Tax and Social Insurance Cash Calendar Agent Skill

Maps Japanese statutory tax and social insurance payment schedules onto monthly cash flows to detect cash buffer shortfalls.

Context cost
5.7k tokensestimated from the bundle, loaded when it triggers
Bundle
4 files · 48.1 kB1 script among them — read before you run
Licence
MITthe author’s own terms
Last change
—no release on file
Servers it uses
Noneruns standalone

What it does

Map Japanese statutory payment obligations - consumption tax, corporate and local taxes including interim payments, withholding income tax, special-collection resident tax, social insurance, and labour insurance - onto a monthly cash schedule, find the first month an operating cash buffer is breached, and export the obligations as movements for a runway forecast.

What this skill changes about the agent has not been set out here as a list. Its SKILL.md, shown below, says it in the author’s own words.

productivity

The skill itself

A skill is instructions the model reads, so you can see what you are getting: below is the start of its SKILL.md. The front matter loads with every session, the body loads when the skill triggers, and the whole file comes with the install.

SKILL.md5.4 kB · preview
--- name: tax-and-social-insurance-calendar license: MIT metadata: author: ficilcom ---
9# 納税・社会保険の資金繰りカレンダー
10
11利用者が確認した納付義務を月次のキャッシュに載せ、納付が集中する月、最低現金バッファを割る月、必要な資金の最大額を示す。これは資金繰りの準備作業であり、税額の計算、申告方法の判定、料率や納期限の決定、猶予・分割の可否の判断ではない。
12
13## 進め方
14
151. 最初に [インテークと出典](references/intake-and-sources.md) を読み、申告書控え、納付書、口座振替の通知、算定基礎届、年度更新の申告書、給与計算の集計を質問より先に確認する。マイナンバー、口座番号、個人別の給与明細は収集しない。
162. 基準日、通貨、見通し月数、決算期、課税事業者区分、納期の特例の適用状況を一つに固定する。[事業者プロフィール](references/intake-and-sources.md#事業者プロフィール) の各項目が、どの納付区分を想定するかを変える。
173. 税率、料率、納期限、中間申告の要否と回数、納期の特例の可否を、記憶やスクリプトから決めない。[当日確認チェックリスト](references/intake-and-sources.md#当日確認チェックリスト) に従って一次情報で確認し、確認日、様式の版、出典を [出典台帳](references/intake-and-sources.md#情報区分と出典台帳) に残す。
184. 各納付を confirmed、reported、estimated、unknown に区別する。確定額と概算額を合算しない。金額が不明な納付を0として扱わない。
195. [計算契約](references/calendar-and-report.md#計算契約) に従い、必要最小限に匿名化したJSONをスキル外へ置き、スキルのルートで python3 scripts/build_tax_calendar.py <input.json> を実行する。出力は資金繰りの見通しであり、納付や口座振替の設定を行わない。
206. [不確定の扱い](references/calendar-and-report.md#不確定の扱い) に従い、どの月まで残高を信頼できるかを確認する。不明な納付額より後の月の残高は結論に使わない。全社の資金繰りに組み込む場合は [cash-runway-plannerへの接続](references/calendar-and-report.md#cash-runway-plannerへの接続) に従い、二重計上を排除する。
217. バッファ割れが出た場合は [バッファ割れへの対応順序](references/calendar-and-report.md#バッファ割れへの対応順序) に沿って手段を検討し、[報告書形式](references/calendar-and-report.md#報告書形式) に従って、納付の山、割れる月と不足額、確認すべき事項、期限のある行動を示す。
22
23## 判断上の制約
24
25- 税率、料率、納期限、中間納付の要否と回数、納期の特例の可否を推測しない。当日の一次情報で確認し、確認日と出典を残す。確認できないものは unknown のままにする。
26- unknown を0に置き換えない。金額が不明な納付を含む月と、それ以降の月の残高は計算せず null とする。どの月まで判定できるかを必ず併記する。
27- バッファ割れは警戒事象であり、支払不能の判定でも、納付を遅らせてよい根拠でもない。
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md170 words
Files4
LicenceMIT
Why you can read it

Nothing in a skill executes. The client loads the text and the model follows it, so a skill can be audited the way a runbook is — by reading it.

What it costs in context

Skills are not billed by the call. They are paid for in context: every token the instructions occupy is a token your code, your diff and your conversation cannot use. Here is what this one takes and when it takes it.

≈180
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
5,545
on trigger
The instruction body and 3 supporting files, read only when the skill fires.
2.9%
of a 200k window
Ten skills this size would take about 29% of the window before you open a file.
050k100k150k200k context window

5.7k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Heavy. Teams tend to install this one per project rather than globally, and load it only when the job comes up.

Servers bill, skills cost

A server charges by the month. A skill charges once per session, in context, and then keeps charging it for as long as the session lives.

Before and after

The same question, put to the same model twice: once as it comes, and once with these instructions loaded.

No worked example has been published for this skill yet.

The procedure it runs

The procedure has not been set out here step by step. It is in the body of its SKILL.md: the start of it is shown above, and the whole file comes with the install.

Prose, not code

These steps are written for a model to follow, not executed by a runtime. It can still be told to skip one, and it will say so when it does.

Servers it uses

None. This skill calls no MCP servers at all.

Everything it needs is in the instructions, so it works in a project with nothing connected — the model reads the file and changes how it works with what it can already reach.

Its SKILL.md does not declare which tools it asks the agent for, so what it touches is whatever the instructions themselves ask for — read them before you install it.

What it asks for
Writes filesnot declared
Network accessnot declared

This SKILL.md carries no allowed-tools line, so neither is declared. A skill grants no permissions of its own — it can only ask for tools your client already has.

What it will not do

Every skill is narrow, and the useful ones say where they stop. These are the jobs this one is the wrong tool for.

What this skill is not for has not been published here. Nothing is implied by that: it is a section the author has not filled in.

What is in the bundle

4 files, 48.1 kB on disk. Mostly text — the instructions the model reads — with 1 script in it that your client would run only if the instructions tell it to.

  • SKILL.md5.4 kB
  • references/calendar-and-report.md10.7 kB
  • references/intake-and-sources.md6.8 kB
  • scripts/build_tax_calendar.py25.2 kB
What is not in it

A skill installs nothing and depends on nothing: it is a folder your client reads. This one carries 1 script beside the text, so the bundle is 4 files you can review in full before installing. The MIT licence covers the templates and examples as well as the instructions.

Install

Installing copies the bundle into your project. Nothing runs at install time — the files sit on disk until the model reads them.

# Tax and Social Insurance Cash Calendar · 5.7k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/tax-and-social-insurance-cash-calendar/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/tax-and-social-insurance-cash-calendar" ] && { [ ! -e .claude/skills/tax-and-social-insurance-cash-calendar ] || { mv .claude/skills/tax-and-social-insurance-cash-calendar "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/tax-and-social-insurance-cash-calendar" .claude/skills/ && echo "Installed .claude/skills/tax-and-social-insurance-cash-calendar"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add ficilcom/tax-and-social-insurance-cash-calendar

Windows PowerShell says 'running scripts is disabled on this system'? Run Set-ExecutionPolicy -Scope CurrentUser RemoteSigned once, or type npx.cmd instead of npx (codex.cmd, gemini.cmd, grok.cmd likewise). PowerShell 7 needs neither. Writes to .claude/skills/tax-and-social-insurance-cash-calendar/ in the current project. For every project instead, run mkdir -p ~/.claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/tax-and-social-insurance-cash-calendar/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/tax-and-social-insurance-cash-calendar" ] && { [ ! -e ~/.claude/skills/tax-and-social-insurance-cash-calendar ] || { mv ~/.claude/skills/tax-and-social-insurance-cash-calendar "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/tax-and-social-insurance-cash-calendar" ~/.claude/skills/ && echo "Installed ~/.claude/skills/tax-and-social-insurance-cash-calendar" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/tax-and-social-insurance-cash-calendar/ only after the download succeeds, so files left there by another skill of the same name, or by an older release, do not mix in. A copy already there is moved aside, not deleted, and the line prints where. It appears as tax-and-social-insurance-calendar in Gemini CLI, Codex, Copilot and Grok (its own name); Claude Code lists it by the folder name, tax-and-social-insurance-cash-calendar.

Which clients pick it up on their own

A skill is a folder of text. Most of these read a skills folder and pick it up without being told; the rest take the same folder another way — an upload in the app, a parameter on an API call — and then choose it by its description just the same.

Claude Code.claude/skills/
Claude DesktopCustomize › Skills
ChatGPTSkills › Create › Upload
Cursor.cursor/skills/
VS Code.github/skills/
Codex CLI.agents/skills/
Gemini CLI.gemini/skills/
Grok Build.grok/skills/
Microsoft CopilotSkills › Upload a skill
PerplexityComputer › Skills › Upload a skill
DeepSeek Harness.dsh/skills/
Zed.agents/skills/
Devin Desktop.devin/skills/
Windsurf (legacy).windsurf/skills/
OpenAI Agents SDKInstructions or sandbox Skills
HTTP / APIa request parameter
This release
Versionnot versioned
Publishedno release date on file
PriceFree
Referenceficilcom/tax-and-social-insurance-cash-calendar

Versions

Its author publishes no version number, so there is nothing here to pin to: what you install is the folder as it stands today. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

Pinning

Nothing to pin to: this skill carries no version number of its own. What you install is what the folder holds on the day you install it.

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