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 nexscope-ai/Amazon-Skills --skill amazon-shipping-calculatorgit clone --depth 1 https://github.com/nexscope-ai/Amazon-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/nexscope-ai/amazon-skills/amazon-shipping-calculator)<a href="https://agentmods.dev/skills/nexscope-ai/amazon-skills/amazon-shipping-calculator"><img src="https://agentmods.dev/badge/skills/nexscope-ai/amazon-skills/amazon-shipping-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/nexscope-ai/amazon-skills/amazon-shipping-calculator"><img src="https://agentmods.dev/badge/skills/nexscope-ai/amazon-skills/amazon-shipping-calculator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium MCP Rug Pull · line 14 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
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 | $0.00061 | $0.04253 |
| Opus 5 | $0.00030 | $0.02126 |
| Sonnet 5 | $0.00012 | $0.00851 |
| Haiku 4.5 | $0.00006 | $0.00425 |
Grade A, and why
amazon-shipping-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 11d 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 — 369 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Amazon Shipping Calculator 📦
Comprehensive FBA and FBM cost calculator. Optimize fulfillment strategy and minimize shipping expenses.
Installation
npx skills add nexscope-ai/Amazon-Skills --skill amazon-shipping-calculator -g
Usage Examples
FBA cost analysis:
"Calculate FBA costs for my 12x8x4 inch product weighing 2.5 lbs - is FBA profitable vs self-fulfillment?"
Dimensional weight optimization:
"My product dimensions are 15x12x8 inches but only weighs 3 lbs - how can I optimize packaging to reduce FBA fees?"
Storage fee planning:
"I have 500 units in FBA storage for 8 months - what are my storage costs and when should I remove inventory?"
Core Capabilities
1. FBA Cost Calculation & Analysis
- Complete FBA fee breakdown including fulfillment, storage, and additional service fees
- Dimensional weight analysis and packaging optimization recommendations
- Size tier determination and fee structure optimization strategies
- Multi-marketplace fee comparison and cost optimization across regions
2. FBM vs FBA Comparison & Strategy
- Comprehensive cost comparison between FBA and self-fulfillment options
- Break-even analysis and profitability assessment for each fulfillment method
- Hybrid fulfillment strategy development and product-specific recommendations
- Geographic and seasonal fulfillment optimization strategies
3. Storage Management & Optimization
- Storage fee calculation and long-term storage cost analysis
- Inventory aging tracking and removal cost planning
- Seasonal storage optimization and capacity planning strategies
- Inventory performance index (IPI) impact analysis and improvement recommendations
How It Works
Step 1: Cost Analysis & Fee Calculation
Comprehensive fulfillment cost breakdown and fee analysis
Calculate complete fulfillment costs and fee structures:
- Analyze product dimensions, weight, and packaging to determine accurate FBA size tiers and fees
- Calculate all FBA costs including fulfillment fees, monthly storage, long-term storage, and removal fees
- Compare FBA costs against self-fulfillment expenses including packaging, shipping, labor, and overhead costs
- Evaluate multi-marketplace fulfillment costs and identify optimization opportunities across regions
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.
- 11d ago First seen · 369 lines · 61 tokens per session scan A bab904d3d468
amazon-shipping-calculator is a skill published in the GitHub repository nexscope-ai/Amazon-Skills (655 stars, last pushed 16d ago), licensed MIT. It adds 61 tokens to every session and 4,253 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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