Excel Model Skill

A model is only useful if it's live — change an assumption and everything recalculates. A markdown table can't do that; a real .xlsx with cell formulas can. This skill builds an actual Excel workbook by writing and running an openpyxl script: a clean inputs sheet, calculation sheets that reference those inputs with real = formulas, and sensible formatting — so the user gets a file they can drive, not a snapshot.

Environment: this produces a binary file, so it needs a place to run code — Claude Code, the Anthropic API code-execution tool, or Claude.ai (with the analysis/code tool). In the browser playground (no code execution), use the markdown output as the spec instead.

Required Inputs

Ask for these only if they aren't already provided: