> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mossx.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Extensions

> Open the Extensions view from the left bar, check usage, and manage Skills and MCP.

**Extensions** in the left bar sits at the same level as **Home**. After you open it, the center becomes a top bar instead of the chat canvas.

<img src="https://mintcdn.com/mossx-docs/kz4nt5KFSKzkAZwe/images/desktop/extensions-view.png?fit=max&auto=format&n=kz4nt5KFSKzkAZwe&q=85&s=d9b6f450a588f16d0fd1c3ddeeb9ad54" alt="Extensions entry in the left bar and the top bar" width="100%" data-path="images/desktop/extensions-view.png" />

The top bar has two groups:

| Group                | Entry                                                          | What it does                                      |
| -------------------- | -------------------------------------------------------------- | ------------------------------------------------- |
| Stats and frameworks | **Usage**                                                      | Local token usage dashboard                       |
| Stats and frameworks | **AI frameworks**                                              | Not shipped yet                                   |
| CLI extensions       | **Skills** / **Mcps**                                          | View and manage configured items                  |
| CLI extensions       | **Plugins**, **Hooks**, **Rules**, **Commands**, **Subagents** | Top-bar entries exist; content is not shipped yet |

## Usage

This page opens by default. Usage comes from local `tokentracker-cli`, not from CC GUI telemetry.

The first time you open it, the app checks whether that CLI is installed. If it is not, click **Install** or run the command in a terminal and then click **Detect again**:

```bash theme={null}
npm i -g tokentracker-cli
```

After install, a local service starts and aggregates token usage from installed AI tools. On first start, that service writes hooks into those tools so it can collect data. The desktop app turns off anonymous telemetry for it.

The dashboard can show usage by day / week / month. Cost estimates depend on the model prices you add in the provider settings.

## Skills

**Extensions → Skills** is for viewing and installing skills you add yourself.

It is not the same as the built-in curated Skills in **Settings → Other settings**: curated skills ship with the app and can inject automatically during chat; skills here need an explicit call or a description match.

Details: [Skills](/en/desktop/customize/skills).

## Mcps

**Extensions → Mcps** lists configured MCP servers for Claude Code / Codex. You can refresh, filter by source, and enable or disable them.

To add a server, still write it using each runtime's config convention, then come back here and refresh. The Marketplace entry is still Coming Soon.

Details: [MCP](/en/desktop/customize/mcp).

## Entries not shipped yet

**AI frameworks**, **Plugins**, **Hooks**, **Rules**, **Commands**, and **Subagents** currently say they are coming soon. Do not configure them as shipped features.

Agents and the prompt library are not in Extensions. The entry is **Settings → Agents / prompts**. See [Agents and prompt library](/en/desktop/customize/agents-prompts).