Claude Code mod

calc

/calc evaluates arithmetic with parentheses and decimals, and says what is wrong with a bad expression

1 starsWorkflow mods Plugin marketplaceValidates on Claude Code 2.1.316 Source

Install

Inside Claude Code
/plugin marketplace add MatheusChiodi/cockpit
/plugin install calc@cockpit

Mods install like plugins. Run /reload-plugins or start a new session to load it.

What it can access

Reach
L1Reads: writes the clipboard, reads the selection, reads mod state
Hooks
session.startcommand.run

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/calc
Marketplace
cockpit
Author
Matheus Chiodi
Type
Workflow mods
License
MIT
Last updated
18 October 2026
Listed in
awesome-claude-code-mods

FAQ

What is calc?

/calc evaluates arithmetic with parentheses and decimals, and says what is wrong with a bad expression It is a mod for Claude Code, from MatheusChiodi/cockpit on GitHub.

What can the calc mod access?

Its widest reach is "reads" (writes the clipboard, reads the selection, reads mod state). Like any mod, it runs with your permissions.

How do I install calc?

Inside Claude Code (v2.1.287 or later), run /plugin marketplace add MatheusChiodi/cockpit and then /plugin install calc@cockpit.

Is calc 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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