Connecting Through Standard Protocols: Choosing Between AG-UI, AI SDK UI and Our Own SSE Contract
Choosing between your own SSE contract, AG-UI and AI SDK UI comes down to the backend, the number of clients and the bundle and wire cost you accept. In this post we connect the same assistant to Angular over all three, and measure AG-UI's defaults sending the model's reasoning to the browser in a 368 KB stream, the two protocol libraries adding 500-680 kB to the page, and an abort arriving as RUN_ERROR.
14 Nov 2026
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16 min
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