Nexus MCP
Nexus MCP turns VS Code / Cursor into an MCP proxy for Unreal Engine. It runs a local MCP server (default port 6900), auto-discovers running UE editor/PIE instances, and forwards AI tool calls to them over WebSocket. Your AI client (Cursor, CodeBuddy, Windsurf, ...) connects to one stable endpoint while the extension handles instance discovery, long-lived connections, and switching between multiple UE instances.
Blueprints, assets, PIE control, materials and other engine capabilities are provided by the UE-side NexusLink plugin — this extension is a proxy and does not implement game logic itself.
Requires the UE plugin
NexusLink (GitHub) · Download (Releases).
Install nexus-mcp-unreal-*.zip into your project's Plugins/Developer/NexusLink, enable it, then turn on Editor Preferences > Plugins > NexusLink > Enable MCP Server.
Getting started
- Set
nexusMcp.enabled to true in Settings (disabled by default; the proxy then listens on :6900).
- Point your AI client at
http://127.0.0.1:6900/stream — or run the command Nexus MCP: Copy MCP Client Configuration to copy a ready-to-paste config.
- With UE running and NexusLink's MCP server on, the status bar shows the connected project name.
Features
- Streamable HTTP MCP server with per-session isolation
- Automatic discovery of multiple UE instances via port scanning
- Connect / switch between UE instances from the status bar
- Transparent tool proxying; per-call
targetPort routing for multi-instance queries
Commands
- Nexus MCP: Refresh UE Instances
- Nexus MCP: Select UE Instance
- Nexus MCP: Disconnect
- Nexus MCP: Copy MCP Client Configuration
Source & docs: github.com/bytepine/NexusVSCode. All network traffic is bound to 127.0.0.1; no telemetry is collected.
Nexus MCP 让 VS Code / Cursor 充当 Unreal Engine 的 MCP 代理：本地运行 MCP 服务器（默认端口 6900），自动发现正在运行的 UE 编辑器/PIE 实例，并经 WebSocket 把 AI 工具调用转发给它们。AI 客户端（Cursor、CodeBuddy、Windsurf 等）只需连接一个固定端点，由扩展负责实例发现、长连接维持以及在多个 UE 实例间切换。
蓝图、资产、PIE 控制、材质等引擎能力由 UE 侧的 NexusLink 插件提供——本扩展仅做代理，不实现游戏逻辑。
需配合 UE 插件
NexusLink（GitHub） · 下载（Releases）。
将 nexus-mcp-unreal-*.zip 解压到项目的 Plugins/Developer/NexusLink，启用后在 Editor Preferences > Plugins > NexusLink > Enable MCP Server 勾选开启。
快速开始
- 在 Settings 中把
nexusMcp.enabled 设为 true（默认关闭；开启后代理监听 :6900）。
- 将 AI 客户端指向
http://127.0.0.1:6900/stream——或执行命令 Nexus MCP: 复制 MCP 客户端配置 一键复制可直接粘贴的配置。
- UE 已运行且 NexusLink 的 MCP 服务器已开启时，状态栏会显示已连接的项目名。
功能
- Streamable HTTP MCP 服务器，按会话隔离
- 通过端口扫描自动发现多个 UE 实例
- 在状态栏连接 / 切换 UE 实例
- 透明转发工具调用；多实例查询支持按调用指定
targetPort
命令
- Nexus MCP: 刷新 UE 实例
- Nexus MCP: 选择 UE 实例
- Nexus MCP: 断开 UE 连接
- Nexus MCP: 复制 MCP 客户端配置
源码与文档：github.com/bytepine/NexusVSCode。所有网络通信均绑定 127.0.0.1，不采集任何遥测数据。
