A headless spreadsheet tool for workbooks containing cells, formulas, tables, charts, pivots, and multiple sheets. It can open and save formats such as XLSX, CSV, and TSV, and can calculate formulas.

Use it to build budgets, edit cells and formulas, recalculate totals, convert workbook formats, and export spreadsheets or sheets as PDF.

It automates spreadsheet changes and recalculation without opening a spreadsheet application. This helps keep totals and converted files up to date in scripted workflows.

gridcraft — Skill for Claude Code and Codex by BlackBeltTechnology

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add BlackBeltTechnology/pi-agent-dashboard --skill gridcraft

Clone the repo

git clone --depth 1 https://github.com/BlackBeltTechnology/pi-agent-dashboard

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/blackbelttechnology/pi-agent-dashboard/gridcraft/github.svg)](https://agentmods.dev/skills/blackbelttechnology/pi-agent-dashboard/gridcraft)

Your own site

<a href="https://agentmods.dev/skills/blackbelttechnology/pi-agent-dashboard/gridcraft"><img src="https://agentmods.dev/badge/skills/blackbelttechnology/pi-agent-dashboard/gridcraft/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/blackbelttechnology/pi-agent-dashboard/gridcraft"><img src="https://agentmods.dev/badge/skills/blackbelttechnology/pi-agent-dashboard/gridcraft.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 82 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,182 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00082	$0.02182
Opus 5.5	$0.00033	$0.00873
Sonnet 5.5	$0.00016	$0.00436
Haiku 4.5	$0.00008	$0.00218

Measured yesterday against content hash 1fa7eadf2b31, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

gridcraft scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

packages/craft-apps/.pi/skills/gridcraft/SKILL.md · 121 lines

How it starts

The opening of the file, as written. The whole thing — 121 lines — stays where its author put it; the contents beside it link to each section on GitHub.

GridCraft — headless spreadsheets

GridCraft is ArtCraft's spreadsheet app (341 commands in 0.7.0, 514 formula functions). pi-craft provisions the headless gridcraft-cli on first use (no desktop app). App choice, the loop, hand-off formats and the MCP policy live in craft-studio; tables and numbers go to GridCraft, not WordCraft/DeckCraft.

What it is for / formats

Create and edit workbooks (cells, formulas, formats, tables, charts, pivots, sheets), evaluate formulas, recalculate, convert, export. Open: xlsx xlsm xls xlsb ods csv tsv txt json. Write (convert, run --out, file.saveAs): xlsx csv tsv json html, and pdf only from run (--out x.pdf or file.saveAs/file.exportPdf; convert rejects .pdf). The native project file is the .xlsx.

CLI dialect

pi-craft gridcraft exec <args…> passes the arguments to gridcraft-cli.

gridcraft-cli commands [--json] [--search X]          # table by default; --json = id,label,menu,params,shortcut; NO --filter
gridcraft-cli commands --search chart                 # substring filter on the id/label (the "describe" of this app = the params column)
gridcraft-cli run [--in FILE | --sample NAME] [--cmd 'id={json}']... [--script FILE.jsonl] [--out FILE] [--print RANGE] [--quiet]
gridcraft-cli eval <formula> [--in FILE] [--sheet S] [--cell A1] [--json]
gridcraft-cli cat <file> [--range A1:D20] [--sheet S] [--formulas] [--csv]
gridcraft-cli convert <in> <out> [--sheet NAME]       # xlsx/csv/tsv/json/html by extension
gridcraft-cli info <file> [--json]                    # sheets, used ranges, tables, charts, names
gridcraft-cli check <file-or-dir>... [--json]         # cached-value calc oracle + xlsx round-trip; exit 1 on any difference
gridcraft-cli functions [--search X] [--category C]   # formula function catalogue with signatures

There is no describe; parameters are the params column of commands.
run takes repeated --cmd 'id={json}' (id=JSON, single-quoted; a bare id takes no params). All commands run in order on one in-memory workbook. --in FILE opens a file, --sample budget|sales|grades a demo workbook, neither = blank.
--script FILE.jsonl: one step per line, either {"command":"cell.set","params":{…}} or a plain cell.set={…} line.
--print A1:D4 prints that range after the commands; --quiet hides per-command JSON.
Typing model: cell.set {cell,input} (input =… is a formula), range.setValues {range,values:[[…]]} (strings starting = are formulas, null = empty), sheet.read {range,formulas?} returns values, cell.get one cell.

Read the full file on GitHub · 121 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

yesterday First seen · 121 lines · 82 tokens per session scan A 1fa7eadf2b31

Subscribe to this mod's changes

gridcraft is a skill published in the GitHub repository BlackBeltTechnology/pi-agent-dashboard (319 stars, last pushed yesterday), licensed MIT. It adds 82 tokens to every session and 2,182 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-15.

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