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 openapi/openapi-skills --skill openapi-invoicinggit clone --depth 1 https://github.com/openapi/openapi-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/openapi/openapi-skills/openapi-invoicing)<a href="https://agentmods.dev/skills/openapi/openapi-skills/openapi-invoicing"><img src="https://agentmods.dev/badge/skills/openapi/openapi-skills/openapi-invoicing/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/openapi/openapi-skills/openapi-invoicing"><img src="https://agentmods.dev/badge/skills/openapi/openapi-skills/openapi-invoicing.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 | $0.00072 | $0.00674 |
| Opus 5.5 | $0.00029 | $0.00270 |
| Sonnet 5.5 | $0.00014 | $0.00135 |
| Haiku 4.5 | $0.00007 | $0.00067 |
Grade A, and why
openapi-invoicing 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 1mo 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 — 38 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Openapi invoicing & payments
Bearer token required (see the openapi-auth skill). Sending invoices/receipts to the Revenue Agency and paying bills are irreversible fiscal/financial actions — always confirm with the user first.
Invoice (preferred) — https://invoice.openapi.com
Full management of Italian electronic invoices (FatturaPA XML) and digital receipts.
POST /IT-invoices— create/send an invoice to the SDI;GET /IT-invoices,GET /IT-invoices/{id}— list and monitor states (delivery, rejection)POST /IT-invoices_import— import externally created invoicesPOST|GET|PATCH|DELETE /IT-configurations[/{fiscal_id}]— per-company configuration (signature, legal storage,receipts_authentication)POST /IT-receipts— send a digital receipt;GET|PATCH|DELETE /IT-receipts/{id}(PATCH returns items from a receipt)
Key constraints:
- Receiving supplier invoices requires registering Openapi's Recipient Code on the Revenue Agency website: code PIC7CPS (Invoice API).
- Receipts cannot be sent 23:55–00:00 Italian time (queued to the next day); the receipt service requires enabling third-party credentials on the Agenzia delle Entrate portal (guide: https://docs.openapi.it/Procedura-manuale-per-incarico.pdf). Freelancers/sole proprietorships cannot delegate and must use their own credentials.
SDI (lower-level) — https://sdi.openapi.it
POST /business_registry_configurations(fiscal_id + email; legal-storage registration email follows)POST /api_configurations— set callbacks for notificationsPOST /invoices— send XML invoice; variants/invoices_signature,/invoices_legal_storage,/invoices_signature_legal_storageGET /invoices/{uuid},GET /invoices_download/{uuid},GET /invoices_notifications/{uuid}- Imports:
POST /customer_invoice_imports,POST /supplier_invoice_imports(+_legal_storagevariants); test withPOST /simulate/{type}
Recipient Code for SDI API: JKKZDGR. If the wallet runs dry the configuration is suspended — reactivate with PATCH /business_registry_configurations/{fiscal_id}/activate after recharging. PA invoices are auto-detected and signed.
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.
- 1mo ago First seen · 38 lines · 72 tokens per session scan A d9a00ea6dc06
openapi-invoicing is a skill published in the GitHub repository openapi/openapi-skills (15 stars, last pushed 1mo ago), licensed MIT. It adds 72 tokens to every session and 674 once invoked, about $0.0003 per session on Opus 5.5. 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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