This blog post explores how six key protocols, including MCP and A2A, simplify AI agent development by replacing custom integration code with standardized communication patterns. Learn how to use the Agent Development Kit (ADK) to build complex agents capable of managing real-time inventory, secure commerce via UCP/AP2, and interactive streaming interfaces. Discover how adopting these architectural standards creates more scalable, interoperable, and user-friendly AI solutions.

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A practical guide to six AI agent protocols (MCP, A2A, UCP, AP2, A2UI, AG-UI) demonstrated through building a restaurant supply chain agent using Google's Agent Development Kit (ADK). Starting from a bare LLM, the guide adds protocols incrementally: MCP for tool/data connectivity, A2A for inter-agent communication, UCP for standardized commerce, AP2 for payment authorization with audit trails, A2UI for declarative UI rendering, and AG-UI for streaming frontend events. Each protocol is shown with working code samples and explained in terms of the specific integration problem it eliminates.

Developer’s Guide to AI Agent Protocols

Putting It All Together: The Agent in Action