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.
git clone --depth 1 https://github.com/bmoff/code-first-designWrote 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/rules/bmoff/code-first-design/design)<a href="https://agentmods.dev/rules/bmoff/code-first-design/design"><img src="https://agentmods.dev/badge/rules/bmoff/code-first-design/design/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/rules/bmoff/code-first-design/design"><img src="https://agentmods.dev/badge/rules/bmoff/code-first-design/design.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00000 | $0.00758 |
| Opus 5.5 | $0.00000 | $0.00303 |
| Sonnet 5.5 | $0.00000 | $0.00152 |
| Haiku 4.5 | $0.00000 | $0.00076 |
Grade A, and why
design 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 1mo 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 — 89 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Design Principles
Color Palette
Use the design tokens defined in app/globals.css. The actual color values are defined there as CSS variables.
Available tokens (reference app/globals.css for exact values):
- Primary:
bg-primary,text-primary-foreground,hover:bg-primary/90 - Secondary:
bg-secondary,text-secondary-foreground - Accent:
bg-accent,text-accent-foreground,hover:bg-accent - Destructive:
bg-destructive,text-destructive-foreground - Background:
bg-background,text-foreground - Card:
bg-card,text-card-foreground - Muted:
bg-muted,text-muted-foreground - Border:
border-border,border-border/30(with opacity)
Always use these semantic tokens rather than hardcoded colours. For opacity variations, use /30, /50, /90 etc.
Typography
Use Tailwind's typography scale. Check your project's font configuration in app/layout.tsx or app/globals.css for custom fonts.
Typography scale:
- Headings:
text-4xl,text-3xl,text-2xl,text-xl,text-lg - Body:
text-base(default) - Small:
text-sm,text-xs - Weights:
font-normal,font-medium,font-semibold,font-bold - Line height: Defaults are appropriate, use
leading-tight,leading-relaxedif needed
For code/data: Use font-mono with appropriate sizing.
Spacing & Layout
Define spacing scale, grid system, and layout patterns.
Example:
- Base unit: 4px (0.25rem)
- Use Tailwind spacing scale: gap-4, p-6, mb-8
- Grid: Use CSS Grid or Flexbox for responsive layouts
- Container: max-w-5xl mx-auto for content width
Component Patterns
Document common component patterns, glassmorphism effects, animations, etc.
Example:
// Card pattern
<div className="p-6 rounded-xl border border-border/30 bg-card">
{/* Content */}
</div>
// Button with hover
<Button className="hover:bg-primary/90 transition-colors">
Click me
</Button>
Accessibility
Specify WCAG compliance level, contrast ratios, and keyboard navigation patterns.
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.
- 1mo ago First seen · 89 lines · 0 tokens per session scan A 64f5a734a03a
design is a cursor rule published in the GitHub repository bmoff/code-first-design (4 stars, last pushed 11mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 758 tokens. 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 2026-08-31.
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