# Hallmark Development Setup: A Complete Guide to Building AI-Assisted Design Skills

> Learn how to set up Hallmark for development with this guide. Clone the repo, install Node.js, and run npm run serve to build AI-assisted design skills.

- Repository: [Hassan El Mghari/hallmark](https://github.com/Nutlope/hallmark)
- Tags: getting-started
- Published: 2026-08-03

---

**To set up Hallmark for development, clone the repository, optionally install Node.js for the preview server, and run `npm run serve` to view the static demo site locally.**

Hallmark is a self-contained design skill for Claude Code, Cursor, and Codex developed by Nutlope. The entire setup process requires **zero runtime dependencies**—only a modern Node.js environment (≥14) if you want the convenience of the built-in preview server. This guide walks through the complete Hallmark development setup, from initial clone to validation and distribution.

## Understanding the Hallmark Repository Structure

Before diving into setup commands, it helps to understand how the repository is organized. Hallmark consists of three distinct sections:

| Section | Purpose | Key Files |
|---|---|---|
| **Skill definition** | Core skill manifest and design references loaded by AI assistants | [`skills/hallmark/SKILL.md`](https://github.com/Nutlope/hallmark/blob/main/skills/hallmark/SKILL.md) (entry point), `skills/hallmark/references/` (design assets) |
| **Static demo site** | Browsable showcase of generated pages and test fixtures | [`site/index.html`](https://github.com/Nutlope/hallmark/blob/main/site/index.html), `site/_tests/` (test pages) |
| **Package metadata** | Skill installation metadata and convenience scripts | [`package.json`](https://github.com/Nutlope/hallmark/blob/main/package.json) (declares entry point and `serve` script) |

All design logic lives in markdown and static assets. The skill is consumed directly from the file system—no build step, no compilation, no secret configuration.

## Step-by-Step Hallmark Development Setup

### 1. Clone the Repository

Start by obtaining a local copy of the source code:

```bash
git clone https://github.com/Nutlope/hallmark.git
cd hallmark

```

### 2. Optional: Install Node.js Dependencies

Node.js is **only required** for the `npm run serve` convenience script. The skill itself functions without any npm packages:

```bash
npm install

```

This creates a [`package-lock.json`](https://github.com/Nutlope/hallmark/blob/main/package-lock.json) for the serve script. If you skip this step, you can still use any static file server (see alternatives below).

### 3. Start the Local Preview Server

Run the built-in development server to browse the demo site:

```bash
npm run serve

# → Serves site/ folder at http://localhost:4173

```

This script is defined in [`package.json`](https://github.com/Nutlope/hallmark/blob/main/package.json) and provides instant feedback as you edit skill files.

**Alternative without Node.js:**

```bash
python3 -m http.server --directory site 4173

```

Both approaches serve the `site/` directory for browser-based validation.

### 4. Edit the Skill Definition

The development workflow centers on two locations:

- **[`skills/hallmark/SKILL.md`](https://github.com/Nutlope/hallmark/blob/main/skills/hallmark/SKILL.md)** — The main skill manifest read by Claude Code, Cursor, and Codex
- **`skills/hallmark/references/`** — The complete design library including macrostructures, color palettes, copy guidelines, and component cookbooks

Modify these files to change how AI assistants interpret and apply Hallmark's design language.

### 5. Validate Changes in the Browser

After editing, verify your changes by opening the corresponding example page:

```bash

# Example: view the "Cobalt" theme after modifications

open http://localhost:4173/examples/cobalt-01/

```

For systematic validation, check the built-in tests under `site/_tests/` which verify skill output against slop-test gates.

### 6. Distribute the Updated Skill

Once satisfied with your changes, deploy the skill using either method:

- **Registry method:** `npx skills add nutlope/hallmark`
- **Direct copy method:** Copy [`SKILL.md`](https://github.com/Nutlope/hallmark/blob/main/SKILL.md) plus the `references/` folder into your target AI assistant's skill directory

The direct copy method is preferred during active development for rapid iteration.

## Key Files for Hallmark Development

| File | Role | Location |
|------|------|----------|
| [`package.json`](https://github.com/Nutlope/hallmark/blob/main/package.json) | Declares skill entry point and `serve` script | Repository root |
| [`skills/hallmark/SKILL.md`](https://github.com/Nutlope/hallmark/blob/main/skills/hallmark/SKILL.md) | Main skill manifest consumed by AI assistants | `skills/hallmark/` |
| `skills/hallmark/references/` | Complete design library (macrostructures, themes, copy, components) | `skills/hallmark/references/` |
| `site/_tests/` | Test fixtures for validation | `site/_tests/` |
| [`site/index.html`](https://github.com/Nutlope/hallmark/blob/main/site/index.html) | Demo site landing and navigation | `site/` |
| [`site/js/main.js`](https://github.com/Nutlope/hallmark/blob/main/site/js/main.js) | Minimal client-side interactivity | `site/js/` |

## Environment Requirements

- **Node.js:** ≥14 (optional, only for `npm run serve`)
- **No API keys, environment variables, or external services required**
- **Pure file-level operations** throughout the entire workflow

## Summary

- **Hallmark development setup requires only a git clone and optional Node.js installation**—no complex toolchain or dependencies
- The repository structure separates skill definition (`skills/hallmark/`), demo site (`site/`), and metadata ([`package.json`](https://github.com/Nutlope/hallmark/blob/main/package.json)) for clear organization
- Run `npm run serve` (or Python's built-in server) to preview changes locally at `localhost:4173`
- Edit [`SKILL.md`](https://github.com/Nutlope/hallmark/blob/main/SKILL.md) and `references/` files to modify design behavior; validate via browser examples and `site/_tests/`
- Deploy using `npx skills add` or direct file copy—no build process required

## Frequently Asked Questions

### Does Hallmark require Node.js to function as a skill?

No. According to the Nutlope/hallmark source code, the skill itself has **zero runtime dependencies**. Node.js ≥14 is only needed if you want to use the `npm run serve` convenience script for local preview. The AI assistants consume [`SKILL.md`](https://github.com/Nutlope/hallmark/blob/main/SKILL.md) and the `references/` folder directly from the file system without any npm packages.

### Where is the main skill entry point located?

The primary skill manifest is at [`skills/hallmark/SKILL.md`](https://github.com/Nutlope/hallmark/blob/main/skills/hallmark/SKILL.md). This file is read by Claude Code, Cursor, and Codex when the skill is loaded. All design references are organized under `skills/hallmark/references/` including macrostructures, color palettes, and component documentation.

### How do I test specific design changes in Hallmark?

After editing skill files, start the preview server with `npm run serve` and navigate to the corresponding example page. For instance, changes to the Cobalt theme can be viewed at `http://localhost:4173/examples/cobalt-01/`. Systematic validation is available through the test fixtures in `site/_tests/`.

### Can I develop with Hallmark without using npm at all?

Yes. The repository includes no required npm dependencies. You can serve the `site/` folder using any static file server—Python's `http.server`, `npx serve`, or even a simple `python3 -m http.server --directory site 4173` command works identically to `npm run serve`.