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 KirKruglov/claude-skills-kit --skill invoice-and-payment-tracker-summarygit clone --depth 1 https://github.com/KirKruglov/claude-skills-kitWrote 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/kirkruglov/claude-skills-kit/invoice-and-payment-tracker-summary)<a href="https://agentmods.dev/skills/kirkruglov/claude-skills-kit/invoice-and-payment-tracker-summary"><img src="https://agentmods.dev/badge/skills/kirkruglov/claude-skills-kit/invoice-and-payment-tracker-summary/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/kirkruglov/claude-skills-kit/invoice-and-payment-tracker-summary"><img src="https://agentmods.dev/badge/skills/kirkruglov/claude-skills-kit/invoice-and-payment-tracker-summary.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 | $0.00074 | $0.02276 |
| Opus 5 | $0.00037 | $0.01138 |
| Sonnet 5 | $0.00015 | $0.00455 |
| Haiku 4.5 | $0.00007 | $0.00228 |
Grade A, and why
invoice-and-payment-tracker-summary 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.
How it starts
The opening of the file, as written. The whole thing — 189 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Invoice & Payment Tracker Summary
This skill assembles an invoice aging summary from a pasted list of invoices or payments. It classifies each invoice by payment status, calculates overdue aging, builds a per-client reconciliation cross-section, and generates a prioritised "needs action" list — with no accounting SaaS or integrations required.
Input:
- Pasted invoice or payment list (markdown table, CSV, plain text list, or free-form)
- Optional: payment terms (default: net 30), report date, currency label
Output:
- Single markdown document with three sections: Aging Summary / Per-Client Reconciliation / Needs Action
Language Detection
Detect the user's language from their message:
- If Russian (or contains Cyrillic): respond in Russian
- If English (or other Latin-script language): respond in English
- If ambiguous: respond in the language of the trigger phrase used
Instructions
Step 1: Validate Input
-
Check that the user has pasted a list of invoices or payments.
- If input is empty or contains only whitespace: stop and respond: "Вставь список счетов (номер, клиент, дата, сумма, статус). / Paste your invoice list (invoice #, client, date, amount, status)."
- If input looks like a bank statement (contains debit/credit/transaction columns): stop and respond: "Это банковская выгрузка, а не список счетов. Для анализа банковских транзакций используй скилл monthly-close-checklist. / This looks like a bank statement. For transaction analysis, use the monthly-close-checklist skill."
- If the user asks to write a reminder letter or dunning message: redirect: "Этот скилл составляет сводку, а не письма-напоминания. Для серии напоминаний используй accounts-receivable-followup-writer. / This skill builds a status summary, not reminder messages. For a reminder sequence, use accounts-receivable-followup-writer."
-
Identify the report date (use today's date if not provided).
Step 2: Parse Columns and Confirm Mapping
- Identify columns or fields in the input. Look for: Invoice #, Client Name, Invoice Date, Due Date, Amount, Paid Amount or Status.
- If column headers are clear and standard: proceed directly to Step 3.
- If headers are ambiguous, missing, or non-standard (e.g., "Контрагент", "Сумма к оплате", "Дата оплаты"):
- Present a mapping confirmation:
"Я вижу следующие поля: [col1] → Invoice #, [col2] → Client, [col3] → Amount. Верно? / I see these fields: [col1] → Invoice #, [col2] → Client, [col3] → Amount. Correct?"
- Wait for user confirmation before proceeding. Do not generate output until mapping is confirmed.
- Present a mapping confirmation:
What ships with it
4 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.
- 12d ago First seen · 189 lines · 74 tokens per session scan A d4ec2d675821
invoice-and-payment-tracker-summary is a skill published in the GitHub repository KirKruglov/claude-skills-kit (18 stars, last pushed 1mo ago), licensed MIT. It adds 74 tokens to every session and 2,276 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 2026-08-30.
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