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.continue/rules/symfony-dto-validation-strategy.md

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+---
+globs: "**/UI/**/*.php, **/Logic/**/DTO/*.php"
+description: Defines the standard for input validation in Symfony 7 projects.
+  Logic layer DTOs hold the validation rules via attributes. The UI layer is
+  responsible for executing the validation using the injected validator service,
+  ensuring clean separation of concerns and preventing invalid data from
+  entering the business logic.
+alwaysApply: false
+---
+
+All input validation must be performed on DTOs located in /src/Logic/[FeatureName]/DTO using PHP 8 #[Assert\...] attributes. Controllers in the UI layer (/src/UI/...) must inject Symfony\Component\Validator\Validator\ValidatorInterface, validate the DTO before passing it to UseCases, and handle validation errors immediately.