Agent skill · business finance · yonatangross
business-case
ROI, NPV, IRR, payback and TCO for investment decisions. Use when building a financial justification, cost-benefit or build-vs-buy analysis.
Why this skill is useful
Provides detailed frameworks and templates for financial analysis that the AI wouldn't reliably generate on its own.
What it needs
About 3k tokens when loaded. Last updated 2026-08-06. 215 stars on the source repository.
What this skill does
Business Case Financial frameworks for investment justification and decision support. When to Use Each Framework Framework Use When ----------- ---------- ROI Quick sanity check; time value of money doesn't matter much NPV Multi-year investments; gold standard for GO/NO-GO IRR Comparing projects competing for the same budget Payback Period Leadership asks "how fast do we break even?" TCO Build vs. buy; total cost including hidden/ongoing costs Sensitivity Analysis High uncertainty; need to stress-test assumptions Decision Tree Quick Reference Formulas Business Case Template TCO: Build vs. Buy vs. Partner See rules/business-cost-benefit.md for the full 3-year TCO template and hidden cost checklist. Key hidden costs to never omit: Category Build Buy ---------- ------- ----- Opportunity cost Yes — team blocked from other work No Switching costs N/A Yes — vendor lock-in Downtime risk You own uptime Partial SLA coverage Security/compliance Your responsibility Shared Common Pitfalls Pitfall Mitigation --------- ------------ Simple ROI without time value Always use NPV for multi-year decisions Ignoring soft costs (training, change mgmt) Add 30% buffer to implementation estimates Optimistic benefit estimates Use conservative estimates, document assumptions Sunk cost included in forward analysis Evaluate future costs/benefits only No sensitivity analysis Always test conservative + optimistic scenarios References ROI & Financial Metrics — NPV, IRR, payback period formulas with code examples Cost-Benefit & TCO — Build vs. …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills yonatangross/business-case--916b79