XLSX

The XLSX skill covers working with Excel files properly: writing real formulas rather than pre-computed values, applying number formats and styles, and managing multiple sheets and references correctly.

Why a skill for this

It’s easy for an agent to produce a spreadsheet that looks right but is actually just static values pasted where formulas should be — which breaks the moment the underlying data changes. This skill steers toward spreadsheets that behave the way a human analyst would build them.

Good for

Building financial models, data summaries, and recurring reports that need to stay live and recalculable, not just a one-time snapshot.