capabilities

capabilities is a skill for Claude Code from kazukinagata/shinkoku. It costs 38 tokens per session (959 once invoked), scanned A, original, MIT.

A reference for shinkoku's supported Japanese tax-return cases, forms, user types, and limits.

In plain words
What is it for?
Use it to check support for sole proprietors, employees with side businesses, consumption tax, deductions, cryptocurrency income, and e-Tax attachment rules.
Why use it?
It shows which tax situations are covered and which are outside its scope, so you can avoid relying on it for unsupported returns.

Skill for Claude Code

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

Part of the shinkoku plugin — 24 skills shipped together

Good fit Use it to check support for sole proprietors, employees with side businesses, consumption tax, deductions, cryptocurrency income, and e-Tax attachment rules.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/kazukinagata/shinkoku/capabilities
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 capabilities
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.

agentmods badge for capabilities

README.md
[![agentmods](https://agentmods.dev/badge/skills/kazukinagata/shinkoku/capabilities/github.svg)](https://agentmods.dev/skills/kazukinagata/shinkoku/capabilities)
Your own site
<a href="https://agentmods.dev/skills/kazukinagata/shinkoku/capabilities"><img src="https://agentmods.dev/badge/skills/kazukinagata/shinkoku/capabilities/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 capabilities

Your own site · 80×15
<a href="https://agentmods.dev/skills/kazukinagata/shinkoku/capabilities"><img src="https://agentmods.dev/badge/skills/kazukinagata/shinkoku/capabilities.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 38 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 959 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 $0.00038 $0.00959
Opus 5 $0.00019 $0.00479
Sonnet 5 $0.00008 $0.00192
Haiku 4.5 $0.00004 $0.00096

Measured 10d ago against content hash de8ecb7825fb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

capabilities 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 10d 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/capabilities/SKILL.md · 66 lines

What it actually says

shinkoku 対応状況

shinkoku が現在対応している申告パターン、帳票種類、既知の制限事項を一覧する。

ペルソナ対応状況

レベル 意味
Full 計算+確定申告書等作成コーナーへの入力代行
Out 対象外(税理士への相談を案内)
ペルソナ レベル 備考
個人事業主(青色申告・一般用) Full メインターゲット。帳簿→決算書→税額計算→作成コーナー入力
会社員+副業(事業所得) Full 源泉徴収票+事業所得の税額計算→作成コーナー入力
給与所得のみ(会社員) Full 還付申告・医療費控除等→作成コーナー入力
消費税課税事業者 Full 2割特例・簡易課税・本則課税すべて対応
ふるさと納税利用者 Full CRUD + 控除計算 + 限度額推定。ワンストップ特例との注意点も案内
住宅ローン控除(初年度) Full 控除額計算。初年度は添付書類が別途必要
医療費控除 Full 明細集計+控除額計算
仮想通貨トレーダー Full 雑所得(総合課税)として申告書に自動反映
株式投資家(分離課税) Out 株式譲渡所得・配当の分離課税には対応していません
FXトレーダー Out 先物取引に係る雑所得等には対応していません
不動産所得 Out 不動産所得用の決算書・申告に対応していません
退職所得 Out 退職所得控除の計算に対応していません
譲渡所得(不動産売却) Out 長期/短期税率、3,000万円特別控除なし
外国税額控除 Out 外国税支払額の追跡・控除計算なし
農業所得・山林所得 Out 専用所得区分なし
非居住者 Out 日本居住者専用

添付書類の省略ルール(e-Tax)

e-Tax で電子申告する場合、以下の添付書類は提出を省略できる(5年間の保存義務あり):

書類 省略可否
源泉徴収票 省略可(記載内容の転記が必要)
生命保険料控除証明書 省略可
地震保険料控除証明書 省略可
医療費の領収書 省略可(明細書の添付が必要)
寄附金受領証明書 省略可
社会保険料控除証明書 省略可

注意: 省略できるのは e-Tax(電子申告)の場合のみ。書面提出の場合は原本の添付が必要。

Out 対応のペルソナへの案内テンプレート

shinkoku では {ペルソナ名} の確定申告には対応していません。

{理由の説明}

以下の対応をお勧めします:
- 税理士への相談
- 国税庁の確定申告書等作成コーナーの利用
  https://www.keisan.nta.go.jp/
Files

What ships with it

1 file 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. 10d ago First seen · 66 lines · 38 tokens per session scan A de8ecb7825fb

Subscribe to this mod's changes

capabilities is a skill published in the GitHub repository kazukinagata/shinkoku (359 stars, last pushed yesterday), licensed MIT. It adds 38 tokens to every session and 959 once invoked, about $0.0002 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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