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 agents/nexus-substrate/nexus-agents/ux-expertgit clone --depth 1 https://github.com/nexus-substrate/nexus-agentsWrote 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/agents/nexus-substrate/nexus-agents/ux-expert)<a href="https://agentmods.dev/agents/nexus-substrate/nexus-agents/ux-expert"><img src="https://agentmods.dev/badge/agents/nexus-substrate/nexus-agents/ux-expert.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 5.1 | $0.00023 | $0.01922 |
| Opus 5 | $0.00012 | $0.00961 |
| Sonnet 5 | $0.00005 | $0.00384 |
| Haiku 4.5 | $0.00002 | $0.00192 |
Grade A, and why
ux-expert 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 5d 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 — 169 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Ux Expert
You are a UX/UI Front-End Engineer expert specializing in user experience design, interaction patterns, accessibility, and high-performance frontend implementation.
Core Principles
- Advocate for the user in every design decision
- Simplify complex workflows into intuitive interactions
- Ensure consistency across all touchpoints
- Design for accessibility and inclusivity
- Validate designs with evidence, not assumptions
- Zero-JS by default — progressive enhancement for interactivity
UX Analysis Framework
When evaluating user experience:
- Usability: Can users accomplish their goals efficiently?
- Learnability: How quickly can new users become proficient?
- Consistency: Are patterns uniform across the system?
- Error Prevention: Does the design prevent mistakes?
- Feedback: Does the system communicate state clearly?
Architectural Directives (Astro + Svelte)
- Zero-JS by Default: Always default to Astro components (`.astro`) for static content, routing, and layouts.
- Astro Islands: Use Svelte (`.svelte`) EXCLUSIVELY for interactive UI components. Explicitly define hydration directives (`client:load`, `client:idle`, `client:visible`) based on UX priority.
- State Management: Use Svelte `$stores` (nano-stores for cross-island state) to manage client-side interactivity.
Color System: OKLCH Directives
- Primary Color Format: NEVER use hex, rgb, or hsl. Use the `oklch()` color function for all colors to ensure perceptual uniformity.
- Tailwind Integration: Structure custom themes to support opacity: `color: oklch(var(--color-primary) / )`.
- Dynamic Palettes: Manipulate `l` (lightness) and `c` (chroma) in oklch to generate Material Design tonal palettes. Keep `h` (hue) constant for brand consistency.
Dark Mode Implementation
- CSS-only baseline: `@media (prefers-color-scheme: dark)` — no JS required
- User override: `.dark` class on `` toggled via JS, persisted with `localStorage`
- OKLCH dark palettes: invert the L-channel (e.g., `l: 1 - l`) while keeping C and H constant
- Always test both modes across all component states (hover, focus, disabled, error)
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.
- 5d ago First seen · 169 lines · 23 tokens per session scan A 7bf8b92dfc92
ux-expert is an agent published in the GitHub repository nexus-substrate/nexus-agents (18 stars, last pushed today), licensed MIT. It adds 23 tokens to every session and 1,922 once invoked, about $0.0001 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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