LinkedIn tore down its GenAI stack and rebuilt it for scale—with agents, not monoliths. The new setup leans on distributed, gRPC-powered systems. Central skill registry? Check. Message-driven orchestration? Yep. It’s all about pluggable parts that play nice together. They added sync and async modes for invoking agents, wired in OpenTelemetry for observability that actually tells you things, and embraced open protocols like MCP and A2A to stay friendly with the rest of the ecosystem. **System shift:** Think less "giant LLM in a box" and more "team of agents working in sync, speaking a shared language, and running on real infrastructure."