What is agent-usage-guard?
agent-usage-guard is a Claude Code mod by rbartoli that a Claude Code mod that holds subagent fan-out, heavy-context prompts and retry loops before they spend your usage window. It reads your plan's usage, counts agents across every session,. It is listed under Security and has 3 GitHub stars.
| Type | Claude code mod |
|---|---|
| Author | rbartoli |
| Repository | rbartoli/agent-usage-guard |
| Popularity | 3 GitHub stars |
| Category | Security |
| Security | Review before installing (72/100) |
| Rank | #956 of 5,272 Claude Code mods; #111 in Security |
| License | MIT |
| Last commit | 2026-10-11 |
| Hooks | 16 events |
| Sees | classic hooks, every prompt, every tool call, subagent spawns |
| Draws on | nothing |
Is agent-usage-guard safe to install?
agent-usage-guard scores 72/100 on the MCPMods security check: Review before installing. Things to review: reads environment variables; watches every prompt or event. It passed 5 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 no processes | Pass |
| Writes no files or config | Pass |
| 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 |
|---|---|
$.clock.after | |
$.clock.now | |
$.command.register | |
$.env.get | reads env vars |
$.prompt.fill | writes the prompt box |
$.prompt.read | |
$.prompt.submit | drives Claude |
$.session.compact | drives Claude |
$.session.id | |
$.session.usage | |
$.store.delete | keeps its own state |
$.store.get | keeps its own state |
$.store.keys | keeps its own state |
$.store.set | keeps its own state |
$.ui.ask | draws interface |
$.ui.log | draws interface |
$.ui.status | draws interface |
How do I install agent-usage-guard?
- 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/rbartoli/agent-usage-guard claude plugin validate ./agent-usage-guard/.
- Install it. Run this in your terminal, then /reload-plugins in an open session.
claude plugin marketplace add rbartoli/agent-usage-guard && claude plugin install agent-usage-guard@agent-usage-guard
Or ask Claude to set it up
Paste this into Claude Code and it installs agent-usage-guard for you:
Install the "agent-usage-guard" Claude Code mod from https://github.com/rbartoli/agent-usage-guard. Run claude plugin validate on it first and show me what it can access before you enable it.