# Japan Corporate Number (npm · @pipeworx/mcp-japan-corporate-number)

japan-corporate-number — Japan's National Tax Agency (国税庁) corporate number register (法人番号公表サイト).…

- Trust score: 82/100 (high trust)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `gateway.pipeworx.io`: 77/100, [markdown](https://verifymcp.io/servers/pipeworx-io-japan-corporate-number/japan-corporate-number-mcp.md), [page](https://verifymcp.io/servers/pipeworx-io-japan-corporate-number/japan-corporate-number-mcp)
- npm · `@pipeworx/mcp-japan-corporate-number`: 82/100 (this document), [markdown](https://verifymcp.io/servers/pipeworx-io-japan-corporate-number/pipeworx-mcp-japan-corporate-number.md), [page](https://verifymcp.io/servers/pipeworx-io-japan-corporate-number/pipeworx-mcp-japan-corporate-number)

## Channel facts

- Registry: `npm`
- Package: `@pipeworx/mcp-japan-corporate-number`
- Version: `0.2.1`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, 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 2026-11-05.

- **Supply Chain Security**: 100/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - No production dependencies, so there is no dependency health to assess.
- **Provenance & Transparency**: 97/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to pipeworx-io/mcp-japan-corporate-number).
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 2 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 66/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 465 tokens (~232/item across 2 items; 2 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 20/100
  - Stability observed for 6 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.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 2 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 3 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Japan Corporate Number MCP server?

Japan Corporate Number runs locally as an npm package, launched with npx -y @pipeworx/mcp-japan-corporate-number. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add pipeworx-io-japan-corporate-number -- npx -y @pipeworx/mcp-japan-corporate-number
```

### Cursor

```json
{
  "mcpServers": {
    "pipeworx-io-japan-corporate-number": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-japan-corporate-number"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "pipeworx-io-japan-corporate-number": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-japan-corporate-number"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add pipeworx-io-japan-corporate-number -- npx -y @pipeworx/mcp-japan-corporate-number
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "pipeworx-io-japan-corporate-number": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@pipeworx/mcp-japan-corporate-number"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add pipeworx-io-japan-corporate-number --command npx --arg -y --arg @pipeworx/mcp-japan-corporate-number
```

### Hermes

```yaml
mcp_servers:
  pipeworx-io-japan-corporate-number:
    command: "npx"
    args: ["-y", "@pipeworx/mcp-japan-corporate-number"]
```

### Netclaw

```json
{
  "McpServers": {
    "pipeworx-io-japan-corporate-number": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "@pipeworx/mcp-japan-corporate-number"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add pipeworx-io-japan-corporate-number -t stdio -c npx -a -y @pipeworx/mcp-japan-corporate-number
```

### Other

```json
{
  "mcpServers": {
    "pipeworx-io-japan-corporate-number": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-japan-corporate-number"
      ]
    }
  }
}
```

## 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.

### 2026-11-04 (score 82, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-03 (score 81, +15)

- [security improvement] Malware scan: unverified → pass

### 2026-11-02 (score 66, −13)

- [security regression] Malware scan: pass → unverified
- [functional improvement] Stability: unverified → 0.10
- [functional] Package version: 0.2.0 → 0.2.1

### 2026-10-31 (score 79, 0)

- [functional regression] Security disclosure: unverified → fail

### 2026-10-30 (score 79)

First indexed and scored.

## MCP tools (2)

### `jp_corporate_number` (~156 tokens)

Look up one Japanese corporation/organization by its 13-digit 法人番号 (corporate number) in Japan's National Tax Agency register: legal name, katakana reading and English name when NTA holds one, address, corporate-kind (stock company, LLC, government body, etc.) and status (active, or closed/merged with the date and successor number). Validates the check digit before looking up. Use for "what company is corporate number 1234567890123", verifying a Japanese business is real, or resolving a 法人番号 found elsewhere.

Input parameters:

- `number` (string, required): The 13-digit 法人番号 (corporate number), digits only, e.g. "1000012160153".

### `jp_company_search` (~250 tokens)

Search Japan's National Tax Agency corporate-number register by name — Japanese (kanji/katakana, substring match; 株式会社/(株)/㈱/有限会社/合同会社 accepted as prefix or suffix), the official English name/katakana reading NTA holds for some entities, or the English name GLEIF holds for entities with an LEI ("Sony Group", "Toyota Motor Corporation"). Optionally filter by prefecture (Japanese name, English name, or 2-digit code). Returns each match's corporate number, name, kind and address so you can pick the right one, then call jp_corporate_number for full detail. Covers 5.8M registered entities: companies, government bodies, NPOs, foundations.

Input parameters:

- `limit` (number): Maximum results (1-50, default 10).
- `name` (string, required): Company/organization name or part of it, in Japanese or (when NTA published one) English — e.g. "トヨタ", "Toyota", "株式会社".
- `prefecture` (string): Optional prefecture filter: Japanese name ("北海道"), English name ("Hokkaido"), or 2-digit code ("01").

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/pipeworx-io-japan-corporate-number/pipeworx-mcp-japan-corporate-number#diagnostics

## Score history

- 2026-11-05: 82
- 2026-11-04: 82
- 2026-11-03: 81
- 2026-11-02: 66
- 2026-11-01: 79
- 2026-10-31: 79
- 2026-10-30: 79

## Common questions

### What is the Japan Corporate Number MCP server?

Japan Corporate Number is an MCP server listed in the public MCP registry as io.github.pipeworx-io/japan-corporate-number. japan-corporate-number, Japan's National Tax Agency (国税庁) corporate number register (法人番号公表サイト).… This page covers its npm package (@pipeworx/mcp-japan-corporate-number).

### Is the Japan Corporate Number MCP server safe to use?

Japan Corporate Number scores 82 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 5 November 2026. It declares no install or post-install scripts. Its build provenance is signed and verified. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Japan Corporate Number MCP server expose?

Japan Corporate Number exposes 2 tools: jp_corporate_number, jp_company_search. Their descriptions and schemas cost roughly 406 tokens of context every time the server is loaded.

### Is the Japan Corporate Number MCP server still maintained?

Japan Corporate Number is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the Japan Corporate Number MCP server under?

Japan Corporate Number declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- npm package: https://www.npmjs.com/package/@pipeworx/mcp-japan-corporate-number
- Socket report: https://socket.dev/npm/package/@pipeworx/mcp-japan-corporate-number
- Repository: https://github.com/pipeworx-io/mcp-japan-corporate-number
- Website: https://pipeworx.io/packs/japan-corporate-number
- Changelog RSS feed: https://verifymcp.io/servers/pipeworx-io-japan-corporate-number/pipeworx-mcp-japan-corporate-number.xml
- Changelog JSON feed: https://verifymcp.io/servers/pipeworx-io-japan-corporate-number/pipeworx-mcp-japan-corporate-number.json
- HTML version of this page: https://verifymcp.io/servers/pipeworx-io-japan-corporate-number/pipeworx-mcp-japan-corporate-number