diff --git a/app/controllers/discourse_ai/ai_helper/assistant_controller.rb b/app/controllers/discourse_ai/ai_helper/assistant_controller.rb
index 52b61115..a17df448 100644
--- a/app/controllers/discourse_ai/ai_helper/assistant_controller.rb
+++ b/app/controllers/discourse_ai/ai_helper/assistant_controller.rb
@@ -72,7 +72,11 @@ module DiscourseAi
 
         RateLimiter.new(current_user, "ai_assistant", 6, 3.minutes).performed!
 
-        render json: DiscourseAi::AiHelper::SemanticCategorizer.new(params[:text]).categories,
+        render json:
+                 DiscourseAi::AiHelper::SemanticCategorizer.new(
+                   params[:text],
+                   current_user,
+                 ).categories,
                status: 200
       end
 
@@ -81,7 +85,9 @@ module DiscourseAi
 
         RateLimiter.new(current_user, "ai_assistant", 6, 3.minutes).performed!
 
-        render json: DiscourseAi::AiHelper::SemanticCategorizer.new(params[:text]).tags, status: 200
+        render json:
+                 DiscourseAi::AiHelper::SemanticCategorizer.new(params[:text], current_user).tags,
+               status: 200
       end
 
       private
diff --git a/lib/modules/ai_helper/semantic_categorizer.rb b/lib/modules/ai_helper/semantic_categorizer.rb
index 34528ab9..5acb3f5b 100644
--- a/lib/modules/ai_helper/semantic_categorizer.rb
+++ b/lib/modules/ai_helper/semantic_categorizer.rb
@@ -2,7 +2,8 @@
 module DiscourseAi
   module AiHelper
     class SemanticCategorizer
-      def initialize(text)
+      def initialize(text, user)
+        @user = user
         @text = text
       end
 
@@ -22,6 +23,7 @@ module DiscourseAi
         ::Topic
           .joins(:category)
           .where(id: candidate_ids)
+          .where("categories.id IN (?)", Category.topic_create_allowed(@user.guardian).pluck(:id))
           .order("array_position(ARRAY#{candidate_ids}, topics.id)")
           .pluck("categories.slug")
           .map
@@ -52,6 +54,7 @@ module DiscourseAi
         ::Topic
           .joins(:topic_tags, :tags)
           .where(id: candidate_ids)
+          .where("tags.id IN (?)", DiscourseTagging.visible_tags(@user.guardian).pluck(:id))
           .group("topics.id")
           .order("array_position(ARRAY#{candidate_ids}, topics.id)")
           .pluck("array_agg(tags.name)")