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Install

Install Crosscheck from inside Claude Code

One command registers the MCP server, opens your browser to sign in and subscribe, and walks you through your provider keys — which never leave your machine.

choose your install

Two products, same engine.

Everyone runs the same orchestration engine and the same tools. What differs is how you sign in and where your keys are allowed to live.

Most people

Small Team / Single User

Sign in with Google, subscribe, and store provider keys wherever you like — a local file, your OS keychain, or 1Password. No admin, no org config.

Install with crosscheck-cli ↓

Orgs with SSO & provider requirements

Enterprise

Mandatory sign-in via your org’s Okta or Entra, keys stored in 1Password only, and an admin-managed allowlist of which providers your org can use.

Install with crosscheck-enterprise ↓

Small Team / Single User

New to GitHub, VS Code, or the terminal?

Start with the complete beginner guide — accounts, API keys, editor setup, and your first project, step by step. Open the Startup Guide →

✓ Recommended setup · Claude Code in VS Code

Install in one command

Paste this into the Claude Code chat — it’ll run it for you — or run it yourself in any terminal:

$npx -y crosscheck-cli@latest install

Tip: you can also just tell Claude Code run npx -y crosscheck-cli@latest install.

  • →Registers the crosscheck MCP server in Claude Code (user scope — every workspace).
  • →Opens your browser to sign in, accept the agreement, and subscribe.
  • →Sets up your provider keys (Anthropic, OpenAI, Google, xAI) — stored locally on your machine, never sent to us.
  • →Verifies with a first confer call.

Requires Node 20+. One more step after it finishes — see below.

Last step · turn it on

Activate crosscheck in Claude Code

The installer registers the server, but Claude Code only loads it after a restart:

  1. 1Quit Claude Code completely (press ⌘Q) and reopen it — or reload the window.
  2. 2In the chat, type /mcp.
  3. 3Find crosscheck in the list and click Enable (or Reconnect).

Then try it — ask Claude Code to use crosscheck to confer on <your question>. Something off? Run npx -y crosscheck-cli@latest doctor.

Requirements

  • Node.js 20 or newer — the installer runs on Node — check with node -v, or get it at nodejs.org
  • VS Code + the Claude Code extension — the recommended host; crosscheck also works in any MCP client or a plain terminal
  • A Google account — to sign in and tie the install to your seat
  • At least one provider API key — Anthropic, OpenAI, Google, or xAI — your keys, stored locally, never sent to us (note: xAI keys need credits/billing on your xAI account before they work)
  • A payment method — $20 / seat / month through Aug 2026 — first month free with code WELCOME100. See /pricing for current rates
  • macOS, Linux, or Windows — keys are saved in an encrypted file on your machine (no password); your OS keychain is an optional alternative

Prefer the browser?

One subscription also covers the Chrome extension — same panel, no second seat.

Browser extension

Crosscheck in your browser

Your same subscription works in a Chrome extension — ask the whole panel from any tab, with a compact popup that expands to a full workspace. Best for research, financial, and business work; not for heavy coding.

Add to Chrome →
  1. 1Add Crosscheck to Chrome from the Web Store.
  2. 2Open the extension → Account → Activate this browser. It uses the seat you already have — no second subscription.
  3. 3Add your provider keys in the extension — encrypted on your device, never sent to us.

Other ways to install

Any MCP client / terminal

The same installer works outside Claude Code — it prints the MCP config to add to your client if it can't self-register.

$npx -y crosscheck-cli@latest install

Prefer to set up billing in the browser first?

Sign in, accept the agreement, and subscribe on the web, then run the installer to activate your machine.

Sign in & subscribe →

Already subscribed? Open your dashboard to manage seats and machines.

Enterprise

Mandatory SSO, org-managed keys.

Crosscheck Enterprise is a separate install (crosscheck-enterprise instead of crosscheck-cli) built for orgs that need central control over sign-in and which model providers employees can use — without ever proxying an LLM call through us. Keys stay on each employee’s machine, in 1Password, exactly like the standard product — we just add a mandatory identity check and an admin-set allowlist on top.

Step 1 · org admin

Set up your org first

Before anyone on your team can activate, an admin registers your org’s domain, connects Okta or Entra, and picks which providers are allowed (e.g. turn off Kimi or Qwen). Talk to us first — an org has to be flagged enterprise before this page is reachable.

Open org settings →

Step 2 · every employee

Install once your org is configured

Same one-liner, different bin. Signs in via your org’s SSO instead of Google, and only ever offers to store keys in 1Password.

$npx -y crosscheck-enterprise@latest install
  • Sign-in via your org's Okta or Entra — no Google OAuth, no local password.
  • Keys live in 1Password only — no local file store, no OS keychain fallback.
  • Admin sets which providers are allowed; disallowed providers never show up in `keys setup`.
  • We never see or proxy an API key or an LLM call — enforcement is client-side, backed by seat revocation for a machine that goes non-compliant.

Not sure which install is right for your team? hello@crosscheckagent.com

install — crosscheck