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This guide shows you how to integrate the google-genai SDK into your Cycls agent to access Gemini models. You will learn how to:
  • Define dependencies for the Docker environment.
  • Configure the Gemini API client inside the agent handler.
  • Stream responses from Gemini back to the user.

​
Prerequisites

  • Python 3.9+
  • cycls package installed
  • Google AI Studio API Key
  • Docker installed (for local testing)
pip install cycls

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Step 1: Create the Agent

Create a new file called app.py: 
import cycls

@cycls.app(pip=["google-genai"], copy=[".env"])
async def app(context):
    import os
    from google import genai

    # Convert messages to Gemini format
    contents = [
        {
            'role': 'model' if m['role'] == 'assistant' else 'user',
            'parts': [{'text': m['content']}]
        }
        for m in context.messages if m['role'] != 'system'
    ]

    # Initialize Gemini client
    client = genai.Client(api_key=os.getenv("GEMINI_API_KEY"))

    # Stream the response
    async for chunk in await client.aio.models.generate_content_stream(
        model="gemini-2.5-flash",
        contents=contents,
        config={'system_instruction': "You are a helpful AI assistant."}
    ):
        if chunk.text:
            yield chunk.text

app.local()

​
Step 2: Configure Environment

Create a .env file in the same directory with your API key: 
GEMINI_API_KEY=your_api_key_here

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Step 3: Run the Agent

Execute your agent script: 
python app.py
The agent will start locally and provide an endpoint for interaction.

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Full Code

Here is the complete app.py file: 
import cycls

@cycls.app(pip=["google-genai"], copy=[".env"])
async def app(context):
    import os
    from google import genai

    # Convert messages to Gemini format
    contents = [
        {
            'role': 'model' if m['role'] == 'assistant' else 'user',
            'parts': [{'text': m['content']}]
        }
        for m in context.messages if m['role'] != 'system'
    ]

    # Initialize Gemini client
    client = genai.Client(api_key=os.getenv("GEMINI_API_KEY"))

    # Stream the response
    async for chunk in await client.aio.models.generate_content_stream(
        model="gemini-2.5-flash",
        contents=contents,
        config={'system_instruction': "You are a helpful AI assistant."}
    ):
        if chunk.text:
            yield chunk.text

app.local()

​
Deploy to Cloud

To deploy to production: 
import cycls
import os

cycls.api_key = os.getenv("CYCLS_API_KEY")

@cycls.app(pip=["google-genai"], copy=[".env"])
async def app(context):
    from google import genai

    contents = [
        {
            'role': 'model' if m['role'] == 'assistant' else 'user',
            'parts': [{'text': m['content']}]
        }
        for m in context.messages if m['role'] != 'system'
    ]

    client = genai.Client(api_key=os.getenv("GEMINI_API_KEY"))

    async for chunk in await client.aio.models.generate_content_stream(
        model="gemini-2.5-flash",
        contents=contents,
        config={'system_instruction': "You are a helpful AI assistant."}
    ):
        if chunk.text:
            yield chunk.text

app.deploy()