audit-xls

audit-xls is a skill for Claude Code, Codex from leecyno1/boutique-skills. It costs 104 tokens per session (1,545 once invoked), scanned A, a copy of audit-xls, MIT.

A spreadsheet-checking method that reviews formulas, errors, and the logic of a workbook, including financial-model checks.

In plain words
What is it for?
Use it to check a selected range, sheet, or full workbook, including financial models with income statements, balance sheets, and cash-flow links.
Why use it?
It helps find broken formulas, inconsistent calculations, hardcoded values, and mistakes that could make spreadsheet results unreliable.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to check a selected range, sheet, or full workbook, including financial models with income statements, balance sheets, and cash-flow links.

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Install with agentmods
npx agentmods add skills/leecyno1/boutique-skills/anthropic-fs-financial-analysis-audit-xls
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 leecyno1/boutique-skills --skill anthropic-fs-financial-analysis-audit-xls
Clone the repo
git clone --depth 1 https://github.com/leecyno1/boutique-skills

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.

agentmods badge for audit-xls

README.md
[![agentmods](https://agentmods.dev/badge/skills/leecyno1/boutique-skills/anthropic-fs-financial-analysis-audit-xls/github.svg)](https://agentmods.dev/skills/leecyno1/boutique-skills/anthropic-fs-financial-analysis-audit-xls)
Your own site
<a href="https://agentmods.dev/skills/leecyno1/boutique-skills/anthropic-fs-financial-analysis-audit-xls"><img src="https://agentmods.dev/badge/skills/leecyno1/boutique-skills/anthropic-fs-financial-analysis-audit-xls/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.

agentmods 80×15 button for audit-xls

Your own site · 80×15
<a href="https://agentmods.dev/skills/leecyno1/boutique-skills/anthropic-fs-financial-analysis-audit-xls"><img src="https://agentmods.dev/badge/skills/leecyno1/boutique-skills/anthropic-fs-financial-analysis-audit-xls.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 104 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,545 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 100% copy Near-identical to another mod 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00104 $0.01545
Opus 5 $0.00052 $0.00772
Sonnet 5 $0.00021 $0.00309
Haiku 4.5 $0.00010 $0.00154

Measured 8d ago against content hash df771f6b90fc, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

audit-xls 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 8d ago.

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.

Origin

This is a copy

100% identical to audit-xls — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/default/anthropic-fs-financial-analysis-audit-xls/SKILL.md · 157 lines

How it starts

The opening of the file, as written. The whole thing — 157 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Audit Spreadsheet

Audit formulas and data for accuracy and mistakes. Scope determines depth — from quick formula checks on a selection up to full financial-model integrity audits.

Step 1: Determine scope

If the user already gave a scope, use it. Otherwise ask them:

What scope do you want me to audit?

  • selection — just the currently selected range
  • sheet — the current active sheet only
  • model — the whole workbook, including financial-model integrity checks (BS balance, cash tie-out, roll-forwards, logic sanity)

The model scope is the deepest — use it for DCF, LBO, 3-statement, merger, comps, or any integrated financial model before sending to a client or IC.


Step 2: Formula-level checks (ALL scopes)

Run these regardless of scope:

Check What to look for
Formula errors #REF!, #VALUE!, #N/A, #DIV/0!, #NAME?
Hardcodes inside formulas =A1*1.05 — the 1.05 should be a cell reference
Inconsistent formulas A formula that breaks the pattern of its neighbors in a row/column
Off-by-one ranges SUM/AVERAGE that misses the first or last row
Pasted-over formulas Cell that looks like a formula but is actually a hardcoded value
Circular references Intentional or accidental
Broken cross-sheet links References to cells that moved or were deleted
Unit/scale mismatches Thousands mixed with millions, % stored as whole numbers
Hidden rows/tabs Could contain overrides or stale calculations

Step 3: Model-integrity checks (MODEL scope only)

If scope is model, identify the model type (DCF / LBO / 3-statement / merger / comps / custom) and run the appropriate integrity checks below.

3a. Structural review

Check What to look for
Input/formula separation Are inputs clearly separated from calculations?
Color convention Blue=input, black=formula, green=link — or whatever the model uses, applied consistently?
Tab flow Logical order (Assumptions → IS → BS → CF → Valuation)?
Date headers Consistent across all tabs?
Units Consistent (thousands vs millions vs actuals)?

Read the full file on GitHub · 157 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.

  1. 8d ago First seen · 157 lines · 104 tokens per session scan A df771f6b90fc

Subscribe to this mod's changes

audit-xls is a skill published in the GitHub repository leecyno1/boutique-skills (5 stars, last pushed today), licensed MIT. It adds 104 tokens to every session and 1,545 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to audit-xls, differing in 0 lines, and is treated as a copy.