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.
npx skills add szweibel/claude-skills --skill xlsxgit clone --depth 1 https://github.com/szweibel/claude-skillsWrote 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.
[](https://agentmods.dev/skills/szweibel/claude-skills/xlsx)<a href="https://agentmods.dev/skills/szweibel/claude-skills/xlsx"><img src="https://agentmods.dev/badge/skills/szweibel/claude-skills/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.
<a href="https://agentmods.dev/skills/szweibel/claude-skills/xlsx"><img src="https://agentmods.dev/badge/skills/szweibel/claude-skills/xlsx.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.02666 |
| Opus 5 | $0.00048 | $0.01333 |
| Sonnet 5 | $0.00019 | $0.00533 |
| Haiku 4.5 | $0.00010 | $0.00267 |
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 11d ago.
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.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
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.
- 11d ago First seen · 290 lines · 96 tokens per session scan A 1eaf52145adb
xlsx is a skill published in the GitHub repository szweibel/claude-skills (2 stars, last pushed 7mo ago), with no licence file. It adds 96 tokens to every session and 2,666 once invoked, about $0.0005 per session on Opus 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.
Other skills, from other repositories
sn-da-excel-workflow
A step-by-step workflow for analysing Excel workbooks with multiple sheets. It covers reading data, cleaning it, filtering and combining results, and exporting reports, with a separate strategy for large files.
sn-da-large-file-analysis
A workflow for analyzing very large Excel datasets, especially files with at least 10,000 rows. It uses lower-memory reading, streaming through rows, splitting work into chunks, and converting data to Parquet, a column-based data format suited to repeated analysis.
category-filtering-and-difficulty-analysis
A workflow for grouping Excel records into categories and analyzing them across several measures, including text length and terminology density.
excel-multi-sheet-dynamic-analysis
A workflow for analyzing Excel workbooks with multiple sheets by finding relevant headers and fields, cleaning data, comparing sheets, and creating visual summaries.
large-file-conditional-formatting
An Excel analysis step that counts rows, calculates average values for a selected entity over time, and creates a styled report with color-based formatting. It can switch to Parquet, a column-based data format, for larger files.
pie-chart-data-analysis
A data-analysis workflow for pie charts that reads CSV or Excel files, counts rows across worksheets, and identifies category and numeric columns using built-in rules.