fix: update MCP Apps to use new _meta.ui.resourceUri format

- Update @modelcontextprotocol/ext-apps to 0.4.0
- Use new nested format `_meta.ui.resourceUri` in tool definition
- Remove resourceUri from tool result (only needed in tool definition)
- Add example structuredContent and _meta in tool result for demo

Author: antonpk1

package.json

@@ -23,7 +23,7 @@
     "clean": "rm -rf dist"
   },
   "dependencies": {
-    "@modelcontextprotocol/ext-apps": "https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/ext-apps@95663d4",
+    "@modelcontextprotocol/ext-apps": "^0.4.0",
     "@modelcontextprotocol/sdk": "^1.24.2",
     "@redis/client": "^1.6.0",
     "cors": "^2.8.5",

src/modules/mcp/services/mcp.ts

@@ -96,7 +96,6 @@ enum ToolName {
 }
 
 // MCP Apps constants
-const RESOURCE_URI_META_KEY = "ui/resourceUri";
 const HELLO_WORLD_APP_URI = "ui://hello-world/app.html";
 
 enum PromptName {
@@ -492,7 +491,7 @@ export const createMcpServer = (): McpServerWrapper => {
         description:
           "Demonstrates MCP Apps - returns an interactive UI that runs in the client",
         inputSchema: { type: "object", properties: {} },
-        _meta: { [RESOURCE_URI_META_KEY]: HELLO_WORLD_APP_URI },
+        _meta: { ui: { resourceUri: HELLO_WORLD_APP_URI } },
       },
     ];
 
@@ -767,7 +766,19 @@ export const createMcpServer = (): McpServerWrapper => {
             text: "If this client supports MCP Apps, an interactive UI should have rendered for the user.",
           },
         ],
-        _meta: { [RESOURCE_URI_META_KEY]: HELLO_WORLD_APP_URI },
+        structuredContent: {
+          greeting: "Hello from MCP Apps!",
+          timestamp: new Date().toISOString(),
+          features: ["interactive UI", "bidirectional communication", "theme support"],
+          stats: {
+            version: "1.0.0",
+            requestCount: Math.floor(Math.random() * 1000),
+          },
+        },
+        _meta: {
+          exampleKey: "exampleValue",
+          processed: true,
+        },
       };
     }