Merge branch 'migration' of github.com:sokoliva/a2a-python into migration

Author: msampathkumar

README.md

@@ -68,7 +68,6 @@ Install the core SDK and any desired extras using your preferred package manager
 | **gRPC Support**         | `uv add "a2a-sdk[grpc]"`                   | `pip install "a2a-sdk[grpc]"`                |
 | **OpenTelemetry Tracing**| `uv add "a2a-sdk[telemetry]"`              | `pip install "a2a-sdk[telemetry]"`           |
 | **Encryption**           | `uv add "a2a-sdk[encryption]"`             | `pip install "a2a-sdk[encryption]"`          |
-| **Vertex AI Task Store** | `uv add "a2a-sdk[vertex]"`                 | `pip install "a2a-sdk[vertex]"`              |
 |                          |                                            |                                              |
 | **Database Drivers**     |                                            |                                              |
 | **PostgreSQL**           | `uv add "a2a-sdk[postgresql]"`             | `pip install "a2a-sdk[postgresql]"`          |

docs/migrations/v1_0/README.md

@@ -287,20 +287,21 @@ create_rest_routes(request_handler, enable_v0_3_compat=True)
 
 ## 6. Client: Creating a Client
 
-The `A2AClient` class has been removed. Use the new `create_client()` factory function.
+New `create_client()` `ClientFactory` function that creates a client for the agent.
 
-### Simple usage: `create_client()`
+> **Note**: The legacy `A2AClient` class has been removed.
 
 **Before (v0.3):**
 ```python
-import httpx
-from a2a.client import A2AClient, A2ACardResolver
-
-async with httpx.AsyncClient() as httpx_client:
-    resolver = A2ACardResolver(httpx_client, base_url)
-    agent_card = await resolver.get_agent_card()
-    client = A2AClient(httpx_client, agent_card=agent_card)
-    # use client...
+from a2a.client import ClientFactory
+
+# From URL
+factory = ClientFactory()
+client = factory.create_client('http://localhost:9999/')
+
+# From an already-resolved AgentCard
+factory = ClientFactory()
+client = factory.create_client(agent_card)
 ```
 
 **After (v1.0):**
@@ -309,13 +310,9 @@ from a2a.client import create_client
 
 # From URL — resolves the agent card automatically
 client = await create_client('http://localhost:9999/')
-async with client:
-    # use client...
 
 # From an already-resolved AgentCard
 client = await create_client(agent_card)
-async with client:
-    # use client...
 ```
 
 
@@ -325,20 +322,24 @@ async with client:
 
 ## 7. Client: Send Message
 
-The key change in `BaseClient` is the return type of `send_message()`: it **now returns `AsyncIterator[StreamResponse]`** (v0.3 returned `AsyncIterator[ClientEvent | Message]`). 
+The `BaseClient.send_message()` return type is standardised from `AsyncIterator[ClientEvent | Message]` to  `AsyncIterator[StreamResponse]`.
 
-```python
-from a2a.types import Message, Part, Role, SendMessageRequest
-from uuid import uuid4
+Each `StreamResponse` yields exactly one of: `task`, `message`, `status_update`, or `artifact_update`. Use `HasField()` to check which field is set.
 
-request = SendMessageRequest(
-    message=Message(
-        role=Role.ROLE_USER,
-        parts=[Part(text=user_input)],
-        message_id=uuid4().hex,
-    )
-)
 
+**Before (v0.3):**
+```python
+async for event, message in client.send_message(request):
+    if isinstance(event, Task):
+        ...
+    if isinstance(event, UpdateEvent):
+        ...
+    if message:
+        ...
+```
+
+**After (v1.0):**
+```python
 async for chunk in client.send_message(request):
     if chunk.HasField('artifact_update'):
         ...
@@ -350,9 +351,6 @@ async for chunk in client.send_message(request):
         ...
 ```
 
-Each `StreamResponse` yields exactly one of: `task`, `message`, `status_update`, or `artifact_update`. Use `HasField()` to check which field is set.
-
-> **Note**: The legacy `A2AClient` class has been removed. Use `create_client()` as shown in [section 5](#5-client-creating-a-client). **Example**: [`helloworld/test_client.py` in PR #474](https://github.com/a2aproject/a2a-samples/pull/474/files#diff-f62c07d3b00364a3100b7effb3e2a1cca0624277d3e40da1bdb07bb46b6a8cef)
 
 ---
 

pyproject.toml

@@ -43,7 +43,6 @@ mysql = ["sqlalchemy[asyncio,aiomysql]>=2.0.0"]
 signing = ["PyJWT>=2.0.0"]
 sqlite = ["sqlalchemy[asyncio,aiosqlite]>=2.0.0"]
 db-cli = ["alembic>=1.14.0"]
-vertex = ["google-cloud-aiplatform>=1.140.0"]
 
 sql = ["a2a-sdk[postgresql,mysql,sqlite]"]
 
@@ -55,7 +54,6 @@ all = [
   "a2a-sdk[telemetry]",
   "a2a-sdk[signing]",
   "a2a-sdk[db-cli]",
-  "a2a-sdk[vertex]",
 ]
 
 [project.urls]