Detection engineering is about more than alerts and SIEM rules; it is the practice of understanding attacker behaviour and building the visibility needed to detect it. As AI becomes embedded into enterprise environments through agents, copilots, and connected ecosystems, organisations face new identity, data, and supply chain risks that are difficult to monitor using traditional approaches. This talk explores how detection engineering can help illuminate these emerging threats and asks a bigger question: if every breach contains valuable lessons, why does cybersecurity still lack an effective way to share them with the wider industry?