feat: restart MCP servers on /mcp refresh (#5479)

Co-authored-by: Brian Ray <62354532+emeryray2002@users.noreply.github.com>
Co-authored-by: N. Taylor Mullen <ntaylormullen@google.com>

packages/cli/src/ui/commands/mcpCommand.test.ts

@@ -972,6 +972,7 @@ describe('mcpCommand', () => {
     it('should refresh the list of tools and display the status', async () => {
       const mockToolRegistry = {
         discoverMcpTools: vi.fn(),
+        restartMcpServers: vi.fn(),
         getAllTools: vi.fn().mockReturnValue([]),
       };
       const mockGeminiClient = {
@@ -1004,11 +1005,11 @@ describe('mcpCommand', () => {
       expect(context.ui.addItem).toHaveBeenCalledWith(
         {
           type: 'info',
-          text: 'Refreshing MCP servers and tools...',
+          text: 'Restarting MCP servers...',
         },
         expect.any(Number),
       );
-      expect(mockToolRegistry.discoverMcpTools).toHaveBeenCalled();
+      expect(mockToolRegistry.restartMcpServers).toHaveBeenCalled();
       expect(mockGeminiClient.setTools).toHaveBeenCalled();
       expect(context.ui.reloadCommands).toHaveBeenCalledTimes(1);
 

packages/cli/src/ui/commands/mcpCommand.ts

@@ -471,7 +471,7 @@ const listCommand: SlashCommand = {
 
 const refreshCommand: SlashCommand = {
   name: 'refresh',
-  description: 'Refresh the list of MCP servers and tools',
+  description: 'Restarts MCP servers.',
   kind: CommandKind.BUILT_IN,
   action: async (
     context: CommandContext,
@@ -497,12 +497,12 @@ const refreshCommand: SlashCommand = {
     context.ui.addItem(
       {
         type: 'info',
-        text: 'Refreshing MCP servers and tools...',
+        text: 'Restarting MCP servers...',
       },
       Date.now(),
     );
 
-    await toolRegistry.discoverMcpTools();
+    await toolRegistry.restartMcpServers();
 
     // Update the client with the new tools
     const geminiClient = config.getGeminiClient();

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

@@ -63,6 +63,12 @@ describe('handleAtCommand', () => {
         isPathWithinWorkspace: () => true,
         getDirectories: () => [testRootDir],
       }),
+      getMcpServers: () => ({}),
+      getMcpServerCommand: () => undefined,
+      getPromptRegistry: () => ({
+        getPromptsByServer: () => [],
+      }),
+      getDebugMode: () => false,
     } as unknown as Config;
 
     const registry = new ToolRegistry(mockConfig);