Built-in tip references non-existent 'frontend-design' plugin

Description

Claude Code's built-in tip system shows a tip suggesting users install a frontend-design plugin, but this plugin does not exist in any available marketplace.

The tip suggests running:

/plugin marketplace add anthropics/claude-code
/plugin install frontend-design@claude-code-plugins

Running this returns:

Plugin "frontend-design" not found in any marketplace

Evidence

The tip is tracked in .claude.json under tipsHistory as "frontend-design-plugin", alongside other legitimate tips like shift-enter, double-esc, git-worktrees, etc. The counter value shows it has been displayed to the user.

Expected Behavior

Built-in tips should only reference plugins that actually exist and are installable from a known marketplace.

Suggested Fix

Either:

1. Publish the frontend-design plugin to the claude-plugins-official marketplace
2. Remove the frontend-design-plugin tip from the tip rotation until the plugin is available

Environment

• Claude Code (CLI)
• macOS (Darwin 25.3.0)