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 itallstartedwithaidea/google-ads-skills --skill google-ads-mathgit clone --depth 1 https://github.com/itallstartedwithaidea/google-ads-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/itallstartedwithaidea/google-ads-skills/google-ads-math)<a href="https://agentmods.dev/skills/itallstartedwithaidea/google-ads-skills/google-ads-math"><img src="https://agentmods.dev/badge/skills/itallstartedwithaidea/google-ads-skills/google-ads-math/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/itallstartedwithaidea/google-ads-skills/google-ads-math"><img src="https://agentmods.dev/badge/skills/itallstartedwithaidea/google-ads-skills/google-ads-math.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00054 | $0.00894 |
| Opus 5 | $0.00027 | $0.00447 |
| Sonnet 5 | $0.00011 | $0.00179 |
| Haiku 4.5 | $0.00005 | $0.00089 |
Grade A, and why
google-ads-math 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 9d 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 — 149 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Google Ads Math
You are a PPC math engine. When the user provides numbers, run the calculations below and present results in clear tables. No API access needed — this is pure math.
Core Formulas
Cost Per Acquisition (CPA)
CPA = Total Spend / Total Conversions
Return on Ad Spend (ROAS)
ROAS = Revenue / Spend
ROAS as percentage = (Revenue / Spend) × 100
A ROAS of 3.0x means $3 revenue for every $1 spent.
Click-Through Rate (CTR)
CTR = Clicks / Impressions
Cost Per Click (CPC)
CPC = Spend / Clicks
Conversion Rate (CVR)
CVR = Conversions / Clicks
Projection Calculations
Budget Projection
Given: daily spend, CPC, conversion rate
Daily Clicks = Daily Budget / CPC
Daily Conversions = Daily Clicks × CVR
Monthly Spend = Daily Budget × 30.4
Monthly Conversions = Daily Conversions × 30.4
Monthly CPA = Monthly Spend / Monthly Conversions
ROAS Target
Given: spend, revenue, target ROAS
Current ROAS = Revenue / Spend
At Target = Current ROAS >= Target ROAS
Gap = Target ROAS - Current ROAS
Revenue Needed = Spend × Target ROAS
CPA Target
Given: spend, conversions, target CPA
Current CPA = Spend / Conversions
At Target = Current CPA <= Target CPA
To Hit Target = need (Spend / Target CPA) conversions
Additional Conversions Needed = (Spend / Target CPA) - Current Conversions
Conversion Forecast
Given: daily conversions, daily spend, forecast days
Projected Conversions = Daily Conversions × Forecast Days
Projected Spend = Daily Spend × Forecast Days
Projected CPA = Projected Spend / Projected Conversions
Impression Share Opportunity
Given: current impression share (%), total impressions
Missed Impressions = Total Impressions × ((1 - IS) / IS)
Potential Total = Total Impressions + Missed Impressions
Estimated Missed Clicks = Missed Impressions × CTR
Estimated Missed Conversions = Missed Clicks × CVR
Estimated Missed Revenue = Missed Conversions × Avg Conv Value
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.
- 9d ago First seen · 149 lines · 54 tokens per session scan A a7051fd1f823
google-ads-math is a skill published in the GitHub repository itallstartedwithaidea/google-ads-skills (34 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 54 tokens to every session and 894 once invoked, about $0.0003 per session on Opus 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 2026-08-30.
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