Unity

Unity's AI tools come in two forms: an assistant inside the Editor, and free connectors that let outside coding agents work on a project. Unity's AI tools page says the in-editor assistant can read the open scene, carry out tasks in the Editor and test its own edits; it runs on paid credits, and Personal edition users get a free trial that becomes a $10-a-month subscription. Unity is also dropping the "Unity AI" brand and naming each tool by its job.

Developers who already use an agent can go through the Unity CLI, which has a built-in MCP mode, or Unity's official plugin. MCP (Model Context Protocol) is a standard way for an agent to call an app's tools. Unity's documentation says the plugin works with Claude Code, Codex and Grok and needs Unity 6.0 or later, and the AI tools page says the CLI, MCP server and plugin cost nothing. In a September 9, 2026, blog post, Unity's Christopher Addison said the Claude Code plugin installs 29 skills, including one that controls a running Editor from the terminal. Bringing the plugin to Grok Build on October 1, Addison wrote that Unity doesn't "get to decide which coding agent you will use" (our story).

frederik (@froessell) wrote on X that Claude Code built most of the Unity 6 game Mowtopia in two days, with 60 passing tests. Compare engines in our AI game engines guide.

What to watch: Unity's Claude Code post says more skills will be added over time.