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 norman-finance/norman-mcp-server --skill create-invoicegit clone --depth 1 https://github.com/norman-finance/norman-mcp-serverWrote 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/norman-finance/norman-mcp-server/create-invoice)<a href="https://agentmods.dev/skills/norman-finance/norman-mcp-server/create-invoice"><img src="https://agentmods.dev/badge/skills/norman-finance/norman-mcp-server/create-invoice/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/norman-finance/norman-mcp-server/create-invoice"><img src="https://agentmods.dev/badge/skills/norman-finance/norman-mcp-server/create-invoice.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 | $0.00034 | $0.00389 |
| Opus 5 | $0.00017 | $0.00195 |
| Sonnet 5 | $0.00007 | $0.00078 |
| Haiku 4.5 | $0.00003 | $0.00039 |
Grade A, and why
create-invoice 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.
What it actually says
Help the user create and send an invoice step by step:
-
Identify the client: If a client name is provided in
$ARGUMENTS, calllist_clientsand find the matching client. If ambiguous, ask the user to clarify. If no client exists, offer to create one withcreate_client. -
Gather invoice details: Collect the following information (ask for anything not provided):
- Line items: description, quantity, unit price, VAT rate (default 19% for Germany)
- Invoice date (default: today)
- Due date / payment terms (default: 14 days)
- Any notes or special terms
-
Create the invoice: Call
create_invoicewith all gathered details. Use the correct client_id from step 1. -
Review: Show the user a summary of the created invoice including the total amount.
-
Send: Ask the user if they want to send the invoice now. If yes, call
send_invoiceto email it to the client.
Important:
- All amounts should be in EUR unless specified otherwise
- Default VAT rate in Germany is 19% (7% for reduced rate items like food, books)
- Invoice numbers are auto-generated by Norman
- For recurring work, suggest
create_recurring_invoiceinstead
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 · 37 lines · 34 tokens per session scan A 46a6681a0df3
create-invoice is a skill published in the GitHub repository norman-finance/norman-mcp-server (54 stars, last pushed 2d ago), licensed MIT. It adds 34 tokens to every session and 389 once invoked, about $0.0002 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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