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 finsilabs/awesome-ecommerce-skills --skill product-comparisongit clone --depth 1 https://github.com/finsilabs/awesome-ecommerce-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/finsilabs/awesome-ecommerce-skills/product-comparison)<a href="https://agentmods.dev/skills/finsilabs/awesome-ecommerce-skills/product-comparison"><img src="https://agentmods.dev/badge/skills/finsilabs/awesome-ecommerce-skills/product-comparison/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/finsilabs/awesome-ecommerce-skills/product-comparison"><img src="https://agentmods.dev/badge/skills/finsilabs/awesome-ecommerce-skills/product-comparison.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 | $0.00029 | $0.02369 |
| Opus 5 | $0.00015 | $0.01184 |
| Sonnet 5 | $0.00006 | $0.00474 |
| Haiku 4.5 | $0.00003 | $0.00237 |
Grade A, and why
product-comparison 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 — 219 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Product Comparison
Overview
Build a side-by-side product comparison feature where shoppers select 2–4 products and see their attributes in a sticky-header table. Attribute rows that are identical across all selected products can be hidden to reduce noise. The comparison state is stored in the URL so it can be shared or bookmarked.
When to Use This Skill
- When selling products with many technical specifications (electronics, appliances, cameras)
- When conversion research shows shoppers are considering multiple products before purchasing
- When the product catalog has well-structured attribute data that lends itself to comparison
- When building a B2B store where buyers need to justify purchase decisions to stakeholders
- When implementing a "Compare" checkbox on product listing pages
Core Instructions
Step 1: Determine the merchant's platform and choose the right approach
| Platform | Recommended Approach | Why |
|---|---|---|
| Shopify | Install Comparify or Product Compare app (both free tiers available) | Shopify doesn't have built-in comparison; these apps add Compare buttons to product cards, a floating comparison tray, and a full comparison table page; they pull product metafields for spec data |
| WooCommerce | Install YITH WooCommerce Compare (free) or WooCommerce Products Compare | YITH Compare is the most popular free option — adds Compare checkboxes to product cards, a comparison table page using WooCommerce product attributes, and a "show differences only" toggle |
| BigCommerce | Enable the built-in Compare feature in Storefront → My Themes → Customize (Cornerstone theme) | BigCommerce and Cornerstone include native product comparison — enable it in the Theme Editor; it uses product custom fields as comparison attributes |
| Custom / Headless | Build a URL-state comparison tray + comparison table page with your product attribute data | Full control over attribute display, difference highlighting, and table layout; see implementation below |
What ships with it
7 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.
- evals/accessible-comparison-table-with-attribu/criteria.json 3.4 KB
- evals/accessible-comparison-table-with-attribu/task.md 3.5 KB
- evals/compare-checkboxes-and-floating-comparis/criteria.json 3.1 KB
- evals/compare-checkboxes-and-floating-comparis/task.md 2.4 KB
- evals/url-state-management-and-attribute-norma/criteria.json 3.1 KB
- evals/url-state-management-and-attribute-norma/task.md 3.3 KB
- tile.json 229 B
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 · 219 lines · 29 tokens per session scan A e780a9f1b789
product-comparison is a skill published in the GitHub repository finsilabs/awesome-ecommerce-skills (52 stars, last pushed 6mo ago), licensed MIT. It adds 29 tokens to every session and 2,369 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.
Other skills, from other repositories
fix-visual-stability
Fix visual stability issues in Next.js e-commerce apps — covers CLS (Cumulative Layout Shift), FOIT (Flash of Invisible Text), and theme flicker.
anti-ui-slop
Stop coding agents from shipping generic UI. Extend the product's design system, use UIZZE evidence only when useful, cover required states, and inspect the rendered result.
shopify-theme-optimization
Theme speed and UX optimization — Core Web Vitals, Liquid code, image loading, mobile responsiveness.
image-compare
Compare two image files on disk and report what changed, region by region. Trigger on "what changed between these two images", "diff these PNGs", "did this render drift", "compare screenshots/exports/renders".
shopify
Expert Shopify theme development guidelines for Liquid, Online Store 2.0, CSS, JavaScript, and UX best practices.
shopify-theme-development-guidelines
Expert Shopify theme development with Liquid, Online Store 2.0, and performance best practices.