# HojinCheck — Japanese corporate verification API (hojin = 法人/corporate entity) (remote · hojincheck.com)

Verify Japanese companies, invoice-issuer registrations and addresses against government open data.

- Trust score: 69/100 (medium)
- Change this week: +6
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- remote · `hojincheck.com`: 69/100 (this document), [markdown](https://verifymcp.io/servers/com-hojincheck-hojincheck/hojincheck.md), [page](https://verifymcp.io/servers/com-hojincheck-hojincheck/hojincheck)

## Channel facts

- Endpoint: `https://hojincheck.com/mcp`
- Transports: `streamable-http`
- Auth: `required`
- Version: `0.1.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-03.

- **Endpoint Security**: 71/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation is enforced on tool calls, but the challenge carries no valid RFC 9728 metadata, so a client cannot discover where to get a token.
  - HTTPS not yet verified: we couldn't determine whether a plaintext access path exists.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 60/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 1191 tokens (~198/item across 6 items; 6 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http com-hojincheck-hojincheck https://hojincheck.com/mcp
```

### Codex

```toml
[mcp_servers.com-hojincheck-hojincheck]
url = "https://hojincheck.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-hojincheck-hojincheck": {
      "type": "remote",
      "url": "https://hojincheck.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-hojincheck-hojincheck --url https://hojincheck.com/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-hojincheck-hojincheck:
    url: "https://hojincheck.com/mcp"
```

### Other

```json
{
  "mcpServers": {
    "com-hojincheck-hojincheck": {
      "type": "http",
      "url": "https://hojincheck.com/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-02 (score 69, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-31 (score 68, +3)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-29 (score 65, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-28 (score 64, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-27 (score 63, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-26 (score 63)

First indexed and scored.

## MCP tools (6)

### `resolve_company` (~193 tokens)

法人名から法人番号を解決

法人名（表記ゆれ・かな/カナ対応）から法人番号の候補と確度（0〜1＋根拠ラベル）を返します。データ源: 国税庁法人番号システムWeb-API。

Input parameters:

- `address` (string): 所在地で絞り込み: 都道府県コード2桁（JIS X 0401）または+市区町村コード3桁の計5桁
- `include_closed` (boolean): 閉鎖法人を候補に含める（既定true）
- `limit` (integer): 返却する候補数の上限（既定10）
- `name` (string, required): 法人名（(株)等の略記・全半角・かな/カナ・旧字体の表記ゆれ可）

### `verify_company` (~133 tokens)

法人番号の実在検証

法人番号（13桁・チェックディジット検証つき）から実在・商号・本店所在地・法人種別・閉鎖ステータスを返します。include_history=trueで商号変更等の履歴も返します。データ源: 国税庁法人番号システムWeb-API。

Input parameters:

- `corporate_number` (string, required): 法人番号13桁（全角・ハイフン・空白は吸収）
- `include_history` (boolean): 商号変更等の履歴を含める（既定false）

### `verify_invoice_number` (~230 tokens)

適格請求書発行事業者登録番号の検証

適格請求書発行事業者の登録番号（T+13桁）から登録有無・登録年月日・取消/失効を返します。on_dateで基準日時点の有効性判定、include_history=trueで公表履歴も返します。入力は登録番号のみ（氏名等による検索は提供しません）。データ源: 国税庁適格請求書発行事業者公表システムWeb-API。

Input parameters:

- `include_history` (boolean): 公表履歴（新規登録・変更・取消・失効）を含める（既定false）
- `on_date` (string): 基準日 YYYY-MM-DD（指定時はその日時点で登録が有効だったかを as_of で返す）
- `registration_number` (string, required): 適格請求書発行事業者登録番号（T+13桁。Tなし13桁・全角・ハイフン空白は吸収）

### `get_company_profile` (~129 tokens)

法人プロファイル取得（gBizINFO）

法人番号（13桁・チェックディジット検証つき）からgBizINFOの法人プロファイル（所在地・代表者・資本金・従業員数等）を、項目別の出典・最終取得日メタとあわせて返します。データ源: Gビズインフォ REST API v2（経済産業省）。

Input parameters:

- `corporate_number` (string, required): 法人番号13桁（全角・ハイフン・空白は吸収。チェックディジット検証あり）

### `normalize_address` (~279 tokens)

日本住所の正規化・要素分解・郵便番号照合

日本の住所を正規化し、都道府県／市区町村／町字（大字・町名＋丁目）に分解して町字ID（アドレス・ベース・レジストリ）を解決し、郵便番号と照合します（不一致は不一致として明示）。【v1の粒度と限界】分解は町字（大字・丁目）まで。街区符号・住居番号・地番・小字・京都の通り名は解析対象外で、未解析部分は残余文字列としてそのまま返します（推測補完なし）。データ源: アドレス・ベース・レジストリ町字マスター（デジタル庁）＋日本郵便郵便番号データ（ローカルマスター駆動・政府API停止の影響なし）。

Input parameters:

- `address` (string, required): 日本の住所文字列（郵便番号含み可。全半角・漢数字/算用数字・旧字体の表記ゆれ可）
- `postal_code` (string): 郵便番号を別引数で渡す場合に指定（住所文字列内の記載より優先して照合）

### `jp_calendar` (~227 tokens)

日本の祝日・営業日計算

日本の祝日判定と営業日計算（内閣府「国民の祝日」CSV準拠）。営業日=土日・祝日以外。year_end_as_holiday=trueで12/29〜1/3も非営業日扱い。

Input parameters:

- `date` (string): 基準日 YYYY-MM-DD（list_holidays以外で必須）
- `days` (integer): 加算する営業日数（add_business_daysで必須。負数=遡り、0=基準日をそのまま返す）
- `from` (string): 期間開始日（list_holidaysで必須）
- `op` (string, required): 操作種別
- `to` (string): 期間終了日（list_holidaysで必須）
- `year_end_as_holiday` (boolean): 12/29〜1/3を非営業日として扱う（官公庁・銀行休業の慣行。既定false=祝日法と土日のみ）

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-hojincheck-hojincheck/hojincheck#diagnostics

## Score history

- 2026-08-03: 69
- 2026-08-02: 69
- 2026-08-01: 68
- 2026-07-31: 68
- 2026-07-30: 65
- 2026-07-29: 65
- 2026-07-28: 64
- 2026-07-27: 63
- 2026-07-26: 63

## Links

- Remote endpoint: https://hojincheck.com/mcp
- Authorisation metadata: https://hojincheck.com/.well-known/oauth-protected-resource/mcp
- Website: https://hojincheck.com/
- Changelog RSS feed: https://verifymcp.io/servers/com-hojincheck-hojincheck/hojincheck/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-hojincheck-hojincheck/hojincheck/changelog.json
- HTML version of this page: https://verifymcp.io/servers/com-hojincheck-hojincheck/hojincheck