Backend

Define shared domain types and API contracts for F# full-stack applications. Use when: "define types", "create entity", "add model", "API contract", "shared types", "domain model", "record", "discriminated union", "data structure", "DTO", "interface", "type definition", "new entity", "modify types". Creates types in src/Shared/Domain.fs and API interfaces in src/Shared/Api.fs. Always start here when adding new features.

Comprehensive code quality validation using Solargraph, Sorbet, and Rubocop for A+ Rails code. Trigger keywords: quality gates, validation, solargraph, sorbet, rubocop, type checking, linting, code quality, static analysis

Natural language wrapper for code review - automatically triggers /code-review when users express intent to review code, check for bugs, or validate code quality

Work with the Unsloth MCP Server codebase. Use when maintaining, extending, or debugging this specific MCP server implementation. Provides architecture knowledge, code patterns, and development workflows.

Django management command patterns for the World of Darkness application. Use when creating custom management commands for data validation, monitoring, batch processing, or maintenance tasks. Triggers on command creation, validation tools, data integrity checks, or scheduled tasks.

Use when writing PEG grammars with Peggy (formerly PEG.js) - parsing expression grammars, parser generation, and syntax definition

Complete backend development guide covering Node.js, Python, Go, Java, PHP, databases, APIs, authentication, and server architecture. Use when building server applications, APIs, or backend systems.

MCP servers configuration and management for Claude Code

Validates type contracts between TypeScript interfaces and Pydantic models. Detects field mismatches and type inconsistencies.

Spawn isolated Claude processes that can use the full Task tool, including spawning their own subagents. Use when you need multi-level agent orchestration, context isolation, or to bypass the native Task tool's recursion limit.

Create Zod schemas for new entities/resources in the backend. Use when adding a new resource, creating data models, defining DTOs (CreateType, UpdateType), or setting up validation schemas. Triggers on "new schema", "add entity", "create model", "define type".

Java + Spring Boot開発支援。 NullAway設定、テスト戦略、DIコンテナ設計をガイド。

Comprehensive .NET development guidelines covering DDD, SOLID principles, ASP.NET Core REST APIs, and C# best practices. Use when working with: (1) C# code files (.cs), (2) .NET project files (.csproj, .sln), (3) ASP.NET Core applications, (4) Domain-Driven Design implementations, (5) REST API development, (6) Entity Framework Core, (7) Unit/integration testing in .NET. Specifically triggers for: classes inheriting AggregateRoot/Entity, services with IRepository dependencies, controllers inheriting ControllerBase, or files in Domain/Application/Infrastructure folders.

Align certainty levels to evidence strength to avoid overconfidence or unwarranted hedging. Use when: (1) making definitive claims or recommendations that others will rely on, (2) when statements rest on inference or reasoning rather than verified facts, (3) before expressing confidence levels about version-specific behavior or current information, (4) when communicating risk, trade-offs, or reliability of conclusions

This skill should be used when the user asks about "Rails security", "SQL injection", "XSS", "CSRF", "authentication security", "authorization", "secure Rails", "security vulnerabilities", "OWASP", or discusses security concerns in Rails applications. Load this skill when reviewing code for security issues or implementing security features.

Create and manage Prisma database migrations for schema changes in PostgreSQL. Use this skill when modifying Prisma schema files (*.prisma), creating new database migrations, adding or modifying database tables/columns/indexes, managing foreign key relationships, or running migration commands. This includes files in prisma/schema/ directory (schema.prisma, member.prisma, article.prisma, series.prisma, tag.prisma, article-comment.prisma), and migration files in prisma/migrations/. Apply when using Prisma CLI commands like `prisma migrate dev`, `prisma generate`, `prisma db push`, or when restructuring the split schema architecture.

Ensure agent safety - guardrails, content filtering, monitoring, and compliance

Web scraping using shot-scraper. Read web pages, extract content, interact with websites.

12 Factor App methodology for web applications and microservices.

Complete FastAPI API development framework for Python. Provides comprehensive assistance for building APIs with routing, authentication (JWT, OAuth2, Better Auth), Pydantic models, database integration, and deployment using uv package manager. Use when users ask to build FastAPI applications, implement authentication, create API endpoints, or develop backend services in Python.