fix(auth): Return empty map if token file does not exits, and refacto… (#12332)

Co-authored-by: Sandy Tao <sandytao520@icloud.com>

packages/core/src/mcp/token-storage/file-token-storage.test.ts

@@ -58,12 +58,11 @@ describe('FileTokenStorage', () => {
   });
 
   describe('getCredentials', () => {
-    it('should throw error when file does not exist', async () => {
+    it('should return null when file does not exist', async () => {
       mockFs.readFile.mockRejectedValue({ code: 'ENOENT' });
 
-      await expect(storage.getCredentials('test-server')).rejects.toThrow(
-        'Token file does not exist',
-      );
+      const result = await storage.getCredentials('test-server');
+      expect(result).toBeNull();
     });
 
     it('should return null for expired tokens', async () => {
@@ -179,7 +178,7 @@ describe('FileTokenStorage', () => {
       mockFs.readFile.mockRejectedValue({ code: 'ENOENT' });
 
       await expect(storage.deleteCredentials('test-server')).rejects.toThrow(
-        'Token file does not exist',
+        'No credentials found for test-server',
       );
     });
 
@@ -246,12 +245,11 @@ describe('FileTokenStorage', () => {
   });
 
   describe('listServers', () => {
-    it('should throw error when file does not exist', async () => {
+    it('should return empty list when file does not exist', async () => {
       mockFs.readFile.mockRejectedValue({ code: 'ENOENT' });
 
-      await expect(storage.listServers()).rejects.toThrow(
-        'Token file does not exist',
-      );
+      const result = await storage.listServers();
+      expect(result).toEqual([]);
     });
 
     it('should return list of server names', async () => {

packages/core/src/mcp/token-storage/file-token-storage.ts

@@ -77,7 +77,7 @@ export class FileTokenStorage extends BaseTokenStorage {
     } catch (error: unknown) {
       const err = error as NodeJS.ErrnoException & { message?: string };
       if (err.code === 'ENOENT') {
-        throw new Error('Token file does not exist');
+        return new Map();
       }
       if (
         err.message?.includes('Invalid encrypted data format') ||

packages/core/src/mcp/token-storage/keychain-token-storage.ts

@@ -46,8 +46,8 @@ export class KeychainTokenStorage
       const moduleName = 'keytar';
       const module = await import(moduleName);
       this.keytarModule = module.default || module;
-    } catch (error) {
-      coreEvents.emitFeedback('error', "Failed to load 'keytar' module", error);
+    } catch (_) {
+      //Keytar is optional so we shouldn't raise an error of log anything.
     }
     return this.keytarModule;
   }