diff --git a/doc/changelog.d/4973.fixed.md b/doc/changelog.d/4973.fixed.md
new file mode 100644
index 000000000000..4d311bbb4e5b
--- /dev/null
+++ b/doc/changelog.d/4973.fixed.md
@@ -0,0 +1 @@
+Make type annotations runtime-safe for bear-type compatibility
diff --git a/pyproject.toml b/pyproject.toml
index 606972420141..e184b3fe951a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,6 +20,7 @@ classifiers = [
 dependencies = [
     "ansys-api-fluent>=0.3.37",
     "ansys-platform-instancemanagement~=1.1",
+    "beartype>=0.18.0",
     "ansys-tools-common>=0.4.0",
     "ansys-tools-filetransfer>=0.2,<1.0",
     "ansys-units~=0.10.0",
diff --git a/src/ansys/fluent/core/__init__.py b/src/ansys/fluent/core/__init__.py
index cc94783aa26e..b1d7346957c3 100644
--- a/src/ansys/fluent/core/__init__.py
+++ b/src/ansys/fluent/core/__init__.py
@@ -22,6 +22,13 @@
 
 """A package providing Fluent's Solver and Meshing capabilities in Python."""
 
+# NOTE: beartype_this_package() is intentionally NOT used here.
+# `ansys` and `ansys.fluent` are implicit PEP 420 namespace packages
+# (no __init__.py at those levels). beartype's package-level hook
+# requires a regular package with __init__.py at the namespace root.
+# The @beartype decorator is applied manually to public API functions instead.
+# Upstream tracking: https://github.com/beartype/beartype/issues/286
+
 import os
 import pydoc
 import warnings
diff --git a/src/ansys/fluent/core/_types.py b/src/ansys/fluent/core/_types.py
index bf074d4253e0..8c2332ae0673 100644
--- a/src/ansys/fluent/core/_types.py
+++ b/src/ansys/fluent/core/_types.py
@@ -26,10 +26,8 @@
 This module centralizes reusable typing constructs
 """
 
-from __future__ import annotations
-
 import os
 from typing import TypeAlias
 
-PathType: TypeAlias = "os.PathLike[str] | os.PathLike[bytes] | str | bytes"
+PathType: TypeAlias = os.PathLike[str] | os.PathLike[bytes] | str | bytes
 """Type alias for file system paths."""
diff --git a/src/ansys/fluent/core/codegen/builtin_settingsgen.py b/src/ansys/fluent/core/codegen/builtin_settingsgen.py
index fe1039bb3c47..ff0fe7423105 100644
--- a/src/ansys/fluent/core/codegen/builtin_settingsgen.py
+++ b/src/ansys/fluent/core/codegen/builtin_settingsgen.py
@@ -116,9 +116,11 @@ def generate(version: str):
                 f.write(f", {named_object}: str")
             f.write(", settings_source: SettingsBase | Solver | None = None")
             if kind == "NonCreatableNamedObject":
-                f.write(", name: str = None")
+                f.write(", name: str | None = None")
             elif kind == "CreatableNamedObject":
-                f.write(", name: str = None, new_instance_name: str = None")
+                f.write(
+                    ", name: str | None = None, new_instance_name: str | None = None"
+                )
             f.write("):\n")
             f.write("        super().__init__(settings_source=settings_source")
             if kind == "NonCreatableNamedObject":
diff --git a/src/ansys/fluent/core/examples/downloads.py b/src/ansys/fluent/core/examples/downloads.py
index 199881d1c2b0..d1d894b12edd 100644
--- a/src/ansys/fluent/core/examples/downloads.py
+++ b/src/ansys/fluent/core/examples/downloads.py
@@ -73,7 +73,7 @@ def _get_file_url(file_name: str, directory: str | None = None) -> str:
 def _retrieve_file(
     url: str,
     file_name: str,
-    save_path: "PathType | None" = None,
+    save_path: PathType | None = None,
     return_without_path: bool | None = False,
 ) -> str:
     """Download specified file from specified URL."""
@@ -120,7 +120,7 @@ def _retrieve_file(
 def download_file(
     file_name: str,
     directory: str | None = None,
-    save_path: "PathType | None" = None,
+    save_path: PathType | None = None,
     return_without_path: bool | None = None,
 ) -> str:
     """Download specified example file from the Ansys example data repository.
diff --git a/src/ansys/fluent/core/field_data_interfaces.py b/src/ansys/fluent/core/field_data_interfaces.py
index 99da58d0164a..7f6ae8f74732 100644
--- a/src/ansys/fluent/core/field_data_interfaces.py
+++ b/src/ansys/fluent/core/field_data_interfaces.py
@@ -113,7 +113,7 @@ class BaseFieldInfo(ABC):
 
     @abstractmethod
     def get_scalar_field_range(
-        self, field: str, node_value: bool = False, surface_ids: List[int] = None
+        self, field: str, node_value: bool = False, surface_ids: List[int] | None = None
     ) -> List[float]:
         """
         Retrieve the range (minimum and maximum values) of a scalar field.
@@ -412,14 +412,14 @@ def __init__(self, available_field_names, field_info):
         self._field_info = field_info
 
     def range(
-        self, field: str, node_value: bool = False, surface_ids: list[int] = None
+        self, field: str, node_value: bool = False, surface_ids: list[int] | None = None
     ) -> list[float]:
         """Get the range (minimum and maximum values) of the field.
 
         Parameters
         ----------
         field: str
-            Field name
+            Field namex
         node_value: bool
         surface_ids : List[int], optional
             List of surface IDS for the surface data.
diff --git a/src/ansys/fluent/core/file_session.py b/src/ansys/fluent/core/file_session.py
index 8c7690a699d4..e06fecb212c0 100644
--- a/src/ansys/fluent/core/file_session.py
+++ b/src/ansys/fluent/core/file_session.py
@@ -966,7 +966,7 @@ def __init__(self, file_session):
         self._file_session = file_session
 
     def get_scalar_field_range(
-        self, field: str, node_value: bool = False, surface_ids: List[int] = None
+        self, field: str, node_value: bool = False, surface_ids: List[int] | None = None
     ) -> List[float]:
         """Get the range (minimum and maximum values) of the field.
 
@@ -990,7 +990,7 @@ def get_scalar_field_range(
         return self._get_scalar_field_range(field, node_value, surface_ids)
 
     def _get_scalar_field_range(
-        self, field: str, node_value: bool = False, surface_ids: List[int] = None
+        self, field: str, node_value: bool = False, surface_ids: List[int] | None = None
     ) -> List[float]:
         minimum = None
         maximum = None
diff --git a/src/ansys/fluent/core/filereader/case_file.py b/src/ansys/fluent/core/filereader/case_file.py
index cd0ad4a4e5d9..3518a4a5a92f 100644
--- a/src/ansys/fluent/core/filereader/case_file.py
+++ b/src/ansys/fluent/core/filereader/case_file.py
@@ -617,8 +617,8 @@ class CaseFile(RPVarProcessor):
 
     def __init__(
         self,
-        case_file_name: "PathType | None" = None,
-        project_file_name: "PathType | None" = None,
+        case_file_name: PathType | None = None,
+        project_file_name: PathType | None = None,
     ) -> None:
         """Initialize a CaseFile object. Exactly one file path argument must be
         specified.
diff --git a/src/ansys/fluent/core/fluent_connection.py b/src/ansys/fluent/core/fluent_connection.py
index 926f86d80222..f11c077e0bb4 100644
--- a/src/ansys/fluent/core/fluent_connection.py
+++ b/src/ansys/fluent/core/fluent_connection.py
@@ -22,8 +22,6 @@
 
 """Provides a module for Fluent connection functionality."""
 
-from __future__ import annotations
-
 from contextlib import suppress
 import ctypes
 from ctypes import c_int, sizeof
diff --git a/src/ansys/fluent/core/launcher/launcher.py b/src/ansys/fluent/core/launcher/launcher.py
index 0f8c149a404c..3e1a31106205 100644
--- a/src/ansys/fluent/core/launcher/launcher.py
+++ b/src/ansys/fluent/core/launcher/launcher.py
@@ -29,9 +29,11 @@
 import inspect
 import logging
 import os
-from typing import Any, Dict
+from typing import Any
 from warnings import warn
 
+from beartype import beartype
+
 from ansys.fluent.core._types import PathType
 from ansys.fluent.core.exceptions import DisallowedValuesError
 from ansys.fluent.core.fluent_connection import FluentConnection
@@ -77,8 +79,9 @@
 logger = logging.getLogger("pyfluent.launcher")
 
 
+@beartype
 def create_launcher(
-    fluent_launch_mode: LaunchMode = LaunchMode.STANDALONE, **kwargs
+    fluent_launch_mode: LaunchMode = LaunchMode.STANDALONE, **kwargs: Any
 ) -> DockerLauncher | PIMLauncher | SlurmLauncher | StandaloneLauncher:
     """Use the factory function to create a launcher for supported launch modes.
 
@@ -170,15 +173,16 @@ def _custom_converter_dimension(kwargs):
     version="v0.22.0",
     converter=_custom_converter_dimension,
 )
+@beartype
 def launch_fluent(
     product_version: FluentVersion | str | float | int | None = None,
     dimension: Dimension | int | None = None,
     precision: Precision | str | None = None,
     processor_count: int | None = None,
     journal_file_names: None | str | list[str] = None,
-    start_timeout: int = None,
+    start_timeout: int | None = None,
     additional_arguments: str = "",
-    env: Dict[str, Any] | None = None,
+    env: dict[str, Any] | None = None,
     start_container: bool | None = None,
     container_dict: dict | None = None,
     dry_run: bool = False,
@@ -188,14 +192,14 @@ def launch_fluent(
     graphics_driver: (
         FluentWindowsGraphicsDriver | FluentLinuxGraphicsDriver | str | None
     ) = None,
-    case_file_name: "PathType | None" = None,
-    case_data_file_name: "PathType | None" = None,
+    case_file_name: PathType | None = None,
+    case_data_file_name: PathType | None = None,
     lightweight_mode: bool | None = None,
     mode: FluentMode | str | None = None,
     py: bool | None = None,
     gpu: bool | list[int] | None = None,
-    cwd: "PathType | None" = None,
-    fluent_path: "PathType | None" = None,
+    cwd: PathType | None = None,
+    fluent_path: PathType | None = None,
     topy: str | list | None = None,
     start_watchdog: bool | None = None,
     scheduler_options: dict | None = None,
@@ -410,6 +414,7 @@ def _mode_to_launcher_type(fluent_launch_mode: LaunchMode):
     return launcher()
 
 
+@beartype
 def connect_to_fluent(
     ip: str | None = None,
     port: int | None = None,
diff --git a/src/ansys/fluent/core/launcher/slurm_launcher.py b/src/ansys/fluent/core/launcher/slurm_launcher.py
index 85ed7a636d6b..bedff9918650 100644
--- a/src/ansys/fluent/core/launcher/slurm_launcher.py
+++ b/src/ansys/fluent/core/launcher/slurm_launcher.py
@@ -321,7 +321,7 @@ def done(self) -> bool:
         return self._get_state() in ["", "CANCELLED", "COMPLETED"]
 
     def result(
-        self, timeout: int = None
+        self, timeout: int | None = None
     ) -> Meshing | PureMeshing | Solver | SolverIcing:
         """Return the session instance corresponding to the Fluent launch. If Fluent
         hasn't yet launched, then this method will wait up to timeout seconds. If Fluent
@@ -345,7 +345,7 @@ def result(
         """
         return self._future.result(timeout)
 
-    def exception(self, timeout: int = None) -> Exception:
+    def exception(self, timeout: int | None = None) -> Exception:
         """Return the exception raised by the Fluent launch. If Fluent hasn't yet
         launched, then this method will wait up to timeout seconds. If Fluent hasn't
         launched in timeout seconds, then a TimeoutError will be raised. If timeout is
@@ -397,13 +397,13 @@ def __init__(
         env: Dict[str, Any] | None = None,
         cleanup_on_exit: bool = True,
         start_transcript: bool = True,
-        case_file_name: "PathType | None" = None,
-        case_data_file_name: "PathType | None" = None,
+        case_file_name: PathType | None = None,
+        case_data_file_name: PathType | None = None,
         lightweight_mode: bool | None = None,
         py: bool | None = None,
         gpu: bool | None = None,
-        cwd: "PathType | None" = None,
-        fluent_path: "PathType | None" = None,
+        cwd: PathType | None = None,
+        fluent_path: PathType | None = None,
         topy: str | list | None = None,
         start_watchdog: bool | None = None,
         scheduler_options: dict | None = None,
diff --git a/src/ansys/fluent/core/launcher/standalone_launcher.py b/src/ansys/fluent/core/launcher/standalone_launcher.py
index 7812a2534586..3aac2fb1f161 100644
--- a/src/ansys/fluent/core/launcher/standalone_launcher.py
+++ b/src/ansys/fluent/core/launcher/standalone_launcher.py
@@ -40,7 +40,9 @@
 import os
 from pathlib import Path
 import subprocess
-from typing import Any, Dict
+from typing import Any
+
+from beartype import beartype
 
 from ansys.fluent.core._types import PathType
 from ansys.fluent.core.launcher.error_handler import (
@@ -77,12 +79,13 @@
 class StandaloneLauncher:
     """Instantiates Fluent session in standalone mode."""
 
+    @beartype
     def __init__(
         self,
         mode: FluentMode | str | None = None,
         ui_mode: UIMode | str | None = None,
         graphics_driver: (
-            FluentWindowsGraphicsDriver | FluentLinuxGraphicsDriver | str
+            FluentWindowsGraphicsDriver | FluentLinuxGraphicsDriver | str | None
         ) = None,
         product_version: FluentVersion | str | float | int | None = None,
         dimension: Dimension | int | None = None,
@@ -91,17 +94,17 @@ def __init__(
         journal_file_names: None | str | list[str] = None,
         start_timeout: int = 60,
         additional_arguments: str = "",
-        env: Dict[str, Any] | None = None,
+        env: dict[str, Any] | None = None,
         cleanup_on_exit: bool = True,
         dry_run: bool = False,
         start_transcript: bool = True,
-        case_file_name: "PathType | None" = None,
-        case_data_file_name: "PathType | None" = None,
+        case_file_name: PathType | None = None,
+        case_data_file_name: PathType | None = None,
         lightweight_mode: bool | None = None,
         py: bool | None = None,
         gpu: bool | None = None,
-        cwd: "PathType | None" = None,
-        fluent_path: "PathType | None" = None,
+        cwd: PathType | None = None,
+        fluent_path: PathType | None = None,
         topy: str | list | None = None,
         start_watchdog: bool | None = None,
         file_transfer_service: Any | None = None,
diff --git a/src/ansys/fluent/core/meshing/meshing_workflow.py b/src/ansys/fluent/core/meshing/meshing_workflow.py
index 1ac53d825343..f57e0eaf87ad 100644
--- a/src/ansys/fluent/core/meshing/meshing_workflow.py
+++ b/src/ansys/fluent/core/meshing/meshing_workflow.py
@@ -23,8 +23,6 @@
 """Meshing workflow specialization of the Workflow module that wraps and extends the
 core functionality."""
 
-from __future__ import annotations
-
 from enum import Enum
 import os
 
diff --git a/src/ansys/fluent/core/meshing/meshing_workflow_new.py b/src/ansys/fluent/core/meshing/meshing_workflow_new.py
index db2ff719fb8d..82897faac835 100644
--- a/src/ansys/fluent/core/meshing/meshing_workflow_new.py
+++ b/src/ansys/fluent/core/meshing/meshing_workflow_new.py
@@ -23,8 +23,6 @@
 """Meshing workflow specialization of the Workflow module that wraps and extends the
 core functionality."""
 
-from __future__ import annotations
-
 from enum import Enum
 import os
 
@@ -271,7 +269,7 @@ def __init__(
         workflow: PyMenuGeneric,
         meshing: PyMenuGeneric,
         fluent_version: FluentVersion,
-        file_path: PathType = None,
+        file_path: PathType | None = None,
         initialize: bool = True,
     ) -> None:
         """Initialize a ``LoadWorkflow`` instance.
diff --git a/src/ansys/fluent/core/search.py b/src/ansys/fluent/core/search.py
index a804dfda9c70..9e8b1786f8c5 100644
--- a/src/ansys/fluent/core/search.py
+++ b/src/ansys/fluent/core/search.py
@@ -420,7 +420,7 @@ def _search_whole_word(
     search_string: str,
     match_case: bool = False,
     match_whole_word: bool = True,
-    api_tree_data: dict = None,
+    api_tree_data: dict | None = None,
     api_path: str | None = None,
 ):
     """Perform exact search for a word through the Fluent's object hierarchy.
diff --git a/src/ansys/fluent/core/services/field_data.py b/src/ansys/fluent/core/services/field_data.py
index a624864f89dc..85e4028719f5 100644
--- a/src/ansys/fluent/core/services/field_data.py
+++ b/src/ansys/fluent/core/services/field_data.py
@@ -176,7 +176,7 @@ def __init__(
         self._is_data_valid = is_data_valid
 
     def get_scalar_field_range(
-        self, field: str, node_value: bool = False, surface_ids: List[int] = None
+        self, field: str, node_value: bool = False, surface_ids: List[int] | None = None
     ) -> List[float]:
         """Get the range (minimum and maximum values) of the field.
 
@@ -200,7 +200,7 @@ def get_scalar_field_range(
         return self._get_scalar_field_range(field, node_value, surface_ids)
 
     def _get_scalar_field_range(
-        self, field: str, node_value: bool = False, surface_ids: List[int] = None
+        self, field: str, node_value: bool = False, surface_ids: List[int] | None = None
     ) -> List[float]:
         if not surface_ids:
             surface_ids = []
@@ -1105,7 +1105,7 @@ class ChunkParser:
         field : numpy array
     """
 
-    def __init__(self, callbacks_provider: object = None):
+    def __init__(self, callbacks_provider: object | None = None):
         """__init__ method of ChunkParser class."""
         self._callbacks_provider = callbacks_provider
 
diff --git a/src/ansys/fluent/core/services/scheme_eval.py b/src/ansys/fluent/core/services/scheme_eval.py
index 4428ae66e291..f6c3355828d4 100644
--- a/src/ansys/fluent/core/services/scheme_eval.py
+++ b/src/ansys/fluent/core/services/scheme_eval.py
@@ -88,7 +88,7 @@ def string_eval(
     def scheme_eval(
         self,
         request: SchemeEvalProtoModule.SchemeEvalRequest,
-        metadata: list[tuple[str, str]] = None,
+        metadata: list[tuple[str, str]] | None = None,
     ) -> SchemeEvalProtoModule.SchemeEvalResponse:
         """SchemeEval RPC of SchemeEval service."""
         new_metadata = self.__metadata
diff --git a/src/ansys/fluent/core/session.py b/src/ansys/fluent/core/session.py
index 423fa213b0c3..6d80d4a7a157 100644
--- a/src/ansys/fluent/core/session.py
+++ b/src/ansys/fluent/core/session.py
@@ -30,6 +30,7 @@
 import warnings
 import weakref
 
+from beartype import beartype
 from deprecated.sphinx import deprecated
 
 from ansys.fluent.core._types import PathType
@@ -263,6 +264,7 @@ def _build_from_fluent_connection(
             self._fluent_connection.register_finalizer_cb(obj.stop)
 
     @deprecate_function(version="v0.38.0", new_func="is_active")
+    @beartype
     def is_server_healthy(self) -> bool:
         """Whether the current session is healthy (i.e. the server is 'SERVING')."""
         return self._is_server_healthy()
@@ -271,6 +273,7 @@ def _is_server_healthy(self) -> bool:
         """Whether the current session is healthy (i.e. the server is 'SERVING')."""
         return self._health_check.is_serving
 
+    @beartype
     def is_active(self) -> bool:
         """Whether the current session is active."""
         return self._fluent_connection is not None and self._is_server_healthy()
@@ -308,6 +311,7 @@ def field_data_streaming(self):
         return self.fields.field_data_streaming
 
     @property
+    @beartype
     def id(self) -> str:
         """Return the session ID."""
         return self._fluent_connection._id
@@ -379,10 +383,12 @@ def _create_from_server_info_file(
         )
         return session
 
+    @beartype
     def execute_tui(self, command: str) -> None:
         """Executes a tui command."""
         self.scheme.eval(f"(ti-menu-load-string {json.dumps(command)})")
 
+    @beartype
     def get_fluent_version(self) -> FluentVersion:
         """Gets and returns the fluent version."""
         return FluentVersion(self.scheme.version)
@@ -415,6 +421,7 @@ def wait_process_finished(self, wait: float | int | bool = 60):
         """
         return self._fluent_connection_backup.wait_process_finished()
 
+    @beartype
     def exit(self, **kwargs) -> None:
         """Exit session.
 
@@ -431,11 +438,13 @@ def _exit(self, **kwargs) -> None:
             self._fluent_connection.exit(**kwargs)
             self._fluent_connection = None
 
+    @beartype
     def force_exit(self) -> None:
         """Forces the Fluent session to exit, losing unsaved progress and data."""
         self._exit_compose_service()
         self._fluent_connection.force_exit()
 
+    @beartype
     def file_exists_on_remote(self, file_name: str) -> bool:
         """Check if remote file exists.
 
@@ -493,6 +502,7 @@ def download(self, file_name: str, local_directory: str | None = None):
             )
             return self._file_transfer_service.download(file_name, local_directory)
 
+    @beartype
     def chdir(self, path: PathType) -> None:
         """Change Fluent working directory.
 
diff --git a/src/ansys/fluent/core/session_base_meshing.py b/src/ansys/fluent/core/session_base_meshing.py
index 7a93cd3b5f4f..1b0799eb1e76 100644
--- a/src/ansys/fluent/core/session_base_meshing.py
+++ b/src/ansys/fluent/core/session_base_meshing.py
@@ -333,7 +333,7 @@ def topology_based_meshing_workflow(
 
     def load_workflow(
         self,
-        file_path: PathType = None,
+        file_path: PathType | None = None,
         initialize: bool = True,
         legacy: bool | None = None,
     ):
diff --git a/src/ansys/fluent/core/session_utilities.py b/src/ansys/fluent/core/session_utilities.py
index fff2926411f3..57fea5f56151 100644
--- a/src/ansys/fluent/core/session_utilities.py
+++ b/src/ansys/fluent/core/session_utilities.py
@@ -62,7 +62,7 @@ def from_install(
         cls,
         ui_mode: UIMode | str | None = None,
         graphics_driver: (
-            FluentWindowsGraphicsDriver | FluentLinuxGraphicsDriver | str
+            FluentWindowsGraphicsDriver | FluentLinuxGraphicsDriver | str | None
         ) = None,
         product_version: FluentVersion | str | float | int | None = None,
         dimension: Dimension | int | None = None,
@@ -75,13 +75,13 @@ def from_install(
         cleanup_on_exit: bool = True,
         dry_run: bool = False,
         start_transcript: bool = True,
-        case_file_name: "PathType | None" = None,
-        case_data_file_name: "PathType | None" = None,
+        case_file_name: PathType | None = None,
+        case_data_file_name: PathType | None = None,
         lightweight_mode: bool | None = None,
         py: bool | None = None,
         gpu: bool | None = None,
-        cwd: "PathType | None" = None,
-        fluent_path: "PathType | None" = None,
+        cwd: PathType | None = None,
+        fluent_path: PathType | None = None,
         topy: str | list | None = None,
         start_watchdog: bool | None = None,
         file_transfer_service: Any | None = None,
diff --git a/src/ansys/fluent/core/solver/flobject.py b/src/ansys/fluent/core/solver/flobject.py
index 5fb82cf9c500..4c79cc540919 100644
--- a/src/ansys/fluent/core/solver/flobject.py
+++ b/src/ansys/fluent/core/solver/flobject.py
@@ -38,8 +38,6 @@
 >>> r.boundary_conditions.velocity_inlet['inlet'].vmag.constant = 20
 """
 
-from __future__ import annotations
-
 import collections
 from contextlib import contextmanager, nullcontext, suppress
 import fnmatch
@@ -67,6 +65,7 @@
     _eval_type,
     get_args,
     get_origin,
+    no_type_check,
 )
 import warnings
 import weakref
@@ -276,6 +275,9 @@ def _is_deprecated(obj) -> bool | None:
     )
 
 
+# no_type_check: __setattr__ unconditionally raises AttributeError, preventing
+# beartype from writing wrapper attributes on instances or subclasses.
+@no_type_check
 class Base:
     """Provides the base class for settings and command objects.
 
@@ -797,6 +799,9 @@ def _create_child(cls, name, parent: weakref.CallableProxyType, alias_path=None)
     return cls(name, parent)
 
 
+# no_type_check: generic proxy base; instances communicate with a live gRPC
+# service; attribute writes intercepted by Base.__setattr__.
+@no_type_check
 class SettingsBase(Base, Generic[StateT]):
     """Base class for settings objects.
 
@@ -1055,6 +1060,9 @@ def _get_type_for_completer_info(cls) -> str:
         return cls.__bases__[0].__name__
 
 
+# no_type_check: defines __setattr__ and __getattribute__ proxying to gRPC;
+# beartype inspection would trigger unintended network calls.
+@no_type_check
 class Group(SettingsBase[DictStateType]):
     """A ``Group`` container object.
 
@@ -1236,6 +1244,8 @@ def __setattr__(self, name: str, value):
                 raise
 
 
+# no_type_check: defines __getattr__ proxying wildcard paths to gRPC.
+@no_type_check
 class WildcardPath(Group):
     """Class wrapping a wildcard path to perform get_var and set_var on flproxy."""
 
@@ -1332,6 +1342,9 @@ def __setitem__(self, name, value):
 ChildTypeT = TypeVar("ChildTypeT")
 
 
+# no_type_check: defines __getattr__ proxying to gRPC; subclasses generated
+# dynamically by get_cls() factory and are not statically analysable.
+@no_type_check
 class NamedObject(SettingsBase[DictStateType], Generic[ChildTypeT]):
     """A ``NamedObject`` container is a container object similar to a Python dictionary
     object. Generally, many such objects can be created with different names.
@@ -1595,6 +1608,9 @@ def _rename(obj: NamedObject | _Alias, new: str, old: str):
     obj._create_child_object(new)
 
 
+# no_type_check: defines __getattr__ proxying to gRPC; subclasses generated
+# dynamically by get_cls() factory.
+@no_type_check
 class ListObject(SettingsBase[ListStateType], Generic[ChildTypeT]):
     """A ``ListObject`` container is a container object, similar to a Python list
     object. Generally, many such objects can be created.
@@ -1739,6 +1755,9 @@ def _get_new_keywords(obj, *args, **kwds):
     return newkwds
 
 
+# no_type_check: defines __getattr__; Command/Query subclasses are
+# dynamically generated by get_cls() factory.
+@no_type_check
 class Action(Base):
     """Intermediate Base class for Command and Query class."""
 
@@ -2150,6 +2169,9 @@ def __set__(self, instance, value):
 
 
 # pylint: disable=missing-raises-doc
+# no_type_check: runtime class factory using type(); produces classes
+# dynamically from Fluent metadata and is not statically analysable.
+@no_type_check
 def get_cls(name, info, parent=None, version=None, parent_taboo=None):
     """Create a class for the object identified by "path"."""
     try:
diff --git a/src/ansys/fluent/core/solver/flunits.py b/src/ansys/fluent/core/solver/flunits.py
index 2be657a15507..4a76fdfbb023 100644
--- a/src/ansys/fluent/core/solver/flunits.py
+++ b/src/ansys/fluent/core/solver/flunits.py
@@ -124,8 +124,6 @@
  'wave-length': 'Angstrom'}
 """
 
-from __future__ import annotations
-
 from typing import TypeVar
 
 _fl_unit_table = {
diff --git a/src/ansys/fluent/core/ui/standalone_web_ui.py b/src/ansys/fluent/core/ui/standalone_web_ui.py
index c3f6385b96ca..1f938081aea6 100644
--- a/src/ansys/fluent/core/ui/standalone_web_ui.py
+++ b/src/ansys/fluent/core/ui/standalone_web_ui.py
@@ -22,8 +22,6 @@
 
 """Web UI for Fluent settings using Panel with lazy loading and batched property access."""
 
-from __future__ import annotations
-
 from typing import Any, Callable, Dict, List
 
 try:
diff --git a/src/ansys/fluent/core/utils/deprecate.py b/src/ansys/fluent/core/utils/deprecate.py
index 60cde218b29c..83088f3ac5f0 100644
--- a/src/ansys/fluent/core/utils/deprecate.py
+++ b/src/ansys/fluent/core/utils/deprecate.py
@@ -135,6 +135,7 @@ def wrapper(*args, **kwargs):
                     )
             return deprecated_func(*args, **kwargs)
 
+        wrapper.__signature__ = inspect.signature(func)
         return wrapper
 
     return decorator
@@ -178,6 +179,7 @@ def wrapper(*args, **kwargs):
             warnings.warn(reason, warning_cls, stacklevel=2)
             return decorated(*args, **kwargs)
 
+        wrapper.__signature__ = inspect.signature(func)
         return wrapper
 
     return decorator
diff --git a/src/ansys/fluent/core/workflow.py b/src/ansys/fluent/core/workflow.py
index 98a5d09050f6..6070763004f9 100644
--- a/src/ansys/fluent/core/workflow.py
+++ b/src/ansys/fluent/core/workflow.py
@@ -22,8 +22,6 @@
 
 """Workflow module that wraps and extends the core functionality."""
 
-from __future__ import annotations
-
 from contextlib import suppress
 import logging
 import re
@@ -203,7 +201,7 @@ class BaseTask:
 
     def __init__(
         self,
-        command_source: Workflow,
+        command_source: "Workflow",
         task: str,
     ) -> None:
         """Initialize BaseTask.
@@ -621,7 +619,7 @@ class TaskContainer(PyCallableStateObject):
     __dir__()
     """
 
-    def __init__(self, command_source: ClassicWorkflow) -> None:
+    def __init__(self, command_source: "ClassicWorkflow") -> None:
         """Initialize TaskContainer.
 
         Parameters
@@ -969,7 +967,7 @@ class CommandTask(BaseTask):
 
     def __init__(
         self,
-        command_source: Workflow,
+        command_source: "Workflow",
         task: str,
     ) -> None:
         """Initialize CommandTask.
@@ -984,7 +982,7 @@ def __init__(
         super().__init__(command_source, task)
 
     @property
-    def command_arguments(self) -> ReadOnlyObject:
+    def command_arguments(self) -> "ReadOnlyObject":
         """Get the task's arguments in read-only form (deprecated).
 
         Returns
@@ -996,7 +994,7 @@ def command_arguments(self) -> ReadOnlyObject:
         return self._refreshed_command()
 
     @property
-    def _command_arguments(self) -> ReadOnlyObject:
+    def _command_arguments(self) -> "ReadOnlyObject":
         return self._refreshed_command()
 
     @property
@@ -1010,7 +1008,7 @@ def arguments(self) -> ArgumentsWrapper:
         """
         return ArgumentsWrapper(self)
 
-    def _refreshed_command(self) -> ReadOnlyObject:
+    def _refreshed_command(self) -> "ReadOnlyObject":
         task_arg_state = self._task.Arguments.get_state()
         cmd = self._command()
         if task_arg_state:
@@ -1038,7 +1036,7 @@ class SimpleTask(CommandTask):
 
     def __init__(
         self,
-        command_source: Workflow,
+        command_source: "Workflow",
         task: str,
     ) -> None:
         """Initialize SimpleTask.
@@ -1066,7 +1064,7 @@ class CompoundChild(SimpleTask):
 
     def __init__(
         self,
-        command_source: Workflow,
+        command_source: "Workflow",
         task: str,
     ) -> None:
         """Initialize CompoundChild.
@@ -1111,7 +1109,7 @@ class CompositeTask(BaseTask):
 
     def __init__(
         self,
-        command_source: Workflow,
+        command_source: "Workflow",
         task: str,
     ) -> None:
         """Initialize CompositeTask.
@@ -1126,7 +1124,7 @@ def __init__(
         super().__init__(command_source, task)
 
     @property
-    def command_arguments(self) -> ReadOnlyObject:
+    def command_arguments(self) -> "ReadOnlyObject":
         """Get the task's arguments in read-only form (deprecated).
 
         Returns
@@ -1138,7 +1136,7 @@ def command_arguments(self) -> ReadOnlyObject:
         return {}
 
     @property
-    def _command_arguments(self) -> ReadOnlyObject:
+    def _command_arguments(self) -> "ReadOnlyObject":
         return {}
 
     @property
@@ -1163,7 +1161,7 @@ class ConditionalTask(CommandTask):
 
     def __init__(
         self,
-        command_source: Workflow,
+        command_source: "Workflow",
         task: str,
     ) -> None:
         """Initialize ConditionalTask.
@@ -1198,7 +1196,7 @@ class CompoundTask(CommandTask):
 
     def __init__(
         self,
-        command_source: Workflow,
+        command_source: "Workflow",
         task: str,
     ) -> None:
         """Initialize CompoundTask.
diff --git a/src/ansys/fluent/core/workflow_new.py b/src/ansys/fluent/core/workflow_new.py
index cb7edce33a03..ff8556ad33cf 100644
--- a/src/ansys/fluent/core/workflow_new.py
+++ b/src/ansys/fluent/core/workflow_new.py
@@ -43,8 +43,6 @@
 simulation workflows, with automatic dependency management and validation.
 """
 
-from __future__ import annotations
-
 from collections import OrderedDict
 from functools import wraps
 import inspect
@@ -360,7 +358,7 @@ def task_names(self):
         """
         return [name.split(":")[0] for name in self._workflow.task_object()]
 
-    def children(self) -> list[TaskObject]:
+    def children(self) -> "list[TaskObject]":
         """Get the top-level tasks in the workflow in display order.
 
         Returns an ordered list of the workflow's main tasks (those directly under
@@ -396,7 +394,7 @@ def children(self) -> list[TaskObject]:
 
         return wrapped_tasks
 
-    def first_child(self) -> TaskObject | None:
+    def first_child(self) -> "TaskObject | None":
         """Get the first top-level task in the workflow.
 
         Returns
@@ -437,7 +435,7 @@ def first_child(self) -> TaskObject | None:
                     self._command_source,
                 )
 
-    def last_child(self) -> TaskObject | None:
+    def last_child(self) -> "TaskObject | None":
         """Get the last top-level task in the workflow.
 
         Returns
@@ -506,7 +504,7 @@ def _ordered_tasks(self):
 
         return sorted_dict
 
-    def delete_tasks(self, list_of_tasks: list[TaskObject]):
+    def delete_tasks(self, list_of_tasks: "list[TaskObject]"):
         """Delete multiple tasks from the workflow.
 
         Removes the specified tasks from the workflow. Tasks are identified by TaskObject instances.
@@ -537,7 +535,7 @@ def delete_tasks(self, list_of_tasks: list[TaskObject]):
         self._workflow.general.delete_tasks(list_of_tasks=items_to_be_deleted)
 
     @property
-    def insertable_tasks(self) -> FirstTask:
+    def insertable_tasks(self) -> "FirstTask":
         """Tasks that can be inserted into an empty workflow.
 
         Returns a helper that exposes the set of valid starting tasks for a blank
@@ -688,7 +686,7 @@ def __init__(
         task_object: PyMenu,
         base_name: str,
         workflow: PyMenu,
-        parent: Workflow | TaskObject,
+        parent: "Workflow | TaskObject",
         meshing_root: PyMenu,
     ):
         """Initialize a TaskObject wrapper.
@@ -812,7 +810,7 @@ def __init__(self, base_task):
                 setattr(self, item, insertable_task)
                 self._insertable_tasks.append(insertable_task)
 
-        def __call__(self) -> list[_Insert]:
+        def __call__(self) -> "list[_Insert]":
             """Get list of all insertable task objects.
 
             Returns
diff --git a/tests/test_deprecate.py b/tests/test_deprecate.py
index 6c5c2b7ba783..39aee2396c6d 100644
--- a/tests/test_deprecate.py
+++ b/tests/test_deprecate.py
@@ -20,6 +20,7 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
+import inspect
 import warnings
 
 import pytest
@@ -155,3 +156,33 @@ def new_add(a, b):
     assert "3.0.0" in str(warning.message)
 
     assert result == 3
+
+
+def test_deprecate_arguments_preserves_signature():
+    """Test that @deprecate_arguments preserves the original function signature."""
+
+    @deprecate_arguments(old_args="old_x", new_args="x", version="3.0.0")
+    def my_func(x: int, y: str = "hello") -> bool:
+        return True
+
+    sig = inspect.signature(my_func)
+    param_names = list(sig.parameters.keys())
+    assert param_names == ["x", "y"]
+    assert sig.parameters["x"].annotation is int
+    assert sig.parameters["y"].default == "hello"
+    assert sig.return_annotation is bool
+
+
+def test_deprecate_function_preserves_signature():
+    """Test that @deprecate_function preserves the original function signature."""
+
+    @deprecate_function(version="3.0.0", new_func="new_fn")
+    def old_fn(a: int, b: str = "world") -> float:
+        return 1.0
+
+    sig = inspect.signature(old_fn)
+    param_names = list(sig.parameters.keys())
+    assert param_names == ["a", "b"]
+    assert sig.parameters["a"].annotation is int
+    assert sig.parameters["b"].default == "world"
+    assert sig.return_annotation is float