Add support for updating extension sources and names (#21715)

docs/extensions/reference.md

@@ -123,6 +123,7 @@ The manifest file defines the extension's behavior and configuration.
   },
   "contextFileName": "GEMINI.md",
   "excludeTools": ["run_shell_command"],
+  "migratedTo": "https://github.com/new-owner/new-extension-repo",
   "plan": {
     "directory": ".gemini/plans"
   }
@@ -138,6 +139,9 @@ The manifest file defines the extension's behavior and configuration.
 - `version`: The version of the extension.
 - `description`: A short description of the extension. This will be displayed on
   [geminicli.com/extensions](https://geminicli.com/extensions).
+- `migratedTo`: The URL of the new repository source for the extension. If this
+  is set, the CLI will automatically check this new source for updates and
+  migrate the extension's installation to the new source if an update is found.
 - `mcpServers`: A map of MCP servers to settings. The key is the name of the
   server, and the value is the server configuration. These servers will be
   loaded on startup just like MCP servers defined in a

docs/extensions/releasing.md

@@ -152,3 +152,29 @@ jobs:
             release/linux.arm64.my-tool.tar.gz
             release/win32.arm64.my-tool.zip
 ```
+
+## Migrating an Extension Repository
+
+If you need to move your extension to a new repository (e.g., from a personal
+account to an organization) or rename it, you can use the `migratedTo` property
+in your `gemini-extension.json` file to seamlessly transition your users.
+
+1. **Create the new repository**: Setup your extension in its new location.
+2. **Update the old repository**: In your original repository, update the
+   `gemini-extension.json` file to include the `migratedTo` property, pointing
+   to the new repository URL, and bump the version number. You can optionally
+   change the `name` of your extension at this time in the new repository.
+   ```json
+   {
+     "name": "my-extension",
+     "version": "1.1.0",
+     "migratedTo": "https://github.com/new-owner/new-extension-repo"
+   }
+   ```
+3. **Release the update**: Publish this new version in your old repository.
+
+When users check for updates, the Gemini CLI will detect the `migratedTo` field,
+verify that the new repository contains a valid extension update, and
+automatically update their local installation to track the new source and name
+moving forward. All extension settings will automatically migrate to the new
+installation.

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

@@ -345,4 +345,144 @@ describe('ExtensionManager', () => {
       }
     });
   });
+
+  describe('Extension Renaming', () => {
+    it('should support renaming an extension during update', async () => {
+      // 1. Setup existing extension
+      const oldName = 'old-name';
+      const newName = 'new-name';
+      const extDir = path.join(userExtensionsDir, oldName);
+      fs.mkdirSync(extDir, { recursive: true });
+      fs.writeFileSync(
+        path.join(extDir, 'gemini-extension.json'),
+        JSON.stringify({ name: oldName, version: '1.0.0' }),
+      );
+      fs.writeFileSync(
+        path.join(extDir, 'metadata.json'),
+        JSON.stringify({ type: 'local', source: extDir }),
+      );
+
+      await extensionManager.loadExtensions();
+
+      // 2. Create a temporary "new" version with a different name
+      const newSourceDir = fs.mkdtempSync(
+        path.join(tempHomeDir, 'new-source-'),
+      );
+      fs.writeFileSync(
+        path.join(newSourceDir, 'gemini-extension.json'),
+        JSON.stringify({ name: newName, version: '1.1.0' }),
+      );
+      fs.writeFileSync(
+        path.join(newSourceDir, 'metadata.json'),
+        JSON.stringify({ type: 'local', source: newSourceDir }),
+      );
+
+      // 3. Update the extension
+      await extensionManager.installOrUpdateExtension(
+        { type: 'local', source: newSourceDir },
+        { name: oldName, version: '1.0.0' },
+      );
+
+      // 4. Verify old directory is gone and new one exists
+      expect(fs.existsSync(path.join(userExtensionsDir, oldName))).toBe(false);
+      expect(fs.existsSync(path.join(userExtensionsDir, newName))).toBe(true);
+
+      // Verify the loaded state is updated
+      const extensions = extensionManager.getExtensions();
+      expect(extensions.some((e) => e.name === newName)).toBe(true);
+      expect(extensions.some((e) => e.name === oldName)).toBe(false);
+    });
+
+    it('should carry over enablement status when renaming', async () => {
+      const oldName = 'old-name';
+      const newName = 'new-name';
+      const extDir = path.join(userExtensionsDir, oldName);
+      fs.mkdirSync(extDir, { recursive: true });
+      fs.writeFileSync(
+        path.join(extDir, 'gemini-extension.json'),
+        JSON.stringify({ name: oldName, version: '1.0.0' }),
+      );
+      fs.writeFileSync(
+        path.join(extDir, 'metadata.json'),
+        JSON.stringify({ type: 'local', source: extDir }),
+      );
+
+      // Enable it
+      const enablementManager = extensionManager.getEnablementManager();
+      enablementManager.enable(oldName, true, tempHomeDir);
+
+      await extensionManager.loadExtensions();
+      const extension = extensionManager.getExtensions()[0];
+      expect(extension.isActive).toBe(true);
+
+      const newSourceDir = fs.mkdtempSync(
+        path.join(tempHomeDir, 'new-source-'),
+      );
+      fs.writeFileSync(
+        path.join(newSourceDir, 'gemini-extension.json'),
+        JSON.stringify({ name: newName, version: '1.1.0' }),
+      );
+      fs.writeFileSync(
+        path.join(newSourceDir, 'metadata.json'),
+        JSON.stringify({ type: 'local', source: newSourceDir }),
+      );
+
+      await extensionManager.installOrUpdateExtension(
+        { type: 'local', source: newSourceDir },
+        { name: oldName, version: '1.0.0' },
+      );
+
+      // Verify new name is enabled
+      expect(enablementManager.isEnabled(newName, tempHomeDir)).toBe(true);
+      // Verify old name is removed from enablement
+      expect(enablementManager.readConfig()[oldName]).toBeUndefined();
+    });
+
+    it('should prevent renaming if the new name conflicts with an existing extension', async () => {
+      // Setup two extensions
+      const ext1Dir = path.join(userExtensionsDir, 'ext1');
+      fs.mkdirSync(ext1Dir, { recursive: true });
+      fs.writeFileSync(
+        path.join(ext1Dir, 'gemini-extension.json'),
+        JSON.stringify({ name: 'ext1', version: '1.0.0' }),
+      );
+      fs.writeFileSync(
+        path.join(ext1Dir, 'metadata.json'),
+        JSON.stringify({ type: 'local', source: ext1Dir }),
+      );
+
+      const ext2Dir = path.join(userExtensionsDir, 'ext2');
+      fs.mkdirSync(ext2Dir, { recursive: true });
+      fs.writeFileSync(
+        path.join(ext2Dir, 'gemini-extension.json'),
+        JSON.stringify({ name: 'ext2', version: '1.0.0' }),
+      );
+      fs.writeFileSync(
+        path.join(ext2Dir, 'metadata.json'),
+        JSON.stringify({ type: 'local', source: ext2Dir }),
+      );
+
+      await extensionManager.loadExtensions();
+
+      // Try to update ext1 to name 'ext2'
+      const newSourceDir = fs.mkdtempSync(
+        path.join(tempHomeDir, 'new-source-'),
+      );
+      fs.writeFileSync(
+        path.join(newSourceDir, 'gemini-extension.json'),
+        JSON.stringify({ name: 'ext2', version: '1.1.0' }),
+      );
+      fs.writeFileSync(
+        path.join(newSourceDir, 'metadata.json'),
+        JSON.stringify({ type: 'local', source: newSourceDir }),
+      );
+
+      await expect(
+        extensionManager.installOrUpdateExtension(
+          { type: 'local', source: newSourceDir },
+          { name: 'ext1', version: '1.0.0' },
+        ),
+      ).rejects.toThrow(/already installed/);
+    });
+  });
 });

packages/cli/src/config/extension-manager.ts

@@ -129,6 +129,10 @@ export class ExtensionManager extends ExtensionLoader {
     this.requestSetting = options.requestSetting ?? undefined;
   }
 
+  getEnablementManager(): ExtensionEnablementManager {
+    return this.extensionEnablementManager;
+  }
+
   setRequestConsent(
     requestConsent: (consent: string) => Promise<boolean>,
   ): void {
@@ -271,17 +275,28 @@ Would you like to attempt to install via "git clone" instead?`,
         newExtensionConfig = await this.loadExtensionConfig(localSourcePath);
 
         const newExtensionName = newExtensionConfig.name;
+        const previousName = previousExtensionConfig?.name ?? newExtensionName;
         const previous = this.getExtensions().find(
-          (installed) => installed.name === newExtensionName,
+          (installed) => installed.name === previousName,
         );
+        const nameConflict = this.getExtensions().find(
+          (installed) =>
+            installed.name === newExtensionName &&
+            installed.name !== previousName,
+        );
+
         if (isUpdate && !previous) {
           throw new Error(
-            `Extension "${newExtensionName}" was not already installed, cannot update it.`,
+            `Extension "${previousName}" was not already installed, cannot update it.`,
           );
         } else if (!isUpdate && previous) {
           throw new Error(
             `Extension "${newExtensionName}" is already installed. Please uninstall it first.`,
           );
+        } else if (isUpdate && nameConflict) {
+          throw new Error(
+            `Cannot update to "${newExtensionName}" because an extension with that name is already installed.`,
+          );
         }
 
         const newHasHooks = fs.existsSync(
@@ -298,6 +313,11 @@ Would you like to attempt to install via "git clone" instead?`,
           path.join(localSourcePath, 'skills'),
         );
         const previousSkills = previous?.skills ?? [];
+        const isMigrating = Boolean(
+          previous &&
+            previous.installMetadata &&
+            previous.installMetadata.source !== installMetadata.source,
+        );
 
         await maybeRequestConsentOrFail(
           newExtensionConfig,
@@ -307,19 +327,46 @@ Would you like to attempt to install via "git clone" instead?`,
           previousHasHooks,
           newSkills,
           previousSkills,
+          isMigrating,
         );
         const extensionId = getExtensionId(newExtensionConfig, installMetadata);
         const destinationPath = new ExtensionStorage(
           newExtensionName,
         ).getExtensionDir();
+
+        if (
+          (!isUpdate || newExtensionName !== previousName) &&
+          fs.existsSync(destinationPath)
+        ) {
+          throw new Error(
+            `Cannot install extension "${newExtensionName}" because a directory with that name already exists. Please remove it manually.`,
+          );
+        }
+
         let previousSettings: Record<string, string> | undefined;
-        if (isUpdate) {
+        let wasEnabledGlobally = false;
+        let wasEnabledWorkspace = false;
+        if (isUpdate && previousExtensionConfig) {
+          const previousExtensionId = previous?.installMetadata
+            ? getExtensionId(previousExtensionConfig, previous.installMetadata)
+            : extensionId;
           previousSettings = await getEnvContents(
             previousExtensionConfig,
-            extensionId,
+            previousExtensionId,
             this.workspaceDir,
           );
-          await this.uninstallExtension(newExtensionName, isUpdate);
+          if (newExtensionName !== previousName) {
+            wasEnabledGlobally = this.extensionEnablementManager.isEnabled(
+              previousName,
+              homedir(),
+            );
+            wasEnabledWorkspace = this.extensionEnablementManager.isEnabled(
+              previousName,
+              this.workspaceDir,
+            );
+            this.extensionEnablementManager.remove(previousName);
+          }
+          await this.uninstallExtension(previousName, isUpdate);
         }
 
         await fs.promises.mkdir(destinationPath, { recursive: true });
@@ -392,6 +439,18 @@ Would you like to attempt to install via "git clone" instead?`,
               CoreToolCallStatus.Success,
             ),
           );
+
+          if (newExtensionName !== previousName) {
+            if (wasEnabledGlobally) {
+              await this.enableExtension(newExtensionName, SettingScope.User);
+            }
+            if (wasEnabledWorkspace) {
+              await this.enableExtension(
+                newExtensionName,
+                SettingScope.Workspace,
+              );
+            }
+          }
         } else {
           await logExtensionInstallEvent(
             this.telemetryConfig,
@@ -873,6 +932,7 @@ Would you like to attempt to install via "git clone" instead?`,
         path: effectiveExtensionPath,
         contextFiles,
         installMetadata,
+        migratedTo: config.migratedTo,
         mcpServers: config.mcpServers,
         excludeTools: config.excludeTools,
         hooks,

packages/cli/src/config/extension.ts

@@ -42,6 +42,10 @@ export interface ExtensionConfig {
      */
     directory?: string;
   };
+  /**
+   * Used to migrate an extension to a new repository source.
+   */
+  migratedTo?: string;
 }
 
 export interface ExtensionUpdateInfo {

packages/cli/src/config/extensions/__snapshots__/consent-consent-maybeRequestConsentOrFail-consent-string-generation-should-request-consent-if-extension-is-migrated.snap.svg

@@ -0,0 +1,13 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="920" height="122" viewBox="0 0 920 122">
+  <style>
+    text { font-family: Consolas, "Courier New", monospace; font-size: 14px; dominant-baseline: text-before-edge; white-space: pre; }
+  </style>
+  <rect width="920" height="122" fill="#000000" />
+  <g transform="translate(10, 10)">
+    <text x="0" y="2" fill="#ffffff" textLength="900" lengthAdjust="spacingAndGlyphs">Migrating extension &quot;old-ext&quot; to a new repository, renaming to &quot;test-ext&quot;, and installing updates.  </text>
+    <text x="0" y="36" fill="#cdcd00" textLength="891" lengthAdjust="spacingAndGlyphs">The extension you are about to install may have been created by a third-party developer and sourced</text>
+    <text x="0" y="53" fill="#cdcd00" textLength="882" lengthAdjust="spacingAndGlyphs">from a public repository. Google does not vet, endorse, or guarantee the functionality or security</text>
+    <text x="0" y="70" fill="#cdcd00" textLength="846" lengthAdjust="spacingAndGlyphs">of extensions. Please carefully inspect any extension and its source code before installing to</text>
+    <text x="0" y="87" fill="#cdcd00" textLength="630" lengthAdjust="spacingAndGlyphs">understand the permissions it requires and the actions it may perform.</text>
+  </g>
+</svg>

packages/cli/src/config/extensions/__snapshots__/consent.test.ts.snap

@@ -24,6 +24,15 @@ of extensions. Please carefully inspect any extension and its source code before
 understand the permissions it requires and the actions it may perform."
 `;
 
+exports[`consent > maybeRequestConsentOrFail > consent string generation > should request consent if extension is migrated 1`] = `
+"Migrating extension "old-ext" to a new repository, renaming to "test-ext", and installing updates.
+
+The extension you are about to install may have been created by a third-party developer and sourced
+from a public repository. Google does not vet, endorse, or guarantee the functionality or security
+of extensions. Please carefully inspect any extension and its source code before installing to
+understand the permissions it requires and the actions it may perform."
+`;
+
 exports[`consent > maybeRequestConsentOrFail > consent string generation > should request consent if skills change 1`] = `
 "Installing extension "test-ext".
 This extension will run the following MCP servers:

packages/cli/src/config/extensions/consent.test.ts

@@ -287,6 +287,25 @@ describe('consent', () => {
         expect(requestConsent).toHaveBeenCalledTimes(1);
       });
 
+      it('should request consent if extension is migrated', async () => {
+        const requestConsent = vi.fn().mockResolvedValue(true);
+        await maybeRequestConsentOrFail(
+          baseConfig,
+          requestConsent,
+          false,
+          { ...baseConfig, name: 'old-ext' },
+          false,
+          [],
+          [],
+          true,
+        );
+
+        expect(requestConsent).toHaveBeenCalledTimes(1);
+        let consentString = requestConsent.mock.calls[0][0] as string;
+        consentString = normalizePathsForSnapshot(consentString, tempDir);
+        await expectConsentSnapshot(consentString);
+      });
+
       it('should request consent if skills change', async () => {
         const skill1Dir = path.join(tempDir, 'skill1');
         const skill2Dir = path.join(tempDir, 'skill2');

packages/cli/src/config/extensions/consent.ts

@@ -148,11 +148,30 @@ async function extensionConsentString(
   extensionConfig: ExtensionConfig,
   hasHooks: boolean,
   skills: SkillDefinition[] = [],
+  previousName?: string,
+  wasMigrated?: boolean,
 ): Promise<string> {
   const sanitizedConfig = escapeAnsiCtrlCodes(extensionConfig);
   const output: string[] = [];
   const mcpServerEntries = Object.entries(sanitizedConfig.mcpServers || {});
-  output.push(`Installing extension "${sanitizedConfig.name}".`);
+
+  if (wasMigrated) {
+    if (previousName && previousName !== sanitizedConfig.name) {
+      output.push(
+        `Migrating extension "${previousName}" to a new repository, renaming to "${sanitizedConfig.name}", and installing updates.`,
+      );
+    } else {
+      output.push(
+        `Migrating extension "${sanitizedConfig.name}" to a new repository and installing updates.`,
+      );
+    }
+  } else if (previousName && previousName !== sanitizedConfig.name) {
+    output.push(
+      `Renaming extension "${previousName}" to "${sanitizedConfig.name}" and installing updates.`,
+    );
+  } else {
+    output.push(`Installing extension "${sanitizedConfig.name}".`);
+  }
 
   if (mcpServerEntries.length) {
     output.push('This extension will run the following MCP servers:');
@@ -231,11 +250,14 @@ export async function maybeRequestConsentOrFail(
   previousHasHooks?: boolean,
   skills: SkillDefinition[] = [],
   previousSkills: SkillDefinition[] = [],
+  isMigrating: boolean = false,
 ) {
   const extensionConsent = await extensionConsentString(
     extensionConfig,
     hasHooks,
     skills,
+    previousExtensionConfig?.name,
+    isMigrating,
   );
   if (previousExtensionConfig) {
     const previousExtensionConsent = await extensionConsentString(

packages/cli/src/config/extensions/github.test.ts

@@ -285,6 +285,23 @@ describe('github.ts', () => {
         ExtensionUpdateState.NOT_UPDATABLE,
       );
     });
+
+    it('should check migratedTo source if present and return UPDATE_AVAILABLE', async () => {
+      mockGit.getRemotes.mockResolvedValue([
+        { name: 'origin', refs: { fetch: 'new-url' } },
+      ]);
+      mockGit.listRemote.mockResolvedValue('hash\tHEAD');
+      mockGit.revparse.mockResolvedValue('hash');
+
+      const ext = {
+        path: '/path',
+        migratedTo: 'new-url',
+        installMetadata: { type: 'git', source: 'old-url' },
+      } as unknown as GeminiCLIExtension;
+      expect(await checkForExtensionUpdate(ext, mockExtensionManager)).toBe(
+        ExtensionUpdateState.UPDATE_AVAILABLE,
+      );
+    });
   });
 
   describe('downloadFromGitHubRelease', () => {

packages/cli/src/config/extensions/github.ts

@@ -203,6 +203,24 @@ export async function checkForExtensionUpdate(
   ) {
     return ExtensionUpdateState.NOT_UPDATABLE;
   }
+
+  if (extension.migratedTo) {
+    const migratedState = await checkForExtensionUpdate(
+      {
+        ...extension,
+        installMetadata: { ...installMetadata, source: extension.migratedTo },
+        migratedTo: undefined,
+      },
+      extensionManager,
+    );
+    if (
+      migratedState === ExtensionUpdateState.UPDATE_AVAILABLE ||
+      migratedState === ExtensionUpdateState.UP_TO_DATE
+    ) {
+      return ExtensionUpdateState.UPDATE_AVAILABLE;
+    }
+  }
+
   try {
     if (installMetadata.type === 'git') {
       const git = simpleGit(extension.path);

packages/cli/src/config/extensions/update.test.ts

@@ -184,6 +184,54 @@ describe('Extension Update Logic', () => {
       });
     });
 
+    it('should migrate source if migratedTo is set and an update is available', async () => {
+      vi.mocked(mockExtensionManager.loadExtensionConfig).mockReturnValue(
+        Promise.resolve({
+          name: 'test-extension',
+          version: '1.0.0',
+        }),
+      );
+      vi.mocked(
+        mockExtensionManager.installOrUpdateExtension,
+      ).mockResolvedValue({
+        ...mockExtension,
+        version: '1.1.0',
+      });
+      vi.mocked(checkForExtensionUpdate).mockResolvedValue(
+        ExtensionUpdateState.UPDATE_AVAILABLE,
+      );
+
+      const extensionWithMigratedTo = {
+        ...mockExtension,
+        migratedTo: 'https://new-source.com/repo.git',
+      };
+
+      await updateExtension(
+        extensionWithMigratedTo,
+        mockExtensionManager,
+        ExtensionUpdateState.UPDATE_AVAILABLE,
+        mockDispatch,
+      );
+
+      expect(checkForExtensionUpdate).toHaveBeenCalledWith(
+        expect.objectContaining({
+          installMetadata: expect.objectContaining({
+            source: 'https://new-source.com/repo.git',
+          }),
+        }),
+        mockExtensionManager,
+      );
+
+      expect(
+        mockExtensionManager.installOrUpdateExtension,
+      ).toHaveBeenCalledWith(
+        expect.objectContaining({
+          source: 'https://new-source.com/repo.git',
+        }),
+        expect.anything(),
+      );
+    });
+
     it('should set state to UPDATED if enableExtensionReloading is true', async () => {
       vi.mocked(mockExtensionManager.loadExtensionConfig).mockReturnValue(
         Promise.resolve({

packages/cli/src/config/extensions/update.ts

@@ -55,6 +55,24 @@ export async function updateExtension(
     });
     throw new Error(`Extension is linked so does not need to be updated`);
   }
+
+  if (extension.migratedTo) {
+    const migratedState = await checkForExtensionUpdate(
+      {
+        ...extension,
+        installMetadata: { ...installMetadata, source: extension.migratedTo },
+        migratedTo: undefined,
+      },
+      extensionManager,
+    );
+    if (
+      migratedState === ExtensionUpdateState.UPDATE_AVAILABLE ||
+      migratedState === ExtensionUpdateState.UP_TO_DATE
+    ) {
+      installMetadata.source = extension.migratedTo;
+    }
+  }
+
   const originalVersion = extension.version;
 
   const tempDir = await ExtensionStorage.createTmpDir();

packages/core/src/config/config.ts

@@ -361,6 +361,10 @@ export interface GeminiCLIExtension {
      */
     directory?: string;
   };
+  /**
+   * Used to migrate an extension to a new repository source.
+   */
+  migratedTo?: string;
 }
 
 export interface ExtensionInstallMetadata {

pr-description.md

@@ -0,0 +1,65 @@
+## Summary
+
+This PR implements a seamless migration path for extensions to move to a new
+repository and optionally change their name without stranding existing users.
+
+When an extension author sets the `migratedTo` field in their
+`gemini-extension.json` and publishes an update to their old repository, the CLI
+will detect this during the next update check. The CLI will then automatically
+download the extension from the new repository, explicitly warn the user about
+the migration (and any renaming) during the consent step, and seamlessly migrate
+the installation and enablement status while cleaning up the old installation.
+
+## Details
+
+- **Configuration:** Added `migratedTo` property to `ExtensionConfig` and
+  `GeminiCLIExtension` to track the new repository URL.
+- **Update checking & downloading:** Updated `checkForExtensionUpdate` and
+  `updateExtension` to inspect the `migratedTo` field. If present, the CLI
+  queries the new repository URL for an update and swaps the installation source
+  so the update resolves from the new location.
+- **Migration & renaming logic (`ExtensionManager`):**
+  - `installOrUpdateExtension` now fully supports renaming. It transfers global
+    and workspace enablement states from the old extension name to the new one
+    and deletes the old extension directory.
+  - Added safeguards to block renaming if the new name conflicts with a
+    different, already-installed extension or if the destination directory
+    already exists.
+  - Exposed `getEnablementManager()` to `ExtensionManager` for better typing
+    during testing.
+- **Consent messaging:** Refactored `maybeRequestConsentOrFail` to compute an
+  `isMigrating` flag (by detecting a change in the installation source). The
+  `extensionConsentString` output now explicitly informs users with messages
+  like: _"Migrating extension 'old-name' to a new repository, renaming to
+  'new-name', and installing updates."_
+- **Documentation:** Documented the `migratedTo` field in
+  `docs/extensions/reference.md` and added a comprehensive guide in
+  `docs/extensions/releasing.md` explaining how extension maintainers can
+  transition users using this feature.
+- **Testing:** Added extensive unit tests across `extension-manager.test.ts`,
+  `consent.test.ts`, `github.test.ts`, and `update.test.ts` to cover the new
+  migration and renaming logic.
+
+## Related issues
+
+N/A
+
+## How to validate
+
+1. **Unit tests:** Run all related tests to confirm everything passes:
+   ```bash
+   npm run test -w @google/gemini-cli -- src/config/extensions/github.test.ts
+   npm run test -w @google/gemini-cli -- src/config/extensions/update.test.ts
+   npm run test -w @google/gemini-cli -- src/config/extensions/consent.test.ts
+   npm run test -w @google/gemini-cli -- src/config/extension-manager.test.ts
+   ```
+2. **End-to-end migration test:**
+   - Install a local or git extension.
+   - Update its `gemini-extension.json` to include a `migratedTo` field pointing
+     to a _different_ test repository.
+   - Run `gemini extensions check` to confirm it detects the update from the new
+     source.
+   - Run `gemini extensions update <extension>`.
+   - Verify that the consent prompt explicitly mentions the migration.
+   - Verify that the new extension is installed, the old directory is deleted,
+     and its enablement status carried over.