AI Agent Protocol Stack Splits Into Three Layers: MCP, A2A, and Agent Plugins

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By August 2026, the AI agent ecosystem has settled into a clear three-layer protocol architecture, each serving a distinct purpose. MCP (Model Context Protocol) handles tool discovery and external integrations, and marked a major milestone with a stateless HTTP redesign and over 110 million monthly downloads. A2A (Agent-to-Agent Protocol) governs collaboration between agents, reaching its one-year anniversary with 150-plus organizations in production and native support across Google Cloud, AWS, and Azure. Agent Plugins 1.0, jointly released on August 6, 2026 by OpenAI, AWS, Microsoft, Vercel, Cursor, and GitHub, addresses packaging and distribution by bundling skill definitions, MCP configurations, and permission declarations into portable plugin units. Rather than competing, the three protocols are complementary, and developers are now expected to build modular, composable skill packages instead of monolithic agents.

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ProgrammingDEV Community ·

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