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 Lonsdale201/wp-agent-skills --skill fluentcart-shipping-taxgit clone --depth 1 https://github.com/Lonsdale201/wp-agent-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/lonsdale201/wp-agent-skills/fluentcart-shipping-tax)<a href="https://agentmods.dev/skills/lonsdale201/wp-agent-skills/fluentcart-shipping-tax"><img src="https://agentmods.dev/badge/skills/lonsdale201/wp-agent-skills/fluentcart-shipping-tax/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/lonsdale201/wp-agent-skills/fluentcart-shipping-tax"><img src="https://agentmods.dev/badge/skills/lonsdale201/wp-agent-skills/fluentcart-shipping-tax.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 | $0.00108 | $0.01112 |
| Opus 5 | $0.00054 | $0.00556 |
| Sonnet 5 | $0.00022 | $0.00222 |
| Haiku 4.5 | $0.00011 | $0.00111 |
Grade A, and why
fluentcart-shipping-tax 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 — 113 lines — stays where its author put it; the contents beside it link to each section on GitHub.
FluentCart shipping and tax
Treat shipping and tax as server-owned checkout calculations. A browser may select an available method and provide an address; it must not decide the method's eligibility, price, tax class, VAT result, or final total.
Read shipping-tax-pipeline.md before adding carrier quotes, destination rules, tax overrides, or reverse charge.
Resolve shipping from the current address
FluentCart stores zones, methods, and classes in its own tables. Use ShippingMethod::getApplicableForCountry() or the shipping module's services so selection zones are post-filtered by their country list and disabled/state- inapplicable methods disappear.
Revalidate a selected method whenever country, state, postal code, cart lines, shipping class, quantity, coupon, or store mode changes. Reject a stale method instead of preserving a client-submitted amount. Keep amounts in integer minor units.
Do not assume there is a stable abstract carrier-gateway SDK in 1.6.0. For live quotes, keep provider calls in an addon-owned service, normalize results into FluentCart's current shipping calculation contract, cache narrowly, enforce timeouts, and retain a deterministic failure/fallback policy.
Calculate tax through TaxCalculator
TaxCalculator resolves the effective product/variation tax class, destination rates, category/store fallbacks, discounts, fees, shipping tax, subscription signup/recurring amounts, inclusive/exclusive behavior, compound rates, and rounding. Do not append tax by editing cart or order totals after this pipeline.
Preserve these invariants:
- product variation overrides take precedence over category/default mappings;
- mixed inclusive/exclusive carts can have tax_behavior 3;
- store-level behavior still governs shipping and fee treatment;
- taxable fees need an explicit tax decision;
- line and aggregate rounding must remain internally reconcilable;
- tax-disabled and zero-rate outcomes are different states.
What ships with it
2 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.
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 · 113 lines · 108 tokens per session scan A 41fa75bd7ca4
fluentcart-shipping-tax is a skill published in the GitHub repository Lonsdale201/wp-agent-skills (22 stars, last pushed 2d ago), licensed MIT. It adds 108 tokens to every session and 1,112 once invoked, about $0.0005 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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