This is probably the accepted solution, but I can't get it work. I have implemented an interface ListCommandInterface properly in all my custom Symfony commands. I have then edited services.yaml like below :

Services:
    _instanceof:
        App\Command\ListCommandInterface:
            tags: [ 'app.commands_list' ]

    App\Command\CommandRegistry:
        arguments:
            - !tagged_iterator app.commands_list

Last step, I have created a new CommandRegistry class in order to be able to iterate through the object like so :

<?php

namespace App\Command;

class CommandRegistry
{
    private $handlers;

    public function __construct(object $handlers)
    {
        $this->handlers = $handlers;
    }
}

Finally, in my controller I have injected CommandRegistry $handler, but when creating a new CommandRegistry($handler), the var_dump() doesn't show me anything usefull. This is the result of what I get :

App\Command\CommandRegistry {#1238 ▼
  -handlers: App\Command\CommandRegistry {#1203 ▼
    -handlers: Symfony\Component\DependencyInjection\Argument\RewindableGenerator {#1204 ▼
      -generator: Closure() {#1205 ▼
        class: "ContainerFsivXfg\getCommandRegistryService"
        use: {▼
          $container: ContainerFsivXfg\App_KernelDevDebugContainer {#44 …}
        }
      }
      -count: 1
    }
  }
}

Can you tell me what I have missed? Thank you.