A
licenseB
qualityD
maintenanceEnables searching and retrieving Japanese legal information from the e-Gov Law API, including law searches by keyword, detailed law data retrieval, and revision history tracking.
3
4,033 npm
49
MIT
Japan Law Search MCP
by easakura
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.
Related MCP server: Houki e-Gov MCP Server
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.
Available Tools
3 toolsget_law_article法令の条文本文を取得A
law_idと条番号を指定して条文の本文を取得する。条番号は「3」「第3条」「第三条の二」「3の2」のいずれの形式でもよい。
Inputs: law_id (required), article (required).
get_law_structure法令の目次（章・条の一覧）を取得A
law_idを指定して法令の構造（章・節・条の見出し一覧）を取得する。どの条文を読むべきか当たりを付けるのに使う。law_idはsearch_lawsの結果に含まれる。
Inputs: law_id (required).
search_laws日本の法令を検索A
日本の現行法令（法律・政令・省令など約1万件）を政府公式データベース（e-Gov）から検索する。search_in=full_text（既定）は条文本文の全文検索、search_in=titleは法令名検索。結果のlaw_idをget_law_structure / get_law_articleに渡すと条文を参照できる。
Inputs: query (required), limit, search_in.
Tool Schema Changelog
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
Loading tool schema changelog…
TDQS
A4.1/5.0
Scored across 3 tools
Disambiguation5/5
Each tool has a clearly distinct purpose: search_laws for finding laws, get_law_structure for browsing structural headings, and get_law_article for retrieving specific article text. There is no functional overlap.
Naming Consistency5/5
All tool names follow a consistent verb_noun snake_case pattern (search_laws, get_law_structure, get_law_article), making them predictable and easy to remember.
Tool Count4/5
Three tools is minimal but sufficient for a focused law search server. The core workflow (search, browse structure, retrieve article) is covered, though additional tools like listing all laws or checking amendments could be justified.
Completeness4/5
The tool set covers the essential lifecycle: searching for laws, exploring their structure, and retrieving specific articles. While no major gaps exist, a tool to get law metadata or list recent updates would improve completeness.
Maintenance
ActivityInactive
ResponsivenessNo recent community issues
Related MCP Connectors
Search Japanese statutes via the e-Gov Law API. Free law_search tool.
Japan Law MCP — Japanese national laws & ordinances via the e-Gov Law API.
Semantic search across Japan's government white papers, in English or Japanese. Free beta.
Neutral Japanese politics data: laws, Diet bills, votes, parties, members, questions. All sourced.
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