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 shipping-rate-calculatorgit 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/shipping-rate-calculator)<a href="https://agentmods.dev/skills/finsilabs/awesome-ecommerce-skills/shipping-rate-calculator"><img src="https://agentmods.dev/badge/skills/finsilabs/awesome-ecommerce-skills/shipping-rate-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/finsilabs/awesome-ecommerce-skills/shipping-rate-calculator"><img src="https://agentmods.dev/badge/skills/finsilabs/awesome-ecommerce-skills/shipping-rate-calculator.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 | $0.00031 | $0.02730 |
| Opus 5 | $0.00015 | $0.01365 |
| Sonnet 5 | $0.00006 | $0.00546 |
| Haiku 4.5 | $0.00003 | $0.00273 |
Grade A, and why
shipping-rate-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 12d 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 — 225 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Shipping Rate Calculator
Overview
Showing real-time shipping rates at checkout — from UPS, FedEx, USPS, DHL — lets customers choose their preferred service and prevents you from under- or overcharging for shipping. Every major platform supports carrier-calculated rates natively or through apps, and a multi-carrier rate shopping tool can save you 15–40% on shipping costs by automatically selecting the cheapest option.
When to Use This Skill
- When adding real-time carrier rate quotes to checkout
- When building a multi-carrier shipping rate comparison feature
- When implementing free shipping thresholds or tiered flat-rate shipping
- When you need to calculate dimensional weight for accurate carrier pricing
- When setting up shipping zones and rate tables for international shipping
Core Instructions
Step 1: Determine your platform and choose the right shipping rate tool
| Platform | Recommended Tool | Why |
|---|---|---|
| Shopify | Shopify Shipping (built-in) or Easyship / ShipStation for rate shopping | Shopify Shipping gives discounted USPS, UPS, DHL rates; Easyship adds 250+ carrier options and rate shopping |
| WooCommerce | WooCommerce Shipping (USPS/DHL) + Table Rate Shipping for custom rules | WooCommerce Shipping handles basic carrier rates; Table Rate Shipping adds weight/zone-based rule tables |
| BigCommerce | ShipperHQ or Easyship | ShipperHQ is the most powerful rate management tool for BigCommerce with dimensional rate calculation |
| Custom / Headless | EasyPost or Shippo as a carrier meta-API | Both aggregate UPS, FedEx, USPS, DHL into a single API call — far simpler than integrating each carrier directly |
Step 2: Set up carrier-calculated rates
Shopify
Shopify Shipping (built-in, free, recommended starting point):
- Go to Settings → Shipping and delivery → Manage rates
- Under your domestic zone, click Add rate
- Select Use carrier or app to calculate rates
- Choose from: USPS, UPS, DHL Express
- Check the services you want to offer (e.g., USPS Priority Mail, USPS Ground Advantage, UPS Ground, UPS 2nd Day Air)
- Optionally add a markup or discount percentage on top of carrier rates (useful to offset packing material costs)
- Save — rates will now appear dynamically at checkout based on the order's actual weight and destination
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/dimensional-weight-calculation/criteria.json 2.1 KB
- evals/dimensional-weight-calculation/task.md 1.5 KB
- evals/multi-carrier-rate-engine-with-caching-a/criteria.json 2.3 KB
- evals/multi-carrier-rate-engine-with-caching-a/task.md 1.5 KB
- evals/shipping-rules-and-zone-based-rate-table/criteria.json 2.4 KB
- evals/shipping-rules-and-zone-based-rate-table/task.md 1.7 KB
- tile.json 238 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.
- 12d ago First seen · 225 lines · 31 tokens per session scan A da9633d9065d
shipping-rate-calculator is a skill published in the GitHub repository finsilabs/awesome-ecommerce-skills (52 stars, last pushed 6mo ago), licensed MIT. It adds 31 tokens to every session and 2,730 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 2026-08-30.
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