Claude Code mod
shell-guard
Refuses Bash and PowerShell commands that break on Windows, installs az shims that skip cmd.exe, and adds Windows shell rules to the system prompt
Install
/plugin marketplace add wcampbell-dw/claude-plugins
/plugin install shell-guard@wcampbellMods install like plugins. Run /reload-plugins or start a new session to load it.
What it can access
- Reach
- L2Writes or runs: runs processes, writes files, reads files, reads env vars, persists state, draws
- Sees
- Bash calls, PowerShell calls
- Hooks
session.startcommand.runprompt.composetool.call
From a static scan of the mod's code by awesome-claude-code-mods. It shows what the code asks for, not a security review.
How Claude Code mods work
- A mod is a plugin with a JavaScript or TypeScript module that runs inside Claude Code (version 2.1.287 or later). It can draw panes beside the transcript, a band above the prompt, buttons and toasts, restyle the spinner and tool rows, and watch or rewrite tool calls and prompts.
- It installs like any plugin: add its marketplace with /plugin marketplace add owner/repo, then /plugin install name@marketplace.
- Check what a mod can reach before installing: it runs with your permissions. Reach goes from drawing only, to reading files, to writing files or running processes, to the network. Run claude plugin validate on a clone to list its hooks and calls without running it.
- Turn one off from the Installed tab in /plugin, or start Claude Code with --safe-mode to skip every customization for a session.
Details
- Repository
- wcampbell-dw/claude-plugins
- Folder
plugins/shell-guard- Marketplace
wcampbell- Author
- wcampbell
- License
- MIT-0
- Last updated
- 31 October 2026
- Listed in
- awesome-claude-code-mods
FAQ
What is shell-guard?
Refuses Bash and PowerShell commands that break on Windows, installs az shims that skip cmd.exe, and adds Windows shell rules to the system prompt It is a mod for Claude Code, from wcampbell-dw/claude-plugins on GitHub.
What can the shell-guard mod access?
Its widest reach is "writes or runs" (runs processes, writes files, reads files, reads env vars, persists state, draws). It sees Bash calls, PowerShell calls. Like any mod, it runs with your permissions.
How do I install shell-guard?
Inside Claude Code (v2.1.287 or later), run /plugin marketplace add wcampbell-dw/claude-plugins and then /plugin install shell-guard@wcampbell.
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