This skill kicks in whenever a spreadsheet is the main input or output of the task.

It works with .xlsx, .xlsm, .csv and .tsv files, either from scratch or from other data sources.

In practice it adds columns, computes formulas, formats cells, builds charts and cleans up messy data.

It makes a point of delivering models with zero formula errors and respecting the conventions of existing templates, including color coding in financial models.

When to use

To create or fix spreadsheets with formulas and formatting.
When cleaning messy tabular data in .csv or .xlsx files.
When you need to convert between tabular formats.

How to use

Point to the spreadsheet and describe the task, like “compute the monthly totals and format this sheet”.