Summarize extensions and MCP servers on startup (#3977)

packages/cli/src/config/config.ts

@@ -22,7 +22,7 @@ import {
 } from '@google/gemini-cli-core';
 import { Settings } from './settings.js';
 
-import { Extension, filterActiveExtensions } from './extension.js';
+import { Extension, annotateActiveExtensions } from './extension.js';
 import { getCliVersion } from '../utils/version.js';
 import { loadSandboxConfig } from './sandboxConfig.js';
 
@@ -252,11 +252,15 @@ export async function loadCliConfig(
     process.env.TERM_PROGRAM === 'vscode' &&
     !process.env.SANDBOX;
 
-  const activeExtensions = filterActiveExtensions(
+  const allExtensions = annotateActiveExtensions(
     extensions,
     argv.extensions || [],
   );
 
+  const activeExtensions = extensions.filter(
+    (_, i) => allExtensions[i].isActive,
+  );
+
   // Set the context filename in the server's memoryTool module BEFORE loading memory
   // TODO(b/343434939): This is a bit of a hack. The contextFileName should ideally be passed
   // directly to the Config constructor in core, and have core handle setGeminiMdFilename.
@@ -283,6 +287,7 @@ export async function loadCliConfig(
 
   let mcpServers = mergeMcpServers(settings, activeExtensions);
   const excludeTools = mergeExcludeTools(settings, activeExtensions);
+  const blockedMcpServers: Array<{ name: string; extensionName: string }> = [];
 
   if (!argv.allowedMcpServerNames) {
     if (settings.allowMCPServers) {
@@ -308,9 +313,24 @@ export async function loadCliConfig(
     const allowedNames = new Set(argv.allowedMcpServerNames.filter(Boolean));
     if (allowedNames.size > 0) {
       mcpServers = Object.fromEntries(
-        Object.entries(mcpServers).filter(([key]) => allowedNames.has(key)),
+        Object.entries(mcpServers).filter(([key, server]) => {
+          const isAllowed = allowedNames.has(key);
+          if (!isAllowed) {
+            blockedMcpServers.push({
+              name: key,
+              extensionName: server.extensionName || '',
+            });
+          }
+          return isAllowed;
+        }),
       );
     } else {
+      blockedMcpServers.push(
+        ...Object.entries(mcpServers).map(([key, server]) => ({
+          name: key,
+          extensionName: server.extensionName || '',
+        })),
+      );
       mcpServers = {};
     }
   }
@@ -403,10 +423,8 @@ export async function loadCliConfig(
     maxSessionTurns: settings.maxSessionTurns ?? -1,
     experimentalAcp: argv.experimentalAcp || false,
     listExtensions: argv.listExtensions || false,
-    activeExtensions: activeExtensions.map((e) => ({
-      name: e.config.name,
-      version: e.config.version,
-    })),
+    extensions: allExtensions,
+    blockedMcpServers,
     noBrowser: !!process.env.NO_BROWSER,
     summarizeToolOutput: settings.summarizeToolOutput,
     ideMode,
@@ -424,7 +442,10 @@ function mergeMcpServers(settings: Settings, extensions: Extension[]) {
           );
           return;
         }
-        mcpServers[key] = server;
+        mcpServers[key] = {
+          ...server,
+          extensionName: extension.config.name,
+        };
       },
     );
   }

packages/cli/src/config/extension.test.ts

@@ -11,7 +11,7 @@ import * as path from 'path';
 import {
   EXTENSIONS_CONFIG_FILENAME,
   EXTENSIONS_DIRECTORY_NAME,
-  filterActiveExtensions,
+  annotateActiveExtensions,
   loadExtensions,
 } from './extension.js';
 
@@ -86,42 +86,52 @@ describe('loadExtensions', () => {
   });
 });
 
-describe('filterActiveExtensions', () => {
+describe('annotateActiveExtensions', () => {
   const extensions = [
     { config: { name: 'ext1', version: '1.0.0' }, contextFiles: [] },
     { config: { name: 'ext2', version: '1.0.0' }, contextFiles: [] },
     { config: { name: 'ext3', version: '1.0.0' }, contextFiles: [] },
   ];
 
-  it('should return all extensions if no enabled extensions are provided', () => {
-    const activeExtensions = filterActiveExtensions(extensions, []);
+  it('should mark all extensions as active if no enabled extensions are provided', () => {
+    const activeExtensions = annotateActiveExtensions(extensions, []);
     expect(activeExtensions).toHaveLength(3);
+    expect(activeExtensions.every((e) => e.isActive)).toBe(true);
   });
 
-  it('should return only the enabled extensions', () => {
-    const activeExtensions = filterActiveExtensions(extensions, [
+  it('should mark only the enabled extensions as active', () => {
+    const activeExtensions = annotateActiveExtensions(extensions, [
       'ext1',
       'ext3',
     ]);
-    expect(activeExtensions).toHaveLength(2);
-    expect(activeExtensions.some((e) => e.config.name === 'ext1')).toBe(true);
-    expect(activeExtensions.some((e) => e.config.name === 'ext3')).toBe(true);
+    expect(activeExtensions).toHaveLength(3);
+    expect(activeExtensions.find((e) => e.name === 'ext1')?.isActive).toBe(
+      true,
+    );
+    expect(activeExtensions.find((e) => e.name === 'ext2')?.isActive).toBe(
+      false,
+    );
+    expect(activeExtensions.find((e) => e.name === 'ext3')?.isActive).toBe(
+      true,
+    );
   });
 
-  it('should return no extensions when "none" is provided', () => {
-    const activeExtensions = filterActiveExtensions(extensions, ['none']);
-    expect(activeExtensions).toHaveLength(0);
+  it('should mark all extensions as inactive when "none" is provided', () => {
+    const activeExtensions = annotateActiveExtensions(extensions, ['none']);
+    expect(activeExtensions).toHaveLength(3);
+    expect(activeExtensions.every((e) => !e.isActive)).toBe(true);
   });
 
   it('should handle case-insensitivity', () => {
-    const activeExtensions = filterActiveExtensions(extensions, ['EXT1']);
-    expect(activeExtensions).toHaveLength(1);
-    expect(activeExtensions[0].config.name).toBe('ext1');
+    const activeExtensions = annotateActiveExtensions(extensions, ['EXT1']);
+    expect(activeExtensions.find((e) => e.name === 'ext1')?.isActive).toBe(
+      true,
+    );
   });
 
   it('should log an error for unknown extensions', () => {
-    const consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
-    filterActiveExtensions(extensions, ['ext4']);
+    const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
+    annotateActiveExtensions(extensions, ['ext4']);
     expect(consoleSpy).toHaveBeenCalledWith('Extension not found: ext4');
     consoleSpy.mockRestore();
   });

packages/cli/src/config/extension.ts

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import { MCPServerConfig } from '@google/gemini-cli-core';
+import { MCPServerConfig, GeminiCLIExtension } from '@google/gemini-cli-core';
 import * as fs from 'fs';
 import * as path from 'path';
 import * as os from 'os';
@@ -34,9 +34,6 @@ export function loadExtensions(workspaceDir: string): Extension[] {
   const uniqueExtensions = new Map<string, Extension>();
   for (const extension of allExtensions) {
     if (!uniqueExtensions.has(extension.config.name)) {
-      console.log(
-        `Loading extension: ${extension.config.name} (version: ${extension.config.version})`,
-      );
       uniqueExtensions.set(extension.config.name, extension);
     }
   }
@@ -113,12 +110,18 @@ function getContextFileNames(config: ExtensionConfig): string[] {
   return config.contextFileName;
 }
 
-export function filterActiveExtensions(
+export function annotateActiveExtensions(
   extensions: Extension[],
   enabledExtensionNames: string[],
-): Extension[] {
+): GeminiCLIExtension[] {
+  const annotatedExtensions: GeminiCLIExtension[] = [];
+
   if (enabledExtensionNames.length === 0) {
-    return extensions;
+    return extensions.map((extension) => ({
+      name: extension.config.name,
+      version: extension.config.version,
+      isActive: true,
+    }));
   }
 
   const lowerCaseEnabledExtensions = new Set(
@@ -129,31 +132,33 @@ export function filterActiveExtensions(
     lowerCaseEnabledExtensions.size === 1 &&
     lowerCaseEnabledExtensions.has('none')
   ) {
-    if (extensions.length > 0) {
-      console.log('All extensions are disabled.');
-    }
-    return [];
+    return extensions.map((extension) => ({
+      name: extension.config.name,
+      version: extension.config.version,
+      isActive: false,
+    }));
   }
 
-  const activeExtensions: Extension[] = [];
   const notFoundNames = new Set(lowerCaseEnabledExtensions);
 
   for (const extension of extensions) {
     const lowerCaseName = extension.config.name.toLowerCase();
-    if (lowerCaseEnabledExtensions.has(lowerCaseName)) {
-      console.log(
-        `Activated extension: ${extension.config.name} (version: ${extension.config.version})`,
-      );
-      activeExtensions.push(extension);
+    const isActive = lowerCaseEnabledExtensions.has(lowerCaseName);
+
+    if (isActive) {
       notFoundNames.delete(lowerCaseName);
-    } else {
-      console.log(`Disabled extension: ${extension.config.name}`);
     }
+
+    annotatedExtensions.push({
+      name: extension.config.name,
+      version: extension.config.version,
+      isActive,
+    });
   }
 
   for (const requestedName of notFoundNames) {
-    console.log(`Extension not found: ${requestedName}`);
+    console.error(`Extension not found: ${requestedName}`);
   }
 
-  return activeExtensions;
+  return annotatedExtensions;
 }