Xlsx

It uses openpyxl for .xlsx files and Python's built-in csv module for CSVs, so no fancy formatting or formula evaluation, just raw data extraction. Handy when you need Claude to quickly parse spreadsheet contents without manually copying and pasting. The triggers are sensible, firing on file extensions or when you mention spreadsheets in your prompt. It's straightforward utility code from axoviq.com under AGPL-3.0, nothing fancy but gets the job done if you're frequently asking Claude to analyze tabular data.