Hourei MCP Server

Instructions

Implementation Reference

• index.js:190-214 (handler)

  The main handler function for the 'get_law_revision' tool. It takes a lawNum argument, constructs the e-Gov API URL for law revisions, fetches the data, and returns it formatted as MCP content.

  async getLawRevision(args) {
    const { lawNum } = args;
    
    const url = `${EGOV_API_BASE}/lawrevisions/${encodeURIComponent(lawNum)}`;
    
    try {
      const response = await fetch(url);
      if (!response.ok) {
        throw new Error(`API request failed: ${response.status}`);
      }
      
      const data = await response.text();
      
      return {
        content: [
          {
            type: 'text',
            text: `改正履歴（法令番号: ${lawNum}）:\n\n${data}`,
          },
        ],
      };
    } catch (error) {
      throw new Error(`改正履歴の取得に失敗しました: ${error.message}`);
    }
  }

• index.js:88-97 (schema)

  Input schema for the 'get_law_revision' tool, defining the required 'lawNum' parameter as a string.

  inputSchema: {
    type: 'object',
    properties: {
      lawNum: {
        type: 'string',
        description: '法令番号（例: 平成十七年法律第百十七号）',
      },
    },
    required: ['lawNum'],
  },

• index.js:85-98 (registration)

  Tool registration in the ListToolsRequestHandler response, providing name, description, and schema for 'get_law_revision'.

  {
    name: 'get_law_revision',
    description: '法令の改正履歴を取得します。',
    inputSchema: {
      type: 'object',
      properties: {
        lawNum: {
          type: 'string',
          description: '法令番号（例: 平成十七年法律第百十七号）',
        },
      },
      required: ['lawNum'],
    },
  },

• index.js:112-113 (registration)

  Registration in the CallToolRequestHandler switch statement, routing calls to 'get_law_revision' to the getLawRevision method.

  case 'get_law_revision':
    return await this.getLawRevision(args);