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 byerlikaya/claude-starter-kit --skill frontendgit clone --depth 1 https://github.com/byerlikaya/claude-starter-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/byerlikaya/claude-starter-kit/frontend)<a href="https://agentmods.dev/skills/byerlikaya/claude-starter-kit/frontend"><img src="https://agentmods.dev/badge/skills/byerlikaya/claude-starter-kit/frontend/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/skills/byerlikaya/claude-starter-kit/frontend"><img src="https://agentmods.dev/badge/skills/byerlikaya/claude-starter-kit/frontend.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 | $0.00048 | $0.00775 |
| Opus 5.5 | $0.00019 | $0.00310 |
| Sonnet 5.5 | $0.00010 | $0.00155 |
| Haiku 4.5 | $0.00005 | $0.00077 |
Grade A, and why
frontend 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 — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Frontend Discipline (stack-agnostic)
Trigger phrases: "frontend", "screen size", "component", "page", "UI", "state management", "interface"
Web (React/Next/Vue/Svelte/Angular), mobile (React Native/Flutter) or desktop — shared principles. The stack-specific "how" (native bridge, router choice, etc.) lives in the relevant project skill; this skill applies to all of them.
Architecture
- Presentation / logic separation: component/view is pure and thin; business logic lives in the hook/composable/service layer.
- Reusability: repeated UI is factored out; the prop contract is clear and typed.
- Folder: feature-based (
features/<name>/) — view, logic, and test together.
State & data
- Local state first (
useState/signal); if global is needed, the project's choice (store/context) — nothing imposed. - Data fetching: cache + error + loading states are considered; race/abort are handled.
State-complete UI (design it from the start)
Every data-bound view covers four states: loading · empty · error · full. Don't code only the "full" case; empty/error/loading are part of the experience.
i18n & accessibility (default, not decoration)
- User-visible text comes from the language file (project languages); no hard-coded strings (
i18n-integrity). - Meaningful labels/roles, sufficient contrast, keyboard/screen-reader access, appropriate touch/click target.
Visual & UX quality
This skill covers structure; the visual/UX design layer — hierarchy, spacing rhythm, typographic scale, a
restrained color system, and polished states — lives in frontend-design. Apply it when the work is about how the
interface looks and feels, not just how it's wired.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 · 59 lines · 48 tokens per session scan A 1d9196d73c72
frontend is a skill published in the GitHub repository byerlikaya/claude-starter-kit (24 stars, last pushed 1mo ago), licensed MIT. It adds 48 tokens to every session and 775 once invoked, about $0.0002 per session on Opus 5.5. 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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