What is mathcat?
mathcat is a Claude Code mod by johndpope that draw a formula and show the PNG in a pane. It is listed under Interface and has no public popularity data yet.
| Type | Claude code mod |
|---|---|
| Author | johndpope |
| Repository | johndpope/mathcat |
| Popularity | no public popularity data yet |
| Category | Interface |
| Security | Review before installing (72/100) |
| Rank | #3,601 of 5,272 Claude Code mods; #1,501 in Interface |
| Last commit | 2026-10-02 |
| Hooks | 5 events |
| Sees | classic hooks, mcp__mathcat__show calls |
| Draws on | Pane |
Is mathcat safe to install?
mathcat scores 72/100 on the MCPMods security check: Review before installing. Things to review: starts processes outside the sandbox; 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 processes outside the sandbox | Review |
| 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 |
|---|---|
$.clock.now | |
$.command.register | |
$.env.get | reads env vars |
$.fs.exists | reads files |
$.fs.read | reads files |
$.fs.stat | reads files |
$.process.run | runs processes |
$.store.get | keeps its own state |
$.store.set | keeps its own state |
$.tool.register | drives Claude |
$.ui.invalidate | draws interface |
$.ui.open | draws interface |
$.ui.resolve | draws interface |
How do I install mathcat?
- 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/johndpope/mathcat claude plugin validate ./mathcat/.
- Install it. Run this in your terminal, then /reload-plugins in an open session.
claude plugin marketplace add johndpope/mathcat && claude plugin install mathcat@mathcat
Or ask Claude to set it up
Paste this into Claude Code and it installs mathcat for you:
Install the "mathcat" Claude Code mod from https://github.com/johndpope/mathcat. Run claude plugin validate on it first and show me what it can access before you enable it.