#!/usr/bin/env node
import { Server } from '@modelcontextprotocol/sdk/server/index.js';
import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js';
import {
CallToolRequestSchema,
ListToolsRequestSchema,
} from '@modelcontextprotocol/sdk/types.js';
import fetch from 'node-fetch';
// e-Gov法令API基底URL
const EGOV_API_BASE = 'https://laws.e-gov.go.jp/api/1';
class HoureiMCPServer {
constructor() {
this.server = new Server(
{
name: 'hourei-mcp-server',
version: '1.0.0',
},
{
capabilities: {
tools: {},
},
}
);
this.setupHandlers();
this.setupErrorHandling();
}
setupErrorHandling() {
this.server.onerror = (error) => {
console.error('[MCP Error]', error);
};
process.on('SIGINT', async () => {
await this.server.close();
process.exit(0);
});
}
setupHandlers() {
// ツール一覧の提供
this.server.setRequestHandler(ListToolsRequestSchema, async () => ({
tools: [
{
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'],
},
},
{
name: 'get_law_data',
description: '法令番号を指定して法令の詳細データを取得します。',
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'],
},
},
{
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'],
},
},
],
}));
// ツール実行
this.server.setRequestHandler(CallToolRequestSchema, async (request) => {
try {
const { name, arguments: args } = request.params;
switch (name) {
case 'search_law':
return await this.searchLaw(args);
case 'get_law_data':
return await this.getLawData(args);
case 'get_law_revision':
return await this.getLawRevision(args);
default:
throw new Error(`Unknown tool: ${name}`);
}
} catch (error) {
return {
content: [
{
type: 'text',
text: `エラーが発生しました: ${error.message}`,
},
],
isError: true,
};
}
});
}
async searchLaw(args) {
const { keyword, category, limit = 100 } = args;
// 検索APIのURL構築
const params = new URLSearchParams();
params.append('keyword', keyword);
if (category) {
params.append('category', category);
}
const url = `${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: ${error.message}`);
}
}
async getLawData(args) {
const { lawNum } = args;
const url = `${EGOV_API_BASE}/lawdata/${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: `法令データ（法令番号: ${lawNum}）:\n\n${data.substring(0, 10000)}${data.length > 10000 ? '\n...(省略)' : ''}`,
},
],
};
} catch (error) {
throw new Error(`法令データの取得に失敗しました: ${error.message}`);
}
}
async getLawRevision(args) {
const { lawNum } = args;
const url = `${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}`);
}
}
async run() {
const transport = new StdioServerTransport();
await this.server.connect(transport);
console.error('法令MCP Server running on stdio');
}
}
const server = new HoureiMCPServer();
server.run().catch(console.error);
