Pydantic AI

Pydantic AI emits GenAI spans of its own. Point a standard exporter at Agent Pulse and turn them on. Python.

Turn tracing on

pip install pydantic-ai opentelemetry-sdk opentelemetry-exporter-otlp-proto-http

Set the exporter variables from OpenTelemetry, then once at startup:

from opentelemetry import trace
from opentelemetry.sdk.trace import TracerProvider
from opentelemetry.sdk.trace.export import BatchSpanProcessor
from opentelemetry.exporter.otlp.proto.http.trace_exporter import OTLPSpanExporter
from pydantic_ai import Agent

provider = TracerProvider()
provider.add_span_processor(BatchSpanProcessor(OTLPSpanExporter()))
trace.set_tracer_provider(provider)

Agent.instrument_all()

What is recorded

• Each model call, with its model, provider and tokens, cached tokens included.
• Each tool call.
• A model call that fails, as failed.
• The agent's own span carries the run's totals and is not counted again.

Checked with Pydantic AI 2.56.

Budgets

Spans arrive after the call, so spend counts against your budgets and raises alerts, but a budget cannot stop a call recorded this way.