Locus

Locus for Unity - Open Source Unity Dev Agent

> Scale game development efficiency and free creators from tedious, repetitive work.

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Overview

Locus for Unity is an open-source AI Agent for Unity projects.

- In-editor operations: write C# code, read and modify Unity objects and assets, and complete the full feature development workflow
- Built-in hot reload: apply C# changes instantly without domain reloads, keeping Play Mode state intact
- Create editor UI with modern web tech: build Unity editor interfaces with Vue.js through the /view command, free of IMGUI's constraints
- Rider-grade static analysis: surface compiler-grade errors and warnings through built-in Roslyn semantic analysis the moment code changes
- Runtime analysis and debugging: autonomously operate and capture runtime state to help fix bugs and optimize performance
- Automated knowledge system: automatically summarize conversation requirements into design documents and preserve project understanding in long-term memory
- Visual version control: provide a visual version control interface with semantic diff analysis and conflict handling for Unity YAML assets
- Multiple model support: support subscription account sign-in and compatibility with multiple LLM API capabilities

Locus is currently in early testing. We welcome you to try it and share feedback through Issues. Your input is highly valuable to us.

What Makes Locus Technically Different?

Locus is a standalone Rust + Tauri + Vue.js application that runs as an independent process.

- We designed a proprietary intermediate representation that lets agents progressively read large scenes and assets, along with retrieval tools that help agents quickly locate target objects
- With Roslyn, Locus can JIT-compile and execute C# code inside the Unity Editor to make semantic asset edits. Locus also includes agent-side version management handling so users can review and revert asset and code changes the agent makes during a conversation
- Locus ships with built-in C# hot reload on par with commercial plugins. The agent's changes take effect without recompiling the assembly or running a domain reload, so Play Mode state is preserved — and the apply state is fully visible to the agent, which can confirm immediately whether a change actually landed
- Locus runs Roslyn semantic analysis in its own process, providing go-to-definition, find-references, hover info, and live diagnostics. The agent sees compiler-grade errors and warnings the moment it changes code, without waiting for Unity to compile; diagnostic coverage is close to Rider's live inspections, including finding where a field is referenced from UnityEvents, AnimationEvents, and scenes
- Built on Rust's parallel ecosystem, Locus performs highly parallel asset database scans, enabling fast semantic parsing for large scenes and reference queries for arbitrary assets. The Unity Editor API only provides dependency queries
- Locus includes an automated knowledge system. The agent summarizes fragmented conversation requests into design documents and saves working understanding into memory, reducing repeated project exploration
- Documents in the knowledge system sup

……（后略，见原文）