[bot] Missing instrumentation for Google ADK (Agent Development Kit) Java SDK

[braintrust-bot]

Summary

The Braintrust Java SDK does not instrument the Google Agent Development Kit (ADK) for Java (com.google.adk:google-adk). Google ADK is an official agent framework providing code-first agent execution, tool calling, and multi-agent orchestration. Braintrust already supports Google ADK instrumentation for Python (via setup_adk()) and Go (via traceadk.AddLLMAgentCallbacks()), but the Java SDK has no equivalent instrumentation.

What is missing

The com.google.adk:google-adk SDK provides these execution surfaces, none of which are instrumented:

API surface	Description
LlmAgent / agent execution	Core agent run/invocation with LLM-backed reasoning
Tool execution	Built-in and custom tool calling during agent runs
Multi-agent orchestration	Hierarchical composition of specialized agents
Session management	Stateful agent session execution

The SDK is available on Maven Central (com.google.adk:google-adk) at version 1.1.0 (April 2026). It depends on OpenTelemetry for observability and is actively maintained by Google (1,001 commits, 1.5k stars).

Note: While this repo instruments com.google.genai (the Google GenAI SDK), Google ADK wraps agent execution flows around model calls. Instrumenting only the underlying GenAI SDK misses the agent-level spans (agent invocations, tool calls, multi-step reasoning, parallel flows) that the Python and Go integrations capture.

There is no reference to google-adk, com.google.adk, or LlmAgent anywhere in this repository — no instrumentation module, no tests, no examples, no dependencies.

Braintrust docs status

• Google ADK is listed as a supported agent framework at https://www.braintrust.dev/docs/integrations (under "Agent Frameworks")
• The Google ADK-specific docs page describes Python and Go instrumentation only: not_found for Java SDK support

Upstream sources

• Google ADK Java repository: https://github.com/google/adk-java
• Google ADK documentation: https://adk.dev/ (redirected from https://google.github.io/adk-docs/)
• Maven Central: https://central.sonatype.com/artifact/com.google.adk/google-adk — v1.1.0 (April 2026)
• Braintrust Google ADK integration (Python/Go): https://www.braintrust.dev/docs/integrations/agent-frameworks/google — documents setup_adk() and traceadk.AddLLMAgentCallbacks()

Local files inspected

• settings.gradle — lists all instrumentation modules; no ADK module present
• braintrust-sdk/instrumentation/ — contains openai_2_8_0, anthropic_2_2_0, genai_1_18_0, langchain_1_8_0, springai_1_0_0, aws_bedrock_2_30_0; no ADK directory
• Full-repo grep for google-adk, com.google.adk, LlmAgent — zero matches