Cursor 3 is a new version of the Cursor platform, a unified workspace for building software with agents. It introduces a new interface that brings clarity to the work agents produce and allows for seamless handoff between local and cloud agents. The platform also includes features such as a multi-repo layout, integrated browser, and plugins on the Cursor Marketplace. The goal of Cursor 3 is to provide a better way to code with AI and to build more autonomous agents.