spreadsheet-authoring SKILL.md skillA
spreadsheet-authoring from vellum-ai/vellum-assistant is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add vellum-ai/vellum-assistant/spreadsheet-authoring@git:20260924.5a6d38cPins git:20260924.5a6d38c in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- vellum-ai/vellum-assistant
- Path
skills/spreadsheet-authoring/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260924.5a6d38c, committed Sep 24, 2026
- Size
- 6,544 bytes
- Repository stars
- 1,483
- License
- MIT
Create and edit Excel spreadsheets (.xlsx) whose formulas carry their computed values, so sums and totals show in every viewer, plus date and time formats, recalculating and verifying an existing workbook.
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
# Spreadsheet Authoring Write workbooks whose numbers are visible everywhere they are opened. ## A formula is stored with the value it produced An `.xlsx` cell holding a formula stores two things: the formula text, and the value that formula last produced. Excel fills the value in when it saves. openpyxl writes none, because it has no formula engine. Anything that does not run a formula engine shows what the file stores. Chat file previews, Quick Look, Google Drive previews, and mail previews all read the stored value, so a workbook written by openpyxl shows `=SUM(C2:C7)` where the total should be, and a summary sheet of formulas comes out blank. So: write the computed value next to every formula. Compute it in Python, where the data already is. ## Install the two packages first Both come from PyPI and neither is there by default. Run this once at the start of the task; the import check makes it a no-op when they are already installed. ```bash python3 -c "import xlsxwriter, openpyxl" 2>/dev/null \ || pip install --user --quiet XlsxWriter==3.2.9 openpyxl==3.1.5 \ || pip install --user --quiet --break-system-packages XlsxWriter==3.2.9 openpyxl==3.1.5 ``` …
Read the whole file at its exact version.
How to install
mdr add vellum-ai/vellum-assistant/spreadsheet-authoring@sha256:8ba6c79cc8468fc8The line at the top of this page pins the label git:20260924.5a6d38c, 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.
[](https://markdownregistry.com/a/art_tlhfsdw63wtw6d4n)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Sep 24, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6544 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
vellum-ai/vellum-assistant · 1,483 stars · license MIT · pushed 2026-11-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_tlhfsdw63wtw6d4n GET https://markdownregistry.com/api/v1/resolve?ref=vellum-ai/vellum-assistant/spreadsheet-authoring GET https://markdownregistry.com/api/v1/blob/8ba6c79cc8468fc80f88f6cbf7078b7b6fd08f9f6f1a26c733db0ec3b7755344
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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