@thelacanians/cairntrace

by GitHub Actions · Browser Automation · MCP server

@thelacanians/cairntrace is an MCP server by GitHub Actions. Local-first browser testing for AI coding agents: write durable browser specs, replay them in a real browser, and get repair-ready evidence. Its npm package was downloaded 206 times last week.

Category: Browser Automation
Author: GitHub Actions
GitHub stars: Not on GitHub
This week: Tracking since 19 Oct 2026
Weekly downloads: 206
Language: JavaScript
License: MIT (open source)
Last update: 2026-10-14 (10 days ago)
Links: Source npm

mcp
mcp-server
claude-code
cursor
codex
e2e-testing
browser-testing
playwright
self-healing-tests
ai-agents
agent-browser

How to install @thelacanians/cairntrace

@thelacanians/cairntrace is published on npm as @thelacanians/cairntrace, and it depends on @modelcontextprotocol/sdk. These steps assume it runs as a local stdio server, which is the usual setup.

Check the README. Confirm the start command and note any API keys or environment variables it needs (pass them with -e KEY=value or an env block). You need Node.js for npx.

Add it to Claude Code from a terminal:

claude mcp add cairntrace -- npx -y @thelacanians/cairntrace

Or add it to Cursor or Claude Desktop in .cursor/mcp.json or claude_desktop_config.json:

{
  "mcpServers": {
    "cairntrace": {
      "command": "npx",
      "args": [
        "-y",
        "@thelacanians/cairntrace"
      ]
    }
  }
}

Restart the client and check it. Run claude mcp list, or open the client's MCP settings, and confirm @thelacanians/cairntrace and its tools are listed. The install guide covers VS Code and Codex.

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Maintain this project? Get it featured ($99/mo, pinned at the top of Browser Automation) or see what featuring includes.

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Frequently asked questions

What is @thelacanians/cairntrace?

@thelacanians/cairntrace is an MCP server by GitHub Actions in the Browser Automation category. Local-first browser testing for AI coding agents: write durable browser specs, replay them in a real browser, and get repair-ready evidence. Its npm package was downloaded 206 times last week. It is written in JavaScript. It is licensed under MIT. It was last updated 10 days ago.

Is @thelacanians/cairntrace free and open source?

Yes. @thelacanians/cairntrace is published under the MIT license, so you can run, modify and self-host it at no cost. If it connects to a paid service, that service's own pricing and API terms still apply. Check the repository for the exact license text before using it commercially.

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