This is a feature-rich open-source Unity MCP server providing 330+ tools, the most comprehensive among competitors (compared to Bezi and Coplay MCP), and it's free. It's especially well-suited for developers using Claude Cowork, thanks to its two-tier tool system that optimizes tool list size. However, it requires environment configuration awareness and carries data manipulation risks, so backups are recommended.
The AnkleBreaker Unity MCP server is the most comprehensive Model Context Protocol (MCP) server for Unity game development. It connects MCP-compatible AI assistants like Claude, Cursor, and Windsurf to Unity Editor and Unity Hub via an HTTP bridge. It provides 330+ tools across 30+ categories, including scene management, GameObjects, components, rendering, builds, profiling, Shader Graph, Amplify Shader Editor, terrain, physics, NavMesh, animation, multiplayer, assets, scripts, and testing. It uses a two-tier tool system: about 70 core tools are always exposed directly, while the remaining 254 are accessed via a unity_advanced_tool proxy with lazy loading to avoid overwhelming MCP clients. It supports multi-instance, multi-agent, port resilience, and crash detection. Fully free and open source under the AnkleBreaker Open License, but reselling is forbidden.