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Artifact Spreadsheet

Community
win4r
artifact_spreadsheet

Create, read, edit, fix, or clean spreadsheet files (.xlsx, .xlsm, .csv, .tsv). Use whenever a build task's artifact kind is spreadsheet, or the task names a spreadsheet file and wants something done to it or produced from it, including restructuring messy tabular data into a proper workbook. Covers openpyxl generation, formulas and recalculation, editing existing workbooks, and the validation gates. Not for tasks whose deliverable is a document, report, or web page that merely contains a table.

Overview

Publisherwin4r
RepositoryMuseAI-Skills
Skill nameartifact_spreadsheet
Stars
382
Forks
116
Bundled files
2
Links
Skill sourceRepositoryHomepage
  • Markdown instructions

    A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.

  • Works with any LLM

    AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.

  • 2 bundled files

    Scripts, templates, and references the model can read while it works. Files are read-only and never executed.

  • Open source

    Published by win4r on GitHub. Read the source before you install it.

Installation

Install the Artifact Spreadsheet AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

1

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

  1. Open the app and go to Plugins → Skills.
  2. Choose "Install from GitHub".
  3. Paste the skill folder URL below and confirm.
    https://github.com/win4r/MuseAI-Skills/tree/main/opt/hatch/skills/artifacts/spreadsheet
  4. Enable the skill in any chat where you want it available.
Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.
2

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills
git clone --depth 1 https://github.com/win4r/MuseAI-Skills.git /tmp/MuseAI-Skills
mkdir -p .claude/skills
cp -r /tmp/MuseAI-Skills/opt/hatch/skills/artifacts/spreadsheet .claude/skills/artifact_spreadsheet
Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Artifact Spreadsheet in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Artifact Spreadsheet on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Artifact Spreadsheet is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

  • Loaded only when it is needed

    The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.

  • Switch models mid-chat

    Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

Spreadsheet artifacts

An xlsx is generated with the preinstalled openpyxl library from a generator script. Keep the generator under .src/: it is the editable source for future revisions, and the binary is always regenerated from it.

TaskPath
Create, or edit with formulas and formattingopenpyxl
Quick look at an existing sheetmuse.read (converted to markdown, paged); it carries no cell coordinates, so never plan edits from it
Read a workbook's model (formulas AND their values)two load_workbook passes; see /opt/hatch/skills/artifacts/spreadsheet/references/formulas.md
Bulk or messy tabular data in or outPython csv from the standard library; pip install --break-system-packages pandas when a task genuinely needs it
Design, structure, number formats, model conventions/opt/hatch/skills/artifacts/spreadsheet/references/visual.md
Formulas, recalculation, editing existing workbooks/opt/hatch/skills/artifacts/spreadsheet/references/formulas.md

Requirements on every delivered workbook:

  • Set a non-empty workbook.properties.title and a human-readable filename. Data enters the workbook from the build's gathered content only; a value you do not have is a blank cell or a question, never an invented number.
  • Write formulas, never precomputed results: sheet["B10"] = "=SUM(B2:B9)", not the Python-computed total. The sheet must recalculate when its inputs change.
  • Follow the user's spec literally: their exact tab names, exact column headers, and the formula they spelled out. A redesign that computes something else fails, however elegant.
  • Zero formula errors at delivery: run the recalculation gate below and fix what it names.
  • Document assumptions and hardcoded numbers where the reader will see them (a cell comment or an adjacent labeled cell), citing the real source when one exists and saying plainly when the number came from the user.
  • A workbook created for someone to fill in gets a short legend naming the cells to edit and one example row of realistic values; never add an example row to a file you were asked to edit.

Scripts

ScriptWhat it does
/opt/hatch/skills/artifacts/scripts/recalc_xlsx.pyRecalculates the workbook in place through headless LibreOffice and reports every formula-error cell as JSON; mandatory whenever the file contains formulas. errors_found exits 0: read the JSON, not the exit code
/opt/hatch/skills/artifacts/scripts/validate_xlsx.pyOpens the workbook read-back: zip integrity, sheet parts, populated-cell counts; do not deliver a link while it fails. A csv output gets no reader check

Verification

Run recalc_xlsx.py (when formulas exist), then validate_xlsx.py, then follow /opt/hatch/skills/artifacts/testing/SKILL.md. A clean recalculation proves the formulas evaluate, not that they are right: spot-check two or three formulas pull the values you expect before building out a grid.

Bundled files

The model reads these on demand while the skill is loaded. They are exposed as readable files and are never executed.

Frequently asked questions

What does the Artifact Spreadsheet AI skill do?

Create, read, edit, fix, or clean spreadsheet files (.xlsx, .xlsm, .csv, .tsv). Use whenever a build task's artifact kind is spreadsheet, or the task names a spreadsheet file and wants something done to it or produced from it, including restructuring messy tabular data into a proper workbook. Covers openpyxl generation, formulas and recalculation, editing existing workbooks, and the validation gates. Not for tasks whose deliverable is a document, report, or web page that merely contains a table.

Why use Artifact Spreadsheet on TypingMind?

Because you install it once and use it with any model. Artifact Spreadsheet is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Artifact Spreadsheet in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/win4r/MuseAI-Skills/tree/main/opt/hatch/skills/artifacts/spreadsheet. TypingMind reads its SKILL.md and bundles its files and installs it as a skill you can enable per chat.

Which AI models can use Artifact Spreadsheet?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Artifact Spreadsheet?

As many as you like. As long as a model supports skills, you can use Artifact Spreadsheet with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Artifact Spreadsheet AI skill free?

It is published on GitHub by win4r. Check the repository for licensing terms. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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