diff --git a/mellea/stdlib/funcs.py b/mellea/stdlib/functional.py
similarity index 100%
rename from mellea/stdlib/funcs.py
rename to mellea/stdlib/functional.py
diff --git a/mellea/stdlib/sampling/base.py b/mellea/stdlib/sampling/base.py
index 6520a7da..43608733 100644
--- a/mellea/stdlib/sampling/base.py
+++ b/mellea/stdlib/sampling/base.py
@@ -5,9 +5,9 @@
 
 import tqdm
 
+import mellea.stdlib.functional as mfuncs
 from mellea.backends import Backend, BaseModelSubclass
 from mellea.helpers.fancy_logger import FancyLogger
-from mellea.stdlib import funcs as mfuncs
 from mellea.stdlib.base import CBlock, ChatContext, Component, Context, ModelOutputThunk
 from mellea.stdlib.chat import Message
 from mellea.stdlib.instruction import Instruction
diff --git a/mellea/stdlib/sampling/best_of_n.py b/mellea/stdlib/sampling/best_of_n.py
index 59c402b2..1f11d157 100644
--- a/mellea/stdlib/sampling/best_of_n.py
+++ b/mellea/stdlib/sampling/best_of_n.py
@@ -4,10 +4,10 @@
 
 import tqdm
 
+import mellea.stdlib.functional as mfuncs
 from mellea.backends import Backend, BaseModelSubclass
 from mellea.helpers.async_helpers import wait_for_all_mots
 from mellea.helpers.fancy_logger import FancyLogger
-from mellea.stdlib import funcs as mfuncs
 from mellea.stdlib.base import CBlock, ChatContext, Component, Context, ModelOutputThunk
 from mellea.stdlib.instruction import Instruction
 from mellea.stdlib.requirement import Requirement, ScorerRequirement, ValidationResult
diff --git a/mellea/stdlib/session.py b/mellea/stdlib/session.py
index 2a63a71a..91d1be24 100644
--- a/mellea/stdlib/session.py
+++ b/mellea/stdlib/session.py
@@ -3,12 +3,13 @@
 from __future__ import annotations
 
 import contextvars
+import inspect
 from copy import copy
 from typing import Any, Literal, overload
 
 from PIL import Image as PILImage
 
-import mellea.stdlib.funcs as mfuncs
+import mellea.stdlib.functional as mfuncs
 from mellea.backends import Backend, BaseModelSubclass
 from mellea.backends.model_ids import (
     IBM_GRANITE_3_3_8B,
@@ -804,6 +805,12 @@ async def atransform(
         self.ctx = context
         return result
 
+    @classmethod
+    def powerup(cls, powerup_cls: type):
+        """Appends methods in a class object `powerup_cls` to MelleaSession."""
+        for name, fn in inspect.getmembers(powerup_cls, predicate=inspect.isfunction):
+            setattr(cls, name, fn)
+
     # ###############################
     #  Convenience functions
     # ###############################
diff --git a/test/stdlib_basics/test_funcs.py b/test/stdlib_basics/test_functional.py
similarity index 96%
rename from test/stdlib_basics/test_funcs.py
rename to test/stdlib_basics/test_functional.py
index e41b1dbf..4dbfb9e0 100644
--- a/test/stdlib_basics/test_funcs.py
+++ b/test/stdlib_basics/test_functional.py
@@ -3,7 +3,7 @@
 from mellea.backends.types import ModelOption
 from mellea.stdlib.base import ModelOutputThunk
 from mellea.stdlib.chat import Message
-from mellea.stdlib.funcs import instruct, aact, avalidate, ainstruct
+from mellea.stdlib.functional import instruct, aact, avalidate, ainstruct
 from mellea.stdlib.requirement import req
 from mellea.stdlib.session import start_session
 
diff --git a/test/stdlib_basics/test_session.py b/test/stdlib_basics/test_session.py
index 808e843b..a1722e83 100644
--- a/test/stdlib_basics/test_session.py
+++ b/test/stdlib_basics/test_session.py
@@ -7,7 +7,7 @@
 from mellea.backends.types import ModelOption
 from mellea.stdlib.base import ChatContext, ModelOutputThunk
 from mellea.stdlib.chat import Message
-from mellea.stdlib.session import start_session
+from mellea.stdlib.session import start_session, MelleaSession
 
 
 # We edit the context type in the async tests below. Don't change the scope here.
@@ -134,5 +134,17 @@ def test_session_copy_with_context_ops(m_session):
     assert m2.ctx.previous_node.previous_node is m_session.ctx
 
 
+class TestPowerup:
+    def hello(m:MelleaSession):
+        return "hello"
+
+
+def test_powerup(m_session):
+
+    MelleaSession.powerup(TestPowerup)
+
+    assert "hello" == m_session.hello()
+
+
 if __name__ == "__main__":
     pytest.main([__file__])