A Japanese hometown-tax donation manager for furusato nozei, a system where donations to municipalities can qualify for an income-tax or local-tax deduction. It reads donation receipts, stores donation records, and calculates deduction limits.

Use it to read receipt images, register donations, check deduction limits, and manage documents for furusato nozei.

It helps keep donation information and receipts together and shows how much may be deductible. It also supports checking whether the simplified one-stop filing option applies.

furusato — Skill for Claude Code by kazukinagata

Install

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.

Any agent

npx skills add kazukinagata/shinkoku --skill furusato

Clone the repo

git clone --depth 1 https://github.com/kazukinagata/shinkoku

Made for: Claude Code.

Or install shinkoku, the plugin that ships this one along with the rest of its 24 skills.

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/kazukinagata/shinkoku/furusato/github.svg)](https://agentmods.dev/skills/kazukinagata/shinkoku/furusato)

Your own site

<a href="https://agentmods.dev/skills/kazukinagata/shinkoku/furusato"><img src="https://agentmods.dev/badge/skills/kazukinagata/shinkoku/furusato/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/kazukinagata/shinkoku/furusato"><img src="https://agentmods.dev/badge/skills/kazukinagata/shinkoku/furusato.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 102 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,328 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	$0.00102	$0.03328
Opus 5	$0.00051	$0.01664
Sonnet 5	$0.00020	$0.00666
Haiku 4.5	$0.00010	$0.00333

Measured 2d ago against content hash 5808745f1bea, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

furusato 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 2d 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.

skills/furusato/SKILL.md · 253 lines

How it starts

The opening of the file, as written. The whole thing — 253 lines — stays where its author put it; the contents beside it link to each section on GitHub.

ふるさと納税管理（Furusato Nozei Management）

ふるさと納税の寄附金受領証明書を読み取り、寄附データを管理し、控除額を計算するスキル。

設定の読み込み（最初に実行）

shinkoku.config.yaml を Read ツールで読み込む
ファイルが存在しない場合は /setup スキルの実行を案内して終了する
設定値を把握する:
- db_path: CLI スクリプトの --db-path 引数に使用（CWD基準で絶対パスに変換）
- tax_year: 対象年度
- furusato_receipts_dir: 受領証明書の格納ディレクトリ（任意）

進捗情報の読み込み

設定の読み込み後、引継書ファイルを読み込んで前ステップの結果を把握する。

.shinkoku/progress/progress-summary.md を Read ツールで読み込む（存在する場合）
以下の引継書を Read ツールで読み込む（存在する場合）:
- .shinkoku/progress/01-setup.md
読み込んだ情報を以降のステップで活用する（ユーザーへの再質問を避ける）
ファイルが存在しない場合はスキップし、ユーザーに必要情報を直接確認する

ステップ1: 受領証明書の画像読み取り

1-1. ファイルの確認

import_data.py furusato-receipt --file-path PATH でファイルの存在を確認する。

1-2. 画像の読み取り

重要: 画像の読み取りは対応する reading- スキルに委任する。*

単一の受領証明書の場合

画像ファイルの読み取りには /reading-receipt スキルを使用する。スキルの指示に従い、デュアル検証（2つの独立した読み取り結果の照合）を行って結果を取得する。

結果照合: 両方の読み取り結果から amount, date, municipality_name を比較する

一致の場合: そのまま採用。「2つの独立した読み取りで結果が一致しました」と報告

不一致の場合: ユーザーに元画像パスと両方の結果を提示し、正しい方を選択してもらう:

差異のあるフィールドを明示する
A を採用 / B を採用 / 手動入力の3択を AskUserQuestion で提示する

読み取り結果の ---FURUSATO_RECEIPT_DATA--- ブロックから以下の情報を取得する:

自治体名: 寄附先の市区町村名
都道府県名: 寄附先の都道府県
寄附金額: 円単位の整数
寄附日: YYYY-MM-DD 形式
受領証明書番号: 記載があれば

複数の受領証明書を一括処理する場合

Glob ツールで受領証明書画像の一覧を取得する（例: furusato_receipts/*.jpg, furusato_receipts/*.png）
shinkoku import furusato-receipt --file-path PATH で各ファイルの存在を確認する
画像ファイルの読み取りには /reading-receipt スキルを使用する。スキルの指示に従い、デュアル検証（2つの独立した読み取り結果の照合）を行って結果を取得する。

結果照合: ファイル単位で両方の読み取り結果の amount, date, municipality_name を比較する

一致の場合: そのまま採用。「2つの独立した読み取りで結果が一致しました」と報告

不一致の場合: 不一致のファイルについてユーザーに元画像パスと両方の結果を提示し、正しい方を選択してもらう:
- 差異のあるフィールドを明示する
- A を採用 / B を採用 / 手動入力の3択を AskUserQuestion で提示する
各証明書の結果をまとめてユーザーに提示する

1-3. ユーザーに確認

抽出した情報を一覧表示し、正しいか確認する。修正があればユーザーの入力を反映する。

ステップ2: 寄附データの登録

確認が完了したら furusato.py add で登録する。

shinkoku furusato add --db-path DB --input FILE

Read the full file on GitHub · 253 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.

2d ago Changed · +33 lines 5808745f1bea
12d ago First seen · 220 lines · 102 tokens per session scan A 1cb7cb898bd3

Subscribe to this mod's changes

furusato is a skill published in the GitHub repository kazukinagata/shinkoku (359 stars, last pushed 3d ago), licensed MIT. It adds 102 tokens to every session and 3,328 once invoked, about $0.0005 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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