Use this skill any time a spreadsheet file is the primary input or output. This means any task where the user wants to: open, read, edit, or fix an existing .xlsx, .xlsm, .csv, or .tsv file (e.g., adding columns…

Agent skill published as a SKILL.md in eigent-ai/eigent (folder resources/example-skills/xlsx). Install it with one command using the open skills CLI, or copy the folder into ~/.claude/skills/.