What is companion?
companion is a Claude Code mod by MaryCache that a Claude Code companion: a Markdown kanban board pane (/board), a "please look" queue, a mood sprite, and rate-limit usage bars. It is listed under Cost & usage and has 1 GitHub stars.
| Type | Claude code mod |
|---|---|
| Author | MaryCache |
| Repository | MaryCache/claude-code-companion-mod |
| Popularity | 1 GitHub stars |
| Category | Cost & usage |
| Security | High risk (48/100) |
| Rank | #1,962 of 5,272 Claude Code mods; #344 in Cost & usage |
| Last commit | 2026-10-04 |
| Stars this week | +1 |
| Hooks | 8 events |
| Sees | ? calls, every prompt, every skill, every tool call |
| Draws on | Pane, AbovePrompt |
Is companion safe to install?
companion scores 48/100 on the MCPMods security check: High risk. Things to review: starts processes outside the sandbox; writes files or config; reads environment variables; watches every prompt or event. It passed 3 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 files or config | Review |
| Reads environment variables | Review |
| Watches every prompt or event | Review |
| Doesn't drive Claude | Pass |
| Passes claude plugin validate | Pass |
| No license detected | Note |
API calls in its code
| Call | What it means |
|---|---|
$.clock.every | |
$.clock.now | |
$.command.register | |
$.env.get | reads env vars |
$.fs.exists | reads files |
$.fs.read | reads files |
$.fs.stat | reads files |
$.fs.write | writes files |
$.process.run | runs processes |
$.session.cwd | |
$.session.messages | reads the transcript |
$.session.usage | |
$.state.get | |
$.state.set | |
$.tool.register | drives Claude |
$.ui.copy | draws interface |
$.ui.open | draws interface |
$.ui.resolve | draws interface |
$.ui.toast | draws interface |
How do I install companion?
- 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/MaryCache/claude-code-companion-mod claude plugin validate ./claude-code-companion-mod/plugins/companion
- Install it. Run this in your terminal, then /reload-plugins in an open session.
claude plugin marketplace add MaryCache/claude-code-companion-mod && claude plugin install companion@claude-code-companion-mod
Or ask Claude to set it up
Paste this into Claude Code and it installs companion for you:
Install the "companion" Claude Code mod from https://github.com/MaryCache/claude-code-companion-mod/tree/main/plugins/companion. Run claude plugin validate on it first and show me what it can access before you enable it.