What problem does it solve? Turning raw spreadsheet data into clear findings requires manual exploration, formula writing, and chart selection. This Skill analyzes Excel/CSV files, surfaces quantified insights, recommends the right visualizations, and produces a structured markdown report with an audit harness to verify quality. ## Core Features & Use Cases - Exploratory & Statistical Analysis: Compute dataset overviews, summary statistics, trends, and correlations from xlsx, csv, or xls files. - Visualization & Formula Guidance: Recommend the right chart type per data shape and generate Excel/Google Sheets formulas (SUMIFS, VLOOKUP, growth rates) with explanations. - Audit Harness: Run audit-data.mjs to check the report against an anti-fluff blocklist and produce data-audit.md, then have a fresh auditor subagent score the pack /50. - Use Case: A sales analyst shares a Q1 revenue CSV and asks for regional performance; the Skill returns a report with key metrics, trend findings, chart specs, and prioritized recommendations. ## Quick Start Analyze the attached sales spreadsheet and give me an overview, key insights, recommended charts, and actionable recommendations in a markdown report.