diff --git a/src/marvin/serializers.py b/src/marvin/serializers.py
index 122b85cb7..8a7c7422f 100644
--- a/src/marvin/serializers.py
+++ b/src/marvin/serializers.py
@@ -78,18 +78,15 @@ def create_tool_from_model(
 
 
 def create_vocabulary_from_type(
-    vocabulary: Union[GenericAlias, type, list[str]],
+    vocabulary: Union[GenericAlias, type],
 ) -> list[str]:
     if get_origin(vocabulary) == Literal:
         return [str(token) for token in get_args(vocabulary)]
     elif isinstance(vocabulary, type) and issubclass(vocabulary, Enum):
         return [str(token) for token in list(vocabulary.__members__.keys())]
-    elif isinstance(vocabulary, list) and next(iter(get_args(list[str])), None) == str:
-        return [str(token) for token in vocabulary]
     else:
         raise TypeError(
-            f"Expected Literal or Enum or list[str], got {type(vocabulary)} with value"
-            f" {vocabulary}"
+            f"Expected Literal or Enum, got {type(vocabulary)} with value {vocabulary}"
         )
 
 
diff --git a/tests/components/test_ai_classifier.py b/tests/components/test_ai_classifier.py
index 287a8b33c..034f53bf0 100644
--- a/tests/components/test_ai_classifier.py
+++ b/tests/components/test_ai_classifier.py
@@ -1,6 +1,5 @@
 from enum import Enum
 
-import pytest
 from marvin import ai_classifier
 from typing_extensions import Literal
 
@@ -16,7 +15,6 @@ class GitHubIssueTag(Enum):
     DOCS = "docs"
 
 
-@pytest.mark.skip(reason="ai_classifier doesnt really work imo")
 @pytest_mark_class("llm")
 class TestAIClassifer:
     class TestLiteral:
@@ -47,19 +45,3 @@ def labeler(text: str) -> GitHubIssueTag:
             result = labeler("improve the docs you slugs")
 
             assert result == GitHubIssueTag.DOCS
-
-    class TestList:
-        def test_ai_classifier_list_return_type(self):
-            @ai_classifier
-            def labeler(text: str) -> list[str]:
-                """Select from the following GitHub issue tags
-
-                - bug
-                - feature
-                - enhancement
-                - docs
-                """
-
-            result = labeler("i found a bug in the example from the docs")
-
-            assert set(result) == {"bug", "docs"}