Microsoft Build 2026: Securing code, agents, and models across the development lifecycle

In this article Secure your code Secure your agents Trust agents with your data Secure your models Trust starts with security Today, developers and security teams are caught in growing tension. AI is accelerating development and introducing new issues around insecure code, opaque models, data exposure, and compliance. Add the challenges of shadow AI and tool sprawl and the result is a widening gap between innovation and control. As developers move faster, security teams struggle to keep up with visibility, governance, and oversight. The resulting friction across the development lifecycle is forcing a tradeoff between speed and safety that doesn’t need to exist. Security needs to move upstream to become part of how developers actually work: built into their day-to-day tools and connected to the tools security teams use. At Microsoft Build 2026 , we are announcing new security tools and capabilities to give developers clear guidance in real time, scale with the complexity of tasks, and provide security teams with a consistent view across the full lifecycle so innovation can move fast and securely without the business losing control. Learn more about our solutions to help secure your code, secure your agents, and secure your models. Secure your code Today’s headlines reflect the tension around the power of AI models and the potential threat they pose when used to find and exploit vulnerabilities. It is forcing a shift as security teams look for solutions to help them safely harness the power of these models. At the same time, developers want to use these same models to efficiently identify real, exploitable risk and remediate it within their flow of work. That’s why we developed the Microsoft Security multi-model agentic scanning harness (codename MDASH) and added native integration between Microsoft Defender and GitHub Code Security (part of the former GitHub Advanced Security suite) to help both security and developer teams identify and close gaps early. Discover and validate exploitable vulnerabilities with codename MDASH The new Microsoft Security multi-model agentic scanning harness (codename MDASH) is available in an expanded preview for eligible organizations and now includes integration with Microsoft Defender . This new agentic security system orchestrates a pipeline of more than 100 specialized AI agents using an ensemble of models to discover, validate, and prove exploitability across codebases written in popular programming languages. This approach is unique in the industry. Our multi-model agentic scanning harness uses a configurable panel of models, ranging from state-of-the-art (SOTA) models as the heavy reasoners, to more cost-effective models for high-volume operations. This allows us to trade speed, recall, and cost, and minimize dependency on any specific model. The combination of multiple models, hundreds of agents, and over 100 trillion signals a day helps identify real risk over theoretical noise, to help teams focus on what ca