Hourei MCP Server

Instructions

Implementation Reference

• index.js:131-162 (handler)

  The main handler function for the 'search_law' tool. It destructures arguments (keyword, category, limit), builds the e-Gov API search URL, fetches the data, truncates if too long, and returns a formatted text response.

  async searchLaw(args) {
    const { keyword, category, limit = 100 } = args;
    
    // 検索APIのURL構築
    const params = new URLSearchParams();
    params.append('keyword', keyword);
    if (category) {
      params.append('category', category);
    }
    
    const url = `${EGOV_API_BASE}/lawlists/1?${params.toString()}`;
    
    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: `法令検索結果（キーワード: "${keyword}"）:\n\n${data.substring(0, 5000)}${data.length > 5000 ? '\n...(省略)' : ''}`,
          },
        ],
      };
    } catch (error) {
      throw new Error(`法令検索に失敗しました: ${error.message}`);
    }
  }

• index.js:50-69 (schema)

  Input schema/JSON Schema for the 'search_law' tool defining properties: keyword (string, required), category (string enum), limit (number, default 100).

  inputSchema: {
    type: 'object',
    properties: {
      keyword: {
        type: 'string',
        description: '検索キーワード（法令名の一部や法令番号）',
      },
      category: {
        type: 'string',
        description: '法令の種別（1:法律、2:政令、3:省令など）',
        enum: ['1', '2', '3', '4', '5'],
      },
      limit: {
        type: 'number',
        description: '取得する最大件数（デフォルト: 100）',
        default: 100,
      },
    },
    required: ['keyword'],
  },

• index.js:47-70 (registration)

  Tool registration in the ListToolsRequestSchema response: defines name 'search_law', description, and inputSchema.

  {
    name: 'search_law',
    description: '法令名や法令番号で法令を検索します。キーワード検索に対応しています。',
    inputSchema: {
      type: 'object',
      properties: {
        keyword: {
          type: 'string',
          description: '検索キーワード（法令名の一部や法令番号）',
        },
        category: {
          type: 'string',
          description: '法令の種別（1:法律、2:政令、3:省令など）',
          enum: ['1', '2', '3', '4', '5'],
        },
        limit: {
          type: 'number',
          description: '取得する最大件数（デフォルト: 100）',
          default: 100,
        },
      },
      required: ['keyword'],
    },
  },

• index.js:108-109 (registration)

  Dispatch/registration in the CallToolRequestSchema switch statement: routes 'search_law' calls to the searchLaw handler.

  case 'search_law':
    return await this.searchLaw(args);