Tour of Agent Protocols: MCP, A2A, AG-UI, A2UI
summary
Covers four concrete protocols with code and live demos: MCP for exposing tools, resources, prompts via fastmcp 2.0 over standard IO or streamable HTTP transport (includes elicitation and progress; sampling deprecated), A2A using JSON agent cards and skills plus an A2A inspector and client for request/response or long-running tasks, AG-UI as event middleware with an ADK middleware demo, and A2UI generating JSON UI surfaces (catalog, create/update/data/delete messages); demos use Gemini CLI, ADK and Cloud Run and mostly work though LLM latency causes occasional flakiness.
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chapters (13)
- 0:00Introduction
- 2:17Four agent protocols overview
- 3:43MCP protocol deep dive
- 21:23MCP tools, resources, prompts
- 23:54MCP features elicitation progress
- 24:15A2A protocol agent communication
- 32:45A2A agent cards and skills
- 36:17A2A client-server interaction
- 41:22AGUI protocol frontend connection
- 43:52AGUI Interactive Dojo demo
- 45:19A2UI protocol generative UI
- 49:12A2UI restaurant booking example
- 52:29A2UI tools and components
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