Subsidy Antenna MCP Server

An MCP server for searching Japanese government subsidies and grants from AI assistants. It handles an archive of closed calls and the recurring application periods derived from them.

An MCP server for searching Japanese government subsidies and grants, including an archive of closed calls and their recurring application periods.

Features

• Search by region, industry, purpose, and recruitment status

• List by closest deadline (with remaining days)

• Search for closed calls. Information that disappears from official sites is preserved.

• Query recurring application periods. Answers "When is this subsidy likely to open next?" based on past records.

The official MCP server published by the Digital Agency (digital-go-jp/jgrants-mcp-server) handles currently open calls. This server differs in that it holds an archive of closed cases. They can be used together depending on the purpose.

Setup

Node.js 18 or higher is required.

Claude Code

claude mcp add hojokin-antenna -- npx -y hojokin-antenna-mcp

Claude Desktop / Other Clients

Add the following to your configuration file.

{
  "mcpServers": {
    "hojokin-antenna": {
      "command": "npx",
      "args": ["-y", "hojokin-antenna-mcp"]
    }
  }
}

Tools

status can be open (default) / upcoming / closed / all. When pref is specified, it returns programs targeting that prefecture as well as nationwide programs.

Usage Examples

「東京都の製造業で使える補助金を締切が近い順に教えて」
「省エネ関連の補助金で、来月までに締め切るものはある?」
「ものづくり補助金は例年いつ公募が始まる?」
「4月に公募が始まる制度をまとめて」

About Recurring Application Periods

What list_recurring_schedule returns is an aggregation of past records and does not predict or guarantee future calls. Programs may be revised or abolished each fiscal year, and application periods may change or calls may not occur at all.

The inclusion criteria are as follows. Loosening them would cause already abolished programs or multiple deadlines within the same fiscal year to appear as "annual regulars."

• There must be at least three calls in different years.

• The most recent call must have started within the last two years.

• The start month of the first call in each year must match in at least half of the years with records.

About the Data

• Data source: Public data from Subsidy Antenna at /data/v1/

• Primary sources: J-Grants (Digital Agency) public API, J-Net21 (SME Support) support information headlines

• Update frequency: Once a day

• The environment variable HOJOKIN_ORIGIN can change the data source (default https://hojokin-antenna.pages.dev)

Fetched data is cached in memory for one hour. Since the data is updated daily, fetching more frequently is unnecessary.

Disclaimer

This is processed public information from government agencies. Accuracy and timeliness are not guaranteed. When applying, always check the latest application guidelines on the official website of each program. The author assumes no responsibility for any damages arising from the use of this server.

This server does not create or proofread subsidy application documents (under the Administrative Scrivener Act, paid document preparation is a licensed business).

Development

npm install
npm test        # 実際に MCP クライアントから4つのツールを呼んで確認する

To test with local data:

HOJOKIN_ORIGIN=http://localhost:8931 npm test

License

MIT