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 on setting the required environment variables.
export GEMINI_API_KEY=[your_key_here]
Use the register function to connect your application to Phoenix.
from arize.otel import register
tracer_provider = register(
space_id = "your-space-id", # in app space settings page
api_key = "your-api-key", # in app space settings page
project_name = "your-project-name", # name this to whatever you would like
)
# Import the automatic instrumentor from OpenInference
from openinference.instrumentation.google-genai import GoogleGenAIInstrumentor
# Finish automatic instrumentation
GoogleGenAIInstrumentor().instrument(tracer_provider=tracer_provider)
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 for the status.
