Skip to content
japanlaw logo

japanlaw MCP server

Which MCP servers are japanlaw's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-31

← Back to japanlaw

Whose server it is
  • Registry nameorg.japanlaw/japanese-lawverified in the MCP registry

The registry name sits under japanlaw.org. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-31
  • Stateanswerschecked 2026-10-31
  • Tools8
  • Server calls itselfjapanlaw
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-10-31 the server answered initialize and tools/list without a sign-in. First answer in 55 ms.

Should an agent connect itNot proven either way yet
  • Its tools do every use case we checked: check which Japanese labour rule applies to a workplace question; find the English text of a specific law article.
  • Checked on 5 of the 7 days it takes to judge reliability.

Once connected

  • For "check which Japanese labour rule applies to a workplace question", the likely first call is search.
  • For "find the English text of a specific law article", the likely first call is get_provision.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 5, the first on 2026-10-31
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 5 so far
  • What an agent can do with it2 of 2 use cases
  • Answeredmeasuring5 of the 7 daily checks it takes to print a share
  • Median first answer88 ms
  • Space in an agent's context≈ 4,803 tokensthe definitions of all its tools (9), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results9 of 9 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

What an agent can do with it

  • can do · check which Japanese labour rule applies to a workplace question
  • can do · find the English text of a specific law article
  • not sure · send a client a link to a cited paragraph and item

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers8 tools · read 2026-10-31
  • search

    Search the Japanese statutes japanlaw.org holds, in force today. A query with any Japanese in it searches the Japanese text (時間外労働, 有給休暇); one without searches the English shown for each provision, stemmed (overtime, paid leave). Results…

  • fetch

    Read what an id from search names. A provision's id (labor-standards-act/art-36) returns it as Markdown: the Japanese text with each paragraph's English under it, every English line marked as the Ministry of Justice's translation, the…

  • list_laws

    Every law japanlaw.org holds: Japanese and English title, short names, kind (法律 Act, 政令 Cabinet Order, 省令 Ministerial Order…), law number, the date the text held took effect, number of articles, the share of paragraphs with English, and…

  • get_law

    One law: titles, number, kind, when the text in force took effect, the texts held (versions: in force, not yet in force, no longer in force, each with the days it stands), how much of it has the Ministry's English, and this site's plain…

  • get_provision

    One article, paragraph or item of a law, with everything under it. Call it with law and address: {"law": "labor-standards-act", "address": "art-36"}, or {"law": "労働基準法", "address": "第三十二条の三第一項"}. For each paragraph and item, the Japanese…

  • get_citing_provisions

    Every provision in the laws japanlaw.org holds that cites the given one — the other direction from what a statute says, which no official source publishes. Each with its law, designation, the words it cites with, an id for fetch and its…

  • get_definitions

    The words a law defines for itself (定義語): inside that law, and only as far as each definition reaches, the word means what the statute says, not what it means in everyday speech or in another law. For each, the statute's own words…

  • get_amendments

    A law's amendments whose changes japanlaw.org holds: the amending Act (titles, law number), the day it takes effect, whether it is in force, not yet in force or since replaced (state), how many provisions it changes, adds and removes, and…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "japanese-law": {
      "type": "http",
      "url": "https://japanlaw.org/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http japanlaw https://japanlaw.org/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://japanlaw.org/mcp as a custom connector in the settings.

OpenAPI spec

3 paths, read 2026-10-31. Open the spec ↗

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.