[BUG] /plugin slash commands show skill as installed but skill cannot be invoked

[FrankLedo]

Preflight Checklist

• I have searched existing issues and this hasn't been reported yet
• This is a single bug report (please file separate reports for different bugs)
• I am using the latest version of Claude Code

What's Wrong?

Using /plugin marketplace add and /plugin install inside a Claude Code session reports success and the skill appears as installed in settings, but attempting to invoke the skill returns "skill not found".

What Should Happen?

Skills installed via the /plugin slash commands should be invokable in the same way as skills installed via the claude plugin CLI commands.

Steps to Reproduce

1. In a Claude Code session, run /plugin marketplace add FrankLedo/claude-skills
2. Run /plugin install slack-monitor
3. Observe success message and skill appearing in settings
4. Attempt to invoke the skill with /slack-monitor
5. Observe "skill not found" error

Workaround: Installing via the CLI works correctly:

claude plugin marketplace add FrankLedo/claude-skills
claude plugin install slack-monitor

Error Messages/Logs

skill not found

Claude Code Version

Latest

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

zsh

Additional Information

No response

[github-actions]

Found 3 possible duplicate issues:

1. Skills from marketplace plugins don't appear in slash command autocomplete #18949
2. Slash commands for plugin skills return 'Unknown skill' with custom CLAUDE_CONFIG_DIR #34144
3. Plugin installer: wrong extraction path + infinite recursive nesting for marketplace plugins using plugins/ subdirectory #35507

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🤖 Generated with Claude Code

[FrankLedo]

May be a duplicate of #18949 and #17271

[github-actions]

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.