Currently the following works:

public class TracePointTypeConverterTest extends CamelTestSupport {

     @Test

     public void lookup() {

          assertNotNull(context.getTypeConverterRegistry().lookup(SomeObject.class, AnotherObject.class));

     }

}

@Converter

public class MyTypeConverter {

   @Converter

   public SomeObject convert(AnotherObject obj, Exchange exg) {

       String foo = exg.getIn().getHeader("foo", String.class);

       // do something

   }

}

This however does not work and the unit test fails:

@Converter

public class MyTypeConverter {

   @Converter

   public SomeObject convert(AnotherObject obj, @Header("foo") String foo, ...) {

       // do something

   }

}