from google.adk.agents import Agent
  from opik.integrations.adk import OpikTracer


  opik_tracer = OpikTracer()

  root_agent = Agent(
     name="weather_time_agent",
     model="gemini-2.0-flash-exp",
     description=DESCRIPTION,
     instruction=INSTRUCTION,
     tools=[...],
     before_agent_callback=opik_tracer.before_agent_callback,
     after_agent_callback=opik_tracer.after_agent_callback,
     before_model_callback=opik_tracer.before_model_callback,
     after_model_callback=opik_tracer.after_model_callback,
     before_tool_callback=opik_tracer.before_tool_callback,
     after_tool_callback=opik_tracer.after_tool_callback,
  )