OpenFang is an open-source operating system for autonomous AI agents, built in Rust to run agents that perform scheduled work such as research, monitoring, lead generation, and reporting. It is for people who want agents to operate continuously rather than only respond to prompts. The catalogue add-ons extend workflows around the OpenFang agent system.
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/rightnow-ai/openfang/css-expertnpx skills add RightNow-AI/openfang --skill css-expertgit clone --depth 1 https://github.com/RightNow-AI/openfangWrote 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/rightnow-ai/openfang/css-expert)<a href="https://agentmods.dev/skills/rightnow-ai/openfang/css-expert"><img src="https://agentmods.dev/badge/skills/rightnow-ai/openfang/css-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 | $0.00021 | $0.00624 |
| Opus 5 | $0.00010 | $0.00312 |
| Sonnet 5 | $0.00004 | $0.00125 |
| Haiku 4.5 | $0.00002 | $0.00062 |
Grade A, and why
css-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.
Copies of this mod
2 near-identical copies found in the catalogue:
- css-expert — 100% identical, 0 lines differ
- css-expert — 89% identical, 3 lines differ
How it starts
The opening of the file, as written. The whole thing — 40 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CSS Expert
A front-end layout specialist with deep command of modern CSS, from flexbox and grid to container queries and cascade layers. This skill provides precise, standards-compliant guidance for building responsive, accessible, and maintainable user interfaces using the latest CSS specifications and best practices.
Key Principles
- Use flexbox for one-dimensional layouts (rows or columns) and CSS Grid for two-dimensional layouts (rows and columns simultaneously)
- Embrace custom properties (CSS variables) for theming, spacing scales, and any value that repeats or needs runtime adjustment
- Design mobile-first with min-width media queries, layering complexity as viewport size increases
- Prefer logical properties (inline-start, block-end) over physical ones (left, bottom) for internationalization-ready layouts
- Leverage the cascade intentionally with @layer declarations to control specificity without resorting to !important
Techniques
- Use flexbox justify-content and align-items for main-axis and cross-axis alignment; flex-wrap with gap for fluid card layouts
- Define CSS Grid layouts with grid-template-areas for named regions, and auto-fit/auto-fill with minmax() for responsive grids without media queries
- Create design tokens as custom properties on :root (--color-primary, --space-md) and override them in scoped selectors or media queries
- Use @container queries to style components based on their parent container size rather than the viewport
- Build animations with @keyframes and animation shorthand; prefer transform and opacity for GPU-accelerated, jank-free motion
- Apply transitions on interactive states (hover, focus-visible) with appropriate duration (150-300ms) and easing functions
- Use the :has() selector for parent-aware styling, :is()/:where() for grouping selectors with controlled specificity
Common Patterns
- Holy Grail Layout: CSS Grid with grid-template-rows (auto 1fr auto) and grid-template-columns (sidebar content sidebar) for header/footer/sidebar page structures
- Fluid Typography: clamp(1rem, 2.5vw, 2rem) for font sizes that scale smoothly between minimum and maximum values without breakpoints
- Aspect Ratio Boxes: Use the aspect-ratio property directly instead of the legacy padding-bottom hack for responsive media containers
- Dark Mode Toggle: Define color tokens as custom properties, swap them inside a prefers-color-scheme media query or a data-theme attribute selector
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 · 40 lines · 21 tokens per session scan A ca02c989abda
css-expert is a skill published in the GitHub repository RightNow-AI/openfang (18,162 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 21 tokens to every session and 624 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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