[BUG] Slash commands not working - "Unknown skill" error for all built-in commands

Preflight Checklist

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

What's Wrong?

Environment:

• Claude Code version: 2.1.11
• OS: macOS (Tahoe 26.2.0)
• Shell: zsh
• Installation method: npm

Steps to reproduce:

1. Start claude
2. Type /help and press enter
3. Observe error: Unknown skill: help

Expected behavior:
Built-in slash commands should execute normally and appear in autocomplete.

Actual behavior:
All slash commands show "Unknown skill: [command]" error.

Troubleshooting attempted:

• Full uninstall and reinstall of Claude Code
• Cleared ~/.claude/cache
• Removed ~/.claude/settings.local.json
• Removed ~/.mcp.json
• Completely deleted ~/.claude directory
• Tested in clean directory (/tmp)
• Downgraded to version 2.1.0
• Issue persists in all cases

What Should Happen?

Expected behavior:
Built-in slash commands should execute normally and appear in autocomplete.

Error Messages/Logs

All slash commands show "Unknown skill: [command]" error.

Steps to Reproduce

Steps to reproduce:

1. Start claude
2. Type /help and press enter
3. Observe error: Unknown skill: help

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

v2.1.11

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_