TraceAgent Pydantic AI Integration
Pydantic AI capability that streams agent runs, model requests and tool calls into TraceAgent. Requires Pydantic AI 2.x.
Install
pip install trace-agent-pydantic-ai
Usage
from pydantic_ai import Agent
from trace_agent_sdk import TraceAgentClient
client = TraceAgentClient("http://localhost:8000")
run = client.start_run("my-agent", "Do something")
agent = Agent("openai:gpt-4o", capabilities=[run.as_pydantic_ai_capability()])
result = agent.run_sync("hello")
run.finish(result.output)
The capability never breaks or slows the agent. Events are delivered by a background thread; if the backend is unreachable or hangs, a one-line warning is printed, trace delivery pauses for a while, and the agent keeps running. Events produced while paused are dropped. The end of the outermost run waits a few seconds at most for pending events, so run.finish() is delivered after them.
Pydantic AI prints a startup banner suggesting Logfire while its own observability is off. It is unrelated to TraceAgent and can be silenced with PYDANTIC_AI_NO_BANNER=1.
Without any code: OpenTelemetry
Pydantic AI already emits OpenTelemetry spans, and the TraceAgent server can receive them, so an agent can be traced
without this package at all: export its spans over OTLP to http://<server>/v1/traces. See the
server README and
examples/pydantic_ai_otel_agent.py.
Pick one route per agent. The capability above records more detail you control (redaction, node events) and works without OpenTelemetry; the OpenTelemetry route needs no change to the agent. Using both records the run twice.
Options
run.as_pydantic_ai_capability(...) accepts:
| Option | Default | Description |
|---|---|---|
record_model_events |
True |
Record each model request as an LLM call (tokens, model, requested tools) |
record_tool_events |
True |
Record each tool execution (args, output summary, duration, errors) |
record_node_events |
False |
Record every agent graph node |
redact_fields |
[] |
Argument / output keys replaced with [redacted] |
failure_cooldown |
30.0 |
Seconds to stop sending (and drop events) after a failed delivery. 0 retries every event |
flush_timeout |
5.0 |
Maximum seconds the end of the outermost run waits for pending events |
License
MIT
1 maintainer
Metadata
1 maintainer
Release files for trace-agent-pydantic-ai 0.4.0
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