What is cache-warmer?
cache-warmer is a Claude Code mod by paulbkim-dev that keep the main conversation's prompt cache warm by automatically forking its last request, tools denied and billed like any request, shortly before the cache expires; switch its lifetime. It is listed under Cost & usage and has 14 GitHub stars.
| Type | Claude code mod |
|---|---|
| Author | paulbkim-dev |
| Repository | paulbkim-dev/claude-code-cache-warmer |
| Popularity | 14 GitHub stars |
| Category | Cost & usage |
| Security | Review before installing (72/100) |
| Rank | #370 of 5,272 Claude Code mods; #59 in Cost & usage |
| License | MIT |
| Last commit | 2026-10-11 |
| Stars this week | +1 |
| Hooks | 13 events |
| Sees | classic hooks, compaction |
| Draws on | AbovePrompt, Pane |
Is cache-warmer safe to install?
cache-warmer scores 72/100 on the MCPMods security check: Review before installing. Things to review: writes files or config; reads environment variables. 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 files or config | Review |
| Reads environment variables | Review |
| Only sees the events it hooks | Pass |
| 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.every | |
$.clock.now | |
$.command.register | |
$.config.list | |
$.config.set | changes config |
$.env.get | reads env vars |
$.env.set | sets env vars |
$.fs.exists | reads files |
$.fs.read | reads files |
$.fs.write | writes files |
$.model.fork | drives Claude |
$.session.append | |
$.session.id | |
$.state.get | |
$.state.set | |
$.store.get | keeps its own state |
$.store.set | keeps its own state |
$.ui.blit | draws interface |
$.ui.close | draws interface |
$.ui.focus | draws interface |
$.ui.log | draws interface |
$.ui.open | draws interface |
$.ui.panes | draws interface |
$.ui.resolve | draws interface |
How do I install cache-warmer?
- 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/paulbkim-dev/claude-code-cache-warmer claude plugin validate ./claude-code-cache-warmer/.
- Install it. Run this in your terminal, then /reload-plugins in an open session.
claude plugin marketplace add paulbkim-dev/claude-code-cache-warmer && claude plugin install cache-warmer@claude-code-cache-warmer
Or ask Claude to set it up
Paste this into Claude Code and it installs cache-warmer for you:
Install the "cache-warmer" Claude Code mod from https://github.com/paulbkim-dev/claude-code-cache-warmer. Run claude plugin validate on it first and show me what it can access before you enable it.