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Japan Public Data (法人番号・登録支援機関・官公需入札)

by takaratomita · remote · no sign-in to list tools · v0.1.0 · published by GitHub user takaratomita

Japan public data: corporate numbers, registered support organizations, government bid notices.

Read only
CompareRegistry entry

3 tools: 3 only read.

Scanned Oct 22, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http tools https://mcp-tools.takara0408103123.workers.dev/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

3 tools

Only reads 3Claude Code: allow
  • lookup_corporate_numberLook up Japanese companies in the National Tax Agency Corporate Number Publication Site.Reads text others writeNo findings

    Why it is in this group

    • The name "lookup_corporate_number" says "lookup": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Look up Japanese companies in the National Tax Agency Corporate Number Publication Site. Search by 13-digit corporate number, or by company name. Returns name, address and status. 国税庁 法人番号公表サイトから、法人番号（13桁）または法人名で法人情報（名称・所在地・閉鎖有無）を検索します。

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • search_local_govt_bidsSearch bid and tender notices from Japanese local governments and national agencies via the KKJ (官公需情報ポータルサイト) search API by the Small and Medium Enterprise Agency.Reads text others writeNo findings

    Why it is in this group

    • The name "search_local_govt_bids" says "search": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Search bid and tender notices from Japanese local governments and national agencies via the KKJ (官公需情報ポータルサイト) search API by the Small and Medium Enterprise Agency. Filter by keywords (AND), prefecture, issuing organization and notice date. Returns title, organization, dates and the notice URL. 官公需情報ポータルサイトの検索APIで、自治体・国の機関の入札・公募情報をキーワード・都道府県・機関名・公告日で検索します。

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • search_support_orgsSearch the Immigration Services Agency of Japan registry of Registered Support Organizations for Specified Skilled Workers.No findings

    Why it is in this group

    • The name "search_support_orgs" says "search": a word for reading.
    Description, as the server wrote it
    Search the Immigration Services Agency of Japan registry of Registered Support Organizations for Specified Skilled Workers. Filter by name, location (prefecture/city in head office or support office address) and supported language. Organizations that reported suspension are excluded unless includeSuspended is true. 出入国在留管理庁「登録支援機関登録簿」から、特定技能外国人の登録支援機関を名称・所在地・対応言語で検索します（同梱データ・基準日あり）。

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data or outbound.

Reads private data0
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write2
Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out0
Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Remote posture

What anyone on the internet sees at the remote endpoint: an anonymous initialize and tools/list, and the public OAuth metadata.

Looked at Oct 22, 2026, 15:06 UTC, unchanged since Oct 22, 2026. No credentials were sent and no tool was called. What is looked at.

Reachable
yes
HTTP status of an anonymous initialize
200
tools/list served without credentials
yes
Tools that change things, listed without credentials
0
Protocol version
2025-06-18
WWW-Authenticate on 401
not observed
resource_metadata in WWW-Authenticate
none
RFC 9728 protected resource metadata
none
Authorization servers
none
Legacy HTTP+SSE transport
no
Dynamic client registration
not observed
Client ID metadata documents
not observed

Install

Pinned to version 0.1.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http tools https://mcp-tools.takara0408103123.workers.dev/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__tools__lookup_corporate_number",
      "mcp__tools__search_support_orgs",
      "mcp__tools__search_local_govt_bids"
    ],
    "ask": [],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as tools. Review it before you use it.

Capability tags behind 2 rules
  • mcp__tools__lookup_corporate_number untrusted-input
  • mcp__tools__search_local_govt_bids untrusted-input