Unity ships official Codex plugin with 31 engineer-written skills
Unity released an official Codex plugin (Sept 16) with 31 skills written by Unity engineers—covering UI Toolkit, URP, IAP, multiplayer, and a unity-cli for Editors and packages—so Codex checks the project and verifies results against current APIs. It requires Unity 6+, installs in two commands, and follows Unity’s earlier Claude Code plugin.