[BUG] Plugin hooks.json: ${CLAUDE_PLUGIN_ROOT} not expanded on Windows

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: Windows 11, Claude Code (latest)

I am testing creating of plugins locally.

Problem:
When a local plugin's hooks.json references ${CLAUDE_PLUGIN_ROOT} for the
command path, the variable is not expanded on Windows. This causes a hook
error on every Bash tool call (PreToolUse:Bash).

hooks.json example:
"command": "${CLAUDE_PLUGIN_ROOT}/hooks/my_hook.py"

Expected: Path resolves to the plugin's installation directory
Actual: Literal string ${CLAUDE_PLUGIN_ROOT} is passed → file not found → hook error

Workaround: Deregister local plugins; copy hooks directly to ~/.claude/hooks/

What Should Happen?

Expected: Path resolves to the plugin's installation directory
Actual: Literal string ${CLAUDE_PLUGIN_ROOT} is passed → file not found → hook error

Error Messages/Logs

PreToolUse:Bash Hook error

Steps to Reproduce

Create a local plugin and try to register.
Then execute that plugin.

Claude Model

Opus

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.71

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_