Antimatter Agent

ɅNTIMɅTTΞR is an AI-powered Unity editor toolkit designed to accelerate development by transforming natural-language prompts into real, executable editor actions. Built for Unity 2022.3+, it enables developers to move from concept to playable prototype with a structured, agent-style workflow that combines procedural worldbuilding, C# scripting, and automated scene construction. At its core, Antimatter introduces an intelligent editor workflow through a dedicated in-editor interface, allowing developers to describe scenes, systems, and gameplay elements in plain language. The system interprets these prompts and executes them using structured tool-calling—directly creating and modifying GameObjects, configuring components, generating scripts, and updating scenes inside the Unity editor. Unlike basic AI assistants that only generate text, Antimatter performs real editor operations through a plan-and-execution pipeline. Developers can review generated plans before execution, ensuring control, transparency, and iterative refinement during development. The toolkit includes robust procedural terrain generation, reusable Terrain Asset Profiles, and specialized layout systems for building city environments, road networks, racing tracks, and compact FPS-style levels. Scene-aware orchestration leverages project and hierarchy context to produce more accurate and coherent results. Antimatter is fully open-source and designed for extensibility, making it ideal for teams and developers who want to customize AI-assisted workflows within their own pipelines. The architecture is cleanly divided into Runtime and Editor assemblies, enabling seamless integration without polluting production builds. Importantly, Antimatter follows a BYOK (Bring Your Own Key) model. Developers connect their own API keys to supported AI providers—including OpenAI, Groq, Gemini, and other OpenAI-compatible endpoints—giving full control over usage, costs, and provider selection. Key Features - Open-source Unity editor toolkit with a modular, extensible architecture - AI-driven editor workflow via a dedicated Antimatter window - BYOK (Bring Your Own Key) support for OpenAI, Groq, Gemini, and compatible APIs - Prompt-based scene creation, editing, and iteration - AI-assisted C# script generation and modification - Structured tool-calling system for executing real Unity editor actions - Automated GameObject creation, transform adjustments, and component setup - Procedural terrain generation with reusable Terrain Asset Profiles - Scene-aware orchestration using project and hierarchy observation - Specialized layout tooling for cities, road systems, racing tracks, and FPS arenas - Visual plan-and-review pipeline before execution - Clean Runtime and Editor assembly separation for production-safe integration