Show HN: Open-source Unity MCP for game developers (github.com)

MCP for Unity is an open-source bridge (maintained by Coplay) that lets LLM-powered assistants (Claude, Cursor, VS Code Copilot, etc.) directly control the Unity Editor via a local Model Context Protocol (MCP) client. By exposing a rich set of editor tools—asset/scene/shader/GameObject management, menu execution, console reads, and script operations including atomic text edits and structured C# method/class edits—it enables natural-language orchestration of routine and complex Unity tasks, from scene assembly and shader creation to automated build or testing workflows. This lowers the barrier for using LLMs to speed prototyping, automate repetitive work, and integrate AI into game dev pipelines. Technically, MCP for Unity comprises a Unity Bridge package (installed via Package Manager or OpenUPM) and a Python MCP Server (requires Python 3.12+ and the uv tool) that mediates between the Editor and clients. Optional Roslyn integration (Microsoft.CodeAnalysis) enables full C# compiler diagnostics for strict validation; without it the system falls back to basic structural checks. Installation supports auto-setup for common clients or manual JSON configuration with platform-specific examples. The project is extensible (custom tools, dev hot-reload, backups), MIT-licensed, and includes privacy-focused anonymous telemetry with an easy opt-out—making it a practical, developer-friendly way to bring LLM-driven automation into Unity projects.