Sub agents

An agent can have other agents underneath it. The parent decides who handles what.

python

from google.adk.agents.llm_agent import Agent

billing = Agent(
    model="gemini-flash-latest",
    name="billing",
    description="Handles invoices, refunds and payment problems.",
    instruction="You answer billing questions only.",
)

technical = Agent(
    model="gemini-flash-latest",
    name="technical",
    description="Handles bugs, errors and setup problems.",
    instruction="You answer technical questions only.",
)

root_agent = Agent(
    model="gemini-flash-latest",
    name="root_agent",
    instruction="Route the user to the right specialist.",
    sub_agents=[billing, technical],
)

Delegation runs on description

The parent chooses a sub agent by reading its description. Two vague descriptions mean work goes to the wrong one, and it will look like a model problem when it is a wording problem.

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