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🧮 Spreadsheet Formula Change Auditor
Compare two XLSX versions for formulas replaced by values, formula-family drift, broken references, new cycles, and workbook-control changes.
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You say
Before: Model!C3 contains =A3B3, D2 contains =C2$B$1, workbook calculates automatically. After: C3 contains 999, D2 contains =D2+$B$1, E2 contains =#REF!+1, calculation mode is manual.
Your agent does
Release gate: BLOCK Critical: formula replaced by value at Model!C3. Critical: new dependency cycle at Model!D2. Critical: #REF! at Model!E2 and manual calculation mode. High: formula and defined-name changes require owner reconciliation.
What you get
About this skill
Spreadsheet Formula Change Auditor creates a read-only, cell-level logic diff between an authoritative before workbook and a candidate after workbook. The deterministic local helper detects formulas replaced by values, removed, added, or changed formulas, relative-reference family outliers, #REF! formulas, new same-sheet dependency cycles, defined-name drift, hidden-sheet changes, external-link package changes, and manual calculation mode. It returns a change ledger, sheet summary, release gate, and review memo without opening Excel, recalculating, running macros, refreshing connections, or modifying either file.
How to install
Drop the file into your AI Agent. Works with Claude, Cursor, ChatGPT, and 20+ more.
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Creator
JustHandled Labs builds focused agent skills for the work nobody wants to do by hand. Each one is a single repeatable job done well: catching the security and data mistakes that quietly ship, keeping docs and tests honest, gating the commands an agent is about to run, sharpening writing, and handling the founder chores around launches, outreach, and brand setup. Not generic AI productivity. Specific workflows that are easy to run, review, and repeat. Maintained by H.J. Westerfield, with a background in communications, editing, project coordination, customer support, and practical AI systems. Tools for people who want useful automation without theatrical complexity.
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