Python: [BREAKING] Simplify API: ChatAgent -> Agent, ChatMessage -> Message (#3747)

* [BREAKING] Rename ChatAgent -> Agent, ChatMessage -> Message, ChatClientProtocol -> SupportsChatGetResponse

Simplify the public API by removing redundant 'Chat' prefix from core types:
- ChatAgent -> Agent
- RawChatAgent -> RawAgent
- ChatMessage -> Message
- ChatClientProtocol -> SupportsChatGetResponse

Also renamed internal WorkflowMessage (was Message in _runner_context) to avoid collision.

No backward compatibility aliases - this is a clean breaking change.

* [BREAKING] Rename Agent chat_client parameter to client

* Fix rebase issues: WorkflowMessage references and broken markdown links

* Fix formatting and lint issues from code quality checks

* Fix import ordering in workflow sample files

* fixed rebase

* Fix test failures: use WorkflowMessage and A2AMessage after ChatMessage→Message rename

- Replace Message(data=..., source_id=...) with WorkflowMessage(...) in workflow tests
- Fix isinstance check in A2A agent to use A2AMessage instead of Message
- Fix import in test_workflow_observability.py (Message→WorkflowMessage)

* Fix lint, fmt, and sample errors after ChatMessage→Message rename

- Auto-fix 70+ ruff lint issues across samples (ChatMessage→Message refs)
- Fix HostedVectorStoreContent→Content.from_hosted_vector_store in file search sample
- Fix _normalize_messages→normalize_messages in custom agent sample
- Fix context.terminate→raise MiddlewareTermination in middleware samples
- Fix with_update_hook→with_transform_hook in override middleware sample
- Add TOptions_co import back to custom_chat_client sample
- Add noqa for FastAPI File() default in chatkit sample
- Fix B023 loop variable capture in weather agent sample

* fix: update Agent constructor calls from chat_client to client in declaration-only tool tests

* fix: add register_cleanup to devui lazy-loading proxy and type stub

* fixed tests and updated new pieces

* fix agui typevar

* fix merge errors

* fix merge conflicts

* fiux merge

* Remove unused links

---------

Co-authored-by: Evan Mattson <evan.mattson@microsoft.com>

python/packages/copilotstudio/agent_framework_copilotstudio/_agent.py

@@ -11,9 +11,9 @@ from agent_framework import (
     AgentResponseUpdate,
     AgentThread,
     BaseAgent,
-    ChatMessage,
     Content,
     ContextProvider,
+    Message,
     ResponseStream,
     normalize_messages,
 )
@@ -210,7 +210,7 @@ class CopilotStudioAgent(BaseAgent):
     @overload
     def run(
         self,
-        messages: str | ChatMessage | list[str] | list[ChatMessage] | None = None,
+        messages: str | Message | list[str] | list[Message] | None = None,
         *,
         stream: Literal[False] = False,
         thread: AgentThread | None = None,
@@ -220,7 +220,7 @@ class CopilotStudioAgent(BaseAgent):
     @overload
     def run(
         self,
-        messages: str | ChatMessage | list[str] | list[ChatMessage] | None = None,
+        messages: str | Message | list[str] | list[Message] | None = None,
         *,
         stream: Literal[True],
         thread: AgentThread | None = None,
@@ -229,7 +229,7 @@ class CopilotStudioAgent(BaseAgent):
 
     def run(
         self,
-        messages: str | ChatMessage | list[str] | list[ChatMessage] | None = None,
+        messages: str | Message | list[str] | list[Message] | None = None,
         *,
         stream: bool = False,
         thread: AgentThread | None = None,
@@ -259,7 +259,7 @@ class CopilotStudioAgent(BaseAgent):
 
     async def _run_impl(
         self,
-        messages: str | ChatMessage | list[str] | list[ChatMessage] | None = None,
+        messages: str | Message | list[str] | list[Message] | None = None,
         *,
         thread: AgentThread | None = None,
         **kwargs: Any,
@@ -274,7 +274,7 @@ class CopilotStudioAgent(BaseAgent):
         question = "\n".join([message.text for message in input_messages])
 
         activities = self.client.ask_question(question, thread.service_thread_id)
-        response_messages: list[ChatMessage] = []
+        response_messages: list[Message] = []
         response_id: str | None = None
 
         response_messages = [message async for message in self._process_activities(activities, streaming=False)]
@@ -284,7 +284,7 @@ class CopilotStudioAgent(BaseAgent):
 
     def _run_stream_impl(
         self,
-        messages: str | ChatMessage | list[str] | list[ChatMessage] | None = None,
+        messages: str | Message | list[str] | list[Message] | None = None,
         *,
         thread: AgentThread | None = None,
         **kwargs: Any,
@@ -338,7 +338,7 @@ class CopilotStudioAgent(BaseAgent):
 
         return conversation_id
 
-    async def _process_activities(self, activities: AsyncIterable[Any], streaming: bool) -> AsyncIterable[ChatMessage]:
+    async def _process_activities(self, activities: AsyncIterable[Any], streaming: bool) -> AsyncIterable[Message]:
         """Process activities from the Copilot Studio agent.
 
         Args:
@@ -347,13 +347,13 @@ class CopilotStudioAgent(BaseAgent):
                 or non-streaming (message activities) responses.
 
         Yields:
-            ChatMessage objects created from the activities.
+            Message objects created from the activities.
         """
         async for activity in activities:
             if activity.text and (
                 (activity.type == "message" and not streaming) or (activity.type == "typing" and streaming)
             ):
-                yield ChatMessage(
+                yield Message(
                     role="assistant",
                     contents=[Content.from_text(activity.text)],
                     author_name=activity.from_property.name if activity.from_property else None,

python/packages/copilotstudio/tests/test_copilot_agent.py

@@ -4,7 +4,7 @@ from typing import Any
 from unittest.mock import MagicMock, patch
 
 import pytest
-from agent_framework import AgentResponse, AgentResponseUpdate, AgentThread, ChatMessage, Content
+from agent_framework import AgentResponse, AgentResponseUpdate, AgentThread, Content, Message
 from agent_framework.exceptions import ServiceException, ServiceInitializationError
 from microsoft_agents.copilotstudio.client import CopilotClient
 
@@ -134,7 +134,7 @@ class TestCopilotStudioAgent:
         assert response.messages[0].role == "assistant"
 
     async def test_run_with_chat_message(self, mock_copilot_client: MagicMock, mock_activity: MagicMock) -> None:
-        """Test run method with ChatMessage."""
+        """Test run method with Message."""
         agent = CopilotStudioAgent(client=mock_copilot_client)
 
         conversation_activity = MagicMock()
@@ -143,7 +143,7 @@ class TestCopilotStudioAgent:
         mock_copilot_client.start_conversation.return_value = create_async_generator([conversation_activity])
         mock_copilot_client.ask_question.return_value = create_async_generator([mock_activity])
 
-        chat_message = ChatMessage(role="user", contents=[Content.from_text("test message")])
+        chat_message = Message(role="user", contents=[Content.from_text("test message")])
         response = await agent.run(chat_message)
 
         assert isinstance(response, AgentResponse)