Create a developer folder and add samples.

PiperOrigin-RevId: 755885332

contributing/samples/human_in_loop/__init__.py

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+# Copyright 2025 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/human_in_loop/agent.py

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+# Copyright 2025 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 typing import Any
+
+from google.adk import Agent
+from google.adk.tools import ToolContext
+from google.adk.tools.long_running_tool import LongRunningFunctionTool
+from google.genai import types
+
+
+def reimburse(purpose: str, amount: float) -> str:
+  """Reimburse the amount of money to the employee."""
+  return {'status': 'ok'}
+
+
+def ask_for_approval(
+    purpose: str, amount: float, tool_context: ToolContext
+) -> dict[str, Any]:
+  """Ask for approval for the reimbursement."""
+  return {'status': 'pending'}
+
+
+root_agent = Agent(
+    model='gemini-1.5-flash',
+    name='reimbursement_agent',
+    instruction="""
+      You are an agent whose job is to handle the reimbursement process for
+      the employees. If the amount is less than $100, you will automatically
+      approve the reimbursement.
+
+      If the amount is greater than $100, you will
+      ask for approval from the manager. If the manager approves, you will
+      call reimburse() to reimburse the amount to the employee. If the manager
+      rejects, you will inform the employee of the rejection.
+""",
+    tools=[reimburse, LongRunningFunctionTool(func=ask_for_approval)],
+    generate_content_config=types.GenerateContentConfig(temperature=0.1),
+)