Claude Code Infrastructure Showcase is a reference library of configuration patterns for Claude Code, including skills, hooks, agents, and commands that shape how the coding agent works. It helps developers organize and automate Claude Code in their own projects, especially larger TypeScript codebases. The catalogue entries are examples of infrastructure that users can copy into their projects.
Borrowing it
Nothing to install: this file belongs to diet103/claude-code-infrastructure-showcase. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/diet103/claude-code-infrastructure-showcase/main/.agents/skills/frontend-dev-guidelines/SKILL.mdgit clone --depth 1 https://github.com/diet103/claude-code-infrastructure-showcaseWrote 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/diet103/claude-code-infrastructure-showcase/frontend-dev-guidelines)<a href="https://agentmods.dev/skills/diet103/claude-code-infrastructure-showcase/frontend-dev-guidelines"><img src="https://agentmods.dev/badge/skills/diet103/claude-code-infrastructure-showcase/frontend-dev-guidelines/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/diet103/claude-code-infrastructure-showcase/frontend-dev-guidelines"><img src="https://agentmods.dev/badge/skills/diet103/claude-code-infrastructure-showcase/frontend-dev-guidelines.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00076 | $0.02788 |
| Opus 5.5 | $0.00030 | $0.01115 |
| Sonnet 5.5 | $0.00015 | $0.00558 |
| Haiku 4.5 | $0.00008 | $0.00279 |
Grade A, and why
frontend-dev-guidelines 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.
Copies of this mod
5 near-identical copies found in the catalogue:
- frontend-dev-guidelines — 95% identical, 3 lines differ
- frontend-dev-guidelines — 95% identical, 2 lines differ
- frontend-dev-guidelines — 95% identical, 7 lines differ
- frontend-dev-guidelines — 92% identical, 5 lines differ
- ck:frontend-development — 92% identical, 8 lines differ
How it starts
The opening of the file, as written. The whole thing — 401 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Frontend Development Guidelines
Purpose
Comprehensive guide for modern React development, emphasizing Suspense-based data fetching, lazy loading, proper file organization, and performance optimization.
Written for React 18 + TypeScript + MUI v7 + TanStack Router/Query. Different stack? Adapt the principles - see CLAUDE_INTEGRATION_GUIDE.md in the repo root.
When to Use This Skill
- Creating new components or pages
- Building new features
- Fetching data with TanStack Query
- Setting up routing with TanStack Router
- Styling components with MUI v7
- Performance optimization
- Organizing frontend code
- TypeScript best practices
Quick Start
New Component Checklist
Creating a component? Follow this checklist:
- Use
React.FC<Props>pattern with TypeScript - Lazy load if heavy component:
React.lazy(() => import()) - Wrap in
<SuspenseLoader>for loading states - Use
useSuspenseQueryfor data fetching - Import aliases:
@/,~types,~components,~features - Styles: Inline if <100 lines, separate file if >100 lines
- Use
useCallbackfor event handlers passed to children - Default export at bottom
- No early returns with loading spinners
- Use
useMuiSnackbarfor user notifications
New Feature Checklist
Creating a feature? Set up this structure:
- Create
features/{feature-name}/directory - Create subdirectories:
api/,components/,hooks/,helpers/,types/ - Create API service file:
api/{feature}Api.ts - Set up TypeScript types in
types/ - Create route in
routes/{feature-name}/index.tsx - Lazy load feature components
- Use Suspense boundaries
- Export public API from feature
index.ts
Import Aliases Quick Reference
| Alias | Resolves To | Example |
|---|---|---|
@/ |
src/ |
import { apiClient } from '@/lib/apiClient' |
~types |
src/types |
import type { User } from '~types/user' |
~components |
src/components |
import { SuspenseLoader } from '~components/SuspenseLoader' |
~features |
src/features |
import { authApi } from '~features/auth' |
What ships with it
10 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.
- resources/common-patterns.md 8.2 KB
- resources/complete-examples.md 24 KB
- resources/component-patterns.md 11 KB
- resources/data-fetching.md 20 KB
- resources/file-organization.md 12 KB
- resources/loading-and-error-states.md 12 KB
- resources/performance.md 9.4 KB
- resources/routing-guide.md 7.0 KB
- resources/styling-guide.md 7.7 KB
- resources/typescript-standards.md 8.2 KB
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 · 401 lines · 76 tokens per session scan A c5e42323a0bf
frontend-dev-guidelines is a skill published in the GitHub repository diet103/claude-code-infrastructure-showcase (10,037 stars, last pushed 3mo ago), licensed MIT. It adds 76 tokens to every session and 2,788 once invoked, about $0.0003 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.
Other skills, from other repositories
client-setup
Create a vanilla tRPC client with createTRPCClient (), configure link chain with httpBatchLink/httpLink, dynamic headers for auth, transformer on links (not client constructor). Infer types with inferRouterInputs and inferRouterOutputs. AbortController signal support. TRPCClientError typing.
adapter-express
Mount tRPC as Express middleware with createExpressMiddleware() from @trpc/server/adapters/express. Access Express req/res in createContext via CreateExpressContextOptions. Mount at a path prefix like app.use('/trpc', ...). Avoid global express.json() conflicting with tRPC body parsing for FormData.
trpc-router
Entry point for all tRPC skills. Decision tree routing by task: initTRPC.create(), t.router(), t.procedure, createTRPCClient, adapters, subscriptions, React Query, Next.js, links, middleware, validators, error handling, caching, FormData.
custom-features
Implement a Table v9 plugin when built-ins and typed meta are insufficient. Covers FeatureMaps, runtime lifecycle hooks, prototypes, and a complete checked example.
fast-typescript-check
Keep www-sacred's TypeScript fast to type-check and fast to run. Use when touching the ASCII/canvas animation components (the only real per-frame code here), tightening type-check wall-clock, or auditing a change for runtime or compiler regressions. Scoped to this repo — a React 19 / Next.js 16 component library plus…
port-sacred-terminal-ui-to-typescript-cli
Take a React Window.tsx (or any sacred component) and produce a terminal CLI screen written in TypeScript that uses Simulacrum — the sacred CLI framework in scripts/cli/lib/.