A toolkit for creating, reading, and editing Excel workbooks and CSV files. It can work with sheets, formulas, tables, charts, formatting, and other workbook structures.

Build reports, inspect workbook contents, update cells and sheets, recalculate formulas, and convert between Excel and CSV.

It removes the need to handle spreadsheet files manually when inspecting data or making structured changes.

xlsx — Skill for Claude Code and Codex by nobodyohm-web

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 nobodyohm-web/Thot --skill xlsx

Clone the repo

git clone --depth 1 https://github.com/nobodyohm-web/Thot

Made for: Claude Code, Codex.

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/nobodyohm-web/thot/xlsx/github.svg)](https://agentmods.dev/skills/nobodyohm-web/thot/xlsx)

Your own site

<a href="https://agentmods.dev/skills/nobodyohm-web/thot/xlsx"><img src="https://agentmods.dev/badge/skills/nobodyohm-web/thot/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/nobodyohm-web/thot/xlsx"><img src="https://agentmods.dev/badge/skills/nobodyohm-web/thot/xlsx.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 16 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,581 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 100% 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	$0.00016	$0.02581
Opus 5	$0.00008	$0.01290
Sonnet 5	$0.00003	$0.00516
Haiku 4.5	$0.00002	$0.00258

Measured 5d ago against content hash b302d7ac9978, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, 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 5d ago.

The scan reads SKILL.md. This mod also ships 8 executable files (scripts/csv_to_xlsx.py, scripts/xlsx_create.py, scripts/xlsx_edit.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

100% identical to xlsx — 0 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.

hermes/skills/productivity/xlsx/SKILL.md · 197 lines

How it starts

The opening of the file, as written. The whole thing — 197 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Xlsx Skill

Work with Excel .xlsx workbooks using Python and openpyxl: build styled multi-sheet workbooks with formulas and charts, inspect or dump existing files, edit cells and structure, and convert to/from CSV. All helper scripts are argparse CLIs that print JSON and use explicit UTF-8 I/O.

When to Use

Creating .xlsx reports: multiple sheets, number formats, styling, merged cells, freeze panes, autofilter, conditional formatting, charts, data-validation dropdowns, native Excel tables, defined names, hyperlinks, cell notes, sheet protection.
Reading a workbook: sheet inventory, dumping data as JSON or CSV, listing formulas vs cached values, notes, defined names, tables.
Editing existing files: set cells, append rows, insert/delete rows/columns (reference-aware via xlsx_restructure.py), copy/rename sheets, tables, names, notes, protection.
Recalculating formulas headlessly via LibreOffice (xlsx_recalc.py).
CSV interop with type inference and non-UTF-8 encodings.
Not for the legacy .xls binary format (use LibreOffice to convert first: soffice --headless --convert-to xlsx old.xls).

Prerequisites

Python 3.10+ with openpyxl (pip install openpyxl). No other third-party packages are needed; everything else is stdlib.
Optional: LibreOffice (soffice) for headless recalculation or format conversion.

How to Run

Run the helper scripts with the terminal tool from this skill's scripts/ directory (every script supports --help):

python scripts/xlsx_create.py spec.json report.xlsx   # build from JSON spec
python scripts/xlsx_read.py report.xlsx --sheets      # inventory
python scripts/xlsx_read.py report.xlsx --json --sheet Data
python scripts/xlsx_read.py report.xlsx --formulas
python scripts/xlsx_edit.py report.xlsx --sheet Data --set B2=42 --recalc
python scripts/xlsx_restructure.py report.xlsx --sheet Data --insert-rows 3:2
python scripts/xlsx_recalc.py report.xlsx
python scripts/csv_to_xlsx.py data.csv out.xlsx --encoding utf-8
python scripts/xlsx_to_csv.py report.xlsx out.csv --sheet Data

Read the full file on GitHub · 197 lines

Files

What ships with it

10 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.

5d ago First seen · 197 lines · 16 tokens per session scan A b302d7ac9978

Subscribe to this mod's changes

xlsx is a skill published in the GitHub repository nobodyohm-web/Thot (0 stars, last pushed 14d ago), licensed MIT. It adds 16 tokens to every session and 2,581 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to xlsx, differing in 0 lines, and is treated as a copy.

Documents LLM Spreadsheets ai-agents code audit cwe mcp

xlsx

Getting it into your agent

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 Skill

When to Use

Prerequisites

How to Run

What ships with it

What this file has done since we first saw it

Other skills, from other repositories

dcf-model

comps-analysis

lbo-model

excel-author

xlsx

3-statement-model