diff --git a/disnake/ext/commands/core.py b/disnake/ext/commands/core.py
index 2d7ff5497e..669dd60e04 100644
--- a/disnake/ext/commands/core.py
+++ b/disnake/ext/commands/core.py
@@ -27,7 +27,12 @@
 )
 
 import disnake
-from disnake.utils import _generated, _overload_with_permissions
+from disnake.utils import (
+    _generated,
+    _overload_with_permissions,
+    get_signature_parameters,
+    unwrap_function,
+)
 
 from ._types import _BaseCommand
 from .cog import Cog
@@ -114,42 +119,6 @@
     P = TypeVar("P")
 
 
-def unwrap_function(function: Callable[..., Any]) -> Callable[..., Any]:
-    partial = functools.partial
-    while True:
-        if hasattr(function, "__wrapped__"):
-            function = function.__wrapped__
-        elif isinstance(function, partial):
-            function = function.func
-        else:
-            return function
-
-
-def get_signature_parameters(
-    function: Callable[..., Any], globalns: Dict[str, Any]
-) -> Dict[str, inspect.Parameter]:
-    signature = inspect.signature(function)
-    params = {}
-    cache: Dict[str, Any] = {}
-    eval_annotation = disnake.utils.evaluate_annotation
-    for name, parameter in signature.parameters.items():
-        annotation = parameter.annotation
-        if annotation is parameter.empty:
-            params[name] = parameter
-            continue
-        if annotation is None:
-            params[name] = parameter.replace(annotation=type(None))
-            continue
-
-        annotation = eval_annotation(annotation, globalns, globalns, cache)
-        if annotation is Greedy:
-            raise TypeError("Unparameterized Greedy[...] is disallowed in signature.")
-
-        params[name] = parameter.replace(annotation=annotation)
-
-    return params
-
-
 def wrap_callback(coro):
     @functools.wraps(coro)
     async def wrapped(*args, **kwargs):
@@ -410,7 +379,11 @@ def callback(self, function: CommandCallback[CogT, Any, P, T]) -> None:
         except AttributeError:
             globalns = {}
 
-        self.params = get_signature_parameters(function, globalns)
+        params = get_signature_parameters(function, globalns)
+        for param in params.values():
+            if param.annotation is Greedy:
+                raise TypeError("Unparameterized Greedy[...] is disallowed in signature.")
+        self.params = params
 
     def add_check(self, func: Check) -> None:
         """Adds a check to the command.
diff --git a/disnake/utils.py b/disnake/utils.py
index 15b2f53ee0..cd10aa7748 100644
--- a/disnake/utils.py
+++ b/disnake/utils.py
@@ -6,6 +6,7 @@
 import asyncio
 import datetime
 import functools
+import inspect
 import json
 import os
 import pkgutil
@@ -1200,6 +1201,38 @@ def resolve_annotation(
     return evaluate_annotation(annotation, globalns, locals, cache)
 
 
+def unwrap_function(function: Callable[..., Any]) -> Callable[..., Any]:
+    partial = functools.partial
+    while True:
+        if hasattr(function, "__wrapped__"):
+            function = function.__wrapped__
+        elif isinstance(function, partial):
+            function = function.func
+        else:
+            return function
+
+
+def get_signature_parameters(
+    function: Callable[..., Any], globalns: Dict[str, Any]
+) -> Dict[str, inspect.Parameter]:
+    signature = inspect.signature(function)
+    params = {}
+    cache: Dict[str, Any] = {}
+    for name, parameter in signature.parameters.items():
+        annotation = parameter.annotation
+        if annotation is parameter.empty:
+            params[name] = parameter
+            continue
+        if annotation is None:
+            params[name] = parameter.replace(annotation=type(None))
+            continue
+
+        annotation = evaluate_annotation(annotation, globalns, globalns, cache)
+        params[name] = parameter.replace(annotation=annotation)
+
+    return params
+
+
 TimestampStyle = Literal["f", "F", "d", "D", "t", "T", "R"]