Japan Law Search MCP Server
io.github.easakura/japan-law-search-mcp
answering
Japan Law Search is answering right now. Last checked 8 min ago. 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
40 hours of history · worst hour 43%
40 hours agonow
50.0%
Uptime 24h
91 of 182 checks
3
Tools
read from the server
930 ms
Response time
average over 24h
0
Stars
last commit 10 Jul 2026
Connect this server
Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 8 min ago.
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"
}
}
}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 | 865 ms | 8 min ago |
| https://horei-mcp.easakura.workers.dev/sse | sse | answering | 200 ms | 9 min ago |
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 91 of 182 checks got a reply (50.0%), average response time 930 ms. The bar chart above shows every period we have measured.
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.
How fast is Japan Law Search?
It answers our handshake in 930 ms on average, which is faster than 6% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.
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.