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Microsoft Rayfin simplifies backend deployment on Fabric for developers and AI agents

Feeds.4Sysops •IT News • June 3, 2026

Microsoft has introduced Rayfin, an open-source software development kit and command-line interface designed to streamline application backend development. This tool allows developers and AI coding agents to define data models, business logic, and access policies entirely through code. By targeting Microsoft Fabric as the deployment target, the solution eliminates the need for manual configuration of disparate infrastructure services. 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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Microsoft Fabric