cairn

v1.1.0

Write, check, test and tune CAIRN programs: the language skill, the cairn command on PATH, the language server, so every edit to a .cairn file comes back with the compiler's diagnostics, and an MCP server with the compiler's guarded edit, plan and implementation hosts.

Claude Code1 Skill1 MCP serverstdio

By SamMausbergLicense: MIT OR Apache-2.01 GitHub starsUpdated 1 hour ago

Directory evidence

Runtimes: Claude Code
Parsed components: 2 skill or MCP entries
Source updated: Sep 28, 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 Claude Code

Installs for the current user

claude plugin marketplace add IchenDEV/agent-plugin-mkt
claude plugin marketplace update agent-plugin-marketplace
claude plugin install cairn-2@agent-plugin-marketplace

Paste and run these commands in a terminal with Claude Code. 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/SamMausberg/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/

├── .claude-plugin/plugin.json
├── skills/cairn/SKILL.md
└── .mcp.json

Included Skills1

cairnskills/cairn/SKILL.md

Write, check, test and tune programs in CAIRN, a checked systems language that compiles to C++20 for the CPU and CUDA for NVIDIA GPUs. Use when a task involves .cairn files, a cairn.toml project or the cairn command, or asks for a CAIRN program. Gives the rules the compiler enforces (checked arithmetic, owners that move, second-class borrows, leases, race-free lanes, effect rows), the fix for each diagnostic code, and the check, test and run loop.

MCP servers1

cairnstdio

command: ${CLAUDE_PLUGIN_ROOT}/bin/cairn
args: mcp

Plugin manifests1

.claude-plugin/plugin.json

{
  "name": "cairn",
  "displayName": "CAIRN",
  "version": "1.1.0",
  "description": "Write, check, test and tune CAIRN programs: the language skill, the cairn command on PATH, the language server, so every edit to a .cairn file comes back with the compiler's diagnostics, and an MCP server with the compiler's guarded edit, plan and implementation hosts.",
  "author": {
    "name": "SamMausberg",
    "url": "https://github.com/SamMausberg"
  },
  "homepage": "https://github.com/SamMausberg/cairn",
  "repository": "https://github.com/SamMausberg/cairn",
  "license": "MIT OR Apache-2.0",
  "keywords": [
    "cairn",
    "language",
    "compiler",
    "systems",
    "cuda",
    "ownership",
    "effects"
  ],
  "lspServers": {
    "cairn": {
      "command": "${CLAUDE_PLUGIN_ROOT}/bin/cairn",
      "args": [
        "lsp"
      ],
      "extensionToLanguage": {
        ".cairn": "cairn"
      }
    }
  },
  "mcpServers": {
    "cairn": {
      "command": "${CLAUDE_PLUGIN_ROOT}/bin/cairn",
      "args": [
        "mcp"
      ]
    }
  },
  "experimental": {
    "evals": "bench/skill"
  }
}

For maintainers

If you maintain this plugin, link to this source-backed listing from your README so users can review its manifest and indexed components.

[cairn on Agent Plugins Marketplace](https://pluginsmp.com/plugins/cairn-2)