A method for creating and changing Excel .xlsx spreadsheets with code. It supports worksheets, data entry, cell formatting, and file output.

Use it to build Excel files, add data to worksheets, format cells, and automate data analysis or reporting tasks.

It removes repetitive manual spreadsheet work when data or reports need to be generated programmatically.

skill-026 — Skill for Claude Code and Codex by legendtkl: A method for creating and changing Excel .xlsx spreadsheets…

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.

agentmods

npx agentmods add skills/legendtkl/agentic-skill-router/skill-026

Any agent

npx skills add legendtkl/agentic-skill-router --skill skill-026

Clone the repo

git clone --depth 1 https://github.com/legendtkl/agentic-skill-router

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/legendtkl/agentic-skill-router/skill-026.svg)](https://agentmods.dev/skills/legendtkl/agentic-skill-router/skill-026)

Your own site

<a href="https://agentmods.dev/skills/legendtkl/agentic-skill-router/skill-026"><img src="https://agentmods.dev/badge/skills/legendtkl/agentic-skill-router/skill-026.svg" alt="Measured on agentmods" height="20"></a>

Per session 35 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 329 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original 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	$0.00035	$0.00329
Opus 5	$0.00017	$0.00164
Sonnet 5	$0.00007	$0.00066
Haiku 4.5	$0.00003	$0.00033

Measured 6d ago against content hash 20b72c0adf73, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

skill-026 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 6d 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.

experiments/dci-compare/skillrouter-skills/skill-026/SKILL.md · 45 lines

What it actually says

Spreadsheet Automation

Overview

The Spreadsheet Automation skill allows users to generate and manipulate Excel spreadsheets (.xlsx) programmatically. This is useful for tasks such as data analysis, reporting, and automating repetitive spreadsheet processes.

Workflow Decision Tree

Creating a New Spreadsheet

Use the "Creating a new Excel file" workflow below.

Creating a New Excel File

To create an Excel file, you can utilize the xlsx library, which enables you to generate worksheets, write data, and format cells.

Prerequisites

Make sure you have the xlsx library installed:

npm install xlsx

Sample Code

Here’s an example of generating a new spreadsheet:

const XLSX = require('xlsx');

// Create a new workbook
let wb = XLSX.utils.book_new();

// Add a new worksheet
let ws_data = [['Name', 'Age'], ['Alice', 30], ['Bob', 25]];
let ws = XLSX.utils.aoa_to_sheet(ws_data);
XLSX.utils.book_append_sheet(wb, ws, 'Sheet1');

// Write the workbook to a file
XLSX.writeFile(wb, 'output.xlsx');

Conclusion

The Spreadsheet Automation skill is a powerful tool for users looking to automate their Excel spreadsheet tasks, making data manipulation and analysis much more efficient.

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.

6d ago First seen · 45 lines · 35 tokens per session scan A 20b72c0adf73

Subscribe to this mod's changes

skill-026 is a skill published in the GitHub repository legendtkl/agentic-skill-router (5 stars, last pushed 3mo ago), licensed MIT. It adds 35 tokens to every session and 329 once invoked, about $0.0002 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.

Analytics and metrics Documents Spreadsheets

dcf-model

Build discounted cash flow valuation workbooks in Excel.

NousResearch/hermes-agent · 14 tokens

audit-xls

Audit a spreadsheet for formula accuracy, errors, and common mistakes. Scopes to a selected range, a single sheet, or the entire model (including financial-model integrity checks like BS balance, cash tie-out, and logic sanity). Triggers on "audit this sheet", "check my formulas", "find formula errors", "QA this…

anthropics/financial-services · 104 tokens

skill-026