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 ericrisco/rsc-harness --skill invoicinggit clone --depth 1 https://github.com/ericrisco/rsc-harnessWrote 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/ericrisco/rsc-harness/invoicing)<a href="https://agentmods.dev/skills/ericrisco/rsc-harness/invoicing"><img src="https://agentmods.dev/badge/skills/ericrisco/rsc-harness/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/ericrisco/rsc-harness/invoicing"><img src="https://agentmods.dev/badge/skills/ericrisco/rsc-harness/invoicing.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 | $0.00082 | $0.02719 |
| Opus 5 | $0.00041 | $0.01359 |
| Sonnet 5 | $0.00016 | $0.00544 |
| Haiku 4.5 | $0.00008 | $0.00272 |
Grade A, and why
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 5d 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 — 146 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Invoicing — cut the document, run the lifecycle, get paid
You own the billing document and its collection lifecycle: what must be on the page for a tax authority to accept it, how it moves from draft to paid, and how to chase money politely-then-firmly without breaking the law.
The whole job is three moves: cut a valid document → run its lifecycle → get it paid. Skip the validity step and the customer can't deduct the VAT. Skip the lifecycle and you lose track of who owes what. Skip the chase and you work for free.
Route out before you start
This skill answers "make a valid bill and collect it." When the ask is something else, stop and route:
| The ask | Goes to |
|---|---|
| Record a paid invoice in the books, reconcile it to the bank line | ../bookkeeping/SKILL.md |
Wire up the Stripe SDK, keys, or invoice.paid webhook as code |
../stripe/SKILL.md / ../webhooks/SKILL.md |
| Decide what to charge — rate card, margin, price list | ../pricing/SKILL.md |
| Draft the MSA / SOW / engagement terms the invoice bills against | ../contracts/SKILL.md |
| Write the pre-sale pitch that persuades before money is owed | ../proposals/SKILL.md |
| Get a signature on a document | ../e-signature/SKILL.md |
| Runway / P&L / cash-flow cadence | ../finance-ops/SKILL.md |
Sharpest near-miss: "reconcile this paid invoice / record it in the accounts" reads invoicing-shaped but is bookkeeping. The moment money is recorded against the books, it leaves your hands.
Pick the right document first
Before anything, decide which document you are issuing — they use different number sequences and carry different obligations.
| Document | Use when | Number sequence | Creates a payment obligation? |
|---|---|---|---|
| Quote / estimate (presupuesto, pressupost) | Before work starts, to propose a price | Its own quote series (not the invoice series) | No — it is an offer, not a debt |
| Invoice (factura) | Work delivered or goods supplied, money is owed | The continuous invoice series | Yes |
| Proforma | A "please-pay-this" preview that is not yet a tax document | Not the invoice series | No — not a fiscal invoice |
| Credit note / corrective (factura rectificativa) | To cancel or reduce an invoice already sent | Its own corrective series, referencing the original number | Reduces an existing obligation |
What ships with it
7 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.
- 5d ago First seen · 146 lines · 82 tokens per session scan A ac5dcf0dcff5
invoicing is a skill published in the GitHub repository ericrisco/rsc-harness (74 stars, last pushed 2d ago), licensed MIT. It adds 82 tokens to every session and 2,719 once invoked, about $0.0004 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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