fiddler-adk

Fiddler SDK for instrumenting Google ADK (Agent Development Kit) with OpenTelemetry.

This package lives in the fiddler-sdk monorepo under packages/integrations/fiddler-adk/. It depends on fiddler-otel for the OTel pipeline, span attributes, and span processing.

Install

pip install fiddler-adk

Usage

from fiddler_otel import FiddlerClient
from fiddler_adk import GoogleADKInstrumentor

client = FiddlerClient(
    api_key='YOUR_API_KEY',
    application_id='YOUR_APPLICATION_ID',  # UUID4 from the Fiddler GenAI Applications page
    url='https://your-instance.fiddler.ai',
)
GoogleADKInstrumentor(client).instrument()

# Build and run ADK agents as usual — traces flow to Fiddler automatically.

How it works

Google ADK emits OpenTelemetry spans natively (invoke_agent, call_llm, execute_tool, ...) through a tracer that resolves against the global tracer provider. GoogleADKInstrumentor.instrument():

  1. Sets up an isolated Fiddler tracing pipeline. Uses FiddlerClient to initialise a dedicated tracer, provider, processor, and OTLP exporter. The client's provider is promoted to global so ADK's gcp.vertex.agent tracer resolves to it. The SDK operates in standalone mode — it does not interact with customer-configured tracers or providers.
  2. Propagates session identity. ADK sets gen_ai.conversation.id on child spans (invoke_agent, call_llm, etc.) but not on the parent invocation root span. The ADKSpanProcessor backfills it to the root so the Fiddler UI can group all spans in a turn under the same session.

Span-type classification, content extraction (LLM input/output, tool I/O, system instructions), and attribute normalization are handled by the Fiddler backend — the SDK does not parse or transform ADK's content attributes.

Supported versions

  • google-adk >= 1.34.2
  • opentelemetry-api >= 1.37.0
  • Python 3.10+

Content capture

ADK includes full LLM request/response payloads in span attributes by default. Set ADK_CAPTURE_MESSAGE_CONTENT_IN_SPANS=false to disable ADK's payload capture if your prompts may contain PII.

See examples/ in this directory for a runnable agent.

Project links

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Credits

Author: Fiddler AI

GitHub Statistics

Data verified by PyPI on Jun 17, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License expression

Apache-2.0
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Requires

Python >=3.10

Provides Extra

examples

Tags

fiddler ai genai llm monitoring observability instrumentation google-adk adk opentelemetry

Classifiers

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