Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/owl-listener/designpowers/ui-compositionnpx skills add Owl-Listener/designpowers --skill ui-compositiongit clone --depth 1 https://github.com/Owl-Listener/designpowersWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/owl-listener/designpowers/ui-composition)<a href="https://agentmods.dev/skills/owl-listener/designpowers/ui-composition"><img src="https://agentmods.dev/badge/skills/owl-listener/designpowers/ui-composition.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00039 | $0.01048 |
| Opus 5 | $0.00019 | $0.00524 |
| Sonnet 5 | $0.00008 | $0.00210 |
| Haiku 4.5 | $0.00004 | $0.00105 |
Grade A, and why
ui-composition scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 118 lines — stays where its author put it; the contents beside it link to each section on GitHub.
UI Composition
Visual design is where intent becomes tangible. Every colour, every spacing decision, every typographic choice either includes or excludes people. This skill ensures visual decisions are principled, systematic, and inclusive.
When to Use
- Designing screen layouts or page structures
- Choosing or refining colour palettes
- Setting typography systems
- Establishing spacing and grid systems
- Designing for responsive breakpoints
- Creating or modifying visual hierarchy
- Designing dark mode or high contrast variants
Process
Step 1: Reference the Foundation
Before making visual decisions, confirm you have:
- Design brief or strategy (from earlier phases)
- Personas (especially ability spectrum considerations)
- Existing design system (invoke
design-system-alignmentif one exists)
Step 2: Layout and Structure
Grid system:
- Define columns, gutters, and margins
- Ensure the grid adapts across breakpoints (mobile, tablet, desktop)
- Test that content reflows sensibly when zoomed to 200%
Visual hierarchy:
- Establish a clear reading order that works both visually and in the DOM
- Ensure the hierarchy communicates through structure, not colour alone
- Verify that removing all colour still leaves a readable, navigable page
Spacing system:
- Use a consistent spacing scale (e.g., 4px base)
- Ensure touch targets are at least 44x44px
- Provide adequate spacing between interactive elements to prevent accidental activation
Step 3: Colour
Palette construction:
- Define primary, secondary, neutral, and semantic colours (success, warning, error, info)
- Every colour pairing must meet WCAG AA contrast ratios minimum (4.5:1 for text, 3:1 for large text and UI components)
- Target WCAG AAA (7:1) where feasible
Colour independence:
- Never convey information through colour alone
- Always pair colour with text labels, icons, or patterns
- Test with simulated colour blindness (protanopia, deuteranopia, tritanopia)
Dark mode / high contrast:
- If applicable, design dark mode as a first-class experience, not an afterthought
- Ensure all contrast ratios hold in both modes
- Respect
prefers-color-schemeandprefers-contrastmedia queries
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 4d ago First seen · 118 lines · 39 tokens per session scan A 0ccf865f5ec2
ui-composition is a skill published in the GitHub repository Owl-Listener/designpowers (240 stars, last pushed 2mo ago), licensed MIT. It adds 39 tokens to every session and 1,048 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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