Show HN: Cupcake – Better performance and security for coding agents (via OPA) (github.com)

Cupcake has been announced as a new policy enforcement layer designed to enhance performance and security for AI coding agents using Open Policy Agent (OPA) and Rego. By decoupling rule management from the model context, Cupcake optimizes how agents adhere to operational and security regulations. The tool intercepts agent actions, assesses them against user-defined policies, and allows for real-time feedback and corrections, effectively preventing undesirable actions and promoting safe coding practices. This innovative approach signifies a significant advancement in governance for AI/ML development tools, allowing organizations to maintain greater control over agent behaviors while improving safety measures. With its support for multiple agents such as Claude Code and Cursor, Cupcake enables the creation of enforceable "guardrails" that reflect existing operational rules. The model evaluation happens in mere milliseconds through fast, sandboxed WebAssembly execution, without consuming model tokens. As Cupcake aids developers in implementing robust policy enforcement, it illustrates a critical step toward integrating governance-as-code into AI workflows, enhancing both operational integrity and security across AI coding tools.