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Google ADK Benchmarks Cross-Cloud A2A Calls to Amazon Bedrock in Three Modes

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A developer ran a cross-cloud currency benchmark with a Google ADK master agent on Cloud Run (us-central1) delegating tasks to an Amazon Bedrock AgentCore worker running Strands Agents on Nova Micro (us-east-1) via the A2A v1.0 protocol. The benchmark tested three modes — MCP-only, A2A-only, and a concurrent verified mode — to isolate the cost of remote agent calls from a simple tool baseline. Results from five warm invocations on July 31, 2026 showed the A2A remote-agent hop was roughly six times slower than the MCP tool baseline, with a median latency of 18.92 seconds versus 2.96 seconds. Notably, the verified mode, which ran both calls concurrently and compared results, was not slower than A2A-only, thanks to parallel execution using asyncio. The project also documented several integration pitfalls, including AWS identity token validation failures, a dropped A2A-Version header in AgentCore's runtime, and incorrect base URLs that caused cross-cloud routing to fail.

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Google ADK Benchmarks Cross-Cloud A2A Calls to Amazon Bedrock in Three Modes · ShortSingh