Python: [BREAKING] Types API Review improvements (#3647)

* Replace Role and FinishReason classes with NewType + Literal

- Remove EnumLike metaclass from _types.py
- Replace Role class with NewType('Role', str) + RoleLiteral
- Replace FinishReason class with NewType('FinishReason', str) + FinishReasonLiteral
- Update all usages across codebase to use string literals
- Remove .value access patterns (direct string comparison now works)
- Add backward compatibility for legacy dict serialization format
- Update tests to reflect new string-based types

Addresses #3591, #3615

* Simplify ChatResponse and AgentResponse type hints (#3592)

- Remove overloads from ChatResponse.__init__
- Remove text parameter from ChatResponse.__init__
- Remove | dict[str, Any] from finish_reason and usage_details params
- Remove **kwargs from AgentResponse.__init__
- Both now accept ChatMessage | Sequence[ChatMessage] | None for messages
- Update docstrings and examples to reflect changes
- Fix tests that were using removed kwargs
- Fix Role type hint usage in ag-ui utils

* Remove text parameter from ChatResponseUpdate and AgentResponseUpdate (#3597)

- Remove text parameter from ChatResponseUpdate.__init__
- Remove text parameter from AgentResponseUpdate.__init__
- Remove **kwargs from both update classes
- Simplify contents parameter type to Sequence[Content] | None
- Update all usages to use contents=[Content.from_text(...)] pattern
- Fix imports in test files
- Update docstrings and examples

* Rename from_chat_response_updates to from_updates (#3593)

- ChatResponse.from_chat_response_updates → ChatResponse.from_updates
- ChatResponse.from_chat_response_generator → ChatResponse.from_update_generator
- AgentResponse.from_agent_run_response_updates → AgentResponse.from_updates

* Remove try_parse_value method from ChatResponse and AgentResponse (#3595)

- Remove try_parse_value method from ChatResponse
- Remove try_parse_value method from AgentResponse
- Remove try_parse_value calls from from_updates and from_update_generator methods
- Update samples to use try/except with response.value instead
- Update tests to use response.value pattern
- Users should now use response.value with try/except for safe parsing

* Add agent_id to AgentResponse and clarify author_name documentation (#3596)

- Add agent_id parameter to AgentResponse class
- Document that author_name is on ChatMessage objects, not responses
- Update ChatResponse docstring with author_name note
- Update AgentResponse docstring with author_name note

* Simplify ChatMessage.__init__ signature (#3618)

- Make contents a positional argument accepting Sequence[Content | str]
- Auto-convert strings in contents to TextContent
- Remove overloads, keep text kwarg for backward compatibility with serialization
- Update _parse_content_list to handle string items
- Update all usages across codebase to use new format: ChatMessage("role", ["text"])

* Allow Content as input on run and get_response

- Update prepare_messages and normalize_messages to accept Content
- Update type signatures in _agents.py and _clients.py
- Add tests for Content input handling

* Fix ChatMessage usage across packages and samples

Update all remaining ChatMessage(role=..., text=...) to use new
ChatMessage('role', ['text']) signature.

* Fix Role string usage and response format parsing

- Fix redis provider: remove .value access on string literals
- Fix durabletask ensure_response_format: set _response_format before accessing .value

* Fix ollama .value and ai_model_id issues, handle None in content list

- Fix ollama _chat_client: remove .value on string literals
- Fix ollama _chat_client: rename ai_model_id to model_id
- Fix _parse_content_list: skip None values gracefully

* Fix A2AAgent type signature to include Content

* Fix Role/FinishReason NewType dict annotations and improve test coverage to 95%

* Fix mypy errors for Role/FinishReason NewType usage

* Fix Role.TOOL and Role.ASSISTANT usage in _orchestrator_helpers.py

* Fix Role NewType usage in durabletask _models.py

python/packages/redis/agent_framework_redis/_chat_message_store.py

@@ -225,7 +225,7 @@ class RedisChatMessageStore:
         Example:
             .. code-block:: python
 
-                messages = [ChatMessage(role="user", text="Hello"), ChatMessage(role="assistant", text="Hi there!")]
+                messages = [ChatMessage("user", ["Hello"]), ChatMessage("assistant", ["Hi there!"])]
                 await store.add_messages(messages)
         """
         if not messages:

python/packages/redis/agent_framework_redis/_provider.py

@@ -8,7 +8,7 @@ from operator import and_
 from typing import Any, Literal, cast
 
 import numpy as np
-from agent_framework import ChatMessage, Context, ContextProvider, Role
+from agent_framework import ChatMessage, Context, ContextProvider
 from agent_framework.exceptions import (
     AgentException,
     ServiceInitializationError,
@@ -503,13 +503,9 @@ class RedisProvider(ContextProvider):
 
         messages: list[dict[str, Any]] = []
         for message in messages_list:
-            if (
-                message.role.value in {Role.USER.value, Role.ASSISTANT.value, Role.SYSTEM.value}
-                and message.text
-                and message.text.strip()
-            ):
+            if message.role in {"user", "assistant", "system"} and message.text and message.text.strip():
                 shaped: dict[str, Any] = {
-                    "role": message.role.value,
+                    "role": message.role,
                     "content": message.text,
                     "conversation_id": self._conversation_id,
                     "message_id": message.message_id,
@@ -545,7 +541,7 @@ class RedisProvider(ContextProvider):
         )
 
         return Context(
-            messages=[ChatMessage(role="user", text=f"{self.context_prompt}\n{line_separated_memories}")]
+            messages=[ChatMessage("user", [f"{self.context_prompt}\n{line_separated_memories}"])]
             if line_separated_memories
             else None
         )