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eeaeea/eea.agent.skills/skills/eea-design-system/SKILL.md

eea-design-system

Skill7 starsChanged 6 months agoMITView on GitHub

European Environment Agency design system for Volto-based web applications. Covers colors, typography, spacing, components, and branding assets. Use when generating, reviewing, or refactoring UI code for EEA projects.

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We split this skill into the rules it gives an agent

13 rules. About 0 are common, 10 are distinctive, and 3 are very specific to this project.

  • ≈0

    Common · estimate

    Many files like this have a rule of this kind.

  • ≈10

    Distinctive · estimate

    This author's own choices. Worth a look.

  • 3

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Distinctive:

    When a task involves UI, UX, or branding for an EEA project:

    line 39
  2. Very specific:

    If logos are needed, pick the correct variant from assets/ and respect the usage rules in EEA-OVERRIDES.md.

    line 43
  3. Distinctive:

    Ensure all color combinations meet WCAG 2.1 AA contrast ratios.

    line 45
  4. Very specific:

    Prefer sharp edges (border-radius: 0px) unless the component variant explicitly requires rounding.

    line 46
  5. Distinctive:

    Use the 8px grid for spacing and sizing decisions.

    line 48
  6. Distinctive:

    Never crop, amend, or distort EEA logos.

    line 69
  7. Distinctive:

    All public-facing applications must comply with WCAG 2.1 Level AA.

    line 71
  8. Very specific:

    Default border-radius is 0px across the system.

    line 72
  9. Distinctive:

    When design system tasks are complete, consider these EEA skills:

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  10. Distinctive:

    When applying design system assets in EEA contexts:

    line 126
  11. Distinctive:

    Consider EEA's internal caching layers for static assets.

    line 131
  12. Distinctive:

    All web applications must comply with WCAG 2.1 Level AA

    line 137
  13. Distinctive:

    All images must have meaningful alt text

    line 142

≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

EEA Design System

Version: 1.0.0 Source: https://github.com/eea/volto-eea-design-system Docs: https://eea.github.io/volto-eea-design-system/

This skill governs how agents apply the EEA Design System when generating, reviewing, or refactoring UI code for EEA web applications.

How to Use This Skill

  1. Read references/DESIGN.md for the canonical design tokens (colors, typography, spacing, components).
  2. Use assets/ for official EEA and thematic platform logos.
  3. Follow EEA-OVERRIDES.md for EEA-specific constraints (logo legal rules, proxy compliance, corporate identity manual links).
  4. Reference the Logo component page for implementation details: https://eea.github.io/volto-eea-design-system/docs/webdev/Components/Logo/

Agent Workflow

When a task involves UI, UX, or branding for an EEA project:

  1. Load this skill.
  2. Open references/DESIGN.md and apply the relevant tokens.
  3. If logos are needed, pick the correct variant from assets/ and respect the usage rules in EEA-OVERRIDES.md.
  4. Ensure all color combinations meet WCAG 2.1 AA contrast ratios.
  5. Prefer sharp edges (border-radius: 0px) unless the component variant explicitly requires rounding.
  6. Use the 8px grid for spacing and sizing decisions.

Asset Usage Quick Reference

AssetUse Case
eea-logo.svgPrimary EEA logo on light backgrounds
eea-logo-white.svgEEA logo on dark/colored backgrounds
eea_icon.pngFavicon / app icon
favicon.icoBrowser favicon
bise-logo.svg / bise-logo-white.svgBiodiversity Information System
fise-logo.svg / fise-logo-white.svgForest Information System
wise-freshwater-logo.svg / wise-freshwater-logo-white.svgWISE Freshwater
wise-marine-logo.svg / wise-marine-logo-white.svgWISE Marine

Key Constraints

  • Never crop, amend, or distort EEA logos.
  • Thematic platform logos follow the same legal rules as the main EEA logo.
  • All public-facing applications must comply with WCAG 2.1 Level AA.
  • Default border-radius is 0px across the system.
  • Typography: Roboto (fallback Arial), base 16px, bold for headings only.

Handoff to Other EEA Skills

When design system tasks are complete, consider these EEA skills:

  • eea-volto (future): EEA's Volto/Plone 6 frontend development
  • eea-accessibility (future): Detailed EEA accessibility compliance
<!-- BEGIN EEA-OVERRIDES -->

EEA-Specific Overrides

<!-- EEA-Overrides-Version: 1.0 --><!-- Last-Sync: 2026-05-21 -->

EEA Logo Usage Rules

The Agency logo is the property of the EEA and is registered with WIPO (World Intellectual Property Organisation). It may not be cropped or amended in any other way. See the EEA's corporate identity manual for full graphical style guidelines.

  • Journalistic use: The logo may be reproduced for journalistic purposes in articles etc. without advance permission.
  • Other use: Permission is required. Address requests via the EEA online form.
  • Co-branding: The Agency normally allows use on products or services prepared jointly with other bodies, or in connection with events where it is a contributor or co-organiser.
  • Endorsement: Requests to use the logo to endorse products, services, events or activities in which the EEA is not actively involved are normally declined.

Legal Notice

Full legal notice: https://www.eea.europa.eu/en/legal-notice#eea-logo

Corporate Identity Manual

The EEA's corporate identity manual provides a graphical style guide for EEA reports and online services as well as guidelines for a coherent look of other items produced by the Agency.

Reference: https://www.eea.europa.eu/en/newsroom/branding-materials

Logo Component Documentation

For Logo component implementation details (variants, sizing, responsive behavior), see: https://eea.github.io/volto-eea-design-system/docs/webdev/Components/Logo/

EEA Network Infrastructure

When applying design system assets in EEA contexts:

  • Respect HTTP_PROXY and HTTPS_PROXY environment variables for external network calls.
  • EEA applications run on EEA-managed infrastructure, not Vercel.
  • Consider EEA's internal caching layers for static assets.

Accessibility

EEA follows WCAG 2.1 Level AA as the minimum accessibility standard:

  • All web applications must comply with WCAG 2.1 Level AA
  • Reference: https://www.w3.org/WAI/WCAG21/quickref/
  • EEA-specific accessibility checklist:
    • Keyboard navigation must work for all interactive elements
    • Color contrast ratios must meet 4.5:1 for normal text, 3:1 for large text
    • All images must have meaningful alt text
    • Forms must have proper labels and error handling
    • Focus indicators must be visible
    • Screen reader compatibility is required

Notes

<!-- END EEA-OVERRIDES --><!-- Merged Build: upstream SKILL.md + EEA-OVERRIDES.md --><!-- Auto-generated by scripts/build.sh - DO NOT EDIT DIRECTLY --><!-- Source: https://github.com/eea/eea.agent.skills -->

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