An MCP server and plugin that connects AI agents like Claude and Cursor to Unity for AI-assisted game development and runtime AI integration.
Unity MCP is an open-source implementation of the Model Context Protocol (MCP) for the Unity game engine. It allows AI agents like Claude and Cursor to interact directly with Unity, enabling AI-assisted development, automated testing, and runtime AI integration within games. The project solves the problem of manual, repetitive game development tasks by providing a natural-language interface to Unity's API.
Unity developers and game studios looking to integrate AI into their development workflow for automation, rapid prototyping, and creating dynamic, AI-driven game experiences. It's also for developers building AI-powered tools or runtime features within Unity games.
Developers choose Unity MCP because it offers a vendor-agnostic, extensible bridge between any MCP-compatible AI agent and Unity, with unique runtime capabilities for in-game AI. Its reflection system and easy custom tool creation allow for deep integration with existing project code, unlike generic AI coding assistants.
AI Skills, MCP Tools, and CLI for Unity Engine. Full AI develop and test loop. Use cli for quick setup. Efficient token usage, advanced tools. Any C# method may be turned into a tool by a single line. Works with Claude Code, Gemini, Copilot, Cursor and any other absolutely for free.
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Supports Claude, Cursor, Copilot, and other MCP clients with no lock-in, as highlighted by the wide range of client logos and the claim 'no vendor lock-in' in the README.
Enables AI tools inside compiled games for dynamic NPC behavior or debugging, a feature explicitly noted as working 'inside your compiled game' unlike other tools.
Provides over 100 ready-to-use MCP tools for asset, scene, and scripting operations, documented in a detailed reference with categories like 'Project & Assets' and 'Scene & Hierarchy'.
Allows AI to discover and call any C# method, including private ones, via the 'reflection-method-call' tool, enabling deep integration with custom project code.
Exposes any C# method as an AI tool with a single [McpPluginTool] attribute, demonstrated in code examples for quick project-specific automation.
Requires multiple steps: installing plugins, configuring AI agents, and managing MCP servers, with the README warning that 'Project path cannot contain spaces' and offering CLI, Docker, and manual options that add overhead.
Reflection access allows AI to call private methods indiscriminately, which could lead to unintended behavior or vulnerabilities if not carefully managed, especially in runtime game usage.
While extensible, the project lists only a few official extensions (e.g., AI Animation), suggesting a limited third-party ecosystem compared to established Unity asset store tools.
Runtime usage within games may introduce latency from AI processing and reflection calls, which could be problematic for performance-critical applications, though not explicitly addressed in the README.