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 domain-specific financial analysis frameworks and calculations 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