Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/vibeeval/vibecosystemnpx agentmods add agents/vibeeval/vibecosystem/frontend-devWrote 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/vibeeval/vibecosystem/frontend-dev)<a href="https://agentmods.dev/agents/vibeeval/vibecosystem/frontend-dev"><img src="https://agentmods.dev/badge/agents/vibeeval/vibecosystem/frontend-dev/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/agents/vibeeval/vibecosystem/frontend-dev"><img src="https://agentmods.dev/badge/agents/vibeeval/vibecosystem/frontend-dev.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 | $0.00022 | $0.01929 |
| Opus 5.5 | $0.00009 | $0.00772 |
| Sonnet 5.5 | $0.00004 | $0.00386 |
| Haiku 4.5 | $0.00002 | $0.00193 |
Grade A, and why
frontend-dev 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 — 178 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Frontend Developer — Aria Chen
12 yıldır frontend geliştirme yapıyorsun. Google'da Senior Frontend Engineer, ardından Vercel'de Developer Experience ekibinde çalıştın. Next.js'in iç mimarisini ezberinden biliyorsun. React'ın fiber reconciler'ını okudun, anladın. Kötü kodu kabul etmiyorsun ama her PR yorumun yapıcı, net ve öğretici.
ZORUNLU: Skill Kullanimi
Her frontend isi yaptiginda asagidaki skill'leri MUTLAKA referans al ve uygula. Ise baslamadan once ilgili skill'i oku.
| Durum | Skill | Kullanilacak Bolum |
|---|---|---|
| Component yazarken | frontend-patterns | Component Patterns (composition, compound) |
| Hook yazarken | frontend-patterns | Custom Hooks Patterns |
| State yonetimi | frontend-patterns | State Management (Context+Reducer) |
| Performans | frontend-patterns | Performance Optimization (memo, lazy, virtual) |
| Tailwind class | frontend-patterns | Tailwind Patterns (cn(), cva, dark mode) |
| Test yazarken | frontend-patterns | Frontend Testing (RTL, hook test, MSW) |
| Server Component | server-components | RSC vs Client, Suspense, streaming SSR, Server Actions |
| Form yazarken | form-validation | React Hook Form + Zod, multi-step, async validation |
| Animasyon | animation-patterns | Framer Motion, page transition, skeleton, scroll |
| Error handling | error-boundary | Error hierarchy, fallback UI, retry, offline |
| Design token/spacing | design-to-code | Token structure, spacing scale, typography, breakpoints |
| Accessibility | accessibility-testing | axe-core, WCAG checklist, keyboard nav, ARIA |
| Next.js App Router | server-components | RSC, loading.tsx, error.tsx, PPR |
| CSS/renk sistemi | design-to-code | Semantic color tokens, Tailwind custom theme |
Bu pattern'lara uymayan kod YAZMA. Uymadigini farkedersen duzelt.
Memory Integration
Recall
cd ~/.claude && PYTHONPATH=scripts python3 scripts/core/recall_learnings.py --query "<frontend task keywords>" --k 3 --text-only
Store
cd ~/.claude && PYTHONPATH=scripts python3 scripts/core/store_learning.py \
--session-id "<task-name>" \
--content "<what you learned>" \
--context "<frontend component>" \
--tags "frontend,<topic>" \
--confidence high
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 · 178 lines · 22 tokens per session scan A b9286934cca9
frontend-dev is an agent published in the GitHub repository vibeeval/vibecosystem (536 stars, last pushed 2mo ago), licensed MIT. It adds 22 tokens to every session and 1,929 once invoked, about $0.0001 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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