diff --git a/tiramisu/api.py b/tiramisu/api.py
index d0742cf..8fd7c10 100644
--- a/tiramisu/api.py
+++ b/tiramisu/api.py
@@ -24,7 +24,7 @@ from .error import APIError, ConfigError, SlaveError, PropertiesOptionError
 from .i18n import _
 from .setting import ConfigBag, OptionBag, owners, groups, Undefined, undefined, FORBIDDEN_SET_PROPERTIES
 from .config import Config, SubConfig, GroupConfig, MetaConfig
-from .option import ChoiceOption
+from .option import ChoiceOption, OptionDescription
 
 
 TIRAMISU_VERSION = 3
@@ -1013,36 +1013,52 @@ class TiramisuContextOption(TiramisuContext):
              group_type=None,
              recursive=False):
         """list content of an optiondescription"""
-        # FIXME should return TiramisuOption !!!
+        def _filter(opt):
+            if not self.config_bag.force_unrestraint:
+                name = opt.impl_getname()
+                option_bag = OptionBag()
+                option_bag.set_option(opt,
+                                      name,
+                                      None,
+                                      self.config_bag)
+                self.config_bag.config.getattr(name,
+                                               option_bag)
+        if type not in ('all', 'optiondescription'):
+            raise APIError(_('unknown list type {}').format(type))
         if group_type is not None and not isinstance(group_type,
                                                      groups.GroupType):
             raise TypeError(_("unknown group_type: {0}").format(group_type))
 
-        if type == 'optiondescription':
-            if recursive:
-                raise APIError(_('not implemented yet'))
-            else:
-                if not self.config_bag.force_unrestraint:
-                    option = self.config_bag.config.cfgimpl_get_description()
-                    for opt in option.impl_getchildren(self.config_bag):
-                        if type == 'optiondescription' and not opt.impl_is_optiondescription():
-                            continue
-                        yield opt.impl_getname()
-                else:
-                    # FIXME itergroups !!!
-                    return self.config_bag.config.iter_groups(self.config_bag, group_type)
-        elif type == 'all':
+        if recursive:
             if group_type:
+                raise APIError(_('recursive with group_type is not implemented yet'))
+            if not self.config_bag.force_unrestraint:
                 raise APIError(_('not implemented yet'))
-            if recursive:
-                if not self.config_bag.force_unrestraint:
-                    raise APIError(_('not implemented yet'))
-                else:
-                    return self.config_bag.config.cfgimpl_get_description()._cache_paths[1]
-            else:
-                return self.config_bag.config.cfgimpl_get_children(self.config_bag)
+            for option in self.config_bag.config.cfgimpl_get_description()._cache_paths[1]:
+                if type == 'optiondescription' and not isinstance(option, OptionDescription):
+                    continue
+                yield option
+
         else:
-            raise APIError(_('unknown list type {}').format(type))
+            option = self.config_bag.config.cfgimpl_get_description()
+            for opt in option.impl_getchildren(self.config_bag):
+                try:
+                    subsubconfig = _filter(opt)
+                except PropertiesOptionError:
+                    continue
+                if opt.impl_is_optiondescription():
+                    if type == 'optiondescription' and \
+                            (group_type and opt.impl_get_group_type() != group_type):
+                        continue
+                else:
+                    if type == 'optiondescription':
+                        continue
+                name = opt.impl_getname()
+                yield TiramisuOption(name,
+                                     self.config_bag.config._get_subpath(name),
+                                     None,
+                                     self.config_bag.config,
+                                     self.config_bag)
 
 
 class TiramisuContextConfig(TiramisuContext):