nta-corporate-number-lookup

name	nta-corporate-number-lookup
description	Get authoritative Japanese corporate-number record from the National Tax Agency (国税庁) with change history (社名変更 / 移転 / 合併 / 解散). Use for M&A DD, KYC verification, dissolved-company detection, gBizINFO fallback.

When to use

Use this skill when:

• The user provides a 13-digit Japanese 法人番号 (corporate number).
• You need authoritative status of the corporation: active / dissolved / merged / closed.
• You need change history: name changes, address moves, merger events.
• gBizINFO returned no record (small / new / non-METI-tracked entity) and you want NTA fallback.
• M&A due diligence, KYC verification, or pre-meeting research where past 沿革 matters.

How to invoke

Call the kokai MCP server's get_nta_corporate_record tool:

{
  "name": "get_nta_corporate_record",
  "arguments": {
    "corporate_number": "<13-digit 法人番号>",
    "include_history": true
  }
}

Output structure

The response includes:

• latest: the current authoritative record (name, address, kind, process status, assignment date)
• history: previous records (name changes / address moves / etc., sorted by date desc)
• is_dissolved / is_merged: boolean flags for closure status
• process_summary: human-readable summary like "3 件の異動履歴あり (商号変更 / 国内所在地の変更 ...)"
• process_label: 公式 process classification (01=新規 / 11=商号変更 / 12=移転 / 71=合併解散 / 81=抹消 / 99=削除)
• source_authority: "official" (公式 cite_required layer)
• terms_of_use: cite gBizINFO terms

Differentiation from gBizINFO

領域	gBizINFO (get_entity_profile)	NTA (this skill)
法人番号 master	派生 source	authoritative
異動履歴 (社名変更 / 移転)	大半未提示	公式 + 完全
解散 / 合併消滅 detection	△ 限定的	公式 + 明確
gBizINFO 未登録法人	❌ 取得不可	✅ カバー
財務 / 株主 / 認定	✅ 充実	❌ なし

Pair this skill with gbizinfo-entity-lookup for full coverage.

Boundary

• Output is signal / 確認材料 / context — NOT a decision.
• Final 申請可否 / 法的判断 requires a certified Japanese 士業 (行政書士 / 中小企業診断士 / 公認会計士 / 弁護士).
• Cite source_url + retrieved_at + 国税庁 attribution in final output.
• Never fictionalize. If NTA returns "no record" for a valid 法人番号, the corporation may have been recently dissolved.