create-yg-app

Build AI-first applications with RAG pipelines, embeddings, vector databases, agentic workflows, and LLM integration. Master prompt engineering, function calling, streaming responses, and cost optimization for 2025+ AI development. Includes local LLM inference with Ollama for 93% CI cost reduction.

Use this skill when designing REST, GraphQL, or gRPC APIs. Provides comprehensive API design patterns, versioning strategies, error handling conventions, authentication approaches, and OpenAPI/AsyncAPI templates. Ensures consistent, well-documented, and developer-friendly APIs across all backend services.

Use this skill when documenting significant architectural decisions. Provides ADR templates following the Nygard format with sections for context, decision, consequences, and alternatives. Helps teams maintain architectural memory and rationale for backend systems, API designs, database choices, and infrastructure decisions.

Create beautiful ASCII art visualizations for plans, architectures, workflows, and data

Use when creating or developing anything, before writing code or implementation plans - refines rough ideas into fully-formed designs through structured Socratic questioning, alternative exploration, and incremental validation

Capture content from JavaScript-rendered pages, login-protected sites, and multi-page documentation using Playwright MCP tools or Claude Chrome extension. Use when WebFetch fails on SPAs, dynamic content, or auth-required pages.

Use this skill when designing database schemas for relational (SQL) or document (NoSQL) databases. Provides normalization guidelines, indexing strategies, migration patterns, and performance optimization techniques. Ensures scalable, maintainable, and performant data models.

Use this skill when creating or evolving design systems for applications. Provides design token structures, component architecture patterns, documentation templates, and accessibility guidelines. Ensures consistent, scalable, and accessible UI design across products.

CI/CD pipelines, containerization, Kubernetes, and infrastructure as code patterns

Deploy to edge runtimes (Cloudflare Workers, Vercel Edge, Deno Deploy) for globally distributed, low-latency applications. Master edge middleware, streaming, and runtime constraints for 2025+ edge computing.

GitHub CLI (gh) mastery for issues, PRs, Projects v2, and automation. Modern development workflow patterns for 2025.

Quality criteria, workflows, and multi-agent analysis patterns for curating high-quality golden dataset entries

Backup, restore, and validate golden datasets for AI/ML systems - ensuring test data integrity and preventing catastrophic data loss

Validation rules, schema checks, duplicate detection, and coverage analysis for golden dataset integrity

LLM observability with self-hosted Langfuse 3.x - tracing, evaluation, monitoring, prompt management, and cost tracking

Design and implement multi-agent workflows with LangGraph 0.2+ - state management, supervisor-worker patterns, conditional routing, and fault-tolerant checkpointing

Multi-level caching strategies for LLM applications - semantic caching (Redis), prompt caching (Claude/OpenAI native), cache hierarchies, cost optimization, and Langfuse cost tracking with hierarchical trace rollup for 70-95% cost reduction

Structured logging, metrics, distributed tracing, and alerting strategies

Full-stack performance analysis, optimization patterns, monitoring strategies, React 19 concurrent features, and bundle analysis for 2025+ development

Production hybrid search with PGVector 0.7+ and BM25 using Reciprocal Rank Fusion, metadata filtering, and HNSW indexing for semantic retrieval

Design and implement React Server Components with Next.js 15 App Router. Master server-first architecture, streaming SSR, Server Actions, React 19 patterns, and modern data fetching for 2025+ development.

Use this skill when implementing security measures or conducting security audits. Provides OWASP Top 10 mitigations, authentication patterns, input validation strategies, and compliance guidelines. Ensures applications are secure against common vulnerabilities.

Implement real-time data streaming with Server-Sent Events (SSE), WebSockets, and ReadableStream APIs. Master backpressure handling, reconnection strategies, and LLM streaming for 2025+ real-time applications.

Use this skill when creating comprehensive testing strategies for applications. Provides test planning templates, coverage targets, test case structures, and guidance for unit, integration, E2E, and performance testing. Ensures robust quality assurance across the development lifecycle.

Achieve end-to-end type safety with Zod runtime validation, tRPC type-safe APIs, Prisma ORM, exhaustive type checking, and TypeScript 5.7+ features. Build fully type-safe applications from database to UI for 2025+ development.

Playwright testing with autonomous test agents (planner, generator, healer) and visual regression testing

Use this skill when conducting or improving code reviews. Provides structured review processes, conventional comments patterns, language-specific checklists, and feedback templates. Ensures consistent, constructive, and thorough code reviews across teams.