feat: Add support for MCP Resources (#13178)

Co-authored-by: Jack Wotherspoon <jackwoth@google.com>

packages/cli/src/ui/hooks/useAtCompletion.test.ts

@@ -49,6 +49,9 @@ describe('useAtCompletion', () => {
       })),
       getEnableRecursiveFileSearch: () => true,
       getFileFilteringDisableFuzzySearch: () => false,
+      getResourceRegistry: vi.fn().mockReturnValue({
+        getAllResources: () => [],
+      }),
     } as unknown as Config;
     vi.clearAllMocks();
   });
@@ -174,6 +177,34 @@ describe('useAtCompletion', () => {
     });
   });
 
+  describe('MCP resource suggestions', () => {
+    it('should include MCP resources in the suggestion list using fuzzy matching', async () => {
+      mockConfig.getResourceRegistry = vi.fn().mockReturnValue({
+        getAllResources: () => [
+          {
+            serverName: 'server-1',
+            uri: 'file:///tmp/server-1/logs.txt',
+            name: 'logs',
+            discoveredAt: Date.now(),
+          },
+        ],
+      });
+
+      const { result } = renderHook(() =>
+        useTestHarnessForAtCompletion(true, 'logs', mockConfig, '/tmp'),
+      );
+
+      await waitFor(() => {
+        expect(
+          result.current.suggestions.some(
+            (suggestion) =>
+              suggestion.value === 'server-1:file:///tmp/server-1/logs.txt',
+          ),
+        ).toBe(true);
+      });
+    });
+  });
+
   describe('UI State and Loading Behavior', () => {
     it('should be in a loading state during initial file system crawl', async () => {
       testRootDir = await createTmpDir({});