Migrating from Langfuse to TraceCraft

pip install tracecraft
# or
uv add tracecraft

from langfuse.decorators import observe, langfuse_context
 
@observe()
def my_agent(query: str) -> str:
    langfuse_context.update_current_observation(
        metadata={"user_id": "123"}
    )
    return process(query)

import tracecraft
 
@tracecraft.trace_agent(name="my_agent")
def my_agent(query: str) -> str:
    # Metadata captured automatically from function args
    return process(query)

from langfuse import Langfuse
 
langfuse = Langfuse()
 
trace = langfuse.trace(name="my-trace")
span = trace.span(name="llm-call")
span.end(output=result)
trace.update(output=final_result)

from tracecraft.core.context import run_context
from tracecraft.core.models import AgentRun, Step, StepType
from datetime import UTC, datetime
 
run = AgentRun(name="my-trace", start_time=datetime.now(UTC))
 
with run_context(run):
    step = Step(
        trace_id=run.id,
        type=StepType.LLM,
        name="llm-call",
        start_time=datetime.now(UTC)
    )
    # ... do work ...
    step.outputs = {"result": result}
    step.end_time = datetime.now(UTC)
    run.steps.append(step)
 
run.output = {"final": final_result}

from langfuse.callback import CallbackHandler
 
handler = CallbackHandler()
chain.invoke(input, config={"callbacks": [handler]})

from tracecraft.adapters.langchain import TraceCraftCallbackHandler
 
handler = TraceCraftCallbackHandler()
chain.invoke(input, config={"callbacks": [handler]})

os.environ["LANGFUSE_PUBLIC_KEY"] = "pk-..."
os.environ["LANGFUSE_SECRET_KEY"] = "sk-..."
os.environ["LANGFUSE_HOST"] = "https://cloud.langfuse.com"

import tracecraft
from tracecraft.exporters.otlp import OTLPExporter
 
# For local development
tracecraft.init(console=True, jsonl=True)
 
# For production (Jaeger, Honeycomb, etc.)
tracecraft.init(exporters=[
    OTLPExporter(endpoint="http://collector:4317")
])