child-support-calc

child-support-calc is a skill for Claude Code from llamadrive/bengo-toolkit. It costs 85 tokens per session (3,031 once invoked), scanned A, original, MIT.

A calculator for estimating monthly child support or living-cost payments between separated spouses under Japan’s revised 2019 standard tables.

In plain words
What is it for?
Use it to estimate child-support payments after divorce or shared living costs during separation in Japan.
Why use it?
It turns income and child-age details into a consistent reference amount, without treating the result as a court decision.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is python3 skills/_lib/audit.py record --skill child-support-calc --event calc_run --note "種別: {child_support or spousal_support} / 義務者: {name} / 子: {children_coun.

Part of the bengo-toolkit plugin — 15 skills, 25 commands, 3 MCP servers shipped together

Good fit Use it to estimate child-support payments after divorce or shared living costs during separation in Japan.

Compare 6 skills from other repositories ↓
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/llamadrive/bengo-toolkit
agentmods
npx agentmods add skills/llamadrive/bengo-toolkit/child-support-calc

Made for: Claude Code.

Or install bengo-toolkit, the plugin that ships this one along with the rest of its 15 skills, 25 commands, 3 MCP servers.

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 child-support-calc

README.md
[![agentmods](https://agentmods.dev/badge/skills/llamadrive/bengo-toolkit/child-support-calc/github.svg)](https://agentmods.dev/skills/llamadrive/bengo-toolkit/child-support-calc)
Your own site
<a href="https://agentmods.dev/skills/llamadrive/bengo-toolkit/child-support-calc"><img src="https://agentmods.dev/badge/skills/llamadrive/bengo-toolkit/child-support-calc/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 child-support-calc

Your own site · 80×15
<a href="https://agentmods.dev/skills/llamadrive/bengo-toolkit/child-support-calc"><img src="https://agentmods.dev/badge/skills/llamadrive/bengo-toolkit/child-support-calc.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 85 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,031 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 $0.00085 $0.03031
Opus 5 $0.00043 $0.01515
Sonnet 5 $0.00017 $0.00606
Haiku 4.5 $0.00009 $0.00303

Measured 9d ago against content hash 1441378a3b08, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

child-support-calc 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 9d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (calc.py, test_calc.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/child-support-calc/SKILL.md · 227 lines

How it starts

The opening of the file, as written. The whole thing — 227 lines — stays where its author put it; the contents beside it link to each section on GitHub.

養育費・婚姻費用計算(child-support-calc)

令和元年 12 月改定の標準算定方式に基づき、養育費または婚姻費用の目安月額を 決定論的に計算する。東京家裁・大阪家裁の公開している算定表(表1〜表19)と 原理的に一致する計算式を用いる。

重要: 算定表は「目安」であり、家裁調停・審判では事案固有事情(私立学校費・ 再婚・新扶養家族・特別支出等)で修正される。本計算の出力は調停の出発点として の参考値(supported estimate) であり、裁判所の判断を予測するものではない。

前提条件

  • アクティブな matter が設定されていること
  • 義務者(支払義務者)・権利者(請求権者)の年収が判明していること
  • 養育費計算の場合は子の年齢が判明していること

計算対象

  1. 養育費(民法 766 条・877 条): 離婚後に子を監護する親(権利者)が他方(義務者)に請求する子の扶養費
  2. 婚姻費用(民法 760 条): 別居中の夫婦間の生活費分担

ワークフロー

Step 0: workspace の解決

機密スキル実行時、CWD(または親ディレクトリ)の .claude-bengo/ を walk-up で探す。見つからなければ CWD に silently 新規作成する。弁護士が事前に/matter-create のような登録を行う必要はない。

Step 1: 計算種別の確認

ユーザーに以下を確認:

計算するのは「養育費」か「婚姻費用」のどちらか?
  1. 養育費 (child_support)   — 離婚後の子の扶養費
  2. 婚姻費用 (spousal_support) — 別居中の夫婦間の生活費分担

Step 2: 義務者・権利者の年収聴取

項目 確認内容
義務者年収(円) 支払義務者(原則、収入の高い側)の年収
義務者の所得種別 salary(給与所得者)/business(自営業・事業所得)
権利者年収(円) 支払請求側。収入がない場合は 0
権利者の所得種別 salary / business

給与所得者の年収は源泉徴収票の「支払金額」(額面)を使う。自営業者は確定申告書の「事業所得」を使う。

Step 3: 子の情報聴取(養育費の場合)

子一人ずつ年齢を確認する。生活費指数:

  • 0-14 歳: 62
  • 15-19 歳: 85

20 歳以上は原則扶養義務外(民法 877 条)のためエラーとなる。

Step 3.5: 対応範囲外チェック(v3.3.0-iter3〜 必須)

以下のいずれかに該当する場合、本 skill は算定表ベースの目安計算のみを返す ため、調停・審判で実際に決まる額から乖離する可能性が高い旨を明示し、ユーザーに 続行の可否を確認する:

以下のいずれかが当事案に該当するか?

  (a) 私立学校費・大学進学費用・留学費用の上乗せが必要
  (b) 特別な医療費(継続治療・障害児支援等)
  (c) 非典型的な収入構造(複数所得・海外収入・株式譲渡益中心)
  (d) 当事者間の既存合意書・公正証書・過去の調停調書あり
  (e) 再婚・新扶養家族(連れ子・新生児等)あり
  (f) 親権者変更・監護者指定と連動した算定

該当あり → 「本計算は標準算定表のみに基づく目安値。家裁は上記要因で修正する。
         弁護士が事案固有要因を加味して手計算してほしい」と明示のうえ、
         ユーザーが「それでも参考値として計算」と明示的に求めたときのみ実行する。
該当なし → そのまま Step 4 へ進む。

Step 4: 計算実行

計算実行前に監査ログに記録する(法律事務所のコンプライアンス要件):

python3 skills/_lib/audit.py record --skill child-support-calc --event calc_run --note "種別: {child_support or spousal_support} / 義務者: {name} / 子: {children_count}名"

続いて、収集した情報を JSON にまとめて calc.py を呼び出す:

python3 skills/child-support-calc/calc.py calc --pretty --json '<payload>'

Read the full file on GitHub · 227 lines

Files

What ships with it

3 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.

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. 9d ago First seen · 227 lines · 85 tokens per session scan A 1441378a3b08

Subscribe to this mod's changes

child-support-calc is a skill published in the GitHub repository llamadrive/bengo-toolkit (6 stars, last pushed 1mo ago), licensed MIT. It adds 85 tokens to every session and 3,031 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 2026-08-31.

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