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Agent skill

Tax Invoice Credit Context

by kazukinagata in kazukinagata/shinkoku

Background context for invoice-system input tax credit rules (仕入税額控除) in the shinkoku tax filing plugin.

MITAuto-check passedBusiness, Finance & HR

Install Tax Invoice Credit Context

skills CLI
$ npx skills add kazukinagata/shinkoku --skill tax-invoice-credit-context -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install kazukinagata/shinkoku tax-invoice-credit-context --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/kazukinagata/shinkoku.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/tax-invoice-credit-context .claude/skills/tax-invoice-credit-context && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
tax-invoice-credit-context
GitHub stars
365
Token cost
~254 tokens
SKILL.md length
23 words
Files
2 (incl. references)
Skills in repo
24
Repo updated
First seen
Licence
MIT

At a glance

Background context for invoice-system input tax credit rules (仕入税額控除) in the shinkoku tax filing plugin.

  • Works in 5 steps: 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%… → …
  • Tasks that involve Forms and invoices
  • SKILL.md covers 仕入税額控除の情報提供 and 参照ファイル
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Tax Invoice Credit Context is an agent skill from kazukinagata/shinkoku. 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.

Its SKILL.md is about 250 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/input-tax-credit-rules.md`).

It sits in Business, Finance & HR, covering Forms and invoices and Tax preparation. The repository describes itself as: 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. The licence is MIT.

When your agent uses it

  • Tasks that involve Forms and invoices
  • Tasks that involve Tax preparation

Example prompts

  • “/tax-invoice-credit-context”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. 原則（適格請求書＋帳簿の保存）を確認して案内する
  2. 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
  3. 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
  4. 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
  5. 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

What it can do on your machine

Read from SKILL.md and the folder at commit 607574d. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Tax Invoice Credit Context loads about 254 tokens when it runs, and up to ~1.9k if it reads all its reference files. Until then it costs about 109 tokens; SKILL.md has 23 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~109
When it runs · the whole SKILL.md, loaded when a task matches
~254
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.9k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from kazukinagata/shinkoku at commit 607574d, republished under its MIT licence (© kazukinagata). 23 words, ~254 tokens.

Download SKILL.mdSave it as .claude/skills/tax-invoice-credit-context/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
tax-invoice-credit-context
description
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.
user-invocable
false

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:

  1. 原則（適格請求書＋帳簿の保存）を確認して案内する
  2. 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
  3. 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
  4. 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
  5. 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

© kazukinagata, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file (references) in skills/tax-invoice-credit-context of kazukinagata/shinkoku.

  • SKILL.md
  • references/input-tax-credit-rules.md

Open the folder on GitHubat commit 607574d

Compare with similar skills

Tax Invoice Credit Context next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Tax Invoice Credit Context compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Tax Invoice Credit Context this skillkazukinagata/shinkoku365—~254Automated safety check: PassMIT
Invoice Organizerdavila7/claude-code-templates33k12 repos~2.9kAutomated safety check: PassMIT
Tw Einvoice Guideasgard-ai-platform/skills242—~1.4kAutomated safety check: PassMIT
Vat SummaryWellApp-ai/Well345—~535Automated safety check: PassMIT
Pp Quentlimvanhorn/printing-press-library2.1k—~7.8kAutomated safety check: NotesApache-2.0
Kiwi ReceiptsLeoYeAI/openclaw-master-skills2.2k—~5.2kAutomated safety check: PassMIT

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Categories

Questions about Tax Invoice Credit Context

What does Tax Invoice Credit Context do?

Background context for invoice-system input tax credit rules (仕入税額控除) in the shinkoku tax filing plugin. Tax Invoice Credit Context is an agent skill from kazukinagata/shinkoku. Background context for invoice-system input tax credit rules (仕入税額控除) in the shinkoku tax filing plugin.

When should I use Tax Invoice Credit Context?

Tax Invoice Credit Context fits situations like: tasks that involve Forms and invoices; tasks that involve Tax preparation.

How do I install Tax Invoice Credit Context in Claude Code?

Run `npx skills add kazukinagata/shinkoku --skill tax-invoice-credit-context -a claude-code`. Or copy the skill folder (skills/tax-invoice-credit-context in kazukinagata/shinkoku) into .claude/skills/tax-invoice-credit-context in your project. Claude Code loads it when a task matches its description.

How do I install Tax Invoice Credit Context in Codex?

Run `npx skills add kazukinagata/shinkoku --skill tax-invoice-credit-context -a codex`. Or copy the skill folder (skills/tax-invoice-credit-context in kazukinagata/shinkoku) into .agents/skills/tax-invoice-credit-context in your project. Codex loads it when a task matches its description.

Can I use Tax Invoice Credit Context in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add kazukinagata/shinkoku --skill tax-invoice-credit-context -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/tax-invoice-credit-context, .gemini/skills/tax-invoice-credit-context, .github/skills/tax-invoice-credit-context and .opencode/skills/tax-invoice-credit-context in your project.

What does Tax Invoice Credit Context need to run?

SKILL.md names no scripts, command-line tools or credentials: Tax Invoice Credit Context is instructions for the agent only.

Does Tax Invoice Credit Context access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Tax Invoice Credit Context safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Tax Invoice Credit Context use?

Tax Invoice Credit Context is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Tax Invoice Credit Context use?

About 254 tokens (SKILL.md is roughly 1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.7k tokens, read only when the agent opens those files.

What are the alternatives to Tax Invoice Credit Context?

Skills that share tags, products or a category with Tax Invoice Credit Context: Invoice Organizer (davila7/claude-code-templates, 33k stars), Tw Einvoice Guide (asgard-ai-platform/skills, 242 stars), Vat Summary (WellApp-ai/Well, 345 stars) and Pp Quentli (mvanhorn/printing-press-library, 2.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Tax Invoice Credit Context?

kazukinagata (a GitHub user) maintains it in kazukinagata/shinkoku, which has 365 GitHub stars. The repository holds 24 skills in this directory. The repository was last updated on September 9, 2026.

Source: kazukinagata/shinkoku on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.