diff --git a/src/auth/auth.service.ts b/src/auth/auth.service.ts
index 8f8e741..cf7c415 100644
--- a/src/auth/auth.service.ts
+++ b/src/auth/auth.service.ts
@@ -256,8 +256,13 @@ export class AuthService {
           where: { id: user.id },
           data: { [providerIdField]: dto.providerId },
         });
+      } else if (dto.mode === 'login') {
+        // Login mode: user must exist
+        throw new BadRequestException(
+          'No account found with this email. Please sign up first.',
+        );
       } else {
-        // Create new user
+        // Create new user (signup mode)
         const role = dto.role === 'AGENT' ? UserRole.AGENT : UserRole.USER;
         const authProvider =
           dto.provider === 'google'
diff --git a/src/auth/dto/social-auth.dto.ts b/src/auth/dto/social-auth.dto.ts
index 4e14cdf..97a8637 100644
--- a/src/auth/dto/social-auth.dto.ts
+++ b/src/auth/dto/social-auth.dto.ts
@@ -65,4 +65,14 @@ export class SocialAuthDto {
   @IsOptional()
   @IsString()
   agentTypeId?: string;
+
+  @ApiPropertyOptional({
+    example: 'login',
+    description: 'Auth mode: login (existing users only) or signup (create if needed)',
+    enum: ['login', 'signup'],
+    default: 'signup',
+  })
+  @IsOptional()
+  @IsEnum(['login', 'signup'], { message: 'Mode must be login or signup' })
+  mode?: 'login' | 'signup';
 }
diff --git a/src/users/users.service.ts b/src/users/users.service.ts
index f2a3d89..39de069 100644
--- a/src/users/users.service.ts
+++ b/src/users/users.service.ts
@@ -487,15 +487,6 @@ export class UsersService {
       throw new BadRequestException('Profile is already verified');
     }
 
-    // Validate required fields are filled
-    const missingFields = await this.getRequiredFieldsMissing(user.agentProfile.id, user.agentProfile.agentTypeId);
-    if (missingFields.length > 0) {
-      throw new BadRequestException({
-        message: 'Please fill in all required fields before submitting',
-        missingFields,
-      });
-    }
-
     // Capture snapshot of current profile data + documents
     const profileSnapshot = await this.captureProfileSnapshot(user.agentProfile.id);