A spreadsheet tool for creating, reading, editing, analysing, and visualising files such as Excel workbooks and CSV files.

Creating spreadsheets, analysing data, applying formulas and formatting, and working with XLSX, XLSM, CSV, and TSV files.

It reduces the manual work involved in changing spreadsheet data, formulas, formatting, and charts.

How MUmerRazzaq/claude-code-skills-lab configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to MUmerRazzaq/claude-code-skills-lab. 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/MUmerRazzaq/claude-code-skills-lab/master/.claude/skills/prebuilt/xlsx/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/MUmerRazzaq/claude-code-skills-lab

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/mumerrazzaq/claude-code-skills-lab/xlsx/github.svg)](https://agentmods.dev/skills/mumerrazzaq/claude-code-skills-lab/xlsx)

Your own site

<a href="https://agentmods.dev/skills/mumerrazzaq/claude-code-skills-lab/xlsx"><img src="https://agentmods.dev/badge/skills/mumerrazzaq/claude-code-skills-lab/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/mumerrazzaq/claude-code-skills-lab/xlsx"><img src="https://agentmods.dev/badge/skills/mumerrazzaq/claude-code-skills-lab/xlsx.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 96 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,667 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 unknown No closer match found 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	$0.00096	$0.02667
Opus 5.5	$0.00038	$0.01067
Sonnet 5.5	$0.00019	$0.00533
Haiku 4.5	$0.00010	$0.00267

Measured 2mo ago against content hash 020ccdb59322, 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 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (recalc.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.

.claude/skills/prebuilt/xlsx/SKILL.md · 289 lines

The source is not reproduced here

No licence file

Read it on GitHub

Files

What ships with it

2 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.

2mo ago First seen · 289 lines · 96 tokens per session scan A 020ccdb59322

Subscribe to this mod's changes

xlsx is a skill published in the GitHub repository MUmerRazzaq/claude-code-skills-lab (5 stars, last pushed 10mo ago), with no licence file. It adds 96 tokens to every session and 2,667 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Analytics and metrics Documents Spreadsheets

xlsx next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
xlsxMUmerRazzaq/claude-code-skills-lab	Skill	5	10mo ago	none	A	96	Claude Code
dcf-modelNousResearch/hermes-agent	Skill	261k	today	MIT	A	14	Claude Code, Codex
gogopenclaw/openclaw	Skill	394k	today	MIT	A	20	Claude Code, Codex
xlsxasgeirtj/system_prompts_leaks	Skill	71k	today	CC0-1.0	A	206	Claude Code, Codex
audit-xlsanthropics/financial-services	Skill	41k	10d ago	Apache-2.0	A	104	Claude Code
artifact-template-analytics-dashboardasgeirtj/system_prompts_leaks	Skill	71k	today	CC0-1.0	A	47	Claude Code, Codex
google-drive-sheetsyc-software/qm	Skill	16k	today	MIT	A	32	Claude Code, Codex

claude-code-skills-lab: Skill for Claude Code