Ar Aging
WellApp-ai/Well
Produce an accounts-receivable aging report and surface overdue invoices for a Well workspace.
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)…
Install Invoice System
$ npx skills add kazukinagata/shinkoku --skill invoice-system -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install kazukinagata/shinkoku invoice-system --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/kazukinagata/shinkoku.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/invoice-system .claude/skills/invoice-system && rm -rf skills-srcUse ~/.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/
Install the "invoice-system" agent skill from https://github.com/kazukinagata/shinkoku/tree/main/skills/invoice-system into .claude/skills/invoice-system/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "invoice-system", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/kazukinagata/shinkoku/tree/main/skills/invoice-systemType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add kazukinagata/shinkoku --skill invoice-system -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install kazukinagata/shinkoku invoice-system --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kazukinagata/shinkoku.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/invoice-system .agents/skills/invoice-system && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "invoice-system" agent skill from https://github.com/kazukinagata/shinkoku/tree/main/skills/invoice-system into .agents/skills/invoice-system/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "invoice-system", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add kazukinagata/shinkoku --skill invoice-system -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install kazukinagata/shinkoku invoice-system --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kazukinagata/shinkoku.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/invoice-system .cursor/skills/invoice-system && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "invoice-system" agent skill from https://github.com/kazukinagata/shinkoku/tree/main/skills/invoice-system into .cursor/skills/invoice-system/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "invoice-system", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/kazukinagata/shinkoku.git --path skills/invoice-system--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add kazukinagata/shinkoku --skill invoice-system -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install kazukinagata/shinkoku invoice-system --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kazukinagata/shinkoku.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/invoice-system .gemini/skills/invoice-system && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "invoice-system" agent skill from https://github.com/kazukinagata/shinkoku/tree/main/skills/invoice-system into .gemini/skills/invoice-system/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "invoice-system", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install kazukinagata/shinkoku invoice-systemInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add kazukinagata/shinkoku --skill invoice-system -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/kazukinagata/shinkoku.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/invoice-system .github/skills/invoice-system && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "invoice-system" agent skill from https://github.com/kazukinagata/shinkoku/tree/main/skills/invoice-system into .github/skills/invoice-system/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "invoice-system", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add kazukinagata/shinkoku --skill invoice-system -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install kazukinagata/shinkoku invoice-system --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kazukinagata/shinkoku.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/invoice-system .opencode/skills/invoice-system && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "invoice-system" agent skill from https://github.com/kazukinagata/shinkoku/tree/main/skills/invoice-system into .opencode/skills/invoice-system/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "invoice-system", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
invoice-system- GitHub stars
- 365
- Token cost
- ~778 tokens
- SKILL.md length
- 122 words
- Files
- 8 (incl. references)
- Skills in repo
- 24
- Repo updated
- First seen
- Licence
- MIT
At a glance
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)…
- Works in 5 steps: 結論（Answer） → 根拠（Legal Basis） → 計算例（Calculation Example） → …
- Asks about the invoice system (インボイス制度)
- SKILL.md covers 制度概要, クイックリファレンス, リファレンスファイル参照ガイド and 回答パターン, plus 2 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Invoice System is an agent skill from kazukinagata/shinkoku. 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-exempt businesses (免税事業者), transitional measures (経過措置), small-amount exceptions (少額特例), corrected invoices (修正インボイス), or any related topics. Trigger phrases include: "インボイス", "適格請求書", "登録番号", "仕入税額控除", "2割特例", "3割特例", "免税事業者", "経過措置", "少額特例", "修正インボイス", "返還インボイス", "簡易インボイス"…
Its SKILL.md is about 780 tokens, which your agent loads only when the skill is triggered. The skill folder holds 8 other files, including reference files (for example `references/btoc-and-pricing-strategy.md`, `references/common-pitfalls.md` and `references/decision-flowchart.md`).
It sits in Documents & Office, covering Forms and invoices. 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
- 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)
Example prompts
- “仕入税額控除”
- “修正インボイス”
- “返還インボイス”
- “/invoice-system”
Workflow steps
5 steps, taken from the step headings in SKILL.md.
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
Invoice System loads about 778 tokens when it runs, and up to ~16k if it reads all its reference files. Until then it costs about 139 tokens; SKILL.md has 122 words of instructions outside code blocks.
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). 122 words, ~778 tokens.
Download SKILL.mdSave it as
.claude/skills/invoice-system/SKILL.md (or your agent's skills folder). This skill also uses 7 other files; get the full folder from GitHub.- name
- invoice-system
- description
- 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-exempt businesses (免税事業者), transitional measures (経過措置), small-amount exceptions (少額特例), corrected invoices (修正インボイス), or any related topics. Trigger phrases include: "インボイス", "適格請求書", "登録番号", "仕入税額控除", "2割特例", "3割特例", "免税事業者", "経過措置", "少額特例", "修正インボイス", "返還インボイス", "簡易インボイス", "インボイス登録", "T番号", "適格請求書発行事業者".
インボイス制度（Invoice System）
適格請求書等保存方式（インボイス制度）に関する包括的な知識ベース。 制度の概要、記載要件、経過措置、仕入税額控除ルール、登録判断を支援する。
制度概要
インボイス制度（適格請求書等保存方式）は、令和5年（2023年）10月1日に開始された消費税の仕入税額控除に関する制度。課税事業者が仕入税額控除を受けるためには、原則として「適格請求書発行事業者」が発行する「適格請求書（インボイス）」の保存が必要となる。適格請求書発行事業者になるには税務署への登録申請が必要で、登録番号（T+13桁）が付与される。
令和8年度税制改正大綱（R7.12.26閣議決定）により、3割特例の新設、経過措置スケジュールの5段階化など大幅な変更がある。
クイックリファレンス
登録番号の形式
- T + 13桁の数字
- 法人: T + 法人番号（例: T1234567890123）
- 個人: T + 固有番号（マイナンバーとは異なる）
適格請求書の6つの必須記載事項
- 発行事業者の氏名又は名称及び登録番号
- 取引年月日
- 取引内容（軽減税率対象品目の明示含む）
- 税率ごとに区分した対価の額及び適用税率
- 税率ごとに区分した消費税額等
- 受領者の氏名又は名称
現行の経過措置一覧（令和7年時点）
| 措置 | 内容 | 適用期限 |
|---|---|---|
| 2割特例 | 売上消費税額の20%を納付 | R8.9.30を含む課税期間まで |
| 免税事業者仕入控除 | 80%→70%→50%→30%→0% | R11.10.1で完全移行 |
| 少額特例 | 税込1万円未満はインボイス不要 | R11.9.30まで |
| 少額返還インボイス免除 | 税込1万円未満は返還インボイス不要 | 恒久措置 |
消費税額の端数処理
- 1インボイスにつき、税率ごとに1回の端数処理
- 切捨て・切上げ・四捨五入いずれも可（事業者の選択）
- 行ごとの端数処理は不可
リファレンスファイル参照ガイド
質問の内容に応じて、以下のリファレンスファイルを参照する:
| 質問カテゴリ | 参照ファイル |
|---|---|
| 適格請求書の記載事項・種類・端数処理 | references/qualified-invoice-requirements.md |
| 経過措置のスケジュール・控除率・期限 | references/transitional-measures-timeline.md |
| 仕入税額控除の要件・例外・保存ルール | /tax-invoice-credit-context を実行する |
| 登録すべきか・計算方法の選択 | references/decision-flowchart.md |
| 実務上のよくある間違い・注意点 | references/common-pitfalls.md |
| 登録申請・取消手続き・基準期間 | references/registration-procedures.md |
| BtoC事業者の判断・価格戦略 | references/btoc-and-pricing-strategy.md |
| その他の質問・特定状況 | references/faq.md |
回答パターン
ユーザーの質問に回答する際は、以下の構造に従う:
1. 結論（Answer）
質問に対する明確な回答を最初に提示する。
2. 根拠（Legal Basis）
関連する法令・通達を示す。例:
- 「消費税法第57条の4に基づき、適格請求書の交付義務があります」
- 「R8大綱により、R9年分から3割特例が新設されます（個人事業主のみ）」
3. 計算例（Calculation Example）
該当する場合は具体的な数値例を示す。金額は int（円単位の整数）で、端数処理ルール（CLAUDE.md 記載）に従う。
4. 注意点（Caveats）
- 落とし穴や例外事項を指摘する
references/common-pitfalls.mdの該当項目を参照
5. 免責事項（Disclaimer）
回答の末尾に以下を付記する:
この情報は一般的な税法の解釈に基づくものであり、個別の状況により異なる場合があります。具体的な判断は税理士等の専門家にご相談ください。
他スキルとのクロスリファレンス
| 関連スキル | 用途 | 参照タイミング |
|---|---|---|
consumption-tax | 消費税の計算・申告書作成 | 消費税額の具体的な計算が必要な場合 |
journal | 仕訳入力・帳簿管理 | インボイスに基づく仕訳の記帳方法 |
reading-invoice | 請求書画像のOCR読取 | 紙のインボイスをデータ化する場合 |
tax-advisor | 税務全般のアドバイス | インボイス以外の税務相談を含む場合 |
settlement | 決算処理 | 消費税の経理処理を確認する場合 |
免責事項
- 本スキルの情報は令和8年度税制改正大綱（令和7年12月26日閣議決定）までの内容を反映している
- 国会での法案審議・成立により内容が変更される可能性がある（特に3割特例、5段階スケジュール）
- 個別具体的な税務判断は、税理士等の専門家への相談を推奨する
- インボイス制度の経過措置は年度ごとに適用条件が変わるため、適用年度を必ず確認すること
© 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 7 other files (references) in skills/invoice-system of kazukinagata/shinkoku.
- SKILL.md
- references/btoc-and-pricing-strategy.md
- references/common-pitfalls.md
- references/decision-flowchart.md
- references/faq.md
- references/qualified-invoice-requirements.md
- references/registration-procedures.md
- references/transitional-measures-timeline.md
Open the folder on GitHubat commit 607574d
Compare with similar skills
Invoice System 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Invoice System this skillkazukinagata/shinkoku | 365 | — | ~778 | Automated safety check: Pass | MIT | |
| Ar AgingWellApp-ai/Well | 345 | — | ~532 | Automated safety check: Pass | MIT | |
| Clients Accountssickn33/agentic-awesome-skills | 47k | 1 repos | ~4.7k | Automated safety check: Pass | MIT | |
| Payments Receivedsickn33/agentic-awesome-skills | 47k | 1 repos | ~3.5k | Automated safety check: Pass | MIT | |
| Fee BillingJoelLewis/finance_skills | 206 | — | ~6.8k | Automated safety check: Pass | MIT | |
| Kiwi ReceiptsLeoYeAI/openclaw-master-skills | 2.2k | — | ~5.2k | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Invoice System
What does Invoice System do?
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)…. Invoice System is an agent skill from kazukinagata/shinkoku. 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-exempt businesses (免税事業者), transitional measures (経過措置), small-amount exceptions (少額特例), corrected invoices (修正インボイス), or any related topics.
When should I use Invoice System?
Invoice System fits situations like: 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).
How do I install Invoice System in Claude Code?
Run `npx skills add kazukinagata/shinkoku --skill invoice-system -a claude-code`. Or copy the skill folder (skills/invoice-system in kazukinagata/shinkoku) into .claude/skills/invoice-system in your project. Claude Code loads it when a task matches its description.
How do I install Invoice System in Codex?
Run `npx skills add kazukinagata/shinkoku --skill invoice-system -a codex`. Or copy the skill folder (skills/invoice-system in kazukinagata/shinkoku) into .agents/skills/invoice-system in your project. Codex loads it when a task matches its description.
Can I use Invoice System 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 invoice-system -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/invoice-system, .gemini/skills/invoice-system, .github/skills/invoice-system and .opencode/skills/invoice-system in your project.
What does Invoice System need to run?
SKILL.md names no scripts, command-line tools or credentials: Invoice System is instructions for the agent only.
Does Invoice System 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 Invoice System 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 Invoice System use?
Invoice System 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 Invoice System use?
About 778 tokens (SKILL.md is roughly 3.1k 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 15k tokens, read only when the agent opens those files.
What are the alternatives to Invoice System?
Skills that share tags, products or a category with Invoice System: Ar Aging (WellApp-ai/Well, 345 stars), Clients Accounts (sickn33/agentic-awesome-skills, 47k stars), Payments Received (sickn33/agentic-awesome-skills, 47k stars) and Fee Billing (JoelLewis/finance_skills, 206 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Invoice System?
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.