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CC GUI for VS Code ships as an extension. The publisher is MossX, and the extension ID is MossX.vscode-cc-gui.

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Prerequisites

You can install it on macOS, Windows, and Linux. Before you start a chat, you also need Node.js 20+. See Prepare your environment.

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Install from the Marketplace

1

Open the Extensions view

Click Extensions in the VS Code Activity Bar, or press Cmd+Shift+X (Windows / Linux: Ctrl+Shift+X).
2

Search for CCGUI

Type CCGUI or CC GUI in the search box. The full display name is CCGUI / CC GUI（Claude Codex OpenCode Kimi）, and the publisher is MossX.
3

Install

Click Install and wait for VS Code to download and activate the extension.
4

Open CC GUI

Click the CC GUI icon in the Activity Bar, or run CC GUI: Open CC GUI from the Command Palette.
Search for CCGUI in the Marketplace You can also open the Marketplace page in a browser and click Install: https://marketplace.visualstudio.com/items?itemName=MossX.vscode-cc-gui

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Confirm the install

After install you should see:
  • A CC GUI icon in the Activity Bar
  • A set of commands when you type CC GUI in the Command Palette
  • An entry on the right side of the editor title bar that opens the panel
If the sidebar is empty, open a workspace folder first. CC GUI needs the workspace root for file mentions, sessions, and the working directory.

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Next step

Installing only adds the UI to VS Code. To send a message, continue with Prepare your environment: check Node.js, install the Claude / Codex SDKs, and install local CLIs if you need them.