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/cloudnative-co/claude-code-starter-kit/frontend-patternsnpx skills add cloudnative-co/claude-code-starter-kit --skill frontend-patternsgit clone --depth 1 https://github.com/cloudnative-co/claude-code-starter-kitWhat 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 | $0.00024 | $0.00443 |
| Opus 5 | $0.00012 | $0.00221 |
| Sonnet 5 | $0.00005 | $0.00089 |
| Haiku 4.5 | $0.00002 | $0.00044 |
Grade A, and why
frontend-patterns 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 2d 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.
What it actually says
Frontend Development Patterns
Modern frontend patterns for React, Next.js, and performant user interfaces.
Pattern Categories
Component Patterns
Composition over inheritance, compound components, render props. See references/component-patterns.md for implementations.
Custom Hooks
Reusable hooks: useToggle, useDebounce; server state via TanStack Query / SWR. See references/hooks-patterns.md for implementations.
State Management & Performance
Context + Reducer pattern, memoization, code splitting, virtualization. See references/state-performance.md for implementations.
Forms, Error Boundaries, Animation & Accessibility
Controlled forms with validation, ErrorBoundary, motion (formerly Framer Motion), keyboard navigation, focus management. See references/forms-errors-a11y.md for implementations.
Quick Decision Guide
| Need | Pattern |
|---|---|
| Shared state across siblings | Context + Reducer |
| Expensive computation (no React Compiler) | useMemo |
| Stable callback reference (no React Compiler) | useCallback |
| Prevent unnecessary re-renders (no React Compiler) | React.memo |
| Large list rendering | Virtualization (@tanstack/react-virtual) |
| Heavy component | lazy() + Suspense |
| Form validation | Controlled form + error state |
| Graceful error handling | ErrorBoundary class component |
| Keyboard accessible UI | role, aria-*, onKeyDown handlers |
Note: On projects using React Compiler, manual memoization (useMemo/useCallback/React.memo) is generally unnecessary; add it only when profiling shows a real problem.
Remember: Choose patterns that fit your project complexity. Not every project needs every pattern.
What ships with it
4 files 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.
- 2d ago First seen · 46 lines · 24 tokens per session scan A 00dad8ce6d9a
frontend-patterns is a skill published in the GitHub repository cloudnative-co/claude-code-starter-kit (147 stars, last pushed 9d ago), licensed MIT. It adds 24 tokens to every session and 443 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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