Backend

Validate backend development environment and authentication status. Use when (1) new backend developer onboarding, (2) checking required tools (gh CLI, Git, Node, pnpm, Supabase), (3) verifying GitHub auth and repo access, (4) orchestrator auto-runs at work start.

Node.js backend development with TypeScript, Express/Fastify servers, routing, middleware, and database integration. Use when building REST APIs with TypeScript, creating Express/Fastify servers, or implementing microservices architectures.

Stripe Checkout integration for programme purchases with Server Actions, webhook signature verification, and success/cancel flows. Use when implementing payments, creating checkout sessions, handling webhooks, or setting up purchase flows.

Comprehensive system design skill for creating professional software architecture specifications. Use this skill when asked to design systems (e.g., "Design a chat application", "Design an e-commerce platform", "Create system architecture for X"). Generates complete technical specifications with architecture diagrams, database schemas, API designs, scalability plans, security considerations, and deployment strategies. Creates organized spec folders with all documentation following professional software engineering standards, from high-level overview down to detailed implementation specifications.

Use when planning and tracking work - creates visible, emergent work breakdown using TypeScript API with just-in-time planning and hierarchical task trees

Reference for configuring tool permissions when launching Claude Code agents. Use when setting up --allowedTools flags, restricting file access, or configuring agent permissions.

Terraform infrastructure-as-code workflow patterns: state and environments, module design, safe plan/apply, drift control, and CI guardrails

Technical validation of APIs and detection approaches. Use to verify registry APIs work and detection algorithms are viable.

Fastify Node.js expert for .ts API files, REST endpoints, routes, middleware, handlers, PostgreSQL, SQL queries, pg.Pool, Zod schemas, validation, authentication, authorization, async/await, database connections, camelCase, type safety, error handling

Comprehensive PostgreSQL configuration and usage analysis for Rails applications. Use when Claude Code needs to analyze a Rails codebase for database performance issues, optimization opportunities, or best practice violations. Detects N+1 queries, missing indexes, suboptimal database configurations, anti-patterns, and provides actionable recommendations. Ideal for performance audits, optimization tasks, or when users ask to "analyze the database", "check for N+1 queries", "optimize PostgreSQL", "review database performance", or "suggest database improvements".

Configure FastAPI for Vercel deployment.Bundled Resources: Includes 'vercel.json', CORSMiddleware, Python logging, Pydantic models, and personalization endpoints.

Diagnose and solve common beginner programming mistakes in Flask or Sinatra development with detailed explanations

Use when writing Rails tests - enforces fixtures-only, integration-style controller tests, Current context setup, simple naming, and Minitest syntax

Generate realistic JSON API mock response files with proper data types, nested structures, and configurable record counts. Triggers on "create mock API response", "generate JSON mock data", "fake API data for", "mock endpoint response".

Firebase integration for authentication, Firestore database, and real-time data synchronization. Use when working with Firebase services in the LiveMetro app.

Set up and configure MCP (Model Context Protocol) servers with Claude Code. Use when the user wants to connect Claude Code to external tools, databases, APIs, or services via MCP. Handles HTTP, SSE, and stdio server configurations with proper authentication.

Run .NET tests using dotnet CLI. Use when task involves executing unit tests, generating code coverage reports, or running benchmarks.

Write modern C# code using .NET 8+, C# 12+ features, ASP.NET Core APIs, Entity Framework Core, and Blazor. Use for C# files (.cs), .NET projects, ASP.NET Core web apps, EF Core data access, minimal APIs, Blazor components, or LINQ queries.

Implement server-side validation with allowlists, specific error messages, type checking, and sanitization to prevent security vulnerabilities and ensure data integrity. Use this skill when creating or editing form request classes, when validating API inputs, when implementing validation rules in controllers or services, when writing client-side validation for user experience, when sanitizing user input to prevent injection attacks, when validating business rules, when implementing error message display, or when ensuring consistent validation across all application entry points.

Safely identify and terminate lingering Node.js processes consuming excessive memory. Use when system is slow, ports are blocked, or user invokes /node-clean.