Publisher: Open-Source Semantic Model Server for Malloy

Publisher is an open-source semantic model server built on the Malloy data language. It allows you to create rich semantic data models—defining the meaning, relationships, and context behind your data—and exposes them through a server interface. Applications, AI agents, and users can query data consistently and reliably, leveraging the shared understanding defined in the Malloy model. Publisher solves the problem of untrustworthy answers when data meaning is unclear. It uses Malloy queries, compiling them into SQL behind the scenes to deliver reliable answers without redefining data meaning in every tool. It consists of three main components: a server, an SDK, and a reference application, supporting various databases and AI applications.