chore: import upstream snapshot with attribution

contributing/samples/multi_agent/sub_agents/agent.py

@@ -0,0 +1,64 @@
+# 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 __future__ import annotations
+
+from google.adk.agents import Agent
+from google.adk.tools.function_tool import FunctionTool
+
+
+def get_account_status(account_id: str) -> str:
+  """Gets the status of a bank account.
+
+  Args:
+      account_id: The account ID to check.
+
+  Returns:
+      The status of the account.
+  """
+  return f"Account {account_id} is active."
+
+
+def close_account(account_id: str) -> str:
+  """Closes a bank account. This action requires user confirmation.
+
+  Args:
+      account_id: The account ID to close.
+
+  Returns:
+      A confirmation message.
+  """
+  return f"Account {account_id} has been closed."
+
+
+info_agent = Agent(
+    name="info_agent",
+    description="An agent that can check account status.",
+    tools=[get_account_status],
+)
+
+close_agent = Agent(
+    name="close_agent",
+    description="An agent that can close accounts.",
+    tools=[FunctionTool(func=close_account, require_confirmation=True)],
+)
+
+root_agent = Agent(
+    name="sub_agents",
+    description=(
+        "A root agent that can check accounts and close them by delegating to"
+        " sub-agents."
+    ),
+    sub_agents=[info_agent, close_agent],
+)