> ## Documentation Index
> Fetch the complete documentation index at: https://phidatainc.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Langfuse Via OpenLIT

> Export traces from a web-search agent to Langfuse by wiring an OTLP HTTP span exporter into OpenLIT's global tracer with batching disabled.

Demonstrates sending Agno traces to Langfuse through OpenLIT.

```python langfuse_via_openlit.py theme={null}
"""
Langfuse Via OpenLIT
====================

Demonstrates sending Agno traces to Langfuse through OpenLIT.
"""

import base64
import os

from agno.agent import Agent
from agno.models.openai import OpenAIChat
from agno.tools.websearch import WebSearchTools

# ---------------------------------------------------------------------------
# Setup
# ---------------------------------------------------------------------------
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}"

from opentelemetry.exporter.otlp.proto.http.trace_exporter import (  # noqa: E402
    OTLPSpanExporter,
)
from opentelemetry.sdk.trace import TracerProvider  # noqa: E402
from opentelemetry.sdk.trace.export import SimpleSpanProcessor  # noqa: E402

trace_provider = TracerProvider()
trace_provider.add_span_processor(SimpleSpanProcessor(OTLPSpanExporter()))

# Sets the global default tracer provider
from opentelemetry import trace  # noqa: E402

trace.set_tracer_provider(trace_provider)

# Creates a tracer from the global tracer provider
tracer = trace.get_tracer(__name__)

import openlit  # noqa: E402

# Initialize OpenLIT instrumentation. The disable_batch flag is set to true to process traces immediately.
openlit.init(tracer=tracer, disable_batch=True)


# ---------------------------------------------------------------------------
# Create Agent
# ---------------------------------------------------------------------------
agent = Agent(
    model=OpenAIChat(id="gpt-4o-mini"),
    tools=[WebSearchTools()],
    markdown=True,
    debug_mode=True,
)


# ---------------------------------------------------------------------------
# Run Example
# ---------------------------------------------------------------------------
if __name__ == "__main__":
    agent.print_response("What is currently trending on Twitter?")
```

## Run the Example

<Steps>
  <Snippet file="create-venv-step.mdx" />

  <Step title="Install dependencies">
    ```bash theme={null}
    uv pip install -U agno ddgs openai openlit opentelemetry-exporter-otlp opentelemetry-sdk
    ```
  </Step>

  <Step title="Export environment variables">
    <CodeGroup>
      ```bash Mac/Linux theme={null}
      export LANGFUSE_PUBLIC_KEY="your_langfuse_public_key_here"
      export LANGFUSE_SECRET_KEY="your_langfuse_secret_key_here"
      export OPENAI_API_KEY="your_openai_api_key_here"
      ```

      ```bash Windows theme={null}
      $Env:LANGFUSE_PUBLIC_KEY="your_langfuse_public_key_here"
      $Env:LANGFUSE_SECRET_KEY="your_langfuse_secret_key_here"
      $Env:OPENAI_API_KEY="your_openai_api_key_here"
      ```
    </CodeGroup>
  </Step>

  <Step title="Run the example">
    Save the code above as `langfuse_via_openlit.py`, then run:

    ```bash theme={null}
    python langfuse_via_openlit.py
    ```
  </Step>
</Steps>

Full source: [cookbook/observability/langfuse\_via\_openlit.py](https://github.com/agno-agi/agno/blob/main/cookbook/observability/langfuse_via_openlit.py)