Spreadsheets (XLSX)Skill

by Anthropic

Added to Onei Jul 22, 2026

Repository Docs

markdown Document Processing

Summary

Open, create, and edit spreadsheets — formulas, formatting, charts, data cleaning, and CSV/TSV conversion.

Install This Skill

Add this skill to your favorite AI agent in a few steps.

Any AI agent

This skill is plain instructions — it works with any assistant that accepts custom instructions or system prompts.

Copy the skill content with the button below.
Paste it into your agent's instruction file or system prompt (for example AGENTS.md, .cursorrules, or a custom instructions field).
Ask the agent to apply the skill whenever the task matches.

Claude Code & Claude apps

Claude loads skills automatically from its skills directory.

Claude Code

Create a skill folder — personal: ~/.claude/skills/xlsx/, or per-project: .claude/skills/xlsx/
Save the skill content as SKILL.md inside that folder.
Claude Code picks it up automatically and invokes it when relevant.

mkdir -p ~/.claude/skills/xlsx

Claude.ai / Claude Desktop

Enable Skills under Settings → Capabilities, then upload the skill (a folder or zip containing SKILL.md).

One-prompt install

Paste this prompt into any agent with web access and it will install the skill for you.

Install the "Spreadsheets (XLSX)" skill from Onei AI. Fetch https://onei.ai/skills/xlsx, extract the full skill content from the page, and save it where you load skills from (for Claude Code: .claude/skills/xlsx/SKILL.md). From now on, apply this skill whenever it is relevant to my request.

Skill Content

Markdown Content

Copy this content and use it with your preferred AI agent

# Spreadsheet Skill

Use this skill whenever a spreadsheet file is the primary input or output.

## When to use
- Opening, reading, editing, or fixing an existing `.xlsx`/`.csv`/`.tsv`
- Adding columns, computing formulas, formatting, or charting
- Creating a new spreadsheet from scratch or from other data
- Cleaning messy tabular data (malformed rows, stray headers) into a proper sheet
- Converting between tabular formats

## How it works
The skill uses `openpyxl` and pandas-style processing to preserve formulas, number formats, and charts through edits, and applies data-cleaning heuristics to turn raw exports into structured sheets.

Description

A skill for spreadsheet work where an .xlsx, .xlsm, .csv, or .tsv file is the primary input or output. It reads and edits existing spreadsheets (adding columns, computing formulas, formatting, charting), builds new ones from scratch or other data sources, cleans messy tabular data into well-formed sheets, and converts between tabular formats.

Install

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