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.
npx skills add kazukinagata/shinkoku --skill e-taxgit clone --depth 1 https://github.com/kazukinagata/shinkokuWrote 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.
[](https://agentmods.dev/skills/kazukinagata/shinkoku/e-tax)<a href="https://agentmods.dev/skills/kazukinagata/shinkoku/e-tax"><img src="https://agentmods.dev/badge/skills/kazukinagata/shinkoku/e-tax/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.
<a href="https://agentmods.dev/skills/kazukinagata/shinkoku/e-tax"><img src="https://agentmods.dev/badge/skills/kazukinagata/shinkoku/e-tax.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk fail
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 | $0.00130 | $0.20392 |
| Opus 5 | $0.00065 | $0.10196 |
| Sonnet 5 | $0.00026 | $0.04078 |
| Haiku 4.5 | $0.00013 | $0.02039 |
Grade A, and why
e-tax 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 12d 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.
How it starts
The opening of the file, as written. The whole thing — 1,482 lines — stays where its author put it; the contents beside it link to each section on GitHub.
e-Tax 電子申告 — ブラウザ自動化による確定申告書等作成コーナー入力
shinkoku で計算した確定申告データを、確定申告書等作成コーナー（https://www.keisan.nta.go.jp/）に Claude in Chrome を使ってブラウザ上で入力・提出するためのスキル。
前提条件
/income-taxスキルで所得税の計算が完了していること/settlementスキルで決算書（PL/BS）の作成が完了していること/consumption-taxスキルで消費税の計算が完了していること（該当者のみ）shinkoku.config.yamlが設定済みであること- ブラウザ自動化ツールがいずれか利用可能であること（下記「ブラウザ自動化方式の選択」参照）
ブラウザ自動化方式の選択
確定申告書等作成コーナーへの入力には、以下の3つの方式がある。
方式 A: Claude in Chrome（推奨）
| 項目 | 内容 |
|---|---|
| 対象環境 | Windows / macOS のネイティブ Chrome |
| 前提 | Claude in Chrome 拡張機能がインストール済み |
| 利点 | OS 検出の問題なし。追加設定不要 |
方式 B: Antigravity Browser Sub-Agent
| 項目 | 内容 |
|---|---|
| 対象環境 | Windows / macOS / Linux（Antigravity IDE） |
| 前提 | Antigravity IDE がインストール済みで browser_subagent ツールが利用可能 |
| 利点 | ネイティブ Chrome を使用するため OS 偽装不要。Linux でも動作 |
方式 C: Playwright CLI（フォールバック）
| 項目 | 内容 |
|---|---|
| 対象環境 | WSL / Linux、または Claude in Chrome・Antigravity が利用できない環境 |
| 前提 | @playwright/cli + Playwright CLI スキル + etax-stealth.js（OS 偽装スクリプト） |
| 制限 | headed モード必須（QR コード認証に物理操作が必要） |
判定ロジック
1. Claude in Chrome のツール（browser_navigate 等）が利用可能か？
→ はい: 方式 A を使用
→ いいえ: 次へ
2. Antigravity の browser_subagent ツールが利用可能か？
→ はい: 方式 B を使用
→ いいえ: 次へ
3. Bash ツールで `playwright-cli` コマンドが利用可能か？
→ はい: 方式 C を使用（headed モードで起動）
→ いいえ: エラー表示
エラーメッセージ:
「確定申告書等作成コーナーへの入力には、Claude in Chrome、
Antigravity Browser Sub-Agent、または Playwright CLI が必要です。
セットアップ方法は README.md の『ブラウザ自動化』セクションを参照してください。」
方式 B 使用時の操作方法
Antigravity の browser_subagent は高レベルなタスク記述で操作する。
各ステップの入力操作を自然言語で記述し、browser_subagent に委任する。
例:
- 「https://www.keisan.nta.go.jp/kyoutu/ky/sm/top_web#bsctrl を開く」
- 「『マイナンバーカードをお持ちですか』で『はい』のラジオボタンをクリック」
- 「name='sonekiKeisansyoFromMonth' の入力欄に '1' を入力」
※ Antigravity はネイティブ Chrome を使用するため、etax-stealth.js による OS 偽装は不要。
方式 C 使用時のセッション開始手順
Playwright CLI でブラウザを開く際の手順:
- 環境変数を設定:
PLAYWRIGHT_MCP_INIT_SCRIPT=skills/e-tax/scripts/etax-stealth.js - ブラウザ起動:
playwright-cli -s=etax open <url> --headed --browser=chrome - 以降のコマンドは
-s=etaxセッション指定で実行
What ships with it
34 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.
- research/00-screen-flow-summary.md 6.4 KB
- research/01-CC-AA-010-提出方法の選択.md 2.4 KB
- research/02-CC-AE-090-作成する申告書等の選択.md 1.9 KB
- research/03-CC-AE-600-マイナポータル連携の選択.md 1.2 KB
- research/04-CC-AA-024-e-Tax事前確認.md 842 B
- research/05-CC-AA-440-QRコード認証.md 1.5 KB
- research/06-kessan-aa0200-決算書一般用の入力.md 6.9 KB
- research/07-kessan-aa0201-売上仕入金額の入力.md 3.4 KB
- research/08-kessan-aa0100-青色申告特別控除の入力.md 3.9 KB
- research/09-kessan-taisyaku-貸借対照表の入力.md 4.9 KB
- research/10-kessan-所得金額の確認.md 1.4 KB
- research/11-kessan-ac0500-住所氏名等の入力.md 4.3 KB
- research/12-kessan-print-印刷.md 2.0 KB
- research/13-kessan-ac0600-データ保存等.md 2.9 KB
- research/14-kessan-expense-detail-pages.md 8.8 KB
- research/30-shotoku-SS-AA-010a-申告する所得の選択等.md 3.2 KB
- research/31-shotoku-SS-CA-010-給与所得の源泉徴収票の入力.md 6.9 KB
- research/32-shotoku-SS-AA-050-収入所得の入力.md 1.1 KB
- research/33-shotoku-SS-AA-070a-控除の入力1.md 1.5 KB
- research/34-shotoku-SS-AA-080-控除の入力2.md 2.2 KB
- research/35-shotoku-SS-AA-090-計算結果の確認.md 2.9 KB
- research/36-shotoku-SS-AC-010a-納付方法等の入力.md 1.6 KB
- research/37-shotoku-SS-AC-020a-財産債務住民税.md 1.9 KB
- research/38-shotoku-SS-AC-030-基本情報の入力.md 3.5 KB
- research/39-shotoku-SS-AC-040-マイナンバーの入力.md 1.1 KB
- research/40-shotoku-SS-AE-010-申告書等の印刷.md 793 B
- research/41-shotoku-SS-AE-110c-印刷後の作業案内.md 1.9 KB
- research/50-shouhi-ac0100-条件判定等.md 2.4 KB
- research/51-shouhi-ac0250-所得区分の選択.md 1.0 KB
- research/52-shouhi-2wari-売上入力.md 2.8 KB
- research/53-shouhi-2wari-計算結果.md 1.5 KB
- research/54-shouhi-kani-route-summary.md 1.3 KB
- research/55-shouhi-ippan-route-summary.md 8.2 KB
- scripts/etax-stealth.js 7.3 KB runs code
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.
- 12d ago First seen · 1,482 lines · 130 tokens per session scan A 22d982efa56a
e-tax is a skill published in the GitHub repository kazukinagata/shinkoku (359 stars, last pushed 2d ago), licensed MIT. It adds 130 tokens to every session and 20,392 once invoked, about $0.0006 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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