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 wcs-cart-checkout-couponsgit 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/wcs-cart-checkout-coupons)<a href="https://agentmods.dev/skills/lonsdale201/wp-agent-skills/wcs-cart-checkout-coupons"><img src="https://agentmods.dev/badge/skills/lonsdale201/wp-agent-skills/wcs-cart-checkout-coupons/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/wcs-cart-checkout-coupons"><img src="https://agentmods.dev/badge/skills/lonsdale201/wp-agent-skills/wcs-cart-checkout-coupons.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00115 | $0.02566 |
| Opus 5 | $0.00057 | $0.01283 |
| Sonnet 5 | $0.00023 | $0.00513 |
| Haiku 4.5 | $0.00012 | $0.00257 |
Grade A, and why
wcs-cart-checkout-coupons 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 — 178 lines — stays where its author put it; the contents beside it link to each section on GitHub.
WooCommerce Subscriptions cart, checkout, and coupons
Treat the initial charge and every recurring schedule as separate totals calculations. Let WCS build those calculations; extend them through Woo/WCS hooks instead of copying product meta into custom price arithmetic.
Start with the correct layer
| Need | Correct layer |
|---|---|
| Change a product's subscription schedule or plan | Product/APFS APIs; use wcs-subscription-plans-apfs. |
| Discount recurring product amounts | Persisted recurring_fee or recurring_percent coupon. |
| Discount only the sign-up fee | sign_up_fee or sign_up_fee_percent coupon. |
| Preserve an existing renewal order's historical discount while paying it | WCS renewal-cart reconstruction and its internal pseudo coupon. |
| Add a recurring fee | Add a normal Woo fee, then classify the exact fee through woocommerce_subscriptions_is_recurring_fee. |
| Show headless recurring totals | Read WCS's Store API extension; do not calculate schedules in JavaScript. |
| Add an unrelated Woo coupon type or virtual entitlement | Use wc-coupon-types-rules or wc-coupon-dynamic. |
Respect the two-level cart model
The master WC_Cart calculates the amount due now. WCS groups subscription items by recurring schedule and stores cloned, calculated carts in WC()->cart->recurring_carts.
WC_Subscriptions_Cart::get_calculation_type()isnonefor the initial cart andrecurring_totalwhile a recurring clone is being calculated.- A cart can contain multiple recurring carts when products have different billing interval, period, trial, length, or first-payment dates.
- Recurring carts are derived runtime projections. Do not persist or mutate them as business records.
- Do not assume they exist before
calculate_totals()has completed. - Totals callbacks can run many times and recursively for cloned carts. Keep callbacks deterministic, scoped, and idempotent.
For a read-only integration, consume calculated values. For a pricing integration, hook the normal Woo calculation pipeline and explicitly decide whether the rule applies to the initial calculation, recurring calculations, or both.
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.
- 9d ago First seen · 178 lines · 115 tokens per session scan A a8a5b08b1c8d
wcs-cart-checkout-coupons is a skill published in the GitHub repository Lonsdale201/wp-agent-skills (22 stars, last pushed 2d ago), licensed MIT. It adds 115 tokens to every session and 2,566 once invoked, about $0.0006 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.
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