Saturday, 4th April 2026
AG-UI Protocol: The Missing Standard for AI Agent Interfaces
If you’ve built applications with AI agents, you’ve hit this wall: every framework has its own way of streaming responses to the UI. LangChain uses callbacks and streaming iterators. CrewAI returns completed results. AutoGen has its own message protocol. Amazon Bedrock Agents uses a proprietary streaming format. OpenAI Assistants has yet another event structure.
[... 1,959 words]AG-UI Protocol: A Layer-by-Layer Deep Dive with Real Network Captures
There’s a common misconception about AG-UI: people treat it as a transport protocol. It isn’t. AG-UI rides on top of HTTP and WebSocket — it doesn’t replace them. Understanding where each layer starts and stops is the key to debugging, optimizing, and building correctly with it.
[... 2,076 words]HTTP vs MCP vs A2A vs AG-UI: The Four Protocols of AgentCore Runtime
When you deploy an agent to AWS AgentCore Runtime, you pick a protocol: HTTP, MCP, A2A, or AGUI. This choice determines how your agent talks to the outside world — what it receives, what it sends back, and who it talks to. All four run on identical infrastructure. The differences live entirely in the framing and application layers.
[... 2,362 words]All Four AgentCore Protocols Are Just HTTP: What AG-UI, MCP, and A2A Actually Do
A question that comes up once you understand how AG-UI works: isn’t this just HTTP streaming with a defined event format? Could you achieve the same thing with the HTTP protocol if you defined the same output structure?
[... 1,489 words]