Universal tariff calculator for Amazon sellers. Calculate import duties, landed costs, and VAT/GST for any trade route. Supports CN→US, CN→EU, US→EU, EU→US, US→CN and custom origin/destination pairs. Includes Section 301 tariffs, trade agreement rates (USMCA, EVFTA), and HS code lookup. No API key required.
SkillScore68Maintained
Automatic
◆Procurement pack
Last verified 8/20/2026
What it changes
Passed 14 of 21 test cases with the skill, and 11 of 21 without it.
Without skill50%
With skill68%
Checks it passed that the model alone missed
Sets default origin key default_origin to CN.
Specifies execution of command python3 scripts/hs_lookup.py.
Passes JSON parameter object to python3 scripts/calculator.py.
and 2 more in the full report
4 fixed11 passed either way7 still failing0 broke
Pass-rate lift
+18 pp
Tokens
+46%
Agent turns
0%
Response time
-21%
Model gemini-3.6-flashMeasured 8/20/2026v115 of 22 cases passed with skill · 21 comparable
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.
1 of 4
Prompt
Which CLI command initiates the HS code matcher script for a 'bluetooth speaker' product search?
What was checked, without and with the skill
Checked
Without skill
With skill
Invokes python3 scripts/hs_lookup.py with bluetooth speaker query.
Missed
Passed
case-15 · gemini-3.6-flash · 8/20/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.
SKILL.md166 lines3 filesincludes scripts
Tariff Calculator — Amazon 💰
Universal tariff and landed cost calculator for international Amazon sellers.