Windows: Plugin hooks fail due to path escaping - backslashes stripped from CLAUDE_PLUGIN_ROOT

Bug Report: Windows path escaping broken in plugin hooks

Summary

On Windows, plugin hooks that use ${CLAUDE_PLUGIN_ROOT} with shell scripts (.sh) fail because Windows paths lose their backslashes, resulting in invalid paths like C:Usersdkohut... instead of C:\Users\dkohut\... or /c/Users/dkohut/....

Environment

• Claude Code version: 2.1.31
• Platform: Windows 11 (win32)
• Bash: Git Bash (C:\Program Files\Git\bin\bash.exe)
• Affected plugins:
• superpowers@claude-plugins-official (v4.1.1)
• explanatory-output-style@claude-plugins-official (27d2b86d72da)

Steps to Reproduce

1. Install Claude Code 2.1.31 on Windows
2. Enable superpowers or explanatory-output-style plugin
3. Start Claude Code with debug mode (--debug)
4. Observe startup hook errors

Expected Behavior

The ${CLAUDE_PLUGIN_ROOT} variable should expand to a valid path that bash can understand on Windows, either:

• Unix-style path: /c/Users/dkohut/.claude/plugins/cache/...
• Or properly escaped Windows path

Actual Behavior

The path loses all backslashes and becomes invalid:

/bin/bash: C:Usersdkohut.claudepluginscacheclaude-plugins-officialsuperpowers4.1.1/hooks/session-start.sh: No such file or directory

The path C:Usersdkohut... has:

• C: without following backslash
• All directory separators stripped

Debug Log Evidence

2026-02-05T08:22:08.286Z [DEBUG] Hook output does not start with {, treating as plain text
2026-02-05T08:22:08.287Z [DEBUG] Hook SessionStart:startup (SessionStart) error:
wsl: Neznámá klávesa 'experimental.useWindowsDnsCache' v C:\Users\dkohut\.wslconfig:33
wsl: Nastavení wsl2.localhostForwarding nemá žádný vliv při použití zrcadleného síťového režimu
/bin/bash: C:Usersdkohut.claudepluginscacheclaude-plugins-officialsuperpowers4.1.1/hooks/session-start.sh: No such file or directory

2026-02-05T08:22:08.301Z [DEBUG] Hook output does not start with {, treating as plain text
2026-02-05T08:22:08.302Z [DEBUG] Hook SessionStart:startup (SessionStart) error:
/bin/bash: C:Usersdkohut.claudepluginscacheclaude-plugins-officialexplanatory-output-style27d2b86d72da/hooks-handlers/session-start.sh: No such file or directory

Hook Configuration

Both plugins use standard hook configuration with ${CLAUDE_PLUGIN_ROOT}:

superpowers/hooks/hooks.json:

{
  "hooks": {
    "SessionStart": [
      {
        "matcher": "startup|resume|clear|compact",
        "hooks": [
          {
            "type": "command",
            "command": "${CLAUDE_PLUGIN_ROOT}/hooks/session-start.sh"
          }
        ]
      }
    ]
  }
}

Additional Context

The run-hook.cmd file in superpowers mentions that Claude Code 2.1.x changed execution model:

Claude Code 2.1.x changed the Windows execution model for hooks: After (2.1.x): Claude Code now auto-detects .sh files in hook commands and prepends "bash " on Windows.

The auto-detection works (bash is invoked), but the path passed to bash is malformed.

Suggested Fix

When expanding ${CLAUDE_PLUGIN_ROOT} on Windows for bash execution, the path should be converted to Unix-style format:

• C:\Users\dkohut\.claude\... → /c/Users/dkohut/.claude/...

Or ensure proper escaping when the path contains backslashes.

Workaround

Disable affected plugins:

{
  "enabledPlugins": {
    "superpowers@claude-plugins-official": false,
    "explanatory-output-style@claude-plugins-official": false
  }
}