git-commit

Writes unit tests with xUnit framework across 30 test projects. Use when: writing new tests, adding test coverage, creating integration tests, setting up test fixtures, or debugging test failures.

Generate beautiful, self-contained HTML pages that visually explain systems, code changes, plans, and data. Use when the user asks for a diagram, architecture overview, diff review, plan review, project recap, comparison table, or any visual explanation of technical concepts. Also use proactively when you are about to render a complex ASCII table (4+ rows or 3+ columns) — present it as a styled HTML page instead.

Guide for creating high-quality Agent Skills following the open standard (agentskills.io). Use this when asked to create or update a skill, write a SKILL.md file, convert custom instructions or chatmodes into portable skills, or design specialized AI agent capabilities.

Perform comprehensive csharp/dotnet code reviews focusing on clean code, security, testing, performance, and documentation

Transform vague feature ideas into lightweight, testable requirements using user stories and short acceptance criteria. Use when clarifying scope, defining expected behavior, capturing edge cases, and producing decision-ready requirements with Definition of Ready checks.

Complete browser automation with Playwright. Auto-detects dev servers, writes clean test scripts to /.tmp. Test pages, fill forms, take screenshots, check responsive design, validate UX, test login flows, check links, automate any browser task. Use when user wants to test websites, automate browser interactions, validate web functionality, or perform any browser-based testing.

Comprehensive guide for creating software diagrams using Mermaid syntax. Use when users need to create, visualize, or document software through diagrams including class diagrams (domain modeling, object-oriented design), sequence diagrams (application flows, API interactions, code execution), flowcharts (processes, algorithms, user journeys), entity relationship diagrams (database schemas), C4 architecture diagrams (system context, containers, components), state diagrams, git graphs, pie charts, gantt charts, or any other diagram type. Triggers include requests to "diagram", "visualize", "model", "map out", "show the flow", or when explaining system architecture, database design, code structure, or user/application flows.

Interview the user relentlessly about a plan or design until reaching shared understanding, resolving each branch of the decision tree. Use when user wants to stress-test a plan, get grilled on their design, or mentions "grill me".

Create distinctive, production-grade frontend interfaces with high design quality. Use this skill when the user asks to build web components, pages, artifacts, posters, or applications (examples include websites, landing pages, dashboards, React components, HTML/CSS layouts, or when styling/beautifying any web UI). Generates creative, polished code and UI design that avoids generic AI aesthetics.

Helps users discover and install agent skills when they ask questions like "how do I do X", "find a skill for X", "is there a skill that can...", or express interest in extending capabilities. This skill should be used when the user is looking for functionality that might exist as an installable skill.

Entity Framework Core with DbContext, migrations, LINQ queries, relationships, and performance optimization. Covers EF Core 8+ patterns. USE WHEN: user mentions "Entity Framework", "EF Core", "DbContext", "migrations", "LINQ", "EF relationships", "database first", "code first" DO NOT USE FOR: Prisma - use `prisma`, Drizzle - use `drizzle`, Spring Data JPA - use `spring-data-jpa`, Dapper (raw SQL)

Specialized skill for creating test doubles (Mock, Stub, Spy) using NSubstitute. Use when isolating external dependencies, simulating interface behavior, and verifying method calls. Covers complete guidance on Substitute.For, Returns, Received, Throws, etc.