Microsoft Build 2026 demo showcasing Microsoft Foundry and Agent 365, a platform for building, deploying, and governing AI agents at enterprise scale. Key features include Foundry Toolbox for centralized tool management via a single MCP endpoint, PII guardrails, GitHub Actions-based deployment, dedicated microVM sessions with persistent file systems, server-side traces, and built-in evaluations. New capabilities include auto-generated rubric evaluators derived from production traces and an agent optimizer that tunes model, instructions, tool descriptions, and skills to continuously improve agent performance. Agents can be published to Microsoft Teams and M365 Copilot as autopilot agents with their own identity and productivity license, with admin approval workflows and ongoing monitoring for enterprise governance.