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インボイス仕入税額控除コンテキスト（Input Tax Credit Context） · kazukinagata | DecimalAI

financeby kazukinagata

インボイス仕入税額控除コンテキスト（Input Tax Credit Context）

kazukinagata/tax-invoice-credit-context

Source kazukinagata/shinkoku ↗License MIT

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 businesses, and storage requirements. This skill is not user-invocable — Claude loads it automatically when responding to input tax credit questions under the invoice system.

NewMaintained

Automatic

Finance & Accounting pack

Last verified 8/21/2026

What it changes

Passed 17 of 22 test cases with the skill, and 17 of 22 without it.

Without skill77%

With skill77%

0 fixed17 passed either way5 still failing0 broke

Pass-rate lift: 0 pp
Tokens: -20%
Agent turns: 0%
Response time: -34%

Model gemini-3.6-flashMeasured 8/21/2026v117 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/kazukinagata-tax-invoice-credit-context/SKILL.md https://app.decimal.ai/s/kazukinagata-tax-invoice-credit-context/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add kazukinagata-tax-invoice-credit-context, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/kazukinagata-tax-invoice-credit-context/ and pins it in .decimal/skills.lock

decimalai skills add kazukinagata-tax-invoice-credit-context

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/kazukinagata-tax-invoice-credit-context/SKILL.md https://app.decimal.ai/s/kazukinagata-tax-invoice-credit-context/SKILL.md

Raw file: /s/kazukinagata-tax-invoice-credit-context/SKILL.md ↗ · machine-readable summary at /s/kazukinagata-tax-invoice-credit-context.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

What's inside

The instructions your model reads when the skill loads.

SKILL.md19 lines2 files

インボイス仕入税額控除コンテキスト（Input Tax Credit Context）

このスキルはインボイス制度における仕入税額控除の要件・例外に関するコンテキストを提供する。

仕入税額控除の情報提供

仕入税額控除に関する回答を行う際は、references/input-tax-credit-rules.md を読み込んで以下を実行する:

原則（適格請求書＋帳簿の保存）を確認して案内する
帳簿のみ保存の恒久特例6類型（公共交通機関・自販機・郵便等）への該当を確認する
免税事業者からの仕入れに係る経過措置の控除率（80%→70%→50%→30%→0%）を案内する
課税売上割合に応じた控除方式（全額控除・個別対応方式・一括比例配分方式）を説明する
保存期間（7年間）と電子取引データ保存の要件を案内する

参照ファイル

ファイル	内容
`references/input-tax-credit-rules.md`	仕入税額控除の原則・帳簿記載要件・恒久特例6類型・経過措置・課税売上割合と控除方式

Track record

Benchmark

17 / 22

test cases passed, vs 17 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

kazukinagata / shinkoku

skills/tax-invoice-credit-context/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1Bundled 1 file

Other skills for the same job

Published skills whose descriptions closely match this one, with their headline benchmark lift.

kazukinagata/tax-ebookkeeping-contextBackground 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 status. This skill is not user-invocable — Claude loads it automatically when responding to electronic bookkeeping compliance questions.Close match+18 pp pass-rate lift

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

What's inside

インボイス仕入税額控除コンテキスト（Input Tax Credit Context）

仕入税額控除の情報提供

参照ファイル

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

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