[BUG] Custom slash commands and plugins no longer appear in autocomplete

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?

This is a regression bug. This issue started again on my local version - v2.1.89
I downgraded the Claude Code version to v2.1.87, and it worked as expected.

Custom slash commands stored in .claude/commands/ (both top-level and in subdirectories like prime/, dev/) no longer appear in the autocomplete dropdown when typing / in the CLI input.

Previously, typing / would display all custom commands (e.g., /prime:frontend, /dev:backend-api, /deploy, etc.) alongside built-in commands. Now, only built-in commands appear in the autocomplete list.

What Should Happen?

All custom commands from .claude/commands/ should appear in the autocomplete dropdown when typing /, as they did in earlier versions

Error Messages/Logs

Steps to Reproduce

1. Create a .claude/commands/ directory in any project
2. Add a markdown file, e.g., .claude/commands/my-command.md with any content
3. Also test with subdirectories: .claude/commands/prime/frontend.md (should appear as /prime:frontend)
4. Launch Claude Code v2.1.89
5. Type / in the input
6. Observe that custom commands are missing from the autocomplete dropdown

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.87

Claude Code Version

2.1.89

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_