"""
Serve a Google ADK Agent through A2A JSON-RPC
=============================================
Google ADK exposes one Agent as a standard A2A JSON-RPC application. The
custom Agent card advertises streaming and the root RPC URL used by Agno's
RemoteAgent.
Prerequisites: GOOGLE_API_KEY, `google-adk`, and `a2a-sdk[http-server]`
Run: use the isolated Google ADK command in `20_remote/README.md`
Try: fetch GET http://127.0.0.1:8001/.well-known/agent-card.json
"""
from a2a.types import AgentCapabilities, AgentCard
from google.adk import Agent
from google.adk.a2a.utils.agent_to_a2a import to_a2a
PORT = 8001
# ---------------------------------------------------------------------------
# Create Agent
# ---------------------------------------------------------------------------
facts_agent = Agent(
name="facts_agent",
model="gemini-3.5-flash",
description="A Google ADK Agent that explains durable scientific facts.",
instruction=(
"Answer with one accurate scientific fact. Keep the answer to two sentences."
),
)
# ---------------------------------------------------------------------------
# Create A2A Application
# ---------------------------------------------------------------------------
agent_card = AgentCard(
name="facts_agent",
description="A Google ADK Agent that explains durable scientific facts.",
url=f"http://127.0.0.1:{PORT}",
version="1.0.0",
capabilities=AgentCapabilities(
streaming=True,
push_notifications=False,
state_transition_history=False,
),
skills=[],
default_input_modes=["text/plain"],
default_output_modes=["text/plain"],
)
app = to_a2a(
facts_agent,
host="127.0.0.1",
port=PORT,
agent_card=agent_card,
)
# ---------------------------------------------------------------------------
# Run A2A Server
# ---------------------------------------------------------------------------
if __name__ == "__main__":
import uvicorn
uvicorn.run(app, host="127.0.0.1", port=PORT)
