A sender for JPK tax files to Poland’s Ministry of Finance gateway. JPK is a structured electronic tax report, such as a VAT register and return, and the tool returns a reference number and UPO, the official receipt confirming submission.

Use it to submit a generated JPK file to the test or production Ministry of Finance gateway and obtain proof of receipt.

It handles the file encryption, upload, status checking, and receipt retrieval required for electronic submission. A dry run lets you inspect the planned submission without contacting the gateway.

jpk-submit — Skill for Claude Code by dithiothreitol

Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo

git clone --depth 1 https://github.com/dithiothreitol/jdg-ksiegowy

agentmods

npx agentmods add skills/dithiothreitol/jdg-ksiegowy/jpk-submit

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/dithiothreitol/jdg-ksiegowy/jpk-submit/github.svg)](https://agentmods.dev/skills/dithiothreitol/jdg-ksiegowy/jpk-submit)

Your own site

<a href="https://agentmods.dev/skills/dithiothreitol/jdg-ksiegowy/jpk-submit"><img src="https://agentmods.dev/badge/skills/dithiothreitol/jdg-ksiegowy/jpk-submit/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/dithiothreitol/jdg-ksiegowy/jpk-submit"><img src="https://agentmods.dev/badge/skills/dithiothreitol/jdg-ksiegowy/jpk-submit.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 157 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,187 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00157	$0.01187
Opus 5	$0.00078	$0.00593
Sonnet 5	$0.00031	$0.00237
Haiku 4.5	$0.00016	$0.00119

Measured 11d ago against content hash fe34074529dd, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

jpk-submit 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 11d 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.

.claude/skills/jpk-submit/SKILL.md · 64 lines

How it starts

The opening of the file, as written. The whole thing — 64 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Wysyłka JPK do bramki MF

Pełny flow: szyfrowanie XML (AES-256-CBC + RSA klucz publiczny MF) → init upload → PUT na Azure Blob → finish → polling status → pobranie UPO.

Wymagane dane

xml-path — ścieżka do pliku JPK (zwykle z data/jpk/JPK_V7M_*.xml lub data/jpk/JPK_EWP_*.xml)

W .env muszą być:

MF_PESEL — PESEL podatnika
MF_PRIOR_INCOME — kwota przychodu z PIT za rok N-2 (dla wysyłki w 2026 → PIT za 2024). Pozycje zgodnie z formularzem PIT-37/28/36/36L. Brak zeznania → 0.
MF_CERT_PATH — ścieżka do klucza publicznego MF (PEM/DER) — pobierz z podatki.gov.pl, sekcja klucze publiczne
MF_ENV=test (domyślnie) lub prod
SELLER_FIRST_NAME, SELLER_LAST_NAME, SELLER_BIRTH_DATE, SELLER_NIP

Wywołanie — DRY-RUN (zalecane przed pierwszą wysyłką)

python3 skills/jpk-submit/scripts/submit.py --xml-path data/jpk/JPK_V7M_2026_04.xml --dry-run

Pokazuje co byłoby wysłane (rozmiar, env, fingerprint danych autoryzujących) bez dotykania bramki.

Wywołanie — wysyłka

python3 skills/jpk-submit/scripts/submit.py --xml-path data/jpk/JPK_V7M_2026_04.xml

Zwraca JSON:

{
  "success": true,
  "reference_number": "20260417-...",
  "status_code": 200,
  "upo_path": "data/upo/UPO_20260417-...bin",
  "mf_env": "test"
}

Polling statusu trwa do 10 minut (interwał 15s). Status 200 = sukces + UPO; 401-420 = błędy MF (zła XSD, certyfikat, autoryzacja).

⚠️ KRYTYCZNE — przed wysyłką na PROD

Najpierw przetestuj na bramce TEST (MF_ENV=test). Bramka prod = e-dokumenty.mf.gov.pl, test = test-e-dokumenty.mf.gov.pl.
Zweryfikuj kwotę przychodu z PIT za rok N-2 — błąd → odrzucenie autoryzacji. Konkretne pozycje: PIT-37 poz. 50/83, PIT-28 poz. 20/22/24/62/73, PIT-36 poz. 67-75/131, PIT-36L poz. 23/25/27/28/33. Brak zeznania = 0. Nie wolno sumować z różnych zeznań.
Sprawdź certyfikat MF — aktualizowany okresowo (ostatnio 18.07.2025). Nieaktualny → init zwróci błąd 404.
Zachowaj UPO — data/upo/UPO_*.bin to dowód złożenia. Bez UPO uznaje się że JPK nie został złożony.
Termin — JPK_V7M do 25-go następnego miesiąca; JPK_EWP do 30.04 następnego roku.

Read the full file on GitHub · 64 lines

Changes

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.

11d ago First seen · 64 lines · 157 tokens per session scan A fe34074529dd

Subscribe to this mod's changes

jpk-submit is a skill published in the GitHub repository dithiothreitol/jdg-ksiegowy (5 stars, last pushed 1mo ago), licensed MIT. It adds 157 tokens to every session and 1,187 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 2026-08-31.

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