Unreal Engine 5.9 MegaJam Preview adds agent features, including an expanded Unreal MCP

Epic Games released the Unreal Engine 5.9 MegaJam Preview, which it calls the first Unreal Engine release built primarily with agentic workflows. It was timed for the Epic MegaJam.

The preview opens several new Experimental features, according to Epic: expanded toolsets in Unreal MCP, working with AI coding agents directly in the Editor, AI-assisted content creation, and running projects in a browser.