fix: Remove StrEnum due to versioning

Author: vincent0426

src/mcp/server/elicitation.py

@@ -4,7 +4,7 @@
 
 import types
 from collections.abc import Sequence
-from enum import Enum, StrEnum
+from enum import Enum
 from typing import Generic, Literal, TypeVar, Union, get_args, get_origin
 
 from pydantic import BaseModel
@@ -47,7 +47,7 @@ class AcceptedUrlElicitation(BaseModel):
 
 
 # Primitive types allowed in elicitation schemas
-_ELICITATION_PRIMITIVE_TYPES = (str, int, float, bool, StrEnum)
+_ELICITATION_PRIMITIVE_TYPES = (str, int, float, bool, Enum)
 
 
 def _validate_elicitation_schema(schema: type[BaseModel]) -> None:

tests/server/fastmcp/test_elicitation.py

@@ -2,7 +2,7 @@
 Test the elicitation feature using stdio transport.
 """
 
-from enum import StrEnum
+from enum import Enum
 from typing import Any
 
 import pytest
@@ -149,7 +149,7 @@ async def elicitation_callback(
             assert field_name in result.content[0].text
 
     # Test valid Enum types (should not fail validation)
-    class Status(StrEnum):
+    class Status(str, Enum):
         ACTIVE = "active"
         INACTIVE = "inactive"