spreadsheet-authoring skillA
spreadsheet-authoring is agent-read markdown (skill) from vellum-ai/vellum-assistant: 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..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns 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 ``` …
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How to install
mdr add vellum-ai/vellum-assistant/spreadsheet-authoring@git:20260924.5a6d38cmdr add vellum-ai/vellum-assistant/spreadsheet-authoring@sha256:8ba6c79cc8468fc8Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_tlhfsdw63wtw6d4n)
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Source
vellum-ai/vellum-assistant · 1,314 stars · license MIT · pushed 2026-09-24 · 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
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