Add a plugin manager definition lister tool

Create the Plugin Definition Lister Service

namespace Drupal\ai_agents\Service;

use Drupal\Component\Plugin\PluginManagerInterface;

class PluginDefinitionLister {

  /**
   * Lists plugin definitions for a given plugin manager service ID.
   *
   * @param string $service_id
   *   The service ID of the plugin manager.
   *
   * @return array
   *   An array of plugin definitions.
   */
  public function listDefinitions(string $service_id): array {
    if (!\Drupal::hasService($service_id)) {
      throw new \InvalidArgumentException("Plugin manager service '$service_id' not found.");
    }

    $manager = \Drupal::service($service_id);
    if (!$manager instanceof PluginManagerInterface) {
      throw new \InvalidArgumentException("Service '$service_id' is not a valid plugin manager.");
    }

    return $manager->getDefinitions();
  }
}

Automatically closed - issue fixed for 2 weeks with no activity.