feat: Merge latest changes (#7)

* Rename package and clean up dependencies

Change-Id: I33496d84c3b40cfbafa395211b4396da709f0b3c

* Create a new ADK agent that can use another agent via A2A

This also handles updates to the request handler to return from
message/send early when a Task reaches an "interruptable" state, which
right now is just `auth-required`. Events from the agent are still
processed in the background.

Change-Id: I5b0848721342bfdba0f4f34909abbf790c0350df

---------

Co-authored-by: Mike Smith <[email protected]>

Author: kthota-g

examples/google_adk/birthday_planner/README.md

@@ -0,0 +1,27 @@
+# ADK Agent with A2A Client
+
+This example shows how to create an A2A Server that uses an ADK-based Agent that communicates with another agent using A2A.
+
+This agent helps plan birthday parties. It has access to a Calendar Agent that it can delegate calendar-related tasks to. This agent is accessed via A2A.
+
+## Prerequisites
+
+- Python 3.9 or higher
+- [UV](https://docs.astral.sh/uv/)
+- A Gemini API Key
+
+## Running the example
+
+1. Create the .env file with your API Key
+
+```bash
+echo "GOOGLE_API_KEY=your_api_key_here" > .env
+```
+
+2. Run the Calendar Agent. See examples/google_adk/calendar_agent.
+
+3. Run the example
+
+```
+uv run .
+```

examples/google_adk/birthday_planner/__main__.py

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+import asyncio
+import functools
+import logging
+import os
+
+import click
+import uvicorn
+from adk_agent_executor import ADKAgentExecutor
+from dotenv import load_dotenv
+
+from a2a.server.apps import A2AStarletteApplication
+from a2a.server.request_handlers import DefaultRequestHandler
+from a2a.server.tasks import InMemoryTaskStore
+from a2a.types import (
+    AgentAuthentication,
+    AgentCapabilities,
+    AgentCard,
+    AgentSkill,
+)
+
+load_dotenv()
+
+logging.basicConfig()
+
+
+def make_sync(func):
+    @functools.wraps(func)
+    def wrapper(*args, **kwargs):
+        return asyncio.run(func(*args, **kwargs))
+
+    return wrapper
+
+
+@click.command()
+@click.option('--host', 'host', default='localhost')
+@click.option('--port', 'port', default=10008)
+@click.option(
+    '--calendar-agent', 'calendar_agent', default='http://localhost:10007'
+)
+def main(host: str, port: int, calendar_agent: str):
+    # Verify an API key is set. Not required if using Vertex AI APIs, since those can use gcloud credentials.
+    if not os.getenv('GOOGLE_GENAI_USE_VERTEXAI') == 'TRUE':
+        if not os.getenv('GOOGLE_API_KEY'):
+            raise Exception(
+                'GOOGLE_API_KEY environment variable not set and GOOGLE_GENAI_USE_VERTEXAI is not TRUE.'
+            )
+
+    skill = AgentSkill(
+        id='plan_parties',
+        name='Plan a Birthday Party',
+        description='Plan a birthday party, including times, activities, and themes.',
+        tags=['event-planning'],
+        examples=[
+            'My son is turning 3 on August 2nd! What should I do for his party?',
+            'Can you add the details to my calendar?',
+        ],
+    )
+
+    agent_executor = ADKAgentExecutor(calendar_agent)
+    agent_card = AgentCard(
+        name='Birthday Planner',
+        description='I can help you plan fun birthday parties.',
+        url=f'http://{host}:{port}/',
+        version='1.0.0',
+        defaultInputModes=['text'],
+        defaultOutputModes=['text'],
+        capabilities=AgentCapabilities(streaming=True),
+        skills=[skill],
+        authentication=AgentAuthentication(schemes=['public']),
+    )
+    request_handler = DefaultRequestHandler(
+        agent_executor=agent_executor, task_store=InMemoryTaskStore()
+    )
+    app = A2AStarletteApplication(agent_card, request_handler)
+    uvicorn.run(app.build(), host=host, port=port)
+
+
+if __name__ == '__main__':
+    main()