Build an agent in code

!pip install google-genai google-adk

import os, getpass
os.environ['GOOGLE_API_KEY'] = getpass.getpass('Paste your Gemini key: ').strip()
os.environ['GOOGLE_GENAI_USE_VERTEXAI'] = 'FALSE'   # use the free AI Studio API

from google.adk.runners import InMemoryRunner
from google.genai import types
MODEL = 'gemini-2.0-flash'

async def run_agent(agent, prompt, user='student'):
    runner = InMemoryRunner(agent=agent, app_name='lab')
    session = await runner.session_service.create_session(app_name='lab', user_id=user)
    msg = types.Content(role='user', parts=[types.Part(text=prompt)])
    final = ''
    async for event in runner.run_async(user_id=user, session_id=session.id, new_message=msg):
        if event.is_final_response() and event.content:
            final = event.content.parts[0].text or final
    return final

import requests
from google.adk.agents import Agent

def convert_currency(amount: float, base: str, target: str) -> dict:
    """Convert money using live rates. base/target like 'USD','EUR'."""
    url = f'https://api.frankfurter.app/latest?amount={amount}&from={base}&to={target}'
    data = requests.get(url, timeout=10).json()
    return {'result': data['rates'].get(target.upper())}

api_agent = Agent(name='money', model=MODEL, tools=[convert_currency],
    instruction='For any conversion you MUST call convert_currency — never guess.')

print(await run_agent(api_agent, 'How much is 50 US dollars in euros?'))

from mcp.server.fastmcp import FastMCP
mcp = FastMCP('team')
ROLES = {'maya': 'Team Lead', 'leo': 'Data Analyst', 'ada': 'Designer'}

@mcp.tool()
def get_member_role(name: str) -> str:
    """Look up a team member's role by first name."""
    return ROLES.get(name.lower(), 'Unknown')

if __name__ == '__main__':
    mcp.run(transport='stdio')

from google.adk.tools.mcp_tool.mcp_toolset import MCPToolset
from google.adk.tools.mcp_tool.mcp_session_manager import StdioConnectionParams
from mcp import StdioServerParameters

team_tools = MCPToolset(connection_params=StdioConnectionParams(
    server_params=StdioServerParameters(command='python3', args=['team_server.py'])))

mcp_agent = Agent(name='team', model=MODEL, tools=[team_tools],
    instruction='Use the MCP tools as your only source of team info.')

print(await run_agent(mcp_agent, "What is Maya's role?"))

assistant = Agent(name='assistant', model=MODEL,
    tools=[convert_currency, team_tools],
    instruction='Use MCP tools for team info and convert_currency for money. Use tools, never guess.')

print(await run_agent(assistant,
    "Maya earned a 500 USD bonus. What's her role, and how much is 500 USD in euros?"))