Connect Corporate Number Publication Site (Houjin Bangou) to Copilot Studio
Query Corporate Number Publication Site (Houjin Bangou) directly from Copilot Studio. Arlet links the two through one MCP connection and takes care of API keys.
This server connects your AI client to the Corporate Number System Web API (Version 4) operated by Japan's National Tax Agency. Every registered corporation in Japan has a unique 13-digit corporate number, and this API is the authoritative source for the mapping between numbers, registered names, and head-office addresses.
Key features:
- Search corporations by name (prefix or partial match), optionally narrowed by prefecture/municipality.
- Resolve up to 10 corporate numbers at once to their registered name, address, corporation kind, and change/closure history.
Because the corporate number is the common key used by gBizINFO, EDINET, procurement data, and most other Japanese business datasets, this API is the natural first step for entity resolution: find the right corporate number first, then join everything else onto it.
Using the API requires a free application ID (γ’γγͺγ±γΌγ·γ§γ³ID) issued by the NTA; apply on the Web API page of the Corporate Number Publication Site. Set it as HOUJIN_BANGOU_APP_ID in your Arlet environment variables.
How to connect Corporate Number Publication Site (Houjin Bangou) to Copilot Studio
- 1
In the Arlet dashboard, open Data tools, find Corporate Number Publication Site (Houjin Bangou), set the API key issued by Corporate Number Publication Site (Houjin Bangou) and switch it on.
- 2
Sign in to Copilot Studio with your work account, create a new agent (or open an existing one), and in the Build tab choose Tools β + β Add β Model Context Protocol (MCP) in the right panel.
- 3
In the Add MCP server form, enter "Arlet" as the Server name, https://mcp.arlet.dev/mcp/ as the Server URL, choose OAuth 2.0 for Authentication and "Dynamic (detected)" for Configuration type, then click Add. No Client ID / Secret is needed.
- 4
On the Select a connection screen, choose Create new connection β Create, then sign in with Google on the Arlet authorization screen and click Allow. Click Add to attach the tool to the agent, then Publish to use it from Microsoft 365 Copilot.
Requires a Microsoft work account and a Copilot Studio license (or trial). MCP is available only for agents using generative orchestration and not in Copilot Studio in Teams.