search-egov-laws

When to use

Use this skill when:

• The user asks about a specific Japanese law, cabinet order, or ministerial ordinance (e.g., "中小企業基本法", "個人情報保護法", "労働基準法").
• You need to find the official law_id / law_num for citation in legal research or due diligence briefs.
• The user wants a list of laws matching a keyword (e.g., "data privacy laws in Japan", "中小企業 関連法令").
• Pre-M&A diligence requires regulatory landscape mapping (which laws apply to a target's industry).
• Legal research workflows that require 公式 e-Gov citation rather than secondary sources.

How to invoke

Call the kokai MCP server's search_egov_laws tool:

{
  "name": "search_egov_laws",
  "arguments": {
    "keyword": "<search term, e.g., 中小企業, 個人情報, 労働基準>",
    "law_type": "<optional: Constitution / Act / CabinetOrder / MinisterialOrdinance / Rule>",
    "limit": 20
  }
}

keyword is required (free-text Japanese, matches law title + content). law_type is optional filter. limit defaults to 20, max 100.

law_type values (公式 enum)

Value	Japanese	Notes
Constitution	憲法	日本国憲法のみ
Act	法律	国会制定 (e.g., 中小企業基本法)
CabinetOrder	政令	内閣制定 (e.g., 中小企業基本法施行令)
MinisterialOrdinance	省令 / 府令	各省庁制定 (e.g., 個人情報保護法施行規則)
Rule	規則	委員会規則 等

Output structure

For each law:

• law_id (法令 ID、get_egov_laws_data で本文 / 条文 fetch に使う)
• law_num (法令番号、e.g., "昭和三十八年法律第百五十四号")
• title (法令名)
• title_kana (法令名 ふりがな)
• enforcement_date (施行日)
• promulgation_date (公布日)
• law_type (Constitution / Act / CabinetOrder / MinisterialOrdinance / Rule)
• source_authority: "official" (公式 cite_required layer)
• attribution_text: "出典: e-Gov 法令検索 (デジタル庁) https://laws.e-gov.go.jp/"

Differentiation from other Kokai sources

領域	gBizINFO	国税庁	J-Grants	EDINET	e-Gov 法令 (this)	官公需
法人特定	✅	✅	—	✅ (上場)	—	—
補助金	❌	—	✅	—	—	—
異動履歴	△	✅	—	△	—	—
IR / 財務	△	—	—	✅	—	—
法令本文 / 改正履歴	❌	❌	—	❌	✅ 公式	—
政府調達公告	—	—	—	—	—	✅

Pair with get-egov-laws-data to fetch the full text / 条文 of a specific law after discovery.

Use cases

• DD legal verification: After due-diligence-jp identifies a target in a regulated industry, search e-Gov for applicable laws (e.g., 金融商品取引法 / 個人情報保護法 / 労働基準法) and cite specific law_id in the brief.
• Subsidy compliance check: Combine with subsidy-fit-jp — find the parent law of a J-Grants subsidy (e.g., 中小企業基本法 for 中小企業向け subsidies) to provide regulatory context.
• M&A legal landscape: Identify all 業法 (industry-specific laws) applicable to a target.

Boundary

• Output is signal / 確認材料 / context — NOT legal advice.
• 法的判断 / 解釈 / 適用判定 requires a certified Japanese 弁護士 / 行政書士 / 司法書士.
• Cite attribution_text + law_id + enforcement_date in any final output.
• e-Gov 法令検索 is the official statute database operated by デジタル庁 — use it as the source of truth for current Japanese statutory text.
• Never fictionalize law content. If e-Gov returns no match, say so.