AI Agentic Intelligence Digest

The six-layer agent stack is here — and security is already the weak link

This issue covers four signal-rich developments from the first week of June 2026: O'Reilly's definitive six-layer agent stack map, an arXiv paper framing agentic engineering as a new discipline, the AgentRedBench security benchmark exposing attack-success rates of 32–81% across frontier models, and Google's iterative Agentic RAG shipping to enterprise preview.