GoogleのAgent Development Kit（ADK）のQuick Startをやってみた！

uv init

uv add google-adk
uv sync

mkdir -p src/multi_tool_agent

from . import agent

import datetime
from zoneinfo import ZoneInfo
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.
    """

    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-exp",
    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],
)

# If using Gemini via Google AI Studio
GOOGLE_GENAI_USE_VERTEXAI="False"
GOOGLE_API_KEY="paste-your-actual-key-here"

# # If using Gemini via Vertex AI on Google CLoud
# GOOGLE_CLOUD_PROJECT="your-project-id"
# GOOGLE_CLOUD_LOCATION="your-location" #e.g. us-central1
# GOOGLE_GENAI_USE_VERTEXAI="True"

.
├── main.py
├── pyproject.toml
├── README.md
├── src # <-- ここ
│   └── multi_tool_agent
│       ├── __init__.py
│       ├── .env
│       └── agent.py
└── uv.lock

$ uv run adk web
INFO:     Started server process [32629]
INFO:     Waiting for application startup.
+-----------------------------------------------------------------------------+
| ADK Web Server started                                                      |
|                                                                             |
| For local testing, access at http://localhost:8000.                         |
+-----------------------------------------------------------------------------+

INFO:     Application startup complete.
INFO:     Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)