Japan Law Search MCP Server

by easakura Your server? Claim it

not responding

Japan Law Search is listed as active in the registry but did not answer our last check. It exposes 3 tools. Last commit 10 Jul 2026.

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

Uptime history 51 days of history · worst day 0%

51 days agonow

0.0%

Uptime 24h

0 of 182 checks

Tools

read from the server

57 ms

Response time

average over 24h

Stars

last commit 10 Jul 2026

Japan Law Search does not always answer

Over the last week it answered 0.0% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 7 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add japan-law-search-mcp --transport http https://horei-mcp.easakura.workers.dev/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "japan-law-search-mcp": {
      "url": "https://horei-mcp.easakura.workers.dev/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.japan-law-search-mcp]
url = "https://horei-mcp.easakura.workers.dev/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "japan-law-search-mcp": {
      "url": "https://horei-mcp.easakura.workers.dev/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "japan-law-search-mcp": {
      "url": "https://horei-mcp.easakura.workers.dev/mcp"
    }
  }
}

This server publishes 1 more address. The block above uses the one we reach during checks; the full list is under Endpoints below, and the author may intend a particular one for your client.

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

law

get_law_article

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。

get_law_structure

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。

laws

search_laws

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。

Endpoints

URL	Transport	State	Latency	Checked
https://horei-mcp.easakura.workers.dev/mcp	streamable-http	answering	57 ms	7 min ago
https://horei-mcp.easakura.workers.dev/sse	sse	answering	102 ms	7 min ago

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Japan Law Search — questions

Answers built from our own checks of this server.

What can Japan Law Search do?

It exposes 3 tools, read directly from the server on our last check. Among them: get_law_article, get_law_structure, search_laws. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Japan Law Search working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 0 of 182 checks got a reply (0.0%), average response time 57 ms. The bar chart above shows every period we have measured.

The registry lists Japan Law Search as active — why does it not respond?

The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.

How do I connect Japan Law Search?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Japan Law Search need an API key?

No. Japan Law Search completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.

Is Japan Law Search open source?

Yes — it is published under the MIT licence, written in TypeScript and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.