VSCodex

VSCodex is a Visual Studio extension that brings OpenAI Codex into the IDE as a docked, theme-aware developer tool window. It is designed for developers who want Copilot-style editor integration plus explicit control over model selection, failover behavior, MCP servers, skills, memory, prompt context, analytics, approvals, sandboxing, and task orchestration.

The extension is built as a classic in-process Visual Studio VSIX using ReactiveUI.WPF, ReactiveUI.Extensions, and System.Reactive.

Getting Started

1. Install Node.js LTS and restart Visual Studio so node and npm are available to the IDE process.
2. Install @openai/codex-sdk globally.
3. Install @openai/codex globally if you want the CLI fallback transport.
4. Authenticate Codex/OpenAI from PowerShell if your account requires it.
5. Install VSCodex from the Marketplace or build the VSIX locally.
6. Open Visual Studio. VSCodex opens on first run and can be reopened from the VSCodex, View, Tools, editor context, project, solution, error, and debug menus.
7. Open the VSCodex tool window, select Settings, and run setup validation if prompted.