legal-research

legal-research is a command for Claude Code from Kokai-Data/japan-business-data. It costs 30 tokens per session (281 once invoked), scanned A, original, Apache-2.0.

A command for searching Japan’s official database of laws, cabinet orders, and ministerial regulations, or retrieving the complete text and structure of a specific law.

In plain words
What is it for?
Use it to search Japanese legal terms or retrieve a statute by its law ID, including its chapters and articles.
Why use it?
It saves you from manually searching e-Gov 法令検索 and helps you find the official wording. It provides source text, not legal advice or interpretation.

Command for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the kokai-data plugin — 19 skills, 8 commands, 7 agents, 1 MCP server shipped together

Good fit Use it to search Japanese legal terms or retrieve a statute by its law ID, including its chapters and articles.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/kokai-data/japan-business-data/legal-research
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/Kokai-Data/japan-business-data

Made for: Claude Code.

Or install kokai-data, the plugin that ships this one along with the rest of its 19 skills, 8 commands, 7 agents, 1 MCP server.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for legal-research

README.md
[![agentmods](https://agentmods.dev/badge/commands/kokai-data/japan-business-data/legal-research/github.svg)](https://agentmods.dev/commands/kokai-data/japan-business-data/legal-research)
Your own site
<a href="https://agentmods.dev/commands/kokai-data/japan-business-data/legal-research"><img src="https://agentmods.dev/badge/commands/kokai-data/japan-business-data/legal-research/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for legal-research

Your own site · 80×15
<a href="https://agentmods.dev/commands/kokai-data/japan-business-data/legal-research"><img src="https://agentmods.dev/badge/commands/kokai-data/japan-business-data/legal-research.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 30 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 281 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00030 $0.00281
Opus 5 $0.00015 $0.00140
Sonnet 5 $0.00006 $0.00056
Haiku 4.5 $0.00003 $0.00028

Measured 12d ago against content hash eab9eb3b808b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

legal-research scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/vertical-plugins/kokai-data/commands/legal-research.md · 22 lines

What it actually says

Search Japanese laws / cabinet orders / ministerial ordinances via e-Gov 法令検索 (デジタル庁) — or fetch full statute text + chapter / article structure for a specific law_id.

Usage:

  • /legal-research <keyword> — search by keyword (e.g., /legal-research 中小企業, /legal-research 個人情報保護)
  • /legal-research <law_id> — fetch full statute (e.g., /legal-research 338AC0000000154)

Returns cited list of candidate laws OR verbatim 条文 + 4-layer authority strip + 弁護士 / 行政書士 / 司法書士 boundary disclaimer.

Calls search-egov-laws and / or get-egov-laws-data Skills (公式 e-Gov API v2, デジタル庁).

Boundary

Output is verbatim 公式 statute text — NOT legal advice / interpretation / 適用判定. 法令解釈 / 法的助言 / 訴訟戦略 requires certified Japanese 弁護士 / 行政書士 / 司法書士.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 12d ago First seen · 22 lines · 30 tokens per session scan A eab9eb3b808b

Subscribe to this mod's changes

legal-research is a command published in the GitHub repository Kokai-Data/japan-business-data (2 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 30 tokens to every session and 281 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.