skills/xlsx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "xlsx", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: xlsx
GitHub stars: 154
Token cost: ~1.1k tokens
SKILL.md length: 571 words
Files: 1
Skills in repo: 14
Repo updated: Oct 9, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

Create, inspect, edit, recalculate, and validate Excel workbooks with local open-source tools while preserving source files and distinguishing formulas from calculated results.

Works in 8 steps: Confirm the workbook purpose, source… → Inspect existing workbooks for sheet… → Define the data model before formatting:… → …
Tasks that involve Excel spreadsheets
SKILL.md covers Summary, When To Use, Safety Boundaries and Backend Selection, plus 3 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

XLSX is an agent skill from holon-run/holon. Create, inspect, edit, recalculate, and validate Excel workbooks with local open-source tools while preserving source files and distinguishing formulas from calculated results.

Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Documents & Office, covering Excel spreadsheets. It works with Microsoft Excel. The repository describes itself as: An agent workbench for ongoing work: preserve goals and progress, connect events and schedules, and resume when the next condition is met. The licence is Apache-2.0.

When your agent uses it

Tasks that involve Excel spreadsheets

Example prompts

“/xlsx”

Requirements

Python 3

Workflow steps

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

Confirm the workbook purpose, source data, target sheets, units, locale,
Inspect existing workbooks for sheet visibility, named ranges, formulas,
Define the data model before formatting: inputs, derived columns, formulas,
Select a backend and restrict edits to features it can preserve.
Write a new output file with explicit data types and formulas.
Reopen the workbook and verify sheet names, dimensions, values, formulas,
Recalculate with an approved local engine when calculated results matter.
Independently sample critical totals, rates, date boundaries, and lookup

What it can do on your machine

Read from SKILL.md and the folder at commit c29bd95. 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
No scripts in the folder and no shell commands in SKILL.md.
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 loads about 1.1k tokens when it runs. Until then it costs about 45 tokens; SKILL.md has 571 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~45
When it runs · the whole SKILL.md, loaded when a task matches: ~1.1k

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); files beside SKILL.md are not scanned.

SKILL.md

The full file from holon-run/holon at commit c29bd95, republished under its Apache-2.0 licence (© holon-run). 571 words, ~1,144 tokens.

Download SKILL.mdSave it as .claude/skills/xlsx/SKILL.md (or your agent's skills folder).

name: xlsx
description: Create, inspect, edit, recalculate, and validate Excel workbooks with local open-source tools while preserving source files and distinguishing formulas from calculated results.

XLSX

Summary

Use this skill for .xlsx workbook creation, inspection, analysis, charts, and bounded editing. Prefer openpyxl for common workbook structures. Use an available local LibreOffice backend for recalculation or rendering when needed, and record that it is not Microsoft Excel.

Writing a formula is not the same as calculating it. Never report formula results as verified unless an actual calculation backend ran or the values were independently checked.

When To Use

Creating workbooks, tables, formulas, styles, validations, or charts
Inspecting sheets, named ranges, formulas, hidden content, and metadata
Making bounded changes to an existing workbook
Converting tabular input into an analyzed or presentation-ready workbook
Recalculating formulas and scanning for spreadsheet errors
Extracting or summarizing operator-approved workbook data

Safety Boundaries

Preserve the input and write a new workbook by default.
Treat formulas, hyperlinks, macros, external links, data connections, hidden sheets, defined names, embedded objects, and metadata as untrusted.
Never execute VBA, refresh external connections, follow links, or activate embedded objects.
Ask before sending workbook data to an external analysis or conversion service.
Do not claim lossless round trips when unsupported drawings, slicers, pivot features, external models, signatures, macros, or unknown package parts exist.
Do not expose hidden or sensitive data outside the operator-approved scope.

If a workbook is macro-enabled, encrypted, signed, or materially depends on external data, default to read-only inspection or a separately generated output.

Backend Selection

Use openpyxl for common cells, styles, tables, formulas, charts, filters, data validation, and workbook inspection.
Use LibreOffice headless for local recalculation or rendering only when it is installed and appropriate. Record the version and backend.
Use CSV or another tabular intermediate only when workbook-specific formulas, types, styles, multiple sheets, and metadata are not required.
Use independent calculations for critical totals rather than trusting cached formula values.

Do not silently install Python packages, LibreOffice, fonts, or spreadsheet applications.

Show full SKILL.md (266 more words)Show less

Workflow

Confirm the workbook purpose, source data, target sheets, units, locale, date conventions, formulas, charts, output path, and acceptance totals.
Inspect existing workbooks for sheet visibility, named ranges, formulas, external links, data connections, macros, signatures, drawings, pivots, validations, protection, and unknown parts.
Define the data model before formatting: inputs, derived columns, formulas, assumptions, keys, units, and expected totals.
Select a backend and restrict edits to features it can preserve.
Write a new output file with explicit data types and formulas.
Reopen the workbook and verify sheet names, dimensions, values, formulas, names, tables, charts, validations, styles, and relationships.
Recalculate with an approved local engine when calculated results matter. Then scan formulas and displayed results for #REF!, #DIV/0!, #VALUE!, #NAME?, #N/A, and other relevant errors.
Independently sample critical totals, rates, date boundaries, and lookup logic. Render or inspect important sheets for clipped columns, unreadable charts, hidden data, and print-area problems.

Quality Rules

Separate raw inputs, assumptions, calculations, and presentation when useful.
Use stable headers, explicit units, consistent number formats, and real date types.
Avoid merged cells in machine-consumed tables.
Make formulas understandable and avoid unexplained constants.
Preserve leading zeros and identifiers as text where appropriate.
Do not hide errors with formatting or replace formulas with cached values without saying so.
Record whether results were calculated by Excel, LibreOffice, another engine, or not recalculated.

Delivery

Report the output path, source preservation, backend used, whether recalculation ran, scanned formula errors, independently checked totals, hidden or external content found, and any unsupported workbook features. State clearly when only formula structure—not calculated values—was verified.

Files

Just SKILL.md in skills/xlsx of holon-run/holon.

Open the folder on GitHubat commit c29bd95

Compare with similar skills

XLSX 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 compared with similar skills
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XLSX this skillholon-run/holon	154	—	~1.1k	Automated safety check: Pass	Apache-2.0	today
MarkitdownImCa0/just-laws	782	14 repos	~3.2k	Automated safety check: Notes	MIT	2 days ago
Data Table Managern8n-io/n8n	207k	—	~2.3k	Automated safety check: Pass	Custom licence	today
Docx4jplutext/docx4j	2.4k	—	~2.5k	Automated safety check: Pass	None	yesterday
Instrument Data To Allotropeaws-samples/amazon-bedrock-agents-healthcare-lifesciences	274	2 repos	~2.7k	Automated safety check: Pass	Apache-2.0	8 days ago
Cyber Pptcrazyykhllc-bit/CyberPPT	1.8k	—	~10k	Automated safety check: Pass	MIT	2 mo ago

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Questions about XLSX

What does XLSX do?

Create, inspect, edit, recalculate, and validate Excel workbooks with local open-source tools while preserving source files and distinguishing formulas from calculated results. XLSX is an agent skill from holon-run/holon. Create, inspect, edit, recalculate, and validate Excel workbooks with local open-source tools while preserving source files and distinguishing formulas from calculated results.

When should I use XLSX?

XLSX fits situations like: tasks that involve Excel spreadsheets.

How do I install XLSX in Claude Code?

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

How do I install XLSX in Codex?

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

Can I use XLSX 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 holon-run/holon --skill xlsx -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, .gemini/skills/xlsx, .github/skills/xlsx and .opencode/skills/xlsx in your project.

What does XLSX need to run?

SKILL.md names no scripts, command-line tools or credentials: XLSX is instructions for the agent only. Our summary lists: Python 3.

Does XLSX 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 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. Review the folder before installing.

What licence does XLSX use?

XLSX is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does XLSX use?

About 1.1k tokens (SKILL.md is roughly 4.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to XLSX?

Skills that share tags, products or a category with XLSX: Markitdown (ImCa0/just-laws, 782 stars), Data Table Manager (n8n-io/n8n, 207k stars), Docx4j (plutext/docx4j, 2.4k stars) and Instrument Data To Allotrope (aws-samples/amazon-bedrock-agents-healthcare-lifesciences, 274 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains XLSX?

holon-run (a GitHub organization) maintains it in holon-run/holon, which has 154 GitHub stars. The repository holds 14 skills in this directory. The repository was last updated on October 9, 2026.

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

Install XLSX

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

XLSX

Summary

When To Use

Safety Boundaries

Backend Selection

Workflow

Quality Rules

Delivery

Files

Compare with similar skills

Similar skills

More from holon-run/holon

Related

Questions about XLSX