A set of instructions and tools for creating, editing, checking, and converting Excel workbooks and other spreadsheet files. It covers formulas, formatting, multiple sheets, financial models, and tabular data cleanup.

Use it to build or modify .xlsx, .xlsm, and related spreadsheet files, import or export tables, inspect formulas and values, and check for formula errors.

Spreadsheet work can introduce broken formulas, inconsistent formatting, or hardcoded results that are difficult to notice before delivery.

How K-Dense-AI/claude-scientific-writer configures Claude Code

About the project

Claude Scientific Writer is an AI-assisted research and writing tool that searches literature and produces documents such as scientific papers, reports, posters, grant proposals, and reviews with citations. Researchers and technical writers can use it as a Claude Code plugin, Python package, or command-line tool, with the catalogue entries defining agent workflows for it.

K-Dense-AI/claude-scientific-writer · 2,327 stars · on GitHub · k-dense.ai

Reuse

Borrowing it

Nothing to install: this file belongs to K-Dense-AI/claude-scientific-writer. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/K-Dense-AI/claude-scientific-writer/main/.claude/skills/xlsx/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/K-Dense-AI/claude-scientific-writer

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/k-dense-ai/claude-scientific-writer/xlsx/github.svg)](https://agentmods.dev/skills/k-dense-ai/claude-scientific-writer/xlsx)

Your own site

<a href="https://agentmods.dev/skills/k-dense-ai/claude-scientific-writer/xlsx"><img src="https://agentmods.dev/badge/skills/k-dense-ai/claude-scientific-writer/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/k-dense-ai/claude-scientific-writer/xlsx"><img src="https://agentmods.dev/badge/skills/k-dense-ai/claude-scientific-writer/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 2,161 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 97% 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.

Model	Per session	Once invoked
Fable 5.1	$0.00094	$0.02161
Opus 5	$0.00047	$0.01081
Sonnet 5	$0.00019	$0.00432
Haiku 4.5	$0.00009	$0.00216

Measured 12d ago against content hash 9bb0521b9b1c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, 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 12d 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

97% identical to xlsx — 4 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.

.claude/skills/xlsx/SKILL.md · 111 lines

How it starts

The opening of the file, as written. The whole thing — 111 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 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.
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 · 111 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.

12d ago First seen · 111 lines · 94 tokens per session scan A 9bb0521b9b1c

Subscribe to this mod's changes

xlsx is a skill published in the GitHub repository K-Dense-AI/claude-scientific-writer (2,327 stars, last pushed 24d ago), licensed MIT. It adds 94 tokens to every session and 2,161 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. It is 97% identical to xlsx, differing in 4 lines, and is treated as a copy.

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claude-scientific-writer: Skill for Claude Code

Borrowing it

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

This is a copy

How it starts

XLSX creation, editing, and analysis

Requirements for every output

What ships with it

What this file has done since we first saw it

Other skills, from other repositories

document-processing-expert

xlsx

xlsx

xlsx

dcf-model

comps-analysis