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 szamlazzhu-vat-checkout-compatibilitygit 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/szamlazzhu-vat-checkout-compatibility)<a href="https://agentmods.dev/skills/lonsdale201/wp-agent-skills/szamlazzhu-vat-checkout-compatibility"><img src="https://agentmods.dev/badge/skills/lonsdale201/wp-agent-skills/szamlazzhu-vat-checkout-compatibility/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/szamlazzhu-vat-checkout-compatibility"><img src="https://agentmods.dev/badge/skills/lonsdale201/wp-agent-skills/szamlazzhu-vat-checkout-compatibility.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 | $0.00169 | $0.04052 |
| Opus 5 | $0.00084 | $0.02026 |
| Sonnet 5 | $0.00034 | $0.00810 |
| Haiku 4.5 | $0.00017 | $0.00405 |
Grade A, and why
szamlazzhu-vat-checkout-compatibility 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 yesterday.
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 — 326 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Szamlazz.hu VAT/Checkout Compatibility
Use this skill when a plugin/theme must cooperate with the Szamlazz.hu WooCommerce VAT/tax-number workflow. The goal is one source of truth for company billing and VAT data, so invoices, checkout validation, customer addresses, subscription renewals, admin orders, and Store API checkout all agree.
The plugin's VAT feature loads only when its vat_number_type option is not no. Guard your integration for sites where the Szamlazz.hu VAT UI is disabled.
Version 6.2 added the "VAT number for all countries" path and made wc_szamlazz_vat_number_validation_results run for invalid VAT results too. Version 6.2.2 further adjusts EU VAT validation behavior. This skill was rechecked against the local 6.2.2 source and WooCommerce 10.9.4.
When to use this skill
Trigger when ANY of these are true:
- Adding or auditing a WooCommerce B2B/company billing field.
- Mapping another plugin's VAT number into Szamlazz.hu invoices.
- Supporting classic checkout and Checkout Blocks/Store API with the same VAT state.
- Debugging required VAT/company validation, EU VAT exemption, or VIES/NAV validation.
- The code touches
wc_szamlazz_adoszam,_billing_wc_szamlazz_adoszam,_wc_szamlazz_adoszam_data,wc-szamlazz-vat-number,wc_szamlazz_xml_adoszam,wc_szamlazz_vat_number_validation_results, orwoocommerce_store_api_checkout_update_order_from_request.
Canonical data contract
| Surface | Key/namespace | Meaning |
|---|---|---|
| Classic checkout POST field | wc_szamlazz_adoszam |
Shopper-entered HU tax number or EU VAT number. |
| Company toggle field | wc_szamlazz_company_toggle |
Checkbox mode, when configured. |
| Company radio field | wc_szamlazz_company_toggle_radio |
individual or company, when configured. |
| Order meta | _billing_wc_szamlazz_adoszam |
Canonical order VAT/tax number used for invoices. |
| Legacy order meta | wc_szamlazz_adoszam |
Backward compatibility; plugin migrates/read-falls back. |
| Order meta | _wc_szamlazz_adoszam_data |
Validation payload from NAV/VIES. |
| User meta | wc_szamlazz_adoszam |
Saved billing VAT number for logged-in customers. |
| Store API namespace | wc-szamlazz-vat-number |
Checkout Blocks/cart extension state. |
| Cart extensions update data | vat_number |
POST /wc/store/v1/cart/extensions update callback input. |
| Checkout extension data | customer_type, billing_vat_number, billing_vat_number_info |
Final checkout payload saved to order meta. |
| WC session | vat-number-data |
Current Store API/classic AJAX validation state. |
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.
- yesterday Changed · -2 lines bff92d7ee8b7
- 9d ago First seen · 328 lines · 169 tokens per session scan A b0993b2e0dc0
szamlazzhu-vat-checkout-compatibility is a skill published in the GitHub repository Lonsdale201/wp-agent-skills (22 stars, last pushed 2d ago), licensed MIT. It adds 169 tokens to every session and 4,052 once invoked, about $0.0008 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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