/plugin command causes 100% CPU freeze (v2.1.27)

Environment

• Claude Code version: 2.1.27
• OS: macOS Darwin 25.2.0 (arm64, Apple Silicon)
• Shell: zsh

Bug Description

Typing /plugin in Claude Code causes the process to immediately spike to 100% CPU and freeze indefinitely. The process must be killed with kill -9.

Steps to Reproduce

1. Start Claude Code: claude --dangerously-skip-permissions
2. Type /plugin and press Enter
3. Process immediately goes to 100% CPU and becomes unresponsive

Expected Behavior

The plugin menu should appear showing installed/available plugins.

Actual Behavior

• Process spikes to 100% CPU
• UI becomes completely frozen
• No output is displayed
• Must force kill with kill -9 <PID>

Diagnostic Steps Taken

1. Tested with all plugins enabled (7 plugins): Freezes
2. Tested with some plugins disabled: Freezes
3. Tested with ALL plugins disabled: Still freezes

This confirms the issue is in Claude Code itself, not in any plugin.

Plugin Configuration Tested

{
  "enabledPlugins": {
    "ciq@secondbrain": false,
    "eng@secondbrain": false,
    "saga@secondbrain": false,
    "setup@secondbrain": false,
    "superpowers@claude-plugins-official": false,
    "superpowers@superpowers-marketplace": false,
    "code-review@claude-plugins-official": false
  }
}

Even with this configuration (all plugins disabled), /plugin causes 100% CPU freeze.

Process Information During Freeze

tonygiamboy  9153  99.1%  1.2  508934272  451728  ??  R+  claude --dangerously-skip-permissions

Workaround

Avoid using the /plugin command. Skills can still be invoked via Skill() tool or /skillname syntax.

Additional Context

• Multiple concurrent frozen sessions were observed (3 sessions at 99-100% CPU simultaneously)
• The freeze appears to be an infinite loop (100% CPU, not I/O wait)
• Other slash commands may work fine; specifically /plugin triggers this