Introducing Unity CLI, a terminal-native path for connecting AI agents and CI pipelines

Unity has launched Unity CLI, a new terminal-native tool that lets developers connect AI agents, continuous integration systems, and custom tools directly to the game engine. Unity CLI was developed in direct response to developer feedback, aiming to make workflows more predictable and extensible while addressing actual user needs.

With this release, automation and agentic workflows are now accessible straight from the command line. Developers can run arbitrary code rapidly using the eval command, powered by the Roslyn compiler, which avoids lengthy compilation and domain reloads. This approach reduces waiting times during development and improves efficiency.

Building on its flexible design, Unity CLI supports integration with any AI agent or model, including Claude Code, Codex, GitHub Copilot, and local solutions. Developers can further tailor workflows by writing custom commands that enable agents to access detailed, project-specific context. The CLI provides direct access not just to Unity's editor but also to runtime environments, facilitating live debugging, game-state modifications, and automated playtesting.

While Unity MCP remains fully supported, the new CLI is now the recommended option. To support a seamless transition, Unity CLI includes an MCP Mode for backward compatibility, ensuring existing MCP agents remain functional. Both the CLI and MCP are available free of charge, with no concurrency limits on the MCP server.