Shinkoku plugin for Grok Build
確定申告自動化 AI エージェントプラグイン — 帳簿管理から e-Tax 入力代行まで
How to install Shinkoku in Grok Build
grok plugin install kazukinagata/shinkoku --trustReview before you trust it. --trust lets this plugin's hooks, MCP servers and scripts run code on your computer. It's a community repo that neither xAI nor GrokStacks has reviewed, so read its code first.
We install this repo directly: Grok Build 1.0.62 can't install it through its own marketplace file. Then start a new Grok session, or press r in /plugins, to load it.
Command format: Grok Build's plugin guide
What we checked: on Oct 18, 2026 it installed with grok 1.0.62 and Grok found 24 skills. That's an install check only: we haven't run it in a live Grok session.
What it contains
Skills (24)
assess— This skill should be used when the user asks to determine what tax filings they need, wants to know if they must file a tax return (確定申告), asks about consumption tax obligations (消費税), or needs help understanding their filing requirements.capabilities— Display shinkoku's current capabilities, supported personas, and known limitations. Use when the user asks "what can you do?", "what's supported?", or similar questions.consumption-tax— This skill should be used when the user needs to calculate consumption tax (消費税) or determine their tax method (2割特例, 簡易課税, or 本則課税). Trigger phrases include: "消費税を計算", "消費税の申告", "消費税申告書", "2割特例", "簡易課税", "本則課税", "課税売上", "消費税額", "インボイス", "みe-bookkeeping-compliance— 優良な電子帳簿の要件チェック・コンプライアンス診断を実行する。 「優良な電子帳簿」「電帳法対応」「電子帳簿の要件確認」 「税務調査の準備」「75万円控除の条件」「帳簿の要件を満たしているか」 「e-bookkeeping compliance」で起動。e-tax— This skill should be used when the user wants to file their tax return electronically via the 確定申告書等作成コーナー (NTA Tax Return Preparation Corner) using Claude in Chrome, Antigravity Browser Sub-Agent, or Playwright CLI (fallback). It guides thfurusato— This skill manages furusato nozei (hometown tax) donations. Use when the user wants to register donation data, read donation receipts, check deduction limits, or manage their furusato nozei records. Trigger phrases: "ふるさと納税", "furusato", "寄gather— This skill should be used when the user needs to know what documents to collect for their tax filing, wants a checklist of required documents, or asks where to obtain specific tax documents. Trigger phrases include: "必要書類", "書類を集める", "何を準備すincome-tax— This skill should be used when the user needs to calculate their income tax (所得税), compute deductions, or import withholding slips. Trigger phrases include: "所得税を計算", "確定申告書を作成", "控除を計算", "源泉徴収票を取り込む", "所得税額", "納付額を計算", "還付額を計算", "第一表", "第二incorporation— 法人成り(個人事業主から法人への移行)に関する相談。税額比較シミュレーション、 法人形態の選択、設立手続き、役員報酬戦略、社会保険の比較を支援する。 Trigger: "法人成り", "会社設立", "法人化", "株式会社にしたい", "合同会社", "法人税と所得税の比較", "役員報酬", "法人成りのタイミング", "マイクロ法人", "1人法人"invoice-system— This skill should be used when the user asks about the invoice system (インボイス制度), qualified invoices (適格請求書), registration numbers (登録番号), input tax credits (仕入税額控除), the 20% special measure (2割特例), the 30% special measure (3割特例), tax-exemptjournal— This skill should be used when the user wants to record bookkeeping entries (仕訳), import transaction data from CSV files, receipts, or invoices, or manage their general ledger. Trigger phrases include: "仕訳を入力", "仕訳登録", "CSVを取り込む", "レシートを読み込reading-deduction-cert— 控除証明書(生命保険料・地震保険料等)の画像を読み取り構造化データを返す。 他のスキルから呼び出されるほか、直接ユーザーが呼び出すことも可能。reading-invoice— 請求書の画像を読み取り構造化データを返す。 他のスキルから呼び出されるほか、直接ユーザーが呼び出すことも可能。reading-payment-statement— 支払調書の画像を読み取り構造化データを返す。 他のスキルから呼び出されるほか、直接ユーザーが呼び出すことも可能。reading-receipt— レシート・領収書・ふるさと納税受領証明書の画像を読み取り構造化データを返す。 他のスキルから呼び出されるほか、直接ユーザーが呼び出すことも可能。reading-withholding— 源泉徴収票の画像を読み取り構造化データを返す。 他のスキルから呼び出されるほか、直接ユーザーが呼び出すことも可能。settlement— This skill should be used when the user needs to perform year-end closing adjustments (決算整理), review financial statements (決算書), compute depreciation, or review their trial balance. Trigger phrases include: "決算", "決算整理", "決算書を作る", "減価償却", "setup— This skill should be used when the user wants to set up shinkoku for the first time, initialize their configuration, or update their existing settings. Trigger phrases include: "セットアップ", "初期設定", "設定ファイルを作る", "shinkokuの設定", "config", "setup"submit— This skill should be used when the user is ready to submit their tax return, needs a final review checklist, wants to know how to submit (e-Tax, mail, or in-person), or asks about common mistakes before submission. Trigger phrases include:tax-advisor— This skill should be used when the user asks tax-related questions, wants advice on deductions or tax savings, or needs expert guidance equivalent to a tax accountant (税理士) or life planner. Trigger phrases include: "税金について教えて", "控除は使える?", "tax-ebookkeeping-context— Background context for the Electronic Bookkeeping Act (電子帳簿保存法) in the shinkoku tax filing plugin. Contains requirements for electronic bookkeeping, scanner storage, mandatory electronic transaction data storage, and shinkoku's compliance stax-housing-loan-context— Background context for housing loan tax credit (住宅ローン控除) in the shinkoku tax filing plugin. Contains eligibility requirements, credit limits, calculation rules, and interaction with furusato-nozei for the current tax year. This skill is nottax-invoice-credit-context— Background context for invoice-system input tax credit rules (仕入税額控除) in the shinkoku tax filing plugin. Contains eligibility requirements, the 6 permanent exceptions (帳簿のみ保存の恒久特例), transitional measures for purchases from tax-exempt businetax-legal-context— Background legal and regulatory context for the shinkoku tax filing plugin. Contains the standard disclaimer about the scope of tax information provided, the relationship to the Tax Accountant Act (税理士法), and tool limitations. This skill is
About this listing
Shinkoku is a community plugin on GitHub by kazukinagata, written as a Claude Code plugin that Grok Build installs. We install-checked it in Grok; we haven't run it in a live session or reviewed its code. When we installed it, Grok found 24 skills. Its license is MIT. We checked commit 607574d5e5ce. It's one of 409 listings in the Development category on GrokStacks.
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Shinkoku FAQ
How do I install Shinkoku in Grok Build?
Run grok plugin install kazukinagata/shinkoku --trust. We install-checked this command in Grok Build. We install this repo directly: Grok Build 1.0.62 can't install it through its own marketplace file. Then start a new Grok session, or press r in /plugins, to load it.
Is Shinkoku an official Grok Build plugin?
No. Shinkoku is a community plugin on GitHub by kazukinagata, not in xAI's official Grok Build marketplace. We checked that it installs and what Grok loads from it, but haven't run it in a live Grok session or reviewed its code.
What does Shinkoku include?
According to what Grok loaded in our install check, Shinkoku includes 24 skills: assess, capabilities, consumption-tax, e-bookkeeping-compliance, e-tax, furusato….
Details
- Type
- Plugin
- Category
- Development
- Source
- Community Claude Code plugin, installs in Grok
- License
- MIT
- Author
- kazukinagata
- Version
- 0.7.0
- Keywords
- agent-skills, bookkeeping, claude-code-plugin, claude-code-skills, japan, python, tax-filing
- Source repo
- https://github.com/kazukinagata/shinkoku
- Checked commit
607574d5e5ce- Checked by GrokStacks
- Install-checked in Grok Build on Oct 18, 2026; not run in a live session
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For maintainers: badge and embeds
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Markdown
[](https://grokstacks.com/p/shinkoku/)HTML
<a href="https://grokstacks.com/p/shinkoku/"><img src="https://grokstacks.com/badge.svg" alt="Listed on GrokStacks" width="164" height="28"></a>Embed card (static HTML and inline CSS, no JavaScript). Preview:
<a href="https://grokstacks.com/p/shinkoku/" style="display:block;max-width:380px;box-sizing:border-box;padding:14px 16px;border:1px solid #2a2e3c;border-radius:12px;background:#0a0b0f;color:#e8eaf0;font:14px/1.45 -apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;text-decoration:none"><span style="display:block;font-size:16px;font-weight:700;color:#e8eaf0">Shinkoku</span><span style="display:block;margin:2px 0 8px;font-size:12px;color:#9aa0b1">Community plugin for Grok Build · 24 skills</span><span style="display:block;margin:0 0 10px;color:#c9cdd8">確定申告自動化 AI エージェントプラグイン — 帳簿管理から e-Tax 入力代行まで</span><span style="font-size:12px;font-weight:600;color:#7c9cff">View on GrokStacks →</span></a>Markdown summary
**[Shinkoku on GrokStacks](https://grokstacks.com/p/shinkoku/)**: Community plugin for Grok Build with 24 skills. Install: `grok plugin install kazukinagata/shinkoku --trust`More on badges, embeds and keeping your listing up to date: GrokStacks for plugin authors.
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