diff --git a/packages/cli/src/utils/errors.ts b/packages/cli/src/utils/errors.ts
index 9d4789b7e4..913fc0d562 100644
--- a/packages/cli/src/utils/errors.ts
+++ b/packages/cli/src/utils/errors.ts
@@ -19,6 +19,7 @@ import {
   debugLogger,
   coreEvents,
   getErrorMessage,
+  getErrorType,
 } from '@google/gemini-cli-core';
 import { runSyncCleanup } from './cleanup.js';
 
@@ -82,7 +83,7 @@ export function handleError(
       timestamp: new Date().toISOString(),
       status: 'error',
       error: {
-        type: error instanceof Error ? error.constructor.name : 'Error',
+        type: getErrorType(error),
         message: errorMessage,
       },
       stats: streamFormatter.convertToStreamStats(metrics, 0),
@@ -177,7 +178,7 @@ export function handleCancellationError(config: Config): never {
       timestamp: new Date().toISOString(),
       status: 'error',
       error: {
-        type: 'FatalCancellationError',
+        type: getErrorType(cancellationError),
         message: cancellationError.message,
       },
       stats: streamFormatter.convertToStreamStats(metrics, 0),
@@ -218,7 +219,7 @@ export function handleMaxTurnsExceededError(config: Config): never {
       timestamp: new Date().toISOString(),
       status: 'error',
       error: {
-        type: 'FatalTurnLimitedError',
+        type: getErrorType(maxTurnsError),
         message: maxTurnsError.message,
       },
       stats: streamFormatter.convertToStreamStats(metrics, 0),
diff --git a/packages/core/src/code_assist/setup.ts b/packages/core/src/code_assist/setup.ts
index 5e94aee8c7..a68a1ec550 100644
--- a/packages/core/src/code_assist/setup.ts
+++ b/packages/core/src/code_assist/setup.ts
@@ -32,6 +32,7 @@ export class ProjectIdRequiredError extends Error {
     super(
       'This account requires setting the GOOGLE_CLOUD_PROJECT or GOOGLE_CLOUD_PROJECT_ID env var. See https://goo.gle/gemini-cli-auth-docs#workspace-gca',
     );
+    this.name = 'ProjectIdRequiredError';
   }
 }
 
@@ -42,6 +43,7 @@ export class ProjectIdRequiredError extends Error {
 export class ValidationCancelledError extends Error {
   constructor() {
     super('User cancelled account validation');
+    this.name = 'ValidationCancelledError';
   }
 }
 
@@ -51,6 +53,7 @@ export class IneligibleTierError extends Error {
   constructor(ineligibleTiers: IneligibleTier[]) {
     const reasons = ineligibleTiers.map((t) => t.reasonMessage).join(', ');
     super(reasons);
+    this.name = 'IneligibleTierError';
     this.ineligibleTiers = ineligibleTiers;
   }
 }
diff --git a/packages/core/src/utils/errors.test.ts b/packages/core/src/utils/errors.test.ts
index 63aa4628fb..b4e0771896 100644
--- a/packages/core/src/utils/errors.test.ts
+++ b/packages/core/src/utils/errors.test.ts
@@ -355,12 +355,29 @@ describe('getErrorType', () => {
     expect(getErrorType(undefined)).toBe('unknown');
   });
 
-  it('should strip leading underscores from error names', () => {
-    class _GaxiosError extends Error {}
+  it('should use explicitly set error names', () => {
+    class _GaxiosError extends Error {
+      constructor(message: string) {
+        super(message);
+        this.name = 'GaxiosError';
+      }
+    }
     expect(getErrorType(new _GaxiosError('test'))).toBe('GaxiosError');
 
-    const errorWithUnderscoreName = new Error('test');
-    errorWithUnderscoreName.name = '_CodeBuddyError';
-    expect(getErrorType(errorWithUnderscoreName)).toBe('CodeBuddyError');
+    class BadRequestError3 extends Error {
+      constructor(message: string) {
+        super(message);
+        this.name = 'BadRequestError';
+      }
+    }
+    expect(getErrorType(new BadRequestError3('test'))).toBe('BadRequestError');
+
+    class _AbortError2 extends Error {
+      constructor(message: string) {
+        super(message);
+        this.name = 'AbortError';
+      }
+    }
+    expect(getErrorType(new _AbortError2('test'))).toBe('AbortError');
   });
 });
diff --git a/packages/core/src/utils/errors.ts b/packages/core/src/utils/errors.ts
index 834d1e4586..210902029b 100644
--- a/packages/core/src/utils/errors.ts
+++ b/packages/core/src/utils/errors.ts
@@ -57,9 +57,11 @@ export function getErrorMessage(error: unknown): string {
 export function getErrorType(error: unknown): string {
   if (!(error instanceof Error)) return 'unknown';
 
-  // Return constructor name if the generic 'Error' name is used (for custom errors)
+  // Use the constructor name if the standard error name is missing or generic.
   const name =
-    error.name === 'Error' ? (error.constructor?.name ?? 'Error') : error.name;
+    error.name && error.name !== 'Error'
+      ? error.name
+      : (error.constructor?.name ?? 'Error');
 
   // Strip leading underscore from error names. Bundlers like esbuild sometimes
   // rename classes to avoid scope collisions.
@@ -72,42 +74,50 @@ export class FatalError extends Error {
     readonly exitCode: number,
   ) {
     super(message);
+    this.name = 'FatalError';
   }
 }
 
 export class FatalAuthenticationError extends FatalError {
   constructor(message: string) {
     super(message, 41);
+    this.name = 'FatalAuthenticationError';
   }
 }
 export class FatalInputError extends FatalError {
   constructor(message: string) {
     super(message, 42);
+    this.name = 'FatalInputError';
   }
 }
 export class FatalSandboxError extends FatalError {
   constructor(message: string) {
     super(message, 44);
+    this.name = 'FatalSandboxError';
   }
 }
 export class FatalConfigError extends FatalError {
   constructor(message: string) {
     super(message, 52);
+    this.name = 'FatalConfigError';
   }
 }
 export class FatalTurnLimitedError extends FatalError {
   constructor(message: string) {
     super(message, 53);
+    this.name = 'FatalTurnLimitedError';
   }
 }
 export class FatalToolExecutionError extends FatalError {
   constructor(message: string) {
     super(message, 54);
+    this.name = 'FatalToolExecutionError';
   }
 }
 export class FatalCancellationError extends FatalError {
   constructor(message: string) {
     super(message, 130); // Standard exit code for SIGINT
+    this.name = 'FatalCancellationError';
   }
 }
 
@@ -118,7 +128,12 @@ export class CanceledError extends Error {
   }
 }
 
-export class ForbiddenError extends Error {}
+export class ForbiddenError extends Error {
+  constructor(message: string) {
+    super(message);
+    this.name = 'ForbiddenError';
+  }
+}
 export class AccountSuspendedError extends ForbiddenError {
   readonly appealUrl?: string;
   readonly appealLinkText?: string;
@@ -130,8 +145,18 @@ export class AccountSuspendedError extends ForbiddenError {
     this.appealLinkText = metadata?.['appeal_url_link_text'];
   }
 }
-export class UnauthorizedError extends Error {}
-export class BadRequestError extends Error {}
+export class UnauthorizedError extends Error {
+  constructor(message: string) {
+    super(message);
+    this.name = 'UnauthorizedError';
+  }
+}
+export class BadRequestError extends Error {
+  constructor(message: string) {
+    super(message);
+    this.name = 'BadRequestError';
+  }
+}
 
 export class ChangeAuthRequestedError extends Error {
   constructor() {
@@ -264,10 +289,7 @@ export function isAuthenticationError(error: unknown): boolean {
   }
 
   // Check for UnauthorizedError class (from MCP SDK or our own)
-  if (
-    error instanceof Error &&
-    error.constructor.name === 'UnauthorizedError'
-  ) {
+  if (error instanceof Error && error.name === 'UnauthorizedError') {
     return true;
   }