CDI supports producer methods which accept the InjectionPoint as argument which allows to access all metadata to the injection point. The InjectionPoint approach adds a certain complexity which is not needed when only qualifier metadata has to be processed. I propose to allow annotation types within the producer method signatures. Code example for a use case:

@HttpParam("username") @Inject String username

import javax.enterprise.inject.Produces;
import javax.enterprise.inject.spi.InjectionPoint;

class HttpParams
  @Produces

  String getParamValue(HttpParam httpParam) {

     ServletRequest request = (ServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest();
	  
     return request.getParameter(httpParam.value());
	  
     // current support looks like:
     // String getParamValue(InjectionPoint ip) {
     // return request.getParameter(ip.getAnnotated().getAnnotation(HttpParam.class).value());

  }
}

Producer methods accepting qualifier annotations ensure to have always an annotation instance, this helps to prevent null pointer access since InjectionPoint.getAnnotated().getAnnotation(java.lang.Class<T>) may return null.