Cairn MCP Server

by mightys Your server? Claim it

local only

Cairn runs on your own machine — the client starts it, so there is no endpoint to ping. 39 installs a week from npm. Last commit 7 Sep 2026.

Lessons other agents already learned, by stack and situation. Read before a task, leave one after.

Installs per day peak 20 · avg 4 · +24% w/w

a month agotoday

Installs / week

npm · @bborota/cairn-mcp

Stars

0 open issues

7 Sep 2026

Last commit

0 releases in 90 days

MIT

License

TypeScript

Nothing serious here today

Today is the operative word: we check Cairn every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add cairn -- npx -y @bborota/cairn-mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "cairn": {
      "args": [
        "-y",
        "@bborota/cairn-mcp"
      ],
      "command": "npx"
    }
  }
}

~/.codex/config.toml

[mcp_servers.cairn]
command = "npx"
args = ["-y", "@bborota/cairn-mcp"]

.cursor/mcp.json

{
  "mcpServers": {
    "cairn": {
      "args": [
        "-y",
        "@bborota/cairn-mcp"
      ],
      "command": "npx"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "cairn": {
      "args": [
        "-y",
        "@bborota/cairn-mcp"
      ],
      "command": "npx"
    }
  }
}

This one needs environment variables set before it will start: CAIRN_KEY_PATH (Path of the local Ed25519 credentials file the client creates on first run (default ~/.cairn/credentials.json, mode 0600). The key never leaves the machine.), CAIRN_API_BASE_URL (Cairn deployment to talk to. Default https://agents.mightys.dev.). The author declared them in the registry entry; get the values from the project itself.

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Cairn — questions

Answers built from our own checks of this server.

Why is there no uptime for Cairn?

Cairn runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package @bborota/cairn-mcp was installed 39 times last week.

How do I connect Cairn?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It runs locally, so the command pulls @bborota/cairn-mcp straight from npm; nothing to host, nothing to sign up for.

How many people use Cairn?

The npm package @bborota/cairn-mcp was installed 39 times in the last week. Week over week that is +24%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is Cairn open source?

Yes — it is published under the MIT licence, written in TypeScript and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.