Claude Code mod

mutable-default-note

Tells Claude when an edit gives a Python function a mutable default such as [], {} or set()

1 starsMemory & instructions modsValidates on Claude Code 2.1.316 Source

Install

From source
git clone https://github.com/MatheusChiodi/cockpit.git
claude --plugin-dir ./cockpit/mods/mutable-default-note

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

What it can access

Reach
L1Reads: reads files, reads mod state, draws
Sees
Write calls, Edit calls
Hooks
tool.call

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
MatheusChiodi/cockpit
Folder
mods/mutable-default-note
Author
Matheus Chiodi
Type
Memory & instructions mods
License
MIT
Last updated
18 October 2026
Listed in
awesome-claude-code-mods

FAQ

What is mutable-default-note?

Tells Claude when an edit gives a Python function a mutable default such as [], {} or set() It is a mod for Claude Code, from MatheusChiodi/cockpit on GitHub.

What can the mutable-default-note mod access?

Its widest reach is "reads" (reads files, reads mod state, draws). It sees Write calls, Edit calls. Like any mod, it runs with your permissions.

How do I install mutable-default-note?

Clone MatheusChiodi/cockpit and start Claude Code with --plugin-dir pointing at the mod's folder (mods/mutable-default-note).

Is mutable-default-note popular?

MatheusChiodi/cockpit has 1 GitHub stars and 0 forks, and is included in 1 curated Claude Code list. It was last updated on 18 October 2026.

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