We Kept Rebuilding Our AI Agent. Here's What Survived - Fuad Ali, Arize AI
Arize AI's two-year agent rebuild reveals which architectural patterns survive real-world production iteration
“We use Alex to debug Alex.”
Fuad Ali from Arize AI walks through two years of iterating on their internal AI coding agent 'Alex,' surfacing hard decisions around plan ownership, memory, single-vs-multi-agent design, model selection, and testing. Notably, they built a meta-layer where a trace-reading agent called Signal debugs Alex, and Alex is used to debug itself. The talk offers practitioner-grade signal on what design patterns hold up in production agent systems, though it is specific to Arize's tooling rather than a broadly transferable finding.