Google ADK as the Master Agent, Calling Amazon Bedrock over A2A
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Another cross-cloud A2A implementation, still novel and highly relevant despite series overlap.
Google ADK on Cloud Run acting as a master agent over A2A v1.0 exposed six cross-cloud interoperability defects when calling Amazon Bedrock AgentCore workers—including an A2A protocol version mismatch (v0.3 vs v1.0), a missing sse_starlette dependency that broke container startup, and an IAM trust policy that silently failed because AWS maps the `accounts.google.com:aud` condition key to the token's `azp` claim rather than the intended audience. These bugs were invisible in local tests and only surfaced during the reversed-role deployment, highlighting the fragility of multi-cloud agent orchestration.