Agent Skills

A collection of 9 engineering AI agent skills for Claude Code. Each skill gives Claude deep domain expertise — decision rules, production-grade code patterns, reference material, and runnable scripts.

Built to the Agent Skills Spec.

Quick Start

Install the skills CLI:

# Install a single skill
npx skills add PeterHdd/agent-skills --skill engineering-frontend-developer

# Install all 9 skills
npx skills add PeterHdd/agent-skills --all

After installing, the skill is available in your Claude Code sessions automatically. Claude reads the skill's decision rules and uses them when relevant to your task.

How It Works

Each skill is a self-contained directory:

skills/engineering-frontend-developer/
├── SKILL.md              # Decision rules and workflow (loaded by Claude)
├── references/           # Deep code patterns and examples
│   ├── react-patterns.md
│   ├── typescript-patterns.md
│   └── css-patterns.md
└── scripts/              # Runnable CLI tools
    └── check_bundle.sh

• SKILL.md — The core file. Contains "when X, do Y" decision rules that guide Claude's behavior. Claude reads this automatically when the skill is relevant.
• references/ — Detailed code examples, architecture patterns, and implementation guides that SKILL.md links to. Claude reads these on demand when deeper context is needed.
• scripts/ — Standalone CLI tools (Python/Bash) that Claude can run during your session. All scripts support --help and output structured markdown.

Usage Examples

Frontend Development

npx skills add PeterHdd/agent-skills --skill engineering-frontend-developer

Then in Claude Code:

> Build a dashboard with a data table that supports sorting, filtering, and pagination

Claude will use React patterns from the skill — compound components, TypeScript generics,
CSS Grid layout, virtualized rendering — and check your bundle size stays under 200KB.

Backend Architecture

npx skills add PeterHdd/agent-skills --skill engineering-backend-architect

> Design the API layer for a multi-tenant SaaS app

Claude will apply distributed patterns (circuit breaker, saga, outbox), set up
cursor pagination, rate limiting with Redis, and Zod validation middleware.

System Design

npx skills add PeterHdd/agent-skills --skill engineering-system-designer

> Design a URL shortener that handles 100M URLs per month

Claude will run capacity calculations, design the schema with sharding strategy,
choose cache-aside with Redis, and produce a full system design document.

DevOps

npx skills add PeterHdd/agent-skills --skill engineering-devops-automator

> Set up CI/CD for our Node.js app with Docker and Kubernetes

Claude will generate multi-stage Dockerfiles, Kubernetes Deployments with health probes,
HPA autoscaling, GitHub Actions pipelines, and Prometheus monitoring.

Mobile App Development

npx skills add PeterHdd/agent-skills --skill engineering-mobile-app-builder

> Build an offline-first React Native app with push notifications

Claude will implement a mutation queue with AsyncStorage, NetInfo-based sync,
Firebase push notifications, and Zustand state management with MMKV persistence.

Available Skills (9 Engineering Skills)

Skill	What It Does
engineering-senior-developer	Technology selection (language, database, API style), task estimation with hour budgets, refactoring decision rules, code review patterns, architecture decisions, performance profiling, debugging strategies
engineering-system-designer	Capacity planning with formulas, failure analysis, scaling patterns (sharding, CQRS, consistent hashing), CAP tradeoff enforcement, system design documents
engineering-backend-architect	Distributed systems patterns, database optimization with scaling thresholds, API design, circuit breakers, data migration rules, event-driven architecture
engineering-frontend-developer	React/Vue/Svelte components, CSS debugging decision rules, SSR/Server Components patterns, build tooling selection, performance debugging workflow, WCAG accessibility
engineering-mobile-app-builder	SwiftUI, Jetpack Compose, React Native, Flutter, platform-specific gotchas (iOS background limits, Android Doze), offline sync strategies, push notifications, biometric auth
engineering-ml-engineer	PyTorch, HuggingFace Transformers, LoRA/QLoRA fine-tuning, RAG pipelines, scikit-learn, XGBoost, training strategy by data size, GPU memory tiers, model deployment
engineering-devops-automator	Docker, Kubernetes, Terraform, CI/CD pipelines, cost estimation with dollar amounts, service selection decision trees, monitoring, secrets management
engineering-rapid-prototyper	Next.js/Supabase/Prisma full-stack, shadcn/ui, tRPC, kill criteria, scope limits, hour-by-hour workflow, rapid MVP scaffolding
engineering-security-engineer	STRIDE/DREAD threat modeling, OWASP Top 10 with test payloads, secrets management, supply chain security, API security, compliance (SOC 2, GDPR, HIPAA)

Requirements

• Claude Code or Codex CLI
• skills CLI (npx skills — no install needed)
• Python 3.8+ (for Python scripts)
• Bash (for shell scripts)