The Agent Loop is the New OS

The Harness MCP (Model Context Protocol) server is designed to enhance agent infrastructure by minimizing context overhead and focusing on a small set of composable, self-describing abstractions. Inspired by systems like Unix, Git, and SQL, it emphasizes small, stable interfaces, uniform contracts, and runtime introspection. The server acts as a kernel, mediating access to underlying systems and enabling agents to operate efficiently by focusing on reasoning rather than parsing numerous endpoints. With a design that includes generic tools and a dispatch mechanism, the MCP server supports scalable capability growth while keeping the agent's context focused on essential reasoning tasks. By applying principles such as demand-paged schema discovery and centralized dispatch, the server optimizes for runtime selection and composition, which is crucial for the next generation of agent-native systems.