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Japan Law Search

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Full-text search of all current Japanese laws (official e-Gov data), down to exact article text.

Code source Documentation

Installation

Ajoutez ceci à la configuration MCP de votre client (Claude Desktop : claude_desktop_config.json ; Cursor : .cursor/mcp.json ; VS Code et les autres utilisent la même forme « mcpServers »).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http japan-law-search 'https://horei-mcp.plus-synergy.workers.dev/mcp'
Configuration JSON (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "japan-law-search": {
            "type": "http",
            "url": "https://horei-mcp.plus-synergy.workers.dev/mcp"
        }
    }
}
Remote (sse)
Claude Code 
claude mcp add --transport sse japan-law-search 'https://horei-mcp.plus-synergy.workers.dev/sse'
Configuration JSON (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "japan-law-search": {
            "type": "sse",
            "url": "https://horei-mcp.plus-synergy.workers.dev/sse"
        }
    }
}

Documentation

Tirée du README du projet sur GitHub, actualisée chaque semaine. Les liens ouvrent GitHub.

Sommaire
  1. Japan Law Search MCP — 日本の法令検索
  2. Why this server?
  3. Tools
  4. Example queries your agent can now answer
  5. Data source & freshness
  6. Pricing
  7. Get started

Japan Law Search MCP — 日本の法令検索

Give your AI agent authoritative access to all ~10,000 Japanese laws and regulations.

This MCP server searches and retrieves the full text of current Japanese legislation — acts, cabinet orders, and ministerial ordinances — from the official e-Gov Laws API (Government of Japan). Built for legal-tech, compliance, HR, and contract-review AI agents working with Japanese law.

Why this server?

Japanese statutes are published as deeply nested XML with kanji numerals, era-based dates, and no convenient full-text API surface for LLMs. This server turns that into three clean, token-efficient tools.

Tools

search_laws

Full-text search across the body text of every current law (or search by law title). Returns matched snippets, law categories, promulgation dates, and official links.

get_law_structure

Table of contents for any law: chapters, sections, and article headings. Long statutes (e.g. the Civil Code with 1,000+ articles) are automatically compressed to chapter level to save tokens.

get_law_article

Retrieve the exact text of any article. Accepts flexible references — 3, 第3条, 第三条の二, 3の2 — and normalizes kanji numerals automatically. Output preserves paragraph and item numbering as clean plain text.

Example queries your agent can now answer

  • 「電子署名法で電子署名が有効とされる条件は？」→ finds Article 3 and quotes it verbatim
  • "What does the Labor Standards Act say about overtime limits? Quote the exact article."
  • 「個人情報保護法の目次を見せて、第三者提供に関する条文を特定して」

Data source & freshness

Official e-Gov Laws API v2 (Government of Japan), fetched live on every call — always the currently enforced revision, including amendments enforced this month.

Pricing

Pay per tool call. One search, one table of contents, or one article retrieval = one event. No subscription, no minimum.

日本語

日本の現行法令（約1万件）を全文検索し、条文を取得できるMCPサーバーです。巨大な法令XMLをAIが読みやすいテキストに整形し、「第三条の二」等の表記ゆらぎも自動吸収します。リーガルテック・コンプライアンス・労務系AIに最適です。

Get started

This is a hosted (remote) MCP server, available on Apify Store:

👉 **https://apify.com/e-asakura/japan-law-search-mcp**

The store page includes setup instructions for Claude, ChatGPT, Cursor, and any MCP-compatible client. Pay-as-you-go: $0.02 per tool call, no subscription.

Built by Edward Asakura — Japanese data infrastructure for AI agents. Part of the SEKISHO series: subsidies / laws / parliament.

Questions fréquentes

Qu'est-ce que Japan Law Search ?

Full-text search of all current Japanese laws (official e-Gov data), down to exact article text.

Comment installer Japan Law Search ?

Il fonctionne comme serveur distant. Dans Claude Code : claude mcp add --transport http japan-law-search 'https://horei-mcp.plus-synergy.workers.dev/mcp'. Pour les autres clients, collez la configuration JSON de cette page dans leurs réglages MCP.

Faut-il une clé API pour Japan Law Search ?

Son entrée au registre n'indique aucune clé ni secret obligatoire. Certaines fonctions peuvent tout de même demander un compte auprès du service auquel il se connecte.

Japan Law Search est-il open source ?

Oui. Son code est sur GitHub sous licence MIT.

Qui maintient Japan Law Search ?

Il est publié par fujimura-ui. AI.tn le référence sans le maintenir ni le recommander.

Issu du registre MCP officiel. Être listé n'est pas une recommandation : vérifiez le code et les permissions d'un serveur avant de lui donner accès à vos données.