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AWS, Azure, and GCP AI Agents Achieve Full Cross-Cloud Interoperability via A2A v1.0

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A developer completed a six-part series testing cross-cloud agent-to-agent (A2A v1.0) communication across all six directed paths between AWS Bedrock AgentCore, Microsoft Azure Foundry, and Google Cloud ADK on Cloud Run. Each deployment used a currency benchmark tool that ran in three modes: local MCP only, remote A2A delegation only, and a concurrent verified comparison of both results. All six directed edges were successfully deployed and measured, confirming A2A v1.0 interoperability across every cloud pairing. Key integration challenges included Azure's requirement for the correct Entra token audience and a specific Foundry Agent Consumer role, while AWS AgentCore required a custom JWT authorizer with OAuth client-credentials flow for non-AWS callers. A subtle AWS IAM trust policy bug also surfaced during GCP integration, where Google's condition key names map to different underlying token claims than their names suggest.

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AWS, Azure, and GCP AI Agents Achieve Full Cross-Cloud Interoperability via A2A v1.0 · ShortSingh