Hax Design System

What it does

When your agent uses it

• Styling components
• Auditing CSS for DDD compliance
• Migrating from SimpleColors
• Creating new themes in the HAX ecosystem

Example prompts

• “/hax-design-system”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Import DDD: Always import import '@haxtheweb/d-d-d/d-d-d.js' and extend DDD directly (never DDD(LitElement)).
2. 2Use DDD Tokens: Apply DDD CSS custom properties for all styling
3. 3SimpleColors Fallback: Use SimpleColors only when DDD does not provide the needed color variation. 19 hues with 12 shades each (1-12)…
4. 4Audit: Verify token usage, consistency across breakpoints, accessibility contrast, and performance (minimal custom CSS beyond tokens).
5. 5Dark Mode: Check dark mode compliance when auditing elements. Ensure color combinations maintain proper contrast ratios.

What it can do on your machine

Read from SKILL.md and the folder at commit 3542096. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are css).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Hax Design System loads about 836 tokens when it runs, and up to ~14k if it reads all its reference files. Until then it costs about 62 tokens; SKILL.md has 306 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~62

When it runs · the whole SKILL.md, loaded when a task matches

~836

With references · SKILL.md plus every file in references/, read only if the agent opens them

~14k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from haxtheweb/haxcms-php at commit 3542096, republished under its Apache-2.0 licence (© haxtheweb). 306 words, ~836 tokens.

name

hax-design-system

description

Apply the DDD (Design, Develop, Destroy) design system and manage SimpleColors legacy usage. Use when styling components, auditing CSS for DDD compliance, migrating from SimpleColors, or creating new themes in the HAX ecosystem.

version

1.0.0

license

Apache-2.0

metadata.author

haxtheweb

metadata.tags

hax, design-system, ddd, simplecolors, css, tokens, accessibility

:host {
  display: block;
  font-family: var(--ddd-font-primary);
  color: var(--ddd-theme-default-coalyGray);
  margin: var(--ddd-spacing-4);
}

.component-header {
  font-size: var(--ddd-font-size-l);
  font-weight: var(--ddd-font-weight-medium);
  margin-bottom: var(--ddd-spacing-3);
}

@media (max-width: 768px) {
  :host {
    margin: var(--ddd-spacing-2);
  }
  .component-header {
    font-size: var(--ddd-font-size-m);
  }
}

© haxtheweb, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 2 other files (references) in .well-known/agent-skills/hax-design-system of haxtheweb/haxcms-php.

• SKILL.md
• references/ddd-tokens.md
• references/simplecolors-migration.md

Open the folder on GitHubat commit 3542096