Add experimental notice to canvas (#6349)

python/packages/autogen-ext/src/autogen_ext/memory/canvas/_canvas.py

@@ -7,6 +7,11 @@ class BaseCanvas(ABC):
     An abstract protocol for "canvas" objects that maintain
     revision history for file-like data. Concrete subclasses
     can handle text, images, structured data, etc.
+
+    .. warning::
+
+        This is an experimental API and may change in the future.
+
     """
 
     @abstractmethod

python/packages/autogen-ext/src/autogen_ext/memory/canvas/_text_canvas.py

@@ -22,6 +22,10 @@ class FileRevision:
 class TextCanvas(BaseCanvas):
     """An in‑memory canvas that stores *text* files with full revision history.
 
+    .. warning::
+
+        This is an experimental API and may change in the future.
+
     Besides the original CRUD‑like operations, this enhanced implementation adds:
 
     * **apply_patch** – applies patches using the ``unidiff`` library for accurate

python/packages/autogen-ext/src/autogen_ext/memory/canvas/_text_canvas_memory.py

@@ -20,6 +20,10 @@ class TextCanvasMemory(Memory):
     A memory implementation that uses a Canvas for storing file-like content.
     Inserts the current state of the canvas into the ChatCompletionContext on each turn.
 
+    .. warning::
+
+        This is an experimental API and may change in the future.
+
     The TextCanvasMemory provides a persistent, file-like storage mechanism that can be used
     by agents to read and write content. It automatically injects the current state of all files
     in the canvas into the model context before each inference.