diff --git a/crates/fluxqueue-worker/scripts/get_registry.py b/crates/fluxqueue-worker/scripts/get_registry.py
index 51c7b3c..3db855d 100644
--- a/crates/fluxqueue-worker/scripts/get_registry.py
+++ b/crates/fluxqueue-worker/scripts/get_registry.py
@@ -19,8 +19,14 @@ def get_registry(  # noqa: C901
     registry = {"tasks": {}, "contexts": {}}
     for _name, obj in inspect.getmembers(module):
         if inspect.isfunction(obj):
+            is_fluxqueue_task = getattr(obj, "fluxqueue", False)
+
+            if not is_fluxqueue_task:
+                continue
+
             task_name = getattr(obj, "task_name", None)
             task_queue = getattr(obj, "queue", None)
+
             if not task_queue or task_queue != queue:
                 continue
 
diff --git a/python/fluxqueue/_task.py b/python/fluxqueue/_task.py
index 7f9d9b0..ee95898 100644
--- a/python/fluxqueue/_task.py
+++ b/python/fluxqueue/_task.py
@@ -1,11 +1,15 @@
+from __future__ import annotations
+
 import inspect
 from collections.abc import Callable, Coroutine
 from functools import wraps
-from typing import Any, ParamSpec, cast, get_type_hints, overload
+from typing import TYPE_CHECKING, Any, ParamSpec, cast, get_type_hints, overload
 
-from ._core import FluxQueueCore
 from .utils import get_task_name
 
+if TYPE_CHECKING:
+    from ._core import FluxQueueCore
+
 P = ParamSpec("P")
 
 
@@ -47,7 +51,7 @@ def _task_decorator(
 
     task_name = get_task_name(func, name)
 
-    # TODO: Add unique identifier 'fluxqueue' just to be 100% sure
+    cast(Any, func).fluxqueue = True
     cast(Any, func).task_name = task_name
     cast(Any, func).queue = queue
 
diff --git a/python/fluxqueue/context.py b/python/fluxqueue/context.py
index d8686e6..fc605a9 100644
--- a/python/fluxqueue/context.py
+++ b/python/fluxqueue/context.py
@@ -1,12 +1,25 @@
+from __future__ import annotations
+
 import inspect
 import threading
 from collections.abc import Callable, Coroutine
 from contextvars import ContextVar
-from typing import Any, Concatenate, ParamSpec, TypeVar, cast, get_type_hints, overload
+from typing import (
+    TYPE_CHECKING,
+    Any,
+    Concatenate,
+    ParamSpec,
+    TypeVar,
+    cast,
+    get_type_hints,
+    overload,
+)
 
-from ._core import FluxQueueCore
 from ._task import _task_decorator
-from .models import TaskMetadata
+
+if TYPE_CHECKING:
+    from ._core import FluxQueueCore
+    from .models import TaskMetadata
 
 P = ParamSpec("P")