Microsoft Sentinel's Three-Layer Architecture: Data Lake, Security Graph, and MCP Server for AI-Driven Defense
By
Dave R - Microsoft Azure & AI MVP☁️
Crisped on the outside, thoughtful enough on the inside.
Summary
A technical walkthrough of Microsoft Sentinel's architectural transformation from a traditional SIEM into a layered security platform. The article breaks down three core layers: an open-format data lake for flexible data storage, a relationship graph for security context and connections, and a hosted MCP (Model Context Protocol) server that enables AI agents to perform autonomous defensive actions. The piece explains how these three layers work together to power agentic defense capabilities.
Key quotes
· 3 pulledMicrosoft Sentinel has changed in a way that is easy to miss if you still think of it as a SIEM.
Over the past year, it has been rebuilt into a layered security platform, and this article is a technical walkthrough of that architecture.
I will break down the three layers that make it work — an open-format data lake, a relationship graph, and a hosted MCP server for AI agents — explain what each one do
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