> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.signoffkit.com/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.signoffkit.com/_mcp/server.

# Getting started

> Install SignOff Kit or SignOff Kit Free for Claude Code, the Cursor desktop app, or Codex, activate your license, and start your first build.

SignOff Kit is built for Claude Code, Cursor, and Codex. The same installer sets up each one, so pick your agent below. Every download also includes a step-by-step walkthrough (`WALKTHROUGH.html`, with a plain-text `WALKTHROUGH.md` and a Windows version) that covers each step in more detail.

## What you need

* A Mac or Linux computer, or Windows through WSL (see [Windows](#windows) below).
* Claude Code, the Cursor desktop app, or Codex.
* Node 18 or later. The installer uses bash and python3, which macOS and Linux already have.
* For the paid Kit's audit step: `npm i -D playwright && npx playwright install chromium`.
* For deploys (paid Kit only, and only if you want one): your own Vercel account. The agent asks before deploying anything.

## 1. Unzip the Kit and make a project folder

Unzip `signoff-kit.zip` (paid) or `signoff-kit-free.zip` (free), then make a folder for your site and move into it:

```bash
mkdir -p ~/my-first-site
cd ~/my-first-site
```

## 2. Install for your agent

Run the installer from inside your project folder and pick your agent with a flag. In the paid Kit, activate your license in the same step with `SIGNOFF_LICENSE_KEY`, using the license key from your receipt email.

### Claude Code

```bash
SIGNOFF_LICENSE_KEY=YOUR-KEY ~/Downloads/signoff-kit/install.sh --claude
```

Skills go into `.claude/skills`, and a router note is added to `CLAUDE.md`.

### Cursor

```bash
SIGNOFF_LICENSE_KEY=YOUR-KEY ~/Downloads/signoff-kit/install.sh --cursor
```

Skills go into `.cursor/skills`, and an always-on rule is written to `.cursor/rules/signoff-kit.mdc`. `.cursor` starts with a dot, which makes it a hidden folder; Cursor's file tree shows it inside your project.

### Codex

```bash
SIGNOFF_LICENSE_KEY=YOUR-KEY ~/Downloads/signoff-kit/install.sh --codex
```

Skills go into `.agents/skills`, and a router note is added to `AGENTS.md`.

### SignOff Kit Free

The free installer needs no key. With no flag it sets up Claude Code, Cursor, and Codex together:

```bash
~/Downloads/signoff-kit-free/install.sh          # or --claude / --cursor / --codex
```

Running the installer again updates the skills and the `CLAUDE.md` / `AGENTS.md` note in place. The paid installer also accepts `--global` to install into `~/.claude/skills` and `~/.agents/skills`.

When it finishes, the installer prints the paths it wrote, a `license: activated on this machine (…)` line for the paid Kit, and a first prompt to try. See [License, activation and refunds](/account/license) for more on activation.

## 3. Start your agent in the project folder

### Claude Code

Install Claude Code, then start it in your project folder. You need a Claude Pro, Max, Team, Enterprise or Console account.

```bash
curl -fsSL https://claude.ai/install.sh | bash
cd ~/my-first-site
claude
```

### Cursor

Install the Cursor desktop app from [https://cursor.com/downloads](https://cursor.com/downloads), open it and sign in. Use the desktop app rather than Cursor on the web, because the web version runs in the cloud and can't see the folders on your computer. Then choose **File → Open Folder…**, pick `my-first-site`, and open the Agent chat.

### Codex

Install the Codex CLI, let its sandbox reach the internet (the photo and video steps need it), then start it in your project folder. The first time it runs, sign in with your ChatGPT account or an OpenAI API key.

```bash
curl -fsSL https://chatgpt.com/codex/install.sh | sh
mkdir -p ~/.codex && printf '\n[sandbox_workspace_write]\nnetwork_access = true\n' >> ~/.codex/config.toml
cd ~/my-first-site
codex
```

On a Mac you can use `brew install --cask codex` instead of the first line.

## 4. Kick off your first build

Ask your agent for a site in plain English:

```text
Use site-from-brief to build a one-page site for <your business>.
```

In SignOff Kit Free, ask for `site-from-brief-lite` instead. The agent asks its intake questions in one message (about 15 in the paid Kit, 8 in the free one; reply `skip` any time in the free version), writes `BRIEF.md` and `DESIGN.md`, and builds the site into `site/`. It finishes by pasting the [SignOff checks](/using-the-kit/checks) into its final message.

## Windows

Windows is supported through WSL (Windows Subsystem for Linux), which runs Ubuntu in a terminal window. You need Windows 11, or Windows 10 version 2004 or later. Install WSL from an administrator PowerShell window with `wsl --install`, restart, then install your agent and the Kit inside WSL. The Windows walkthrough in your download (`WALKTHROUGH-windows.html`) covers every step.