What is playpen?
playpen is a Claude Code mod by KytioisaCat that the sessions you are working in right now as small cards above the prompt: a status lamp, a short label, what just happened, and one press to answer or jump there. It is listed under Interface and has no public popularity data yet.
| Type | Claude code mod |
|---|---|
| Author | KytioisaCat |
| Repository | KytioisaCat/playpen |
| Popularity | no public popularity data yet |
| Category | Interface |
| Security | High risk (36/100) |
| Rank | #3,762 of 5,272 Claude Code mods; #1,571 in Interface |
| License | MIT |
| Last commit | 2026-10-17 |
| Hooks | 16 events |
| Sees | AskUserQuestion calls, classic hooks, every prompt, every tool call, the system prompt |
| Draws on | AbovePrompt |
Is playpen safe to install?
playpen scores 36/100 on the MCPMods security check: High risk. Things to review: sends data over the network; starts processes outside the sandbox; writes files or config; reads environment variables; watches every prompt or event. It passed 2 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 |
|---|---|
| Sends data over the network | Review |
| 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 |
|---|---|
$.clock.after | |
$.clock.every | |
$.clock.now | |
$.command.register | |
$.env.get | reads env vars |
$.fs.exists | reads files |
$.fs.list | reads files |
$.fs.read | reads files |
$.fs.write | writes files |
$.mcp.call | calls MCP servers |
$.model.complete | drives Claude |
$.process.run | runs processes |
$.prompt.submit | drives Claude |
$.session.id | |
$.session.messages | reads the transcript |
$.session.model | |
$.store.get | keeps its own state |
$.turn.abort | drives Claude |
$.ui.copy | draws interface |
$.ui.invalidate | draws interface |
$.ui.log | draws interface |
$.ui.resolve | draws interface |
$.ui.toast | draws interface |
How do I install playpen?
- 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/KytioisaCat/playpen claude plugin validate ./playpen/.
- Install it. Run this in your terminal, then /reload-plugins in an open session.
claude plugin marketplace add KytioisaCat/playpen && claude plugin install playpen@kytioisacat
Or ask Claude to set it up
Paste this into Claude Code and it installs playpen for you:
Install the "playpen" Claude Code mod from https://github.com/KytioisaCat/playpen. Run claude plugin validate on it first and show me what it can access before you enable it.