diff --git a/doc/source/dev/tool_state.md b/doc/source/dev/tool_state.md
deleted file mode 100644
index e69de29bb2d1..000000000000
diff --git a/lib/galaxy/tool_util/parameters/_types.py b/lib/galaxy/tool_util/parameters/_types.py
index 59d42279df72..682b26bb22ea 100644
--- a/lib/galaxy/tool_util/parameters/_types.py
+++ b/lib/galaxy/tool_util/parameters/_types.py
@@ -16,18 +16,10 @@
 )
 
 # https://stackoverflow.com/questions/56832881/check-if-a-field-is-typing-optional
-# Python >= 3.8
-try:
-    from typing import get_args  # type: ignore[attr-defined,unused-ignore]
-    from typing import get_origin  # type: ignore[attr-defined,unused-ignore]
-# Compatibility
-except ImportError:
-
-    def get_args(tp: Any) -> tuple:
-        return getattr(tp, "__args__", ()) if tp is not Generic else Generic  # type: ignore[return-value,assignment,unused-ignore]
-
-    def get_origin(tp: Any) -> Optional[Any]:  # type: ignore[no-redef,unused-ignore]
-        return getattr(tp, "__origin__", None)
+from typing_extensions import (
+    get_args,
+    get_origin,
+)
 
 
 def optional_if_needed(type: Type, is_optional: bool) -> Type:
diff --git a/lib/galaxy/tool_util/parameters/factory.py b/lib/galaxy/tool_util/parameters/factory.py
index 072e98328309..0b28e7da3288 100644
--- a/lib/galaxy/tool_util/parameters/factory.py
+++ b/lib/galaxy/tool_util/parameters/factory.py
@@ -12,6 +12,7 @@
     PagesSource,
     ToolSource,
 )
+from galaxy.util import string_as_bool
 from .models import (
     BooleanParameterModel,
     ColorParameterModel,
@@ -156,8 +157,6 @@ def _from_input_source_galaxy(input_source: InputSource) -> ToolParameterT:
         for value, case_inputs_sources in input_source.parse_when_input_sources():
             if isinstance(test_parameter, BooleanParameterModel):
                 # TODO: investigate truevalue/falsevalue when...
-                from galaxy.util import string_as_bool
-
                 typed_value = string_as_bool(value)
             else:
                 typed_value = value
@@ -175,7 +174,6 @@ def _from_input_source_galaxy(input_source: InputSource) -> ToolParameterT:
             whens=whens,
         )
     elif input_type == "repeat":
-        # TODO: min/max
         name = input_source.get("name")
         # title = input_source.get("title")
         # help = input_source.get("help", None)
diff --git a/lib/galaxy/tool_util/parameters/models.py b/lib/galaxy/tool_util/parameters/models.py
index d81e6256bddb..49635c4e7187 100644
--- a/lib/galaxy/tool_util/parameters/models.py
+++ b/lib/galaxy/tool_util/parameters/models.py
@@ -140,7 +140,6 @@ class BaseGalaxyToolParameterModelDefinition(BaseToolParameterModelDefinition):
     label: Optional[str] = None
     help: Optional[str] = None
     argument: Optional[str] = None
-    refresh_on_change: bool = False
     is_dynamic: bool = False
     optional: bool = False