Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add LeadMagic/gtm-skills --skill roi-calculatorgit clone --depth 1 https://github.com/LeadMagic/gtm-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/leadmagic/gtm-skills/roi-calculator)<a href="https://agentmods.dev/skills/leadmagic/gtm-skills/roi-calculator"><img src="https://agentmods.dev/badge/skills/leadmagic/gtm-skills/roi-calculator/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/leadmagic/gtm-skills/roi-calculator"><img src="https://agentmods.dev/badge/skills/leadmagic/gtm-skills/roi-calculator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00103 | $0.02764 |
| Opus 5.5 | $0.00041 | $0.01106 |
| Sonnet 5.5 | $0.00021 | $0.00553 |
| Haiku 4.5 | $0.00010 | $0.00276 |
Grade A, and why
roi-calculator scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 26d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 261 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ROI Calculator
Overview
An ROI calculator turns "this seems valuable" into "this pays for itself in 4.3 months with a 3-year ROI of 340%." It is the single most powerful document in enterprise sales because it translates product capabilities into financial outcomes that economic buyers can approve. The mistake: building a calculator that overclaims and destroys credibility. The fix: conservative assumptions with documented sources, so every number is defensible under scrutiny.
Authoritative Foundations
- Madhavan Ramanujam — Monetizing Innovation (WTP research)
- ValueSelling Framework — Value pyramid and quantified value
- David Skok — SaaS Unit Economics — SaaS metrics — CAC payback, LTV/CAC, unit economics by stage.
- MEDDICC — Economic Buyer + Metrics (quantified value) — Qualification scorecard — Metrics, Economic buyer, Decision criteria, Champion, Competition.
- Gartner — TCO and ROI methodology
When to Use
Trigger phrases: "build an ROI calculator", "create a business case", "calculate the ROI for [prospect]", "quantify our value", "build a TCO comparison", "payback period calculation", "3-year ROI projection", "value calculator", "economic buyer justification", "MEDDICC metrics slide"
5 Types of ROI Calculators
| Type | Use When | Best For | Example |
|---|---|---|---|
| Time Savings | Your product eliminates manual work | Productivity tools, automation | "Eliminates 15 hours/week of manual data entry" |
| Revenue Increase | Your product generates more revenue | Sales tools, marketing platforms | "Increases reply rates from 3% to 12% = 4x pipeline" |
| Cost Reduction | Your product replaces existing spend | Infrastructure, tool consolidation | "Replaces 3 tools at $500/mo each with 1 at $800/mo" |
| Risk Mitigation | Your product prevents losses | Security, compliance, data | "Prevents average data breach cost of $4.45M" |
| Hybrid (TCO) | Your product impacts multiple areas | Enterprise platforms | Total cost of ownership: current vs proposed state |
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 26d ago Changed 79c8d43da1cd
- 1mo ago First seen · 261 lines · 103 tokens per session scan A 9b8e6dc03971
roi-calculator is a skill published in the GitHub repository LeadMagic/gtm-skills (69 stars, last pushed 13d ago), licensed MIT. It adds 103 tokens to every session and 2,764 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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