Been digging deep into the Windows Endpoint Security Platform (WESP) in Win11 25H2, definitely one of the most fascinating security features Microsoft has built in a while. The concept is neat: compile rules to decision graphs in user mode, hand them to wesp.sys, and let the kernel evaluate them in-path while telemetry streams asynchronously in the background. I did an AI-assisted reverse engineering dive into the whole stack (wesp.sys, espclient.dll, and wesp_elam.sys), documented the wire protocols, disposition tables, and the enforcement gate, and built esptool, a research harness with 118 XML rule docs so anyone can test live telemetry and in-kernel blocking. Repo: github.com/marcosd4h/wesp_re… Tech doc: github.com/marcosd4h/wesp-re… Thanks to @yarden_shafir for putting this on my radar