Langfuse Via Openinference (With Structured Output)

import base64
import os
from enum import Enum

from agno.agent import Agent
from agno.models.openai import OpenAIChat
from agno.tools.duckduckgo import DuckDuckGoTools
from openinference.instrumentation.agno import AgnoInstrumentor
from opentelemetry import trace as trace_api
from opentelemetry.exporter.otlp.proto.http.trace_exporter import OTLPSpanExporter
from opentelemetry.sdk.trace import TracerProvider
from opentelemetry.sdk.trace.export import SimpleSpanProcessor
from pydantic import BaseModel, Field

LANGFUSE_AUTH = base64.b64encode(
    f"{os.getenv('LANGFUSE_PUBLIC_KEY')}:{os.getenv('LANGFUSE_SECRET_KEY')}".encode()
).decode()
os.environ["OTEL_EXPORTER_OTLP_ENDPOINT"] = (
    "https://us.cloud.langfuse.com/api/public/otel"  # 🇺🇸 US data region
)
# os.environ["OTEL_EXPORTER_OTLP_ENDPOINT"]="https://cloud.langfuse.com/api/public/otel" # 🇪🇺 EU data region
# os.environ["OTEL_EXPORTER_OTLP_ENDPOINT"]="http://localhost:3000/api/public/otel" # 🏠 Local deployment (>= v3.22.0)

os.environ["OTEL_EXPORTER_OTLP_HEADERS"] = f"Authorization=Basic {LANGFUSE_AUTH}"


tracer_provider = TracerProvider()
tracer_provider.add_span_processor(SimpleSpanProcessor(OTLPSpanExporter()))
trace_api.set_tracer_provider(tracer_provider=tracer_provider)

# Start instrumenting agno
AgnoInstrumentor().instrument()


class ContentType(Enum):
    NEWS = "news"
    ARTICLE = "article"
    BLOG = "blog"
    RESEARCH = "research"
    OTHER = "other"


class WebSearchResult(BaseModel):
    title: str = Field(description="The title of the search result")
    url: str = Field(description="The URL of the search result")
    snippet: str = Field(description="A brief description or snippet from the result")
    content_type: ContentType = Field(description="The type of content found")
    relevance_score: int = Field(description="Relevance score from 1-10", ge=1, le=10)


agent = Agent(
    name="Web Research Agent",
    model=OpenAIChat(id="gpt-5-mini"),
    tools=[DuckDuckGoTools()],
    instructions="You are a web research agent. Use DuckDuckGo to search the web and find relevant information. Analyze the search results and provide structured information about what you find.",
    debug_mode=True,
    output_schema=WebSearchResult,
)

agent.print_response("What are the latest developments in artificial intelligence?")