Create a developer folder and add samples.

PiperOrigin-RevId: 755885332

contributing/samples/quickstart/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 google.adk.agents import Agent
+
+
+def get_weather(city: str) -> dict:
+  """Retrieves the current weather report for a specified city.
+
+  Args:
+      city (str): The name of the city for which to retrieve the weather report.
+
+  Returns:
+      dict: status and result or error msg.
+  """
+  if city.lower() == "new york":
+    return {
+        "status": "success",
+        "report": (
+            "The weather in New York is sunny with a temperature of 25 degrees"
+            " Celsius (41 degrees Fahrenheit)."
+        ),
+    }
+  else:
+    return {
+        "status": "error",
+        "error_message": f"Weather information for '{city}' is not available.",
+    }
+
+
+def get_current_time(city: str) -> dict:
+  """Returns the current time in a specified city.
+
+  Args:
+      city (str): The name of the city for which to retrieve the current time.
+
+  Returns:
+      dict: status and result or error msg.
+  """
+  import datetime
+  from zoneinfo import ZoneInfo
+
+  if city.lower() == "new york":
+    tz_identifier = "America/New_York"
+  else:
+    return {
+        "status": "error",
+        "error_message": (
+            f"Sorry, I don't have timezone information for {city}."
+        ),
+    }
+
+  tz = ZoneInfo(tz_identifier)
+  now = datetime.datetime.now(tz)
+  report = (
+      f'The current time in {city} is {now.strftime("%Y-%m-%d %H:%M:%S %Z%z")}'
+  )
+  return {"status": "success", "report": report}
+
+
+root_agent = Agent(
+    name="weather_time_agent",
+    model="gemini-2.0-flash",
+    description=(
+        "Agent to answer questions about the time and weather in a city."
+    ),
+    instruction=(
+        "I can answer your questions about the time and weather in a city."
+    ),
+    tools=[get_weather, get_current_time],
+)