A local spreadsheet tool for recalculating Excel workbooks, editing cells or formulas, and tracing where values come from. It can also record grouped changes and their results.

Use it to inspect selected cells, trace formula inputs and outputs, apply batch edits, and recalculate a finished .xlsx workbook.

It addresses stale formula results and makes it easier to investigate unexpected numbers without relying on unverified cached values. Running locally avoids requiring a separate server, network access, or credentials.

formualizer — Plugin for Claude Code by PSU3D0/agent-spreadsheet

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.

Clone the repo

git clone --depth 1 https://github.com/PSU3D0/agent-spreadsheet

Made for: Claude Code.

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/plugins/psu3d0/agent-spreadsheet/formualizer/github.svg)](https://agentmods.dev/plugins/psu3d0/agent-spreadsheet/formualizer)

Your own site

<a href="https://agentmods.dev/plugins/psu3d0/agent-spreadsheet/formualizer"><img src="https://agentmods.dev/badge/plugins/psu3d0/agent-spreadsheet/formualizer/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/plugins/psu3d0/agent-spreadsheet/formualizer"><img src="https://agentmods.dev/badge/plugins/psu3d0/agent-spreadsheet/formualizer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured The manifest loads nothing itself; its 1 skill, 1 MCP server cost 54 tokens a session between them.

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.

Security

Grade A, and why

formualizer 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 today.

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.

plugins/formualizer/.claude-plugin/plugin.json · 27 lines

What it actually says

{
  "name": "formualizer",
  "displayName": "Formualizer",
  "version": "0.18.2",
  "description": "Recalculate, edit, inspect and trace Excel workbooks. Fixes stale formula results, applies batch edits with a change receipt, and shows where any number comes from. Runs locally with a bundled engine.",
  "author": {
    "name": "Formualizer",
    "url": "https://github.com/PSU3D0/formualizer"
  },
  "license": "Apache-2.0",
  "keywords": [
    "spreadsheet",
    "excel",
    "xlsx",
    "recalculation",
    "formulas",
    "financial-modeling",
    "audit"
  ],
  "homepage": "https://www.formualizer.dev",
  "repository": "https://github.com/PSU3D0/formualizer-plugin",
  "documentationUrl": "https://www.formualizer.dev/docs",
  "supportUrl": "https://github.com/PSU3D0/formualizer/issues",
  "privacyPolicyUrl": "https://github.com/PSU3D0/formualizer-plugin/blob/main/README.md#privacy--data-handling",
  "termsOfServiceUrl": "https://github.com/PSU3D0/formualizer-plugin/blob/main/LICENSE"
}

Contents

What it installs

The manifest is a name and a version. 1 skill, 1 MCP server travel with it, and installing the plugin installs all of them — 54 tokens a session between them. Each is measured on its own page, and each can be installed alone.

Files

What ships with it

2 files beside plugin.json in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

today Changed a72131a9048e
2d ago First seen · 27 lines scan A fdac492a799a

Subscribe to this mod's changes

formualizer is a plugin published in the GitHub repository PSU3D0/agent-spreadsheet (64 stars, last pushed yesterday), licensed Apache-2.0. Its token cost is not measured: this kind of file is read by the harness, not the model. 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 2026-11-10.

Documents Spreadsheets spreadsheet spreadsheet-agent spreadsheet-ai spreadsheet-mcp

formualizer next to 6 plugins from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
formualizerPSU3D0/agent-spreadsheet	Plugin	64	yesterday	Apache-2.0	A	—	Claude Code
model-builderanthropics/financial-services	Plugin	41k	14d ago	Apache-2.0	A	—	Claude Code
wafflebasewafflebase/wafflebase	Plugin	68	yesterday	Apache-2.0	A	—	Claude Code
dokmatiq-docgendokmatiq/docgen-sdks	Plugin	0	1mo ago	MIT	A	—	Claude Code
ash-workflowCookiesHaha/ash-claude-skills	Plugin	2	3mo ago	MIT	A	—	Claude Code
document-skillsmrt150683-lgtm/atlas-cms	Plugin	5	3mo ago	AGPL-3.0	A	—	Claude Code
10x-canva-skillsOpenAnalystInc/10x-Canva-Skills	Plugin	7	8mo ago	none	A	—	Claude Code