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 cxcscmu/SkillLearnBench --skill excel-statistics-formulasgit clone --depth 1 https://github.com/cxcscmu/SkillLearnBenchWrote 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/cxcscmu/skilllearnbench/excel-statistics-formulas)<a href="https://agentmods.dev/skills/cxcscmu/skilllearnbench/excel-statistics-formulas"><img src="https://agentmods.dev/badge/skills/cxcscmu/skilllearnbench/excel-statistics-formulas.svg" alt="Measured on agentmods" 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 | $0.00031 | $0.00248 |
| Opus 5 | $0.00015 | $0.00124 |
| Sonnet 5 | $0.00006 | $0.00050 |
| Haiku 4.5 | $0.00003 | $0.00025 |
Grade A, and why
excel-statistics-formulas 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 3d 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.
What it actually says
Excel Statistical Formulas
Common Statistical Functions
=MIN(range)
=MAX(range)
=MEDIAN(range)
=AVERAGE(range)
=PERCENTILE(range, k) -- k is 0 to 1 (e.g., 0.25 for 25th percentile)
ROUND Function
=ROUND(value, num_digits) -- e.g., ROUND(12.345, 1) = 12.3
SUMPRODUCT for Weighted Mean
GDP-weighted mean of net exports as % of GDP:
=ROUND(SUMPRODUCT(Exports - Imports) / SUM(GDP) * 100, 1)
This works because:
- weighted_mean = Σ(gdp_i × (exp_i - imp_i)/gdp_i) / Σ(gdp_i) × 100
- Simplifies to: Σ(exp_i - imp_i) / Σ(gdp_i) × 100
- SUMPRODUCT handles the element-wise subtraction and summation
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.
- 3d ago First seen · 32 lines · 31 tokens per session scan A 20f8a4b3ab02
excel-statistics-formulas is a skill published in the GitHub repository cxcscmu/SkillLearnBench (83 stars, last pushed 1mo ago), licensed MIT. It adds 31 tokens to every session and 248 once invoked, about $0.0002 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 2026-09-03.
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