Claude Code mod

cys

Tracks the temporary files Claude creates and asks it to clean them up at the end of each turn.

Workflow modsValidates on Claude Code 2.1.316 Source

Install

From source
git clone https://github.com/koenvdheide/cys.git
claude --plugin-dir ./cys/.

The repo has no marketplace file, so load the plugin folder directly with --plugin-dir.

What it can access

Reach
L2Writes or runs: drives Claude, reads files, persists state
Sees
classic hooks, mcp__cys__register calls
Hooks
session.startclassic.SubagentStarttool.callclassic.Stop

From a static scan of the mod's code by awesome-claude-code-mods. It shows what the code asks for, not a security review.

How Claude Code mods work

  • A mod is a plugin with a JavaScript or TypeScript module that runs inside Claude Code (version 2.1.287 or later). It can draw panes beside the transcript, a band above the prompt, buttons and toasts, restyle the spinner and tool rows, and watch or rewrite tool calls and prompts.
  • It installs like any plugin: add its marketplace with /plugin marketplace add owner/repo, then /plugin install name@marketplace.
  • Check what a mod can reach before installing: it runs with your permissions. Reach goes from drawing only, to reading files, to writing files or running processes, to the network. Run claude plugin validate on a clone to list its hooks and calls without running it.
  • Turn one off from the Installed tab in /plugin, or start Claude Code with --safe-mode to skip every customization for a session.
Claude Code docs

Details

Repository
koenvdheide/cys
Folder
.
Author
Koen van der Heide
Type
Workflow mods
License
MIT
Last updated
16 October 2026
Listed in
awesome-claude-code-mods

FAQ

What is cys?

Tracks the temporary files Claude creates and asks it to clean them up at the end of each turn. It is a mod for Claude Code, from koenvdheide/cys on GitHub.

What can the cys mod access?

Its widest reach is "writes or runs" (drives Claude, reads files, persists state). It sees classic hooks, mcp__cys__register calls. Like any mod, it runs with your permissions.

How do I install cys?

Clone koenvdheide/cys and start Claude Code with --plugin-dir pointing at the mod's folder (.).

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