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#UCP Universal Commerce Protocol

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The Six Key AI Agent Protocols Explained: MCP, A2A, UCP, AP2, A2UI, and AGUI

May 27, 2026·2 min

The Six Key AI Agent Protocols Explained: MCP, A2A, UCP, AP2, A2UI, and AGUI

Deep dive into six core AI agent protocols: MCP, A2A, UCP, AP2, A2UI, and AGUI — covering tool integration, multi-agent collaboration, commerce, payments, and dynamic UI, with Google ADK examples.