diff --git a/packages/core/src/utils/errors.test.ts b/packages/core/src/utils/errors.test.ts
index b4e07718965..f56d2088971 100644
--- a/packages/core/src/utils/errors.test.ts
+++ b/packages/core/src/utils/errors.test.ts
@@ -47,6 +47,30 @@ describe('getErrorMessage', () => {
     };
     expect(getErrorMessage(error)).toBe('Bad Request Message');
   });
+
+  it('should remove a trailing period from URLs in error messages', () => {
+    const error = new Error('Migrate to https://antigravity.google.');
+
+    expect(getErrorMessage(error)).toBe(
+      'Migrate to https://antigravity.google',
+    );
+  });
+
+  it('should preserve periods that do not trail a URL', () => {
+    expect(getErrorMessage(new Error('Authentication failed.'))).toBe(
+      'Authentication failed.',
+    );
+  });
+
+  it.each([null, undefined])(
+    'should handle an Error with a nullish message',
+    (message) => {
+      const error = new Error('original');
+      Object.defineProperty(error, 'message', { value: message });
+
+      expect(getErrorMessage(error)).toBe('');
+    },
+  );
 });
 
 describe('isAbortError', () => {
diff --git a/packages/core/src/utils/errors.ts b/packages/core/src/utils/errors.ts
index ca3637a358c..8e9b0a4de2b 100644
--- a/packages/core/src/utils/errors.ts
+++ b/packages/core/src/utils/errors.ts
@@ -33,10 +33,16 @@ export function isAbortError(error: unknown): boolean {
   return error instanceof Error && error.name === 'AbortError';
 }
 
+function stripTrailingPeriodsFromUrls(
+  message: string | null | undefined,
+): string {
+  return message?.replace(/(https?:\/\/\S+)\.(?=\s|$)/g, '$1') ?? '';
+}
+
 export function getErrorMessage(error: unknown): string {
   const friendlyError = toFriendlyError(error);
   if (friendlyError instanceof Error) {
-    return friendlyError.message;
+    return stripTrailingPeriodsFromUrls(friendlyError.message);
   }
   if (
     typeof friendlyError === 'object' &&
@@ -45,10 +51,11 @@ export function getErrorMessage(error: unknown): string {
     typeof (friendlyError as { message: unknown }).message === 'string'
   ) {
     // eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion
-    return (friendlyError as { message: string }).message;
+    const message = (friendlyError as { message: string }).message;
+    return stripTrailingPeriodsFromUrls(message);
   }
   try {
-    return String(friendlyError);
+    return stripTrailingPeriodsFromUrls(String(friendlyError));
   } catch {
     return 'Failed to get error details';
   }