LangSmith

Send Agno traces to a LangSmith project with OpenInference and OpenTelemetry.

Send Agno agent traces to LangSmith through its OpenTelemetry endpoint.

Prerequisites

  1. Create a LangSmith Account

    • Sign up for an account at LangSmith.
    • Obtain your API key from the LangSmith dashboard.

  2. Set Environment Variables

    export LANGSMITH_API_KEY="your-key"
export LANGSMITH_ENDPOINT=https://eu.api.smith.langchain.com  # or https://api.smith.langchain.com for US
export LANGSMITH_PROJECT="your-project-name"
export OPENAI_API_KEY="your-openai-key"

  3. Install Dependencies

    uv pip install -U agno openai openinference-instrumentation-agno opentelemetry-sdk opentelemetry-exporter-otlp

Sending Traces to LangSmith

import os

from agno.agent import Agent
from agno.models.openai import OpenAIResponses
from agno.tools.hackernews import HackerNewsTools
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

langsmith_endpoint = os.environ["LANGSMITH_ENDPOINT"].rstrip("/")
endpoint = f"{langsmith_endpoint}/otel/v1/traces"
headers = {
    "x-api-key": os.environ["LANGSMITH_API_KEY"],
    "Langsmith-Project": os.environ["LANGSMITH_PROJECT"],
}

tracer_provider = TracerProvider()
tracer_provider.add_span_processor(
    SimpleSpanProcessor(OTLPSpanExporter(endpoint=endpoint, headers=headers))
)
trace_api.set_tracer_provider(tracer_provider=tracer_provider)

AgnoInstrumentor().instrument()

agent = Agent(
    name="Stock Market Agent",
    model=OpenAIResponses(id="gpt-5.2"),
    tools=[HackerNewsTools()],
    markdown=True,
    debug_mode=True,
)

agent.print_response("What is news on the stock market?")

Run the Example

Save the code as langsmith_tracing.py, then run:

python langsmith_tracing.py

Data Region

Set LANGSMITH_ENDPOINT to the endpoint for your LangSmith data region. The code appends /otel/v1/traces to that value.