First running version

reference_impl/mcplets/internal/erp/index.ts

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+/**
+ * ERP MCPlet (内部システム)
+ * pool: なし (pool-less) | mcpletType: read | visibility: [model]
+ */
+import { MCPletServer } from '../../mcplet-server.js';
+
+const MOCK_SERVICE_URL = process.env.MOCK_SERVICE_URL ?? 'http://localhost:5100';
+
+const server = new MCPletServer('erp-mcplet');
+
+server.registerTool({
+  name: 'query_erp',
+  description: 'ERPシステムから在庫・発注情報を取得します。商品在庫確認や調達状況の把握に使用します。',
+  inputSchema: {
+    type: 'object',
+    properties: {
+      entity: {
+        type: 'string',
+        enum: ['inventory', 'orders'],
+        description: '取得するエンティティ種別',
+      },
+      item: {
+        type: 'string',
+        description: '商品カテゴリ (例: dessert, drink)',
+      },
+    },
+    required: ['entity'],
+  },
+  mcpletType: 'read',
+  visibility: ['model'],
+  handler: async (args) => {
+    const entity = args['entity'] as string;
+    const item = args['item'] as string | undefined;
+
+    if (entity === 'inventory') {
+      const qs = item ? `?item=${encodeURIComponent(item)}` : '';
+      const res = await fetch(`${MOCK_SERVICE_URL}/erp/inventory${qs}`);
+      if (!res.ok) throw new Error(`ERP API returned ${res.status}`);
+      return res.json();
+    }
+
+    return { entity, message: 'Mock ERP orders data' };
+  },
+});
+
+await server.listen();