[Bug] Plugin Manager UI ignores project scope boundaries in Marketplace view

Plugin Manager: Plugins installed in other project scopes are invisible but block Discover tab

Channel: GitHub Issue (Public)
Repository: https://github.com/anthropics/claude-code/issues
Submitted: [DATE]

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Summary

When a plugin is installed with project scope in Project A, opening Project B shows the plugin as "installed" in the Marketplace view, but it's:

• Not listed in the "Installed" tab (correctly filtered by current project)
• Not shown in the "Discover" tab (incorrectly hidden because it's "installed" somewhere)

This creates a UI dead-end where users cannot find or install the plugin in their current project.

Environment

• Claude Code version: 2.1.31
• OS: macOS

Steps to Reproduce

1. In Project A: Install any plugin with project scope (e.g., "superpowers")
2. Open Project B (different directory)
3. Open plugin manager (/plugin)
4. Navigate to Marketplace → browse Anthropic marketplace

• Observe: Plugin shows "installed" badge

1. Check "Installed" tab

• Observe: Plugin is NOT listed

1. Check "Discover" tab

• Observe: Plugin is NOT shown

Result: Plugin is unreachable from current project's UI.

Root Cause

The plugin manager uses three data sources with inconsistent scope filtering:

| Component | Checks | Scope-Aware? |
|-----------|--------|--------------|
| Marketplace "installed" badge | installed_plugins.json | No (any scope triggers badge) |
| Installed tab listing | installed_plugins.json | Yes (filters by projectPath) |
| Discover tab visibility | installed_plugins.json | No (hides if installed anywhere) |

The Discover tab hides plugins present in installed_plugins.json regardless of whether they're installed in the current project scope.

Expected Behavior

Any of these would fix the issue:

1. Discover tab should show plugins not installed in the current scope, with an "Install in this project" option
2. Marketplace badge should indicate scope (e.g., "Installed in: other-project")
3. Installed tab could show all installations grouped by scope

Workaround

Manually edit ~/.claude/plugins/installed_plugins.json or navigate to the original project to uninstall, then reinstall in the desired project.

Additional Context (for Anthropic Support Correlation)

Full details including file evidence submitted via /feedback Feedback ID: e5812f37-196d-4c80-965c-46d1b6fc9e7d