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The Crosscheck Startup Guide takes you from a blank computer to your first AI-powered project — with four AIs working together inside your editor. Written for complete beginners. No terminal, GitHub, or coding experience needed.

Download the guide (PDF) →or read it in your browser

~45–60 minutes · you can pause anytime · 8 pages

What you'll need

GitHub account
free — stores your code in the cloud
Claude subscription
powers Claude Code inside your editor
4 API keys
Anthropic, OpenAI (GPT), Google (Gemini), xAI (Grok)
VS Code + GitHub Desktop
your editor and the app that moves code

What's inside

  1. 0Three words to knowAPI key, MCP server, CLAUDE.md — in plain English.
  2. 1Accounts & keysCreate every account and grab your four API keys, back-to-back.
  3. 2Install your toolsVS Code, GitHub Desktop, and the Claude Code extension.
  4. 3First project + early winClone a one-page site and see it live on your screen.
  5. 4Install CrosscheckOne command, add your keys, then reconnect the MCP server.
  6. 5Use it & save your workConfer/debate/audit across four AIs, then push to GitHub.
  7. 6Add a CLAUDE.mdTeach Claude your standards once — it reads them every time.

Already set up?

Install Crosscheck in one line, then reconnect the MCP server in Claude Code:

npx -y crosscheck-cli@latest install     # install
crosscheck keys setup                     # add your AI keys
/mcp  →  reconnect "crosscheck"           # turn it on, in Claude Code

Need to swap an expired or rotated key? Run crosscheck keys — a browser page opens where you can view, replace, or remove any key, applied right on your machine.

Full command reference →