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-index-matchgit 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-index-match)<a href="https://agentmods.dev/skills/cxcscmu/skilllearnbench/excel-index-match"><img src="https://agentmods.dev/badge/skills/cxcscmu/skilllearnbench/excel-index-match.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 | $0.00019 | $0.00347 |
| Opus 5 | $0.00010 | $0.00173 |
| Sonnet 5 | $0.00004 | $0.00069 |
| Haiku 4.5 | $0.00002 | $0.00035 |
Grade A, and why
excel-index-match scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
INDEX & MATCH for Two-Condition Lookups in Excel
Pattern: Cross-Sheet Lookup with Two Criteria
When you need to look up a value using both a row identifier and a column identifier (e.g., series code + year), use INDEX/MATCH:
=INDEX(DataRange, MATCH(RowCriteria, RowLookupRange, 0), MATCH(ColCriteria, ColLookupRange, 0))
Example
Given a Data sheet with series codes in column B and years in row 4:
=INDEX(Data!$H$21:$M$40, MATCH($D12, Data!$B$21:$B$40, 0), MATCH(H$9, Data!$H$4:$M$4, 0))
Key Points
- Use
$to lock ranges that shouldn't shift when copying formulas - Lock row criteria column with
$D12(column locked, row relative) - Lock year row with
H$9(column relative, row locked) - The third argument
0means exact match - INDEX range and MATCH ranges must align (same rows/columns)
Openpyxl Implementation
# When writing INDEX/MATCH formulas via openpyxl, use string assignment:
ws['H12'] = '=INDEX(Data!$H$21:$M$40,MATCH($D12,Data!$B$21:$B$40,0),MATCH(H$9,Data!$H$4:$M$4,0))'
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 · 34 lines · 19 tokens per session scan A 18b0cc68ff6b
excel-index-match is a skill published in the GitHub repository cxcscmu/SkillLearnBench (83 stars, last pushed 1mo ago), licensed MIT. It adds 19 tokens to every session and 347 once invoked, about $0.0001 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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