cairn

v2.0.0

The referee for agent-led software development: reads the repository, names the next action.

CodexClaude Code3 Skills

By eas4aiLicense: UNLICENSED5 GitHub starsUpdated 3 days ago

Directory evidence

Runtimes: Codex and Claude Code
Parsed components: 3 skill or MCP entries
Source updated: Sep 20, 2026
Manifest status: Canonical path parsed

The directory validates manifest shape and source location. It does not execute the plugin or provide a security endorsement. Review the indexing methodology →

Install cairn for Codex and Claude Code

Installs for the current user

codex plugin marketplace add IchenDEV/agent-plugin-mkt
codex plugin marketplace upgrade agent-plugin-marketplace
codex plugin add cairn@agent-plugin-marketplace

Paste and run these commands in a terminal with Codex. They add and refresh the PluginsMP catalog, then install this plugin.

The installer fetches third-party code from the source repository shown on this page. This directory validates manifest structure and source location, but does not perform a security audit; review the manifest, components, and source before installing.

Get the source manually

$ git clone https://github.com/eas4ai/cairn

Clone the source repository, then follow its setup instructions to add the plugin to a compatible client. The repository root is the plugin root.

Plugin files

cairn/

├── .codex-plugin/plugin.json
├── .claude-plugin/plugin.json
├── skills/existing-project/SKILL.md
├── skills/install-cairn/SKILL.md
└── skills/next-feature/SKILL.md

Included Skills3

existing-projectskills/existing-project/SKILL.md

Bring an existing codebase under Cairn, reconcile a drifted spec, or resume a pending supersession. Reads the code before asking anything, writes a cited recon report, and prepares one commitment through the shared spec-phase tail. Observed is not Agreed.

install-cairnskills/install-cairn/SKILL.md

Make the cairn command available to this agent once, globally, and register the hooks the harness supports. Never initializes or changes a project. Use when cairn is missing, the link is broken, or the developer asks to set Cairn up.

next-featureskills/next-feature/SKILL.md

After a commitment is Done, take the waiting items or a new request, trace and cite each change's blast radius, revise or add Draft requirements with the developer, and run the shared spec-phase tail to the next start. Runs from Done only.

Plugin manifests2

.codex-plugin/plugin.json

{
  "name": "cairn",
  "version": "2.0.0",
  "description": "The referee for agent-led software development: reads the repository, names the next action.",
  "author": {
    "name": "eas4ai"
  },
  "license": "UNLICENSED",
  "keywords": [
    "agent",
    "specification",
    "requirements",
    "review",
    "hooks"
  ],
  "skills": "./skills/",
  "interface": {
    "displayName": "Cairn",
    "shortDescription": "The referee for agent-led software development",
    "longDescription": "Cairn reads the repository and names the agent's next action. The plugin carries the command, the four skills and the hooks that print the wake verdict; no hook blocks or writes.",
    "developerName": "eas4ai",
    "category": "Productivity"
  }
}

.claude-plugin/plugin.json

{
  "name": "cairn",
  "version": "2.0.0",
  "description": "The referee for agent-led software development: reads the repository, names the next action.",
  "author": {
    "name": "eas4ai"
  },
  "license": "UNLICENSED",
  "keywords": [
    "agent",
    "specification",
    "requirements",
    "review",
    "hooks"
  ]
}