---
name: xlsx
description: Paste the data. Get a working spreadsheet with live formulas, totals and a chart. It builds a working spreadsheet with live formulas and a chart, not a flat table. Check the formulas before you rely on the totals.
---

# XLSX

## What it does
Paste the data. Get a working spreadsheet with live formulas, totals and a chart. It builds a working spreadsheet with live formulas and a chart, not a flat table. Check the formulas before you rely on the totals.

## When to use
- Building the sheet by hand.
- Whenever you would otherwise do this by hand.

## Instructions
1. Give the skill: Raw tabular data.
2. Use this as the core instruction (edit the [bracketed] parts):

   > Here is the [area / cost data]. Build a spreadsheet that totals by [level], adds a percentage column, and charts the split. Keep the formulas live.

3. Return: A working spreadsheet with charts.

## Output
A working spreadsheet with charts.

## The one mistake to avoid
Check the formulas before you trust the totals in front of a client.

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Model: Opus 4.8 / Sonnet · Typical time: 3 min
Copyright 2026 Chiang Ning. All Rights Reserved.