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 skills add bugrabilge/bilge-development-kit --skill frontend-designgit clone --depth 1 https://github.com/bugrabilge/bilge-development-kitWrote 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/bugrabilge/bilge-development-kit/frontend-design)<a href="https://agentmods.dev/skills/bugrabilge/bilge-development-kit/frontend-design"><img src="https://agentmods.dev/badge/skills/bugrabilge/bilge-development-kit/frontend-design.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 | $0.00037 | $0.01536 |
| Opus 5 | $0.00018 | $0.00768 |
| Sonnet 5 | $0.00007 | $0.00307 |
| Haiku 4.5 | $0.00004 | $0.00154 |
Grade A, and why
frontend-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 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 — 170 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Frontend Design
"Great frontend design is invisible; users notice only when it fails."
When to Use
- Architecting the component structure of a frontend application
- Making UI/UX decisions during implementation
- Building or extending a design system
- Planning responsive layouts and interaction patterns
- Reviewing frontend code for design consistency and usability
UI/UX Principles for Developers
Clarity Over Cleverness
- Every element should have an obvious purpose
- Labels, buttons, and links should describe their action ("Save Draft" not "Submit")
- Use progressive disclosure: show only what is needed at each step
- Error states must explain what happened and what the user should do next
Consistency
- Same action should look and behave the same everywhere
- Use consistent spacing, typography, and color throughout the application
- Follow platform conventions (e.g., confirmation dialogs, form validation patterns)
- Maintain consistent terminology across the entire product
Feedback and Responsiveness
- Every user action must produce visible feedback within 100ms
- Use loading indicators for operations over 300ms
- Use skeleton screens instead of spinners for content loading
- Optimistic updates for low-risk actions (likes, toggles); confirm for destructive ones
- Disable buttons after submission to prevent double-clicks
Forgiveness
- Support undo for destructive actions instead of "Are you sure?" dialogs
- Auto-save form progress where possible
- Preserve user input on navigation (back button should not lose form data)
- Provide clear, non-punishing error recovery paths
Component Architecture
Atomic Design Hierarchy
- Atoms: Smallest units (Button, Input, Label, Icon, Badge)
- Molecules: Combinations of atoms (SearchBar = Input + Button, FormField = Label + Input + ErrorText)
- Organisms: Complex sections (Header, Sidebar, UserCard, DataTable)
- Templates: Page-level layouts with placeholder content
- Pages: Templates with real data connected
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 · 170 lines · 37 tokens per session scan A 37cecb18063f
frontend-design is a skill published in the GitHub repository bugrabilge/bilge-development-kit (10 stars, last pushed 4mo ago), licensed MIT. It adds 37 tokens to every session and 1,536 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 2026-09-03.
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