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Install

pip install openinference-instrumentation-google-genai google-genai

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Setup

Set the GEMINI_API_KEY environment variable. To use the Gen AI SDK with Vertex AI instead of the Developer API, refer to Google’s guide on setting the required environment variables. 
export GEMINI_API_KEY=[your_key_here]
Use the register function to connect your application to Phoenix. 
from phoenix.otel import register

# Configure the Phoenix tracer
tracer_provider = register(
  project_name="my-llm-app", # Default is 'default'
  auto_instrument=True # Auto-instrument your app based on installed OI dependencies
)

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Observe

Now that you have tracing setup, all Gen AI SDK requests will be streamed to Phoenix for observability and evaluation. 
import os
from google import genai

def send_message_multi_turn() -> tuple[str, str]:
    client = genai.Client(api_key=os.environ["GEMINI_API_KEY"])
    chat = client.chats.create(model="gemini-2.0-flash-001")
    response1 = chat.send_message("What is the capital of France?")
    response2 = chat.send_message("Why is the sky blue?")

    return response1.text or "", response2.text or ""
This instrumentation will support tool calling soon. Refer to this page for the status.