MCP For Claude Marketplace
e-Gov Japan Laws

e-Gov Japan Laws MCP Connector for Claude

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Japan's official legislation portal as an MCP: browse all 18,000+ acts, cabinet orders and ordinances, fetch full structured text (chapters > articles > paragraphs), extract single articles or search keywords inside laws — keyless.

5 tools Official Updated Oct 1, 2026 Official Vinkius Partner
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e-Gov is the Japanese government's official legal portal — every law in force in Japan, as a single MCP server.

What you can do

  • Browse the catalog — the Constitution + all acts (9,000), cabinet orders (2,100), imperial orders (2,400) and ministerial ordinances (4,500), each with law ID, number and promulgation date
  • Fetch full structured text — complete law as a clean hierarchy: Law > Chapter > Article > Paragraph > Sentence
  • Get the outline first — chapters and article titles without the text, the fast way to understand a law's coverage
  • Extract one article — "what does Article 29 of the Constitution say", answered with the exact promulgated text
  • Search inside laws — find where a topic is regulated: 消費税 (consumption tax), 労働 (labour), 選挙 (elections) across every article of a law

Why it matters

Japanese law text is famously opaque to outsiders: kanji numbering, era-based dates (令和/Reiwa), mixed act/order hierarchy. This MCP gives you the authoritative source — the same text courts and companies cite — in structured form an AI can navigate.

Who is this for?

Legal-tech builders, compliance teams, researchers, translators, journalists and AI agents that need the actual text of Japanese law.

japanlawslegislationlegal-techcompliancegovernment-data

5 tools expose this connector's capabilities to your AI agent.

get_law

Use law_id from list_laws (e.g. 321CONSTITUTION = the Constitution). Large laws can be several hundred KB. Text is Japanese. Get the FULL structured text of a Japanese law (articles, chapters, provisions)

list_laws

Categories: 1=Constitution + Acts (all laws, ~9000), 2=Cabinet Orders (~2100), 3=Imperial Orders (~2400), 4=Ministerial Ordinances (~4500). Each entry: law_id (use in get_law), law_name, law_number, promulgation date. Japanese text. Use query_terms to filter client-side — the API has no server-side search. List Japanese laws by category (constitution, acts, imperial orders, ministerial ordinances) with law IDs

get_law_outline

The fast way to see what a law covers before fetching specific articles. Get the structural outline of a law WITHOUT the full text (chapters + article titles)

get_law_article

For "what does Article 29 of the Constitution say". Tip: article Num attribute follows the kanji numbering order — use get_law_outline first to map article numbers. Extract ONE article (or chapter) of a Japanese law with its full text

search_law_articles

Japanese keyword required (e.g. 消費税 for consumption tax, 労働 for labour, 選挙 for elections). Search every article of a law for a keyword (finds where a topic is regulated)

See how to talk to your AI agent using e-Gov Japan Laws.

What does Article 29 of the Japanese Constitution say?

⚖️ **Constitution (日本国憲法) — Article 29** Paragraph 1: The right to own or to hold property is inviolable. Paragraph 2: Property rights shall be defined by law, in conformity with the public welfare. Paragraph 3: Private property may be taken for public use upon just compensation therefor. Sources straight from e-Gov (321CONSTITUTION). Want the preceding property-rights articles or the English context?

Where is consumption tax regulated? Search the consumption tax act for 消費税

🔎 **Consumption Tax Act — keyword search 消費税** Found 47 matching articles. Key ones: - Article 4 (課税物件): taxable goods and transactions - Article 28: tax rate application per category - Article 57: export exemptions I can pull the full text of any of these articles or search another law.

Give me the outline of Japan's Labour Standards Act

📋 **Labour Standards Act (労働基準法) — outline** Chapter 1: General provisions (arts. 1-13) Chapter 2: Labour contracts (14-18) Chapter 3: Wages (24-26) · Chapter 4: Working hours (32-40) · Chapter 5: Safety and health… 13 chapters, ~120 articles. Want the full text of the working-hours chapter?

No. The e-Gov Laws API is fully public — list, full text, outline, article extraction and keyword search all work without authentication.

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