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Agent skill

XLSX

by codewhale-hq in codewhale-hq/Codewhale

Create/edit/analyze/verify spreadsheet workbooks including XLSX/CSV/TSV.

MITAuto-check passedDocuments & Office

Install XLSX

skills CLI
$ npx skills add codewhale-hq/Codewhale --skill xlsx -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install codewhale-hq/Codewhale xlsx --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/codewhale-hq/Codewhale.git skills-src && mkdir -p .claude/skills && cp -r skills-src/crates/tui/assets/skills/xlsx .claude/skills/xlsx && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
xlsx
GitHub stars
41k
Token cost
~112 tokens
SKILL.md length
43 words
Files
1
Skills in repo
63
Repo updated
First seen
Licence
MIT

At a glance

Create/edit/analyze/verify spreadsheet workbooks including XLSX/CSV/TSV.

  • Works in 3 steps: Prefer structured tables with clear… → Keep formulas auditable. → Verify by reopening and checking key…
  • Tasks that involve Excel spreadsheets
  • SKILL.md covers When to use, Compatibility and Workflow
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

XLSX is an agent skill from codewhale-hq/Codewhale. Create/edit/analyze/verify spreadsheet workbooks including XLSX/CSV/TSV.

Its SKILL.md is about 110 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Documents & Office, covering Excel spreadsheets and CSV and tabular files. It works with Microsoft Excel. The repository describes itself as: Open-source Rust agent engine and terminal client for Codewhale, with provider choice, tools, approvals and receipts. The licence is MIT.

When your agent uses it

  • Tasks that involve Excel spreadsheets
  • Tasks that involve CSV and tabular files

Example prompts

  • “/xlsx”

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

  1. Prefer structured tables with clear headers.
  2. Keep formulas auditable.
  3. Verify by reopening and checking key cells/aggregates.

What it can do on your machine

Read from SKILL.md and the folder at commit 8d2fb45. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

XLSX loads about 112 tokens when it runs. Until then it costs about 19 tokens; SKILL.md has 43 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~19
When it runs · the whole SKILL.md, loaded when a task matches
~112

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from codewhale-hq/Codewhale at commit 8d2fb45, republished under its MIT licence (© codewhale-hq). 43 words, ~112 tokens.

Download SKILL.mdSave it as .claude/skills/xlsx/SKILL.md (or your agent's skills folder).
name
xlsx
description
Create/edit/analyze/verify spreadsheet workbooks including XLSX/CSV/TSV.
invocation
model+user

Xlsx

When to use

Use for spreadsheets, tabular analysis, formulas, and charts in workbooks.

Compatibility

spreadsheets is a compatibility alias for this skill.

Workflow

  1. Prefer structured tables with clear headers.
  2. Keep formulas auditable.
  3. Verify by reopening and checking key cells/aggregates.

© codewhale-hq, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in crates/tui/assets/skills/xlsx of codewhale-hq/Codewhale.

Open the folder on GitHubat commit 8d2fb45

Compare with similar skills

XLSX next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

XLSX compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
XLSX this skillcodewhale-hq/Codewhale41k—~112Automated safety check: PassMIT
Data Table Managern8n-io/n8n207k—~2.3kAutomated safety check: PassCustom licence
Instrument Data To Allotropeaws-samples/amazon-bedrock-agents-healthcare-lifesciences2742 repos~2.7kAutomated safety check: PassApache-2.0
Markitshift-labs-ai/markit1.3k—~299Automated safety check: PassMIT
Convert Fileduckdb/duckdb-skills6041 repos~720Automated safety check: NotesMIT
Research Integrity Auditxuzhougeng/wisp-science1k—~2.6kAutomated safety check: PassAGPL-3.0

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Works with

Categories

Questions about XLSX

What does XLSX do?

Create/edit/analyze/verify spreadsheet workbooks including XLSX/CSV/TSV. XLSX is an agent skill from codewhale-hq/Codewhale. Create/edit/analyze/verify spreadsheet workbooks including XLSX/CSV/TSV.

When should I use XLSX?

XLSX fits situations like: tasks that involve Excel spreadsheets; tasks that involve CSV and tabular files.

How do I install XLSX in Claude Code?

Run `npx skills add codewhale-hq/Codewhale --skill xlsx -a claude-code`. Or copy the skill folder (crates/tui/assets/skills/xlsx in codewhale-hq/Codewhale) into .claude/skills/xlsx in your project. Claude Code loads it when a task matches its description.

How do I install XLSX in Codex?

Run `npx skills add codewhale-hq/Codewhale --skill xlsx -a codex`. Or copy the skill folder (crates/tui/assets/skills/xlsx in codewhale-hq/Codewhale) into .agents/skills/xlsx in your project. Codex loads it when a task matches its description.

Can I use XLSX in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add codewhale-hq/Codewhale --skill xlsx -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/xlsx, .gemini/skills/xlsx, .github/skills/xlsx and .opencode/skills/xlsx in your project.

What does XLSX need to run?

SKILL.md names no scripts, command-line tools or credentials: XLSX is instructions for the agent only.

Does XLSX access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is XLSX safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does XLSX use?

XLSX is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does XLSX use?

About 112 tokens (SKILL.md is roughly 448 characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to XLSX?

Skills that share tags, products or a category with XLSX: Data Table Manager (n8n-io/n8n, 207k stars), Instrument Data To Allotrope (aws-samples/amazon-bedrock-agents-healthcare-lifesciences, 274 stars), Markit (shift-labs-ai/markit, 1.3k stars) and Convert File (duckdb/duckdb-skills, 604 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains XLSX?

codewhale-hq (a GitHub organization) maintains it in codewhale-hq/Codewhale, which has 41,078 GitHub stars. The repository holds 63 skills in this directory. The repository was last updated on October 9, 2026.

Source: codewhale-hq/Codewhale on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.