/ slash-command skill picker shows phantom skills mis-namespaced under wrong plugin

[rmatthews-clgx]

Describe the bug

Typing / in the interactive prompt opens a skill/command picker. Entries are shown under an installed plugin's namespace, but several of them are not actually bundled with that plugin and fail when invoked.

Specifically, after installing a plugin from a private marketplace that only configures MCP servers (no skills), the / picker still lists several skill-style entries (e.g. names unrelated to the plugin's actual purpose) all namespaced under that plugin's prefix.

None of these are real. The installed plugin's own plugin.json declares zero skills (only a handful of MCP server integrations), and there is no skills/ directory in the installed plugin's cache on disk. One of the phantom entries actually corresponds to a completely separate, independently-installable plugin in the same marketplace — so the picker is misattributing an unrelated plugin's skill to the wrong namespace.

copilot skill list (the authoritative/ground-truth command) correctly excludes all of these phantom entries, confirming the mismatch is isolated to the / picker's rendering/grouping logic, not the actual skill registry.

Affected version

GitHub Copilot CLI 1.0.93

Steps to reproduce the behavior

1. Install a plugin (from any marketplace) that bundles only MCP servers and no skills
2. In the interactive prompt, type / to open the command/skill picker
3. Scroll to that plugin's namespace group
4. Observe several skill-style entries listed under the plugin's namespace that have nothing to do with the plugin's declared purpose
5. Run copilot skill list and compare — none of these phantom entries appear there
6. Try invoking one of the phantom entries — it fails ("file not found") because no such skill file exists

Expected behavior

The / picker should only show skills that are actually bundled with and resolvable from the installed plugin (i.e., match what copilot skill list reports). Skill names should not be attributed to a plugin namespace they don't belong to, and no unresolvable/phantom entries should appear in the picker.

Additional context

• Operating system: Windows
• Terminal: Windows Terminal
• Confirmed via: copilot skill list, copilot plugin list, and inspecting the installed plugin's .github/plugin/plugin.json and on-disk cache (no skills/ folder present).