What is cache-meter?
cache-meter is a Claude Code mod by HolyGrail that gauges how long the conversation's prompt cache stays warm, its hit ratio and misses, and what the next message re-caches once it has gone cold. It is listed under Cost & usage and has 19 GitHub stars.
| Type | Claude code mod |
|---|---|
| Author | HolyGrail |
| Repository | HolyGrail/claude-mods |
| Popularity | 19 GitHub stars |
| Category | Cost & usage |
| Security | Low risk (84/100) |
| Rank | #335 of 5,272 Claude Code mods; #52 in Cost & usage |
| Last commit | 2026-10-12 |
| Stars this week | +2 |
| Hooks | 7 events |
| Sees | classic hooks |
| Draws on | AbovePrompt |
Is cache-meter safe to install?
cache-meter scores 84/100 on the MCPMods security check: Low risk. Things to review: 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 no processes | Pass |
| 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 |
| No license detected | Note |
API calls in its code
| Call | What it means |
|---|---|
$.agent.list | |
$.clock.after | |
$.clock.now | |
$.env.get | reads env vars |
$.session.authorize | reads the transcript |
$.session.usage | |
$.settings.read | reads settings |
$.ui.invalidate | draws interface |
$.ui.resolve | draws interface |
How do I install cache-meter?
- 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/HolyGrail/claude-mods claude plugin validate ./claude-mods/plugins/cache-meter
- Install it. Run this in your terminal, then /reload-plugins in an open session.
claude plugin marketplace add HolyGrail/claude-mods && claude plugin install cache-meter@claude-mods
Or ask Claude to set it up
Paste this into Claude Code and it installs cache-meter for you:
Install the "cache-meter" Claude Code mod from https://github.com/HolyGrail/claude-mods/tree/main/plugins/cache-meter. Run claude plugin validate on it first and show me what it can access before you enable it.
More from HolyGrail/claude-mods
This repository has 5 Claude Code mods on MCPMods.
- notice-board: Shares notices with every session in the same repository, or on the machine (Low risk)
- pr-relay: Watches the session's pull request and wakes the session when it is merged or Codex reviews it (High risk)
- usage-meter: Shows context, 5-hour, weekly and per-model weekly limit usage above the prompt (Low risk)
- zsh-safe: Lets Bash commands written for bash run under zsh: unmatched globs, leading =, and a missing timeout (Review before installing)