> Source: Onevium official documentation
> Article: Install, enable, and verify plugins
> Original URL: https://onevium.com/docs/plugins
> Language: English
> Updated: 2026-09-09
> Applies to: 1.1.22
> Feature status: Released

---

# Install, enable, and verify plugins

Review a plugin source and contents, install and enable it, then verify one actual capability.

## What you can install

Plugins package Skills, Agents, hooks, or MCP servers. This walkthrough uses **Frontend Design**, published by Anthropic in the official `claude-plugins-official` marketplace. It supplies a frontend-design Skill; it is not Onevium's built-in Widget tool. See the [official plugin description](https://github.com/anthropics/claude-plugins-official/blob/main/plugins/frontend-design/README.md).

## Open plugin management

Open the right-side **Plugins** tab, identified by the package icon. If the right panel is hidden, its default toggle is **Option+Command+B** on macOS or **Alt+Ctrl+B** on Windows/Linux. Click **Browse plugins**.

The list comes from marketplaces already downloaded in your Claude environment. An official marketplace may be available without this particular plugin being installed. You need a working model connection to use its Skill after installation.

## Install Frontend Design

1. In **Browse plugins**, search for `frontend-design`.
2. Check the source is `claude-plugins-official` and the author is Anthropic. The full identifier is `frontend-design@claude-plugins-official`.
3. Click **Install** and wait for it to appear under **Installed**.
4. Open its details. Check **Source**, **Scope**, and the supplied **Skills**; switch it on if disabled.
5. Start a new conversation in a small frontend project so the runtime can load the plugin.

| Detail                | How to use it                                                               |
| --------------------- | --------------------------------------------------------------------------- |
| Source                | Distinguishes identical names from different marketplaces                   |
| Scope                 | Shows where this installation is available; do not assume project isolation |
| Skills / Agents / MCP | Shows what the package actually contributes                                 |
| Enable switch         | Controls whether the installed plugin is available to subsequent work       |

## If the official marketplace is missing

A marketplace address and a downloaded catalog are different. In 1.1.22, **Add Marketplace** records the address; that button alone does not download the catalog.

If you use a Claude Code CLI configured for the **same user and configuration directory as Onevium**, register or refresh the official catalog there:

```bash
claude plugin marketplace add anthropics/claude-plugins-official
claude plugin marketplace update claude-plugins-official
```

Run the add command only if the marketplace is absent. Reopen **Browse plugins**, search again, and continue when the actual listing appears. These are terminal commands, not promises that every upstream slash command works in Onevium chat. The [official marketplace guide](https://code.claude.com/docs/en/discover-plugins) explains registration and refresh.

## Try the installed Skill

In the new conversation, ask for a small artifact:

```text
Use the frontend-design Skill from frontend-design@claude-plugins-official.
Create demo-settings.html with a compact notification-settings panel.
Include labels, a save button, and an empty state; use fictional data.
Write only this demo file, then show how to preview it.
```

Check that the Skill is invoked or read, that its source is the official plugin, and that the file opens. The plugin is a Skill-based workflow; a separate slash command is not required. Keep the demo file separate from your app until you decide to integrate it.

## Enable, inspect, and uninstall

Open an installed plugin to inspect its supplied capabilities. Use its switch to disable it, then test in a new conversation. To remove it, choose **Uninstall** and confirm the second prompt.

The 1.1.22 plugin panel exposes install, enable/disable, and uninstall; it has no dedicated update button. For an update, use the corresponding operation in the same Claude CLI environment and reload the runtime before checking its version and capabilities.

## Solve common problems

| Symptom                            | Next action                                                                              |
| ---------------------------------- | ---------------------------------------------------------------------------------------- |
| No marketplace or no results       | Register/download the official catalog in the matching Claude environment; reopen Browse |
| Install error                      | Read the displayed error; check network and the full `name@marketplace` identifier       |
| Installed but unused               | Check the enable switch and supplied Skills, then open a new conversation                |
| Plugin includes MCP but tools fail | Open the MCP server entry and check its required URL, credentials, and connection        |

## Next steps

Learn [Skills](https://onevium.com/docs/skills), connect an [MCP server](https://onevium.com/docs/mcp-servers), or use the [workflow tips](https://onevium.com/docs/workflows/tips) to choose between built-in tools and installed capabilities.