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Microsoft launches Rayfin and HorizonDB to secure and scale autonomous AI agents

Feeds.4Sysops •IT News • June 4, 2026

Microsoft introduced Rayfin, an open-source SDK and CLI designed to provide an enterprise-grade backend for applications built by autonomous AI agents. This tool allows developers to define data models and authentication in code, which Rayfin then deploys directly to the Microsoft Fabric platform. To ensure security, Microsoft also unveiled a new containment framework and runtime controls to keep these autonomous agents within governed boundaries. Source

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Microsoft Unveils Rayfin and HorizonDB for AI Security and Scalability On June 4, 2026, Microsoft launched Rayfin, an open-source SDK and CLI aimed at enhancing the security and scalability of autonomous AI agents. Rayfin allows developers to define data models and authentication through code, deploying directly to the Microsoft Fabric platform. Alongside Rayfin, Microsoft introduced HorizonDB, which supports the backend needs of these AI agents. The new tools include a containment framework and runtime controls to ensure that AI agents operate within governed boundaries. This initiative is expected to impact developers and organizations utilizing Microsoft Fabric for AI applications. The launch emphasizes the importance of security in the rapidly evolving AI landscape. Current status indicates that these tools are now available for developers to integrate into their applications. 2 sources 19

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HorizonDB Microsoft Fabric Rayfin