Microsoft Foundry as the Master Cloud, Google ADK as the Client: Cross-Cloud A2A v1.0
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Cross-cloud A2A with Microsoft and Google is cutting-edge multi-agent orchestration, highly strategic.
Microsoft Foundry (Azure) acts as the master cloud hosting the currency exchange agent and its MCP stdio tool, while Google ADK runs as a thin authenticated client on Cloud Run, delegating all orchestration via A2A v1.0/JSON-RPC over Microsoft Entra. The architecture deliberately keeps the tool with the master to enforce that capability lives in Azure, avoiding the common anti-pattern of proxying an MCP server. Deployed live across us-central1 and eastus2, the setup exposed four hidden authentication-and-discovery issues invisible to unit tests.