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get_meta_info

Retrieve metadata for statistical tables from Japan's e-Stat portal, including classifications, time periods, and structural information.

Instructions

統計表のメタ情報を取得する.

Args: stats_data_id: 統計表ID

Returns: メタ情報(分類事項、時間軸など)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
stats_data_idYes

Implementation Reference

  • The core handler function implementing the get_meta_info tool. It makes an API request to e-Stat's getMetaInfo endpoint using the provided stats_data_id and returns the metadata as a dictionary.
    async def get_meta_info(stats_data_id: str) -> dict:
        """統計表のメタ情報を取得する.
    
        Args:
            stats_data_id: 統計表ID
    
        Returns:
            メタ情報(分類事項、時間軸など)
        """
        params = {
            "lang": "J",
            "statsDataId": stats_data_id,
        }
    
        response = await _make_request("json/getMetaInfo", params)
        return cast(dict[str, Any], response)
  • Registration of the get_meta_info tool using the FastMCP decorator, making it available in the MCP server.
    mcp.tool()(get_meta_info)
  • Helper function used by get_meta_info to make HTTP requests to the e-Stat API, handling authentication, parameters, and response parsing.
    async def _make_request(
        endpoint: str,
        params: dict | None = None,
        *,
        method: str = "GET",
        format: str = "json",
        data: dict | None = None,
    ) -> dict[str, Any] | str:
        """e-Stat APIへのリクエストを実行する.
    
        Args:
            endpoint: APIエンドポイント(例: \"json/getStatsList\")
            params: クエリパラメータ
            method: HTTPメソッド(GET/POST)
            format: レスポンス形式(\"json\" または \"csv\")
            data: POST時のフォームデータ
    
        Returns:
            JSONの場合はdict、CSVの場合は文字列
    
        Raises:
            ValueError: APIキーが設定されていない場合
            httpx.HTTPError: API通信エラー
        """
        settings = get_settings()
        if not settings.E_STAT_APP_ID:
            raise ValueError(
                "E_STAT_APP_ID環境変数が設定されていません。"
                "https://www.e-stat.go.jp/api/ からアプリケーションIDを取得してください。"
            )
    
        url = f"{E_STAT_API_BASE}/{endpoint}"
        request_params = {"appId": settings.E_STAT_APP_ID, **(params or {})}
        http_method = method.upper()
    
        async with httpx.AsyncClient() as client:
            if http_method == "POST":
                response = await client.post(
                    url, params=request_params, data=data, timeout=DEFAULT_TIMEOUT
                )
            else:
                response = await client.get(
                    url, params=request_params, timeout=DEFAULT_TIMEOUT
                )
    
            response.raise_for_status()
            if format == "csv":
                return response.text
            return response.json()

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