SessionStart hook fails on Windows: session-start.sh not found

[HYPERLYNQ]

Problem

On Windows, the session-start.sh hook fails every time Claude Code starts:

Hook SessionStart:startup (SessionStart) error:
/bin/bash: C:/Users/<user>/.claude/plugins/cache/claude-plugins-official/superpowers/4.3.0/hooks/session-start.sh: No such file or directory

Cause

Windows Claude Code uses Git Bash (C:\Program Files\Git\bin\bash.exe) to execute shell hooks. The ${CLAUDE_PLUGIN_ROOT} variable resolves to a Windows-style path (C:/Users/...), which /bin/bash (Git Bash) can't resolve when used as a script path.

The hooks.json uses:

"command": "${CLAUDE_PLUGIN_ROOT}/hooks/session-start.sh"

Environment

• Windows 11
• Claude Code v2.1.45
• Superpowers v4.3.0
• Git Bash as the shell executor

Impact

Shows SessionStart:startup hook error on every Claude startup on Windows. Cosmetic but confusing — users may think something is broken.

Possible fix

Either:

1. Add a session-start.cmd equivalent for Windows
2. Use run-hook.cmd (which already exists in the hooks directory) as the entry point on Windows
3. Convert the path to a Git Bash-compatible format (e.g., /c/Users/...)

[obra]

This should be resolved in v4.3.1, which restores the polyglot run-hook.cmd wrapper and renames session-start.sh to an extensionless session-start to avoid Claude Code's .sh auto-detection on Windows.

The wrapper now tries multiple Git Bash locations, falls back to PATH, and exits silently if no bash is found — so it should handle spaces in paths, missing WSL, MSYS edge cases, HCS sandbox routing, and backslash mangling.

Please reopen if v4.3.1 doesn't resolve this for you!