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Google ADK and Amazon Bedrock tested in cross-cloud AI agent benchmark on A2A protocol

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Engineers ran a cross-cloud currency conversion benchmark with Google ADK as the master agent on Cloud Run (us-central1) calling an Amazon Bedrock AgentCore worker (us-east-1) via the A2A v1.0 protocol. The setup reverses a previous test where Bedrock served as the master and ADK as the worker. Three benchmark modes were used to isolate the cost of remote agent verification versus a direct MCP tool call baseline. Results from five warm invocations on July 31, 2026 showed the A2A remote-agent path was roughly six times slower than the MCP baseline, driven by model inference latency rather than network distance. Several integration bugs were documented and resolved, including a dropped A2A-Version header caused by AgentCore's request allowlist and an AWS identity token federation misconfiguration.

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Google ADK and Amazon Bedrock tested in cross-cloud AI agent benchmark on A2A protocol · ShortSingh