chore: import upstream snapshot with attribution

contributing/samples/live/live_bidi_streaming_parallel_tools_agent/README.md

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+# Simple Live (Bidi-Streaming) Agent with Parallel Tools
+
+This project provides a basic example of a live, [bidirectional streaming](https://google.github.io/adk-docs/streaming/) agent that demonstrates parallel tool execution.
+
+## Getting Started
+
+Follow these steps to get the agent up and running:
+
+1. **Start the ADK Web Server**
+   Open your terminal, navigate to the root directory that contains the
+   `live_bidi_streaming_parallel_tools_agent` folder, and execute the following
+   command:
+
+   ```bash
+   adk web
+   ```
+
+1. **Access the ADK Web UI**
+   Once the server is running, open your web browser and navigate to the URL
+   provided in the terminal (it will typically be `http://localhost:8000`).
+
+1. **Select the Agent**
+   In the top-left corner of the ADK Web UI, use the dropdown menu to select
+   this agent (`live_bidi_streaming_parallel_tools_agent`).
+
+1. **Start Streaming**
+   Click on the **Audio** icon located near the chat input
+   box to begin the streaming session.
+
+1. **Interact with the Agent**
+   You can now begin talking to the agent, and it will respond in real-time.
+   Try asking it to perform multiple actions at once, for example: "Turn on the
+   lights and the TV at the same time." The agent will be able to invoke both
+   `turn_on_lights` and `turn_on_tv` tools in parallel.
+
+## Usage Notes
+
+- You only need to click the **Audio** button once to initiate the
+  stream. The current version does not support stopping and restarting the stream
+  by clicking the button again during a session.

contributing/samples/live/live_bidi_streaming_parallel_tools_agent/__init__.py

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+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from . import agent

contributing/samples/live/live_bidi_streaming_parallel_tools_agent/agent.py

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+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+from google.adk.agents.llm_agent import Agent
+
+
+def turn_on_lights():
+  """Turn on the lights."""
+  print("turn_on_lights")
+  return {"status": "OK"}
+
+
+def turn_on_tv():
+  """Turn on the tv."""
+  print("turn_on_tv")
+  return {"status": "OK"}
+
+
+root_agent = Agent(
+    # Find supported models in Vertex here: https://docs.cloud.google.com/vertex-ai/generative-ai/docs/live-api
+    model="gemini-live-2.5-flash-native-audio",  # Vertex
+    # Find supported models in Gemini API here: https://ai.google.dev/gemini-api/docs/models
+    # model='gemini-2.5-flash-native-audio-preview-12-2025',  # Gemini API
+    name="Home_helper",
+    instruction="Be polite and answer all user's questions.",
+    tools=[turn_on_lights, turn_on_tv],
+)