diff --git a/python/packages/anthropic/AGENTS.md b/python/packages/anthropic/AGENTS.md
index 748f9a26f0..ce70e9d9a0 100644
--- a/python/packages/anthropic/AGENTS.md
+++ b/python/packages/anthropic/AGENTS.md
@@ -5,6 +5,9 @@ Integration with Anthropic's Claude API.
 ## Main Classes
 
 - **`AnthropicClient`** - Chat client for Anthropic Claude models
+- **`AnthropicFoundryClient`** - Anthropic chat client for Azure AI Foundry's Anthropic-compatible endpoint
+- **`AnthropicBedrockClient`** - Anthropic chat client for Amazon Bedrock
+- **`AnthropicVertexClient`** - Anthropic chat client for Google Vertex AI
 - **`AnthropicChatOptions`** - Options TypedDict for Anthropic-specific parameters
 
 ## Usage
@@ -12,7 +15,7 @@ Integration with Anthropic's Claude API.
 ```python
 from agent_framework.anthropic import AnthropicClient
 
-client = AnthropicClient(model_id="claude-sonnet-4-20250514")
+client = AnthropicClient(model="claude-sonnet-4-20250514")
 response = await client.get_response("Hello")
 ```
 
diff --git a/python/packages/core/AGENTS.md b/python/packages/core/AGENTS.md
index 859858f0ef..d6940289ac 100644
--- a/python/packages/core/AGENTS.md
+++ b/python/packages/core/AGENTS.md
@@ -61,8 +61,8 @@ agent_framework/
 
 - **`AgentSession`** - Manages conversation state and session metadata
 - **`SessionContext`** - Context object for session-scoped data during agent runs
-- **`BaseContextProvider`** - Base class for context providers (RAG, memory systems)
-- **`BaseHistoryProvider`** - Base class for conversation history storage
+- **`ContextProvider`** - Base class for context providers (RAG, memory systems)
+- **`HistoryProvider`** - Base class for conversation history storage
 
 ### Skills (`_skills.py`)
 
@@ -70,7 +70,7 @@ agent_framework/
 - **`SkillResource`** - Named supplementary content attached to a skill; holds either static `content` or a dynamic `function` (sync or async). Exactly one must be provided.
 - **`SkillScript`** - An executable script attached to a skill; holds either an inline `function` (code-defined, runs in-process) or a `path` to a file on disk (file-based, delegated to a runner). Exactly one must be provided.
 - **`SkillScriptRunner`** - Protocol for file-based script execution. Any callable matching `(skill, script, args) -> Any` satisfies it. Code-defined scripts do not use a runner.
-- **`SkillsProvider`** - Context provider (extends `BaseContextProvider`) that discovers file-based skills from `SKILL.md` files and/or accepts code-defined `Skill` instances. Follows progressive disclosure: advertise → load → read resources / run scripts.
+- **`SkillsProvider`** - Context provider (extends `ContextProvider`) that discovers file-based skills from `SKILL.md` files and/or accepts code-defined `Skill` instances. Follows progressive disclosure: advertise → load → read resources / run scripts.
 
 ### Workflows (`_workflows/`)
 
@@ -82,13 +82,12 @@ agent_framework/
 
 ### OpenAI (`openai/`)
 
-- **`OpenAIChatClient`** - Chat client for OpenAI API
-- **`OpenAIResponsesClient`** - Client for OpenAI Responses API
+- **`OpenAIChatClient`** - Chat client for the OpenAI Responses API
+- **`OpenAIChatCompletionClient`** - Chat client for the OpenAI Chat Completions API
 
-### Azure OpenAI (`azure/`)
+### Foundry (`foundry/`)
 
-- **`AzureOpenAIChatClient`** - Chat client for Azure OpenAI
-- **`AzureOpenAIResponsesClient`** - Client for Azure OpenAI Responses API
+- **`FoundryChatClient`** - Chat client for Azure AI Foundry project endpoints
 
 ## Key Patterns
 
@@ -137,7 +136,7 @@ from agent_framework import BaseChatClient, ChatResponse, Message
 class MyClient(BaseChatClient):
     async def _inner_get_response(self, *, messages, options, **kwargs) -> ChatResponse:
         # Call your LLM here
-        return ChatResponse(messages=[Message(role="assistant", text="Hi!")])
+        return ChatResponse(messages=[Message(role="assistant", contents=["Hi!"])])
 
     async def _inner_get_streaming_response(self, *, messages, options, **kwargs):
         yield ChatResponseUpdate(...)
diff --git a/python/packages/core/agent_framework/_types.py b/python/packages/core/agent_framework/_types.py
index a4e3a57330..22f0720ed4 100644
--- a/python/packages/core/agent_framework/_types.py
+++ b/python/packages/core/agent_framework/_types.py
@@ -1866,6 +1866,9 @@ def _process_update(response: ChatResponse | AgentResponse, update: ChatResponse
             response.finish_reason = update.finish_reason
         if update.model_id is not None:
             response.model_id = update.model_id
+    if isinstance(response, AgentResponse) and isinstance(update, AgentResponseUpdate):
+        if update.finish_reason is not None:
+            response.finish_reason = update.finish_reason
     response.continuation_token = update.continuation_token
 
 
@@ -2369,6 +2372,7 @@ def __init__(
         response_id: str | None = None,
         agent_id: str | None = None,
         created_at: CreatedAtT | None = None,
+        finish_reason: FinishReasonLiteral | FinishReason | None = None,
         usage_details: UsageDetails | None = None,
         value: ResponseModelT | None = None,
         response_format: type[BaseModel] | None = None,
@@ -2384,6 +2388,7 @@ def __init__(
             agent_id: The identifier of the agent that produced this response. Useful in multi-agent
                 scenarios to track which agent generated the response.
             created_at: A timestamp for the chat response.
+            finish_reason: Optional reason the agent finished (e.g., "stop", "length", "tool_calls").
             usage_details: The usage details for the chat response.
             value: The structured output of the agent run response, if applicable.
             response_format: Optional response format for the agent response.
@@ -2410,6 +2415,7 @@ def __init__(
         self.response_id = response_id
         self.agent_id = agent_id
         self.created_at = created_at
+        self.finish_reason = finish_reason
         self.usage_details = usage_details
         self._value: ResponseModelT | None = value
         self._response_format: type[BaseModel] | None = response_format
@@ -2604,6 +2610,7 @@ def __init__(
         response_id: str | None = None,
         message_id: str | None = None,
         created_at: CreatedAtT | None = None,
+        finish_reason: FinishReasonLiteral | FinishReason | None = None,
         continuation_token: ContinuationToken | None = None,
         additional_properties: dict[str, Any] | None = None,
         raw_representation: Any | None = None,
@@ -2619,6 +2626,7 @@ def __init__(
             response_id: Optional ID of the response of which this update is a part.
             message_id: Optional ID of the message of which this update is a part.
             created_at: Optional timestamp for the chat response update.
+            finish_reason: Optional finish reason for the operation (e.g., "stop", "length", "tool_calls").
             continuation_token: Optional token for resuming a long-running background operation.
                 When present, indicates the operation is still in progress.
             additional_properties: Optional additional properties associated with the chat response update.
@@ -2645,6 +2653,7 @@ def __init__(
         self.response_id = response_id
         self.message_id = message_id
         self.created_at = created_at
+        self.finish_reason = finish_reason
         self.continuation_token = continuation_token
         self.additional_properties = _restore_compaction_annotation_in_additional_properties(
             additional_properties,
@@ -2677,6 +2686,7 @@ def map_chat_to_agent_update(update: ChatResponseUpdate, agent_name: str | None)
         response_id=update.response_id,
         message_id=update.message_id,
         created_at=update.created_at,
+        finish_reason=update.finish_reason,
         continuation_token=update.continuation_token,
         additional_properties=update.additional_properties,
         raw_representation=update,
diff --git a/python/packages/core/tests/core/test_finish_reason.py b/python/packages/core/tests/core/test_finish_reason.py
new file mode 100644
index 0000000000..1c01215f22
--- /dev/null
+++ b/python/packages/core/tests/core/test_finish_reason.py
@@ -0,0 +1,100 @@
+from agent_framework import (
+    AgentResponse,
+    AgentResponseUpdate,
+    ChatResponseUpdate,
+    Content,
+    Message,
+)
+from agent_framework._types import _process_update, map_chat_to_agent_update
+
+
+def test_agent_response_init_with_finish_reason() -> None:
+    """Test that AgentResponse correctly initializes and stores finish_reason."""
+    response = AgentResponse(
+        messages=[Message("assistant", [Content.from_text("test")])],
+        finish_reason="stop",
+    )
+    assert response.finish_reason == "stop"
+
+
+def test_agent_response_update_init_with_finish_reason() -> None:
+    """Test that AgentResponseUpdate correctly initializes and stores finish_reason."""
+    update = AgentResponseUpdate(
+        contents=[Content.from_text("test")],
+        role="assistant",
+        finish_reason="stop",
+    )
+    assert update.finish_reason == "stop"
+
+
+def test_map_chat_to_agent_update_forwards_finish_reason() -> None:
+    """Test that mapping a ChatResponseUpdate with finish_reason forwards it."""
+    chat_update = ChatResponseUpdate(
+        contents=[Content.from_text("test")],
+        finish_reason="length",
+    )
+    agent_update = map_chat_to_agent_update(chat_update, agent_name="test_agent")
+
+    assert agent_update.finish_reason == "length"
+    assert agent_update.author_name == "test_agent"
+
+
+def test_process_update_propagates_finish_reason_to_agent_response() -> None:
+    """Test that _process_update correctly updates an AgentResponse from an AgentResponseUpdate."""
+    response = AgentResponse(messages=[Message("assistant", [Content.from_text("test")])])
+    update = AgentResponseUpdate(
+        contents=[Content.from_text("more text")],
+        role="assistant",
+        finish_reason="stop",
+    )
+
+    # Process the update
+    _process_update(response, update)
+
+    assert response.finish_reason == "stop"
+
+
+def test_process_update_does_not_overwrite_with_none() -> None:
+    """Test that _process_update does not overwrite an existing finish_reason with None."""
+    response = AgentResponse(
+        messages=[Message("assistant", [Content.from_text("test")])],
+        finish_reason="length",
+    )
+    update = AgentResponseUpdate(
+        contents=[Content.from_text("more text")],
+        role="assistant",
+        finish_reason=None,
+    )
+
+    # Process the update
+    _process_update(response, update)
+
+    assert response.finish_reason == "length"
+
+
+def test_agent_response_serialization_includes_finish_reason() -> None:
+    """Test that AgentResponse serializes correctly, including finish_reason."""
+    response = AgentResponse(
+        messages=[Message("assistant", [Content.from_text("test")])],
+        response_id="test_123",
+        finish_reason="stop",
+    )
+
+    # Serialize using the framework's API and verify finish_reason is included.
+    data = response.to_dict()
+    assert "finish_reason" in data
+    assert data["finish_reason"] == "stop"
+
+
+def test_agent_response_update_serialization_includes_finish_reason() -> None:
+    """Test that AgentResponseUpdate serializes correctly, including finish_reason."""
+    update = AgentResponseUpdate(
+        contents=[Content.from_text("test")],
+        role="assistant",
+        response_id="test_456",
+        finish_reason="tool_calls",
+    )
+
+    data = update.to_dict()
+    assert "finish_reason" in data
+    assert data["finish_reason"] == "tool_calls"