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gridcraft SKILL.md skillA

gridcraft from midasmatterhorn/artcraft-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add midasmatterhorn/artcraft-skills/gridcraft@git:20261104.a5ac27d

Pins git:20261104.a5ac27d in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: midasmatterhorn/artcraft-skills
Path: gridcraft/SKILL.md
Versions recorded: 7
Latest version: git:20261104.a5ac27d, committed Nov 4, 2026
First version recorded: Oct 22, 2026
Size: 37,259 bytes
Repository stars: 62
License: MIT

GridCraft is an open-source, clean-room Rust reimplementation of Microsoft Excel: a spreadsheet app for macOS (also Windows, Linux, BSD and the web) that reads and writes real .xlsx files and can be driven headlessly through a CLI, an MCP server and a live JSON control channel. Use this skill whenever the user mentions GridCraft by name; asks what it can do or which formats, keyboard shortcuts, commands or worksheet functions it has; wants to create, edit, convert, calculate, print or export…

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# GridCraft

**Audit basis.** Refreshed 2026-11-04 against tag **v0.16.0**, commit **`85e51e009c24fad47575f04d3c08f12342615d82`** — `git rev-parse HEAD` in the pinned checkout confirms, and the installed `/Applications/GridCraft.app` matches (its binary prints `GridCraft 0.16.0`). The previous release this skill described was v0.15.0 (`30b210b`).

**v0.15.0 → v0.16.0 delta.** 239 files changed; +7 command ids (`data.solverLoadModel`, `data.solverReset`, `data.solverSaveModel`, `equation.edit`, `insert.equation`, `python.output`, `python.set`), none removed. The Solver surface is new (its `data.solver*` family), data tables can sit beneath charts, and Page Setup gained a page order (down-then-over / over-then-down).

**Verify against your installed version** — the ArtCraft Launcher auto-updates, so a newer build may differ; every count quoted here was re-measured at this tag, and code paths that moved were re-cited. The measurement method for each count is in `evidence.md`.
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add midasmatterhorn/artcraft-skills/gridcraft@sha256:58a389bb121e81cf

The line at the top of this page pins the label git:20261104.a5ac27d, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

[![mdr](https://markdownregistry.com/badge/art_dm62xissraq54ecm.svg)](https://markdownregistry.com/a/art_dm62xissraq54ecm)

2 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 7 versions of this file, between Oct 22, 2026 and Nov 4, 2026, about one every 2 days.

version	committed	commit	size	audit
git:20261104.a5ac27d latest	2026-11-04	a5ac27d	37,259 B	A	view · diff
git:20261102.c601545	2026-11-02	c601545	36,804 B	A	view · diff
git:20261101.18741c7	2026-11-01	18741c7	34,563 B	A	view · diff
git:20261029.b8b54c3	2026-10-29	b8b54c3	33,282 B	A	view · diff
git:20261026.76415fe	2026-10-26	76415fe	44,253 B	A	view · diff
git:20261023.8287b5e	2026-10-23	8287b5e	38,338 B	A	view · diff
git:20261022.ca0d7e4	2026-10-22	ca0d7e4	26,874 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (37259 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag

Source

GitHub

midasmatterhorn/artcraft-skills · 62 stars · license MIT · pushed 2026-11-04 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_dm62xissraq54ecm
GET https://markdownregistry.com/api/v1/resolve?ref=midasmatterhorn/artcraft-skills/gridcraft
GET https://markdownregistry.com/api/v1/blob/58a389bb121e81cf160b800fc93325014352dd04c7bf7dcc95f278d9c91ce05f

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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