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xlsx

xlsx is a skill for Claude Code from synthetic-sciences/openscience. It costs 94 tokens per session (2,184 once invoked), scanned A, a copy of xlsx, Apache-2.0.

A tool for creating, editing, analysing, and converting Excel workbooks and other spreadsheet files. Excel workbooks are files containing tables, formulas, formatting, and often multiple sheets.

In plain words
What is it for?
Use it for Excel models, formulas, formatting, multi-sheet files, financial models, and CSV or TSV data that needs spreadsheet output.
Why use it?
It avoids treating spreadsheet work as plain text, so formulas, formatting, and workbook structure can be handled directly. It can also clean tabular data and produce spreadsheet output.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

not rated 4.0krepo +43 3d ago A scan 94 tokens copy · 83% Apache-2.0

Good fit Use it for Excel models, formulas, formatting, multi-sheet files, financial models, and CSV or TSV data that needs spreadsheet output.

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Install with agentmods
npx agentmods add skills/synthetic-sciences/openscience/xlsx
View source ↗ synthetic-sciences/openscience openscience.sh
About the project

synthetic-sciences/openscience is an AI workbench that carries out scientific research by reading papers, forming hypotheses, writing and running code, conducting experiments, analyzing results, and preparing reports. Researchers use it for work in machine learning, biology, physics, and chemistry with remote or local models. Catalogue add-ons extend its scientific workflows through skills and instructions.

synthetic-sciences/openscience · 4,004 stars · on GitHub · openscience.sh

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add synthetic-sciences/openscience --skill xlsx
Clone the repo
git clone --depth 1 https://github.com/synthetic-sciences/openscience

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for xlsx

README.md
[![agentmods](https://agentmods.dev/badge/skills/synthetic-sciences/openscience/xlsx/github.svg)](https://agentmods.dev/skills/synthetic-sciences/openscience/xlsx)
Your own site
<a href="https://agentmods.dev/skills/synthetic-sciences/openscience/xlsx"><img src="https://agentmods.dev/badge/skills/synthetic-sciences/openscience/xlsx/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for xlsx

Your own site · 80×15
<a href="https://agentmods.dev/skills/synthetic-sciences/openscience/xlsx"><img src="https://agentmods.dev/badge/skills/synthetic-sciences/openscience/xlsx.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 94 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,184 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 83% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00094 $0.02184
Opus 5.5 $0.00038 $0.00874
Sonnet 5.5 $0.00019 $0.00437
Haiku 4.5 $0.00009 $0.00218

Measured 1mo ago against content hash 2f4f2d898620, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

xlsx scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

The scan reads SKILL.md. This mod also ships 12 executable files (scripts/office/helpers/__init__.py, scripts/office/helpers/pptx_chart.py, scripts/office/helpers/pptx_slide.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

83% identical to xlsx — 17 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

backend/cli/skills/document-parsing/xlsx/SKILL.md · 113 lines

How it starts

The opening of the file, as written. The whole thing — 113 lines — stays where its author put it; the contents beside it link to each section on GitHub.

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 uv pip install first; write the script and import directly. Only if an import fails (or the markitdown command is missing): uv 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.
  • Use formulas, never hardcoded results. Write sheet['B10'] = '=SUM(B2:B9)', not the Python-computed total. The sheet must recalculate when its inputs change.
  • Follow the user's spec literally. Exact tab names, exact column headers, and the formula they spelled out. A redesign that computes something else fails, however elegant.
  • Document every assumption and hardcoded number where the reader will see it — a cell comment, or an adjacent cell at a table's end. Cite a real source when one exists (Source: Company 10-K, FY2024, Page 45, Revenue Note, [SEC EDGAR URL]); when the number came from the user, say so plainly.
  • A workbook you create for someone to fill in needs a short legend naming which cells to edit, and one example row of realistic values showing the expected format. Never add such a row to a file you were asked to edit.
  • Editing an existing file: match its conventions exactly. They override every guideline here. Find its designated input cells first — a distinct font color, fill, or shading marks them — write only there, and leave every existing formula untouched.

Read the full file on GitHub · 113 lines

Files

What ships with it

52 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 113 lines · 94 tokens per session scan A 2f4f2d898620

Subscribe to this mod's changes

xlsx is a skill published in the GitHub repository synthetic-sciences/openscience (4,004 stars, last pushed 3d ago), licensed Apache-2.0. It adds 94 tokens to every session and 2,184 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 83% identical to xlsx, differing in 17 lines, and is treated as a copy.

DocumentsLLMSpreadsheetsagentaibunclidocument-parsingml
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