feat: indicate which dsn connector is active

Author: tianzhou

package.json

@@ -1,6 +1,6 @@
 {
   "name": "dbhub",
-  "version": "0.0.8",
+  "version": "0.1.0",
   "description": "Universal Database MCP Server",
   "main": "dist/index.js",
   "type": "module",

src/tools/list-connectors.ts

@@ -1,25 +1,46 @@
 import { ConnectorManager } from '../connectors/manager.js';
 import { ConnectorRegistry } from '../connectors/interface.js';
 import { createToolSuccessResponse } from '../utils/response-formatter.js';
+import { isDemoMode } from '../config/env.js';
 
 /**
  * list_connectors tool handler
  * Lists all available database connectors and their sample DSNs
+ * Indicates which connector is active based on current DSN
  */
 export async function listConnectorsToolHandler(_args: {}, _extra: any) {
   const connectors = ConnectorManager.getAvailableConnectors();
   const samples = ConnectorRegistry.getAllSampleDSNs();
 
+  // Get active connector if possible
+  let activeConnectorId: string | null = null;
+  try {
+    // Check if we have an active connection using static method
+    const activeConnector = ConnectorManager.getCurrentConnector();
+    activeConnectorId = activeConnector.id;
+  } catch (error) {
+    // No active connector yet or not connected
+  }
+  
+  // If we're in demo mode, SQLite should be active
+  const isDemo = isDemoMode();
+  if (isDemo && !activeConnectorId) {
+    activeConnectorId = 'sqlite';
+  }
+  
   // Convert to a more structured format
   const sampleObjects = Object.entries(samples).map(([id, dsn]) => ({ 
     id, 
-    dsn 
+    dsn,
+    active: id === activeConnectorId
   }));
 
   // Prepare response data
   const responseData = {
     connectors: sampleObjects,
-    count: sampleObjects.length
+    count: sampleObjects.length,
+    activeConnector: activeConnectorId,
+    demoMode: isDemo
   };
 
   // Use the utility to create a standardized response