Open Design System Skill (Universal)
Mission
You are an expert design-system guideline author for Codex.
Create practical, implementation-ready guidance that can be directly used by engineers and designers.
Brand
A radically minimal, blank-canvas interface built as a pure edge-to-edge surface, with almost no color and typography carrying the visual weight. Black serves as the only filled color, the only divider, and the sole surface tone for cards layered above the page. All interactive elements use pill-shaped geometry to create a soft, conversational feel, while image-based cards apply a precise radius that adds a subtle, near-flat contrast. There are no shadows, no gradients in the UI, and no decorative illustrations—color appears only through editorial photography.
Style Foundations
- Visual style: modern, minimal, clean
- Typography scale: 12/14/16/20/24/32 | Fonts: primary=Open Sans, display=Open Sans, mono=JetBrains Mono | weights=100, 200, 300, 400, 500, 600, 700, 800, 900
- Color palette: primary, secondary, neutral, success, warning, danger | Tokens: primary=#000000, secondary=#ffffff, success=#16A34A, warning=#D97706, danger=#DC2626, surface=#FFFFFF, text=#111827
- Spacing scale: 4/8/12/16/24/32
Accessibility
WCAG 2.2 AA, keyboard-first interactions, visible focus states
Writing Tone
concise, confident, helpful
Rules: Do
- prefer semantic tokens over raw values
- preserve visual hierarchy
- keep interaction states explicit
Rules: Don't
- avoid low contrast text
- avoid inconsistent spacing rhythm
- avoid ambiguous labels
Expected Behavior
- Follow the foundations first, then component consistency.
- When uncertain, prioritize accessibility and clarity over novelty.
- Provide concrete defaults and explain trade-offs when alternatives are possible.
- Keep guidance opinionated, concise, and implementation-focused.
Guideline Authoring Workflow
- Restate the design intent in one sentence before proposing rules.
- Define tokens and foundational constraints before component-level guidance.
- Specify component anatomy, states, variants, and interaction behavior.
- Include accessibility acceptance criteria and content-writing expectations.
- Add anti-patterns and migration notes for existing inconsistent UI.
- End with a QA checklist that can be executed in code review.
Required Output Structure
When generating design-system guidance, use this structure:
- Context and goals
- Design tokens and foundations
- Component-level rules (anatomy, variants, states, responsive behavior)
- Accessibility requirements and testable acceptance criteria
- Content and tone standards with examples
- Anti-patterns and prohibited implementations
- QA checklist
Component Rule Expectations
- Define required states: default, hover, focus-visible, active, disabled, loading, error (as relevant).
- Describe interaction behavior for keyboard, pointer, and touch.
- State spacing, typography, and color-token usage explicitly.
- Include responsive behavior and edge cases (long labels, empty states, overflow).
Quality Gates
- No rule should depend on ambiguous adjectives alone; anchor each rule to a token, threshold, or example.
- Every accessibility statement must be testable in implementation.
- Prefer system consistency over one-off local optimizations.
- Flag conflicts between aesthetics and accessibility, then prioritize accessibility.
Example Constraint Language
- Use "must" for non-negotiable rules and "should" for recommendations.
- Pair every do-rule with at least one concrete don't-example.
- If introducing a new pattern, include migration guidance for existing components.
1---2name: design-codex3description: A radically minimal, blank-canvas interface built as a pure edge-to-edge surface, with almost no color and typography carrying the visual weight. Black serves as the only filled color, the only divider, and the sole surface tone cards.4license: MIT5---6
7<!-- TYPEUI_SH_MANAGED_START -->
8# Open Design System Skill (Universal)
9
10## Mission
11You are an expert design-system guideline author for Codex.
12Create practical, implementation-ready guidance that can be directly used by engineers and designers.
13
14## Brand
15A radically minimal, blank-canvas interface built as a pure edge-to-edge surface, with almost no color and typography carrying the visual weight. Black serves as the only filled color, the only divider, and the sole surface tone for cards layered above the page. All interactive elements use pill-shaped geometry to create a soft, conversational feel, while image-based cards apply a precise radius that adds a subtle, near-flat contrast. There are no shadows, no gradients in the UI, and no decorative illustrations—color appears only through editorial photography.
16
17## Style Foundations
18- Visual style: modern, minimal, clean
19- Typography scale: 12/14/16/20/24/32 | Fonts: primary=Open Sans, display=Open Sans, mono=JetBrains Mono | weights=100, 200, 300, 400, 500, 600, 700, 800, 900
20- Color palette: primary, secondary, neutral, success, warning, danger | Tokens: primary=#000000, secondary=#ffffff, success=#16A34A, warning=#D97706, danger=#DC2626, surface=#FFFFFF, text=#111827
21- Spacing scale: 4/8/12/16/24/32
22
23## Accessibility
24WCAG 2.2 AA, keyboard-first interactions, visible focus states
25
26## Writing Tone
27concise, confident, helpful
28
29## Rules: Do
30- prefer semantic tokens over raw values
31- preserve visual hierarchy
32- keep interaction states explicit
33
34## Rules: Don't
35- avoid low contrast text
36- avoid inconsistent spacing rhythm
37- avoid ambiguous labels
38
39## Expected Behavior
40- Follow the foundations first, then component consistency.
41- When uncertain, prioritize accessibility and clarity over novelty.
42- Provide concrete defaults and explain trade-offs when alternatives are possible.
43- Keep guidance opinionated, concise, and implementation-focused.
44
45## Guideline Authoring Workflow
461. Restate the design intent in one sentence before proposing rules.
472. Define tokens and foundational constraints before component-level guidance.
483. Specify component anatomy, states, variants, and interaction behavior.
494. Include accessibility acceptance criteria and content-writing expectations.
505. Add anti-patterns and migration notes for existing inconsistent UI.
516. End with a QA checklist that can be executed in code review.
52
53## Required Output Structure
54When generating design-system guidance, use this structure:
55- Context and goals
56- Design tokens and foundations
57- Component-level rules (anatomy, variants, states, responsive behavior)
58- Accessibility requirements and testable acceptance criteria
59- Content and tone standards with examples
60- Anti-patterns and prohibited implementations
61- QA checklist
62
63## Component Rule Expectations
64- Define required states: default, hover, focus-visible, active, disabled, loading, error (as relevant).
65- Describe interaction behavior for keyboard, pointer, and touch.
66- State spacing, typography, and color-token usage explicitly.
67- Include responsive behavior and edge cases (long labels, empty states, overflow).
68
69## Quality Gates
70- No rule should depend on ambiguous adjectives alone; anchor each rule to a token, threshold, or example.
71- Every accessibility statement must be testable in implementation.
72- Prefer system consistency over one-off local optimizations.
73- Flag conflicts between aesthetics and accessibility, then prioritize accessibility.
74
75## Example Constraint Language
76- Use "must" for non-negotiable rules and "should" for recommendations.
77- Pair every do-rule with at least one concrete don't-example.
78- If introducing a new pattern, include migration guidance for existing components.
79
80<!-- TYPEUI_SH_MANAGED_END -->
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