calendar-sync

calendar-sync is a skill for Claude Code from dithiothreitol/jdg-ksiegowy. It costs 148 tokens per session (768 once invoked), scanned A, original, MIT.

A synchronizer for Polish sole-trader tax deadlines, social-security payments, VAT and JPK filings, and invoice reminders in Google Calendar. JPK is the electronic reporting file used for Polish tax records.

In plain words
What is it for?
Use it to preview or apply calendar changes, including creating, updating, deleting, and leaving unchanged all-day reminders in the “JDG Podatki” calendar.
Why use it?
It keeps one dedicated calendar aligned with changing tax dates, amounts, and unpaid invoices without creating duplicate events.

Skill for Claude Code

Written for Claude Code: installed under .claude/. Also seen: built for openclaw.

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is python3 skills/calendar-sync/scripts/sync.py --dry-run.

Good fit Use it to preview or apply calendar changes, including creating, updating, deleting, and leaving unchanged all-day reminders in the “JDG Podatki” calendar.

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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/calendar-sync

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.

agentmods badge for calendar-sync

README.md
[![agentmods](https://agentmods.dev/badge/skills/dithiothreitol/jdg-ksiegowy/calendar-sync/github.svg)](https://agentmods.dev/skills/dithiothreitol/jdg-ksiegowy/calendar-sync)
Your own site
<a href="https://agentmods.dev/skills/dithiothreitol/jdg-ksiegowy/calendar-sync"><img src="https://agentmods.dev/badge/skills/dithiothreitol/jdg-ksiegowy/calendar-sync/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.

agentmods 80×15 button for calendar-sync

Your own site · 80×15
<a href="https://agentmods.dev/skills/dithiothreitol/jdg-ksiegowy/calendar-sync"><img src="https://agentmods.dev/badge/skills/dithiothreitol/jdg-ksiegowy/calendar-sync.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 148 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 768 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00148 $0.00768
Opus 5 $0.00074 $0.00384
Sonnet 5 $0.00030 $0.00154
Haiku 4.5 $0.00015 $0.00077

Measured 11d ago against content hash f9a929f4aa02, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

calendar-sync 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/calendar-sync/SKILL.md · 51 lines

What it actually says

Synchronizacja terminów podatkowych z Google Calendar

Czyta przypomnienia z dashboardu (status/dashboard.py — terminy podatkowe + niezapłacone/zaległe faktury, z kwotami) i uzgadnia je z kalendarzem „JDG Podatki" przez Google Calendar API. Wydarzenia całodniowe na termin płatności, z popupami N dni przed i w dniu.

Wymagana konfiguracja (jednorazowo)

  1. Google Cloud Console → utwórz OAuth client ID typu „Desktop app", pobierz credentials.json.
  2. W .env: GCAL_ENABLED=true, GCAL_CREDENTIALS_PATH=/sciezka/credentials.json.
  3. python -m jdg_ksiegowy.calendar.auth_setup — jednorazowa zgoda w przeglądarce (zapisuje refresh token).

Jeśli skrypt zwróci błąd „nie skonfigurowany" / „Brak tokenu" — przerwij i poprowadź usera przez powyższe kroki.

Wywołanie

# Podglad (NIC nie zapisuje) — pokaz co by sie zmienilo:
python3 skills/calendar-sync/scripts/sync.py --dry-run

# Synchronizacja:
python3 skills/calendar-sync/scripts/sync.py

Zwraca JSON: created / updated / deleted / unchanged (listy kluczy wydarzeń) + dry_run.

Zachowanie

  • Idempotentne: ponowne uruchomienie bez zmian → wszystko w unchanged.
  • Kwoty się aktualizują: zmiana szacowanej kwoty (np. po dodaniu faktury/kosztu) → updated.
  • Zapłacone faktury znikają: po oznaczeniu faktury jako zapłaconej jej przypomnienie wypada z dashboardu → wydarzenie zostaje usunięte z kalendarza.
  • Dotyka wyłącznie wydarzeń utworzonych przez aplikację (oznaczonych jdg_managed) — nigdy nie rusza prywatnych wpisów usera.

Automatyzacja

Cron OpenClaw odpala to codziennie (patrz CRON.md): 0 7 * * *. Dzięki temu kwoty są świeże, a zapłacone faktury automatycznie znikają.

Uwagi

  • Kwota VAT+JPK jest szacunkowa (należny − naliczony za poprzedni miesiąc); autorytatywna kwota pochodzi ze skilla jpk.
  • Nigdy nie loguj tokenu OAuth do outputu.
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.

  1. 11d ago First seen · 51 lines · 148 tokens per session scan A f9a929f4aa02

Subscribe to this mod's changes

calendar-sync is a skill published in the GitHub repository dithiothreitol/jdg-ksiegowy (5 stars, last pushed 1mo ago), licensed MIT. It adds 148 tokens to every session and 768 once invoked, about $0.0007 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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