feat(llma): Add Pydantic AI instrumentation via OpenTelemetry#379
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feat(llma): Add Pydantic AI instrumentation via OpenTelemetry#379andrewm4894 wants to merge 14 commits intomasterPostHog/posthog-python:masterfrom feature/pydantic-ai-otel-exporterPostHog/posthog-python:feature/pydantic-ai-otel-exporterCopy head branch name to clipboard
andrewm4894 wants to merge 14 commits intomasterPostHog/posthog-python:masterfrom
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Add OpenTelemetry-based instrumentation for Pydantic AI agents:
- PostHogSpanExporter: Generic OTel exporter that translates spans to PostHog events
- PydanticAISpanExporter: Wrapper that normalizes Pydantic AI message formats and tool attributes
- instrument_pydantic_ai(): One-liner setup function for easy integration
Usage:
from posthog.ai.pydantic_ai import instrument_pydantic_ai
instrument_pydantic_ai(posthog_client, distinct_id="user_123")
agent = Agent("openai:gpt-4")
result = await agent.run("Hello") # Automatically traced
Co-Authored-By: Claude <noreply@anthropic.com>
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Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>
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Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>
Agent spans now create $ai_trace events so that child spans (tools, etc.) have a valid parent reference. Previously agent spans were skipped, which caused orphaned $ai_parent_id references in tool spans.
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Summary
Add OpenTelemetry-based instrumentation for Pydantic AI agents. This provides a foundation for OTel-instrumented AI frameworks.
New modules:
posthog.ai.otel- Generic OTel SpanExporter that translates spans to PostHog eventsposthog.ai.pydantic_ai- Pydantic AI-specific wrapper and setup functionUsage
Architecture
PostHogSpanExporter: Generic exporter following GenAI semantic conventionsPydanticAISpanExporter: Normalizes Pydantic AI message formats and tool attribute namesChanges
posthog/ai/otel/with generic OTel exporterposthog/ai/pydantic_ai/with Pydantic AI wrapper andinstrument_pydantic_ai()pip install posthog[pydantic-ai]orpip install posthog[otel]Test plan