What is crew-chief?
crew-chief is a Claude Code mod by aykyusuf that difficulty-based routing for Claude Code. You pick the main model and effort; Claude decides what to do itself and what to hand to tiered Haiku, Sonnet, and Opus subagents (including. It is listed under Agents & automation and has 3 GitHub stars.
| Type | Claude code mod |
|---|---|
| Author | aykyusuf |
| Repository | aykyusuf/crew-chief |
| Popularity | 3 GitHub stars |
| Category | Agents & automation |
| Security | High risk (48/100) |
| Rank | #780 of 5,272 Claude Code mods; #72 in Agents & automation |
| License | MIT |
| Last commit | 2026-10-16 |
| Hooks | 11 events |
| Sees | /"^mcp__.+__crew_compact_checkpoint$"/ calls, classic hooks, compaction, every prompt |
| Draws on | nothing |
Is crew-chief safe to install?
crew-chief scores 48/100 on the MCPMods security check: High risk. Things to review: starts processes outside the sandbox; writes files or config; reads environment variables; watches every prompt or event. It passed 3 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 files or config | Review |
| Reads environment variables | Review |
| Watches every prompt or event | Review |
| Drives Claude (model calls, prompts) | Note |
| Passes claude plugin validate | Pass |
| Has an open-source license | Pass |
API calls in its code
| Call | What it means |
|---|---|
$.agent.list | |
$.clock.after | |
$.clock.now | |
$.clock.sleep | |
$.command.list | |
$.command.register | |
$.command.run | drives Claude |
$.env.get | reads env vars |
$.fs.exists | reads files |
$.fs.list | reads files |
$.fs.read | reads files |
$.fs.stat | reads files |
$.fs.write | writes files |
$.process.run | runs processes |
$.prompt.submit | drives Claude |
$.session.compact | drives Claude |
$.session.cwd | |
$.session.id | |
$.session.model |
How do I install crew-chief?
- 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/aykyusuf/crew-chief claude plugin validate ./crew-chief/.
- Install it. Run this in your terminal, then /reload-plugins in an open session.
claude plugin marketplace add aykyusuf/crew-chief && claude plugin install crew-chief@crew-chief
Or ask Claude to set it up
Paste this into Claude Code and it installs crew-chief for you:
Install the "crew-chief" Claude Code mod from https://github.com/aykyusuf/crew-chief. Run claude plugin validate on it first and show me what it can access before you enable it.