What is shell-shim?
shell-shim is a Claude Code mod by MichaelP17 that fixes the zsh pitfalls Claude's bash-style commands trip over — = words, unmatched globs, word splitting, aliases that hide programs, a missing timeout — before the command runs. It is listed under Interface and has 2 GitHub stars.
| Type | Claude code mod |
|---|---|
| Author | MichaelP17 |
| Repository | MichaelP17/claude-mods |
| Popularity | 2 GitHub stars |
| Category | Interface |
| Security | Review before installing (76/100) |
| Rank | #1,352 of 5,272 Claude Code mods; #532 in Interface |
| License | MIT |
| Last commit | 2026-10-16 |
| Hooks | 2 events |
| Sees | Bash calls |
| Draws on | nothing |
Is shell-shim safe to install?
shell-shim scores 76/100 on the MCPMods security check: Review before installing. Things to review: starts processes outside the sandbox; reads environment variables. It passed 6 of 8 checks.
Mod footprints come from claude plugin validate, which lists every event a mod hooks and every API call it makes without running it.
| Check | Result |
|---|---|
| No network access | Pass |
| Starts processes outside the sandbox | Review |
| Writes no files or config | Pass |
| Reads environment variables | Review |
| Only sees the events it hooks | Pass |
| Doesn't drive Claude | Pass |
| Passes claude plugin validate | Pass |
| Has an open-source license | Pass |
API calls in its code
| Call | What it means |
|---|---|
$.env.get | reads env vars |
$.fs.exists | reads files |
$.fs.list | reads files |
$.process.run | runs processes |
$.ui.log | draws interface |
How do I install shell-shim?
- Check your Claude Code version. Mods need Claude Code 2.1.287 or later and are on by default.
claude --version
- Read its footprint. This lists every event it hooks and every API call it makes, without running it.
git clone https://github.com/MichaelP17/claude-mods claude plugin validate ./claude-mods/shell-shim
- Install it. Run this in your terminal, then /reload-plugins in an open session.
git clone https://github.com/MichaelP17/claude-mods && claude --plugin-dir ./claude-mods/shell-shim
Or ask Claude to set it up
Paste this into Claude Code and it installs shell-shim for you:
Install the "shell-shim" Claude Code mod from https://github.com/MichaelP17/claude-mods/tree/main/shell-shim. Run claude plugin validate on it first and show me what it can access before you enable it.
More from MichaelP17/claude-mods
This repository has at least 9 Claude Code mods on MCPMods.
- cache-watch: Shows how long the prompt cache stays warm and suggests compacting a large context at the right moment (Low risk)
- compact-shaper: Summarizes compactions as a handoff, and cuts re-readable tool output instead on /compact prune (Low risk)
- concurrency-guard: Caps parallel subagents and monitors; more need a stated reason and the user's approval (Low risk)
- config-snapshots: Snapshot and roll back the Claude Code configuration through claude-config (Review before installing)
- grill-panel: Answers Claude's numbered question rounds one by one in a panel, keeps confirmed answers across restarts, and sends them (Low risk)
- idea-shell: Captures ideas per folder with /idea while Claude keeps working, and hands them to Claude later (Review before installing)
- machine-guard: Puts every command that changes the machine in front of the user before it runs (Low risk)
- mod-hub: One toolbox button in the desktop footer that shows what every mod reports and opens their panes, also while Claude is w (Low risk)