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Google ADK and Microsoft Foundry Agents Connected via A2A Protocol in Cross-Cloud Test

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A developer benchmark has tested whether a Microsoft Azure Foundry-hosted agent can communicate with a Google ADK agent using the Agent-to-Agent (A2A) protocol without framework-specific glue code. The experiment used a currency conversion task, with a Microsoft Agent Framework coordinator on Azure invoking a Google ADK agent running on Google Cloud Run in three modes: local MCP only, remote A2A delegation, and a verified hybrid approach. Results confirmed cross-cloud A2A communication is possible after resolving a version mismatch, as the Microsoft client and Google ADK agent initially ran incompatible A2A protocol versions (v1.0 vs v0.3.0). Dependency conflicts between the two ecosystems required isolating environments and upgrading to google-adk 2.5.0 with a2a-sdk 1.1.2 before the handshake succeeded. The benchmark also measured latency and accuracy tradeoffs of remote agent verification, using numeric comparison rather than model judgment to assess result agreement between the two clouds.

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Google ADK and Microsoft Foundry Agents Connected via A2A Protocol in Cross-Cloud Test · ShortSingh