Japan Law Search

io.github.fujimura-uiPublished by GitHub account fujimura-uiv1.0.0Updated Oct 24, 2026

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

VerifiedStreamable HTTPWeb executableWeb Search & ScrapingKnowledge & Memory

Overview

AI-generated overview

Remote MCP server that lets an assistant full-text search current Japanese laws and retrieve exact article text from official e-Gov data.

What you can do
  • Search laws by body text or title, with snippets, categories, promulgation dates and official links
  • Browse a law's table of contents (chapters, sections, article headings), compressed for long statutes
  • Fetch the exact text of a specific article, normalizing kanji numerals and flexible references
  • Answer questions about Japanese acts, cabinet orders and ministerial ordinances with verbatim quotes
When to use it
Useful for legal-tech, compliance, HR or contract-review work involving Japanese law, where the assistant must find the relevant statute and quote the exact article rather than paraphrase.
Requirements
A remote MCP endpoint; no local package, account, API key or environment variable is declared. The server calls the official e-Gov Laws API live on each request, so network access is needed.
Before you install
Usage is billed per tool call at $0.02, with no subscription or minimum, so repeated searches and article lookups cost money. Queries and law references are sent to the hosted server and on to the e-Gov API. Results reflect the currently enforced revision only.

Installation

In SourceWeft

  1. Open Japan Law Search in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.github.fujimura-ui%2Fjapan-law-search-mcp/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "japan-law-search": {
      "type": "http",
      "url": "https://horei-mcp.plus-synergy.workers.dev/mcp"
    }
  }
}

README

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.

Source: README.md at commit c3ac381

Tools

0
SourceWeft has not read this server's tools yet.

Version history

1
  1. v1.0.0LatestSep 16, 2026

Score

85% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts