Claude Code mod
cairn
Milestone-driven development workflow and tracking system for Claude Code projects: a language-agnostic core with per-repo toolchain profiles (R, Python, Claude Code plugin, Quarto extension, Docker image, or generic), plan/implement/review skills, hotfix and release paths, Fable review briefs, and a self-auditing cairn/ file system.
Install
/plugin marketplace add jmgirard/cairn
/plugin install cairn@cairnMods install like plugins. Run /reload-plugins or start a new session to load it.
What it can access
- Reach
- L2Writes or runs: runs processes, drives Claude, writes the prompt box, reads files, reads mod state, persists state, draws
- Sees
- classic hooks, every prompt, every skill, Edit calls, Write calls, MultiEdit calls
- Draws in
PaneAbovePrompt- Hooks
session.startclassic.SessionStartcommand.runui.renderturn.completeclassic.Stopprompt.submitskill.prompttool.callsession.end
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.
Details
- Repository
- jmgirard/cairn
- Folder
.- Marketplace
cairn- Author
- Jeffrey Girard
- License
- MIT
- Last updated
- 31 October 2026
- Listed in
- awesome-claude-code-mods
FAQ
What is cairn?
Milestone-driven development workflow and tracking system for Claude Code projects: a language-agnostic core with per-repo toolchain profiles (R, Python, Claude Code plugin, Quarto extension, Docker image, or generic), plan/implement/review skills, hotfix and release paths, Fable review briefs, and a self-auditing cairn/ file system. It is a mod for Claude Code, from jmgirard/cairn on GitHub.
What can the cairn mod access?
Its widest reach is "writes or runs" (runs processes, drives Claude, writes the prompt box, reads files, reads mod state, persists state, draws). It sees classic hooks, every prompt, every skill, Edit calls, Write calls, MultiEdit calls. It draws in Pane, AbovePrompt. Like any mod, it runs with your permissions.
How do I install cairn?
Inside Claude Code (v2.1.287 or later), run /plugin marketplace add jmgirard/cairn and then /plugin install cairn@cairn.
Is cairn popular?
jmgirard/cairn has 4 GitHub stars and 0 forks, and is included in 1 curated Claude Code list. It was last updated on 31 October 2026.
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