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You’ll build a real-time voice agent you can talk to in your browser, using Gemini Realtime on Stream’s edge network. About 18 lines of Python.

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Build your agent

Set up your project

Create a project directory and install Vision Agents with the getstream and gemini plugins. If you don’t have uv yet, install it first.
uv init --python 3.12 my-agent && cd my-agent
uv add "vision-agents[getstream,gemini]" python-dotenv

Add your API keys

Get the keys you’ll need:Then create a .env file in the project root. Vision Agents auto-loads these for each plugin.
.env
STREAM_API_KEY=your_stream_api_key
STREAM_API_SECRET=your_stream_api_secret
GOOGLE_API_KEY=your_google_api_key

Write the agent

Create main.py. The agent joins a Stream call and responds via Gemini Realtime.
main.py
from dotenv import load_dotenv

from vision_agents.core import Agent, AgentLauncher, User, Runner
from vision_agents.plugins import getstream, gemini

load_dotenv()


async def create_agent(**kwargs) -> Agent:
    return Agent(
        edge=getstream.Edge(),
        agent_user=User(name="Assistant", id="agent"),
        instructions="You're a helpful voice assistant. Be concise.",
        llm=gemini.Realtime(),
    )


async def join_call(agent: Agent, call_type: str, call_id: str, **kwargs) -> None:
    call = await agent.create_call(call_type, call_id)
    async with agent.join(call):
        await agent.simple_response("Greet the user")
        await agent.finish()


if __name__ == "__main__":
    Runner(AgentLauncher(create_agent=create_agent, join_call=join_call)).cli()

Run it

Start the agent. The CLI prints a join link, open it to talk to your agent in the browser.
uv run main.py run
The agent greets you as soon as you join the call.

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