What is prompt-cache-control?
prompt-cache-control is a Claude Code mod by jakerains that prompt-cache meter above the Claude Code prompt: how many tokens each request read from, wrote to and sent past the cache, a live countdown to the cache's expiry, and what to do about it. It is listed under Cost & usage and has no public popularity data yet.
| Type | Claude code mod |
|---|---|
| Author | jakerains |
| Repository | jakerains/claudemods |
| Popularity | no public popularity data yet |
| Category | Cost & usage |
| Security | Low risk (84/100) |
| Rank | #3,506 of 5,272 Claude Code mods; #648 in Cost & usage |
| License | MIT |
| Last commit | 2026-10-11 |
| Hooks | 7 events |
| Sees | only the events it hooks |
| Draws on | AbovePrompt, Pane |
Is prompt-cache-control safe to install?
prompt-cache-control 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 |
| Validator reported problems | Note |
| Has an open-source license | Pass |
API calls in its code
| Call | What it means |
|---|---|
$.clock.every | |
$.command.register | |
$.env.get | reads env vars |
$.fs.read | reads files |
$.session.cwd | |
$.session.usage | |
$.state.get | |
$.state.set | |
$.store.get | keeps its own state |
$.store.set | keeps its own state |
$.ui.close | draws interface |
$.ui.invalidate | draws interface |
$.ui.log | draws interface |
$.ui.open | draws interface |
$.ui.resolve | draws interface |
$.ui.status | draws interface |
$.ui.toast | draws interface |
How do I install prompt-cache-control?
- 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/jakerains/claudemods claude plugin validate ./claudemods/prompt-cache-control
- Install it. Run this in your terminal, then /reload-plugins in an open session.
claude plugin marketplace add jakerains/claudemods && claude plugin install prompt-cache-control@claudemods
Or ask Claude to set it up
Paste this into Claude Code and it installs prompt-cache-control for you:
Install the "prompt-cache-control" Claude Code mod from https://github.com/jakerains/claudemods/tree/main/prompt-cache-control. Run claude plugin validate on it first and show me what it can access before you enable it.
More from jakerains/claudemods
This repository has 3 Claude Code mods on MCPMods.
- context-gauge: One line under the prompt: model, effort, repo/branch, context left, and on a Claude subscription the 5-hour and weekly (Low risk)
- open-tray: POWERTRAY: a pane of things to look at or listen to (what Claude made this session, things related to what you are on, l (High risk)