ccfg-csharp

Autonomously improve .NET test coverage using Cobertura analysis

Initialize a new .NET project with xUnit, NSubstitute, FluentAssertions, and quality tooling

Run restore, build, format check, tests, and Roslyn analyzers for .NET projects

Use this agent when building ASP.NET Core 8+ applications including minimal APIs, MVC controllers, middleware pipelines, authentication/authorization (JWT, OAuth2), Blazor components, SignalR hubs, health checks, or OpenAPI configuration. Invoke for routing, model binding, validation, CORS, rate limiting, or output caching. Examples: designing a minimal API with endpoint filters, setting up JWT bearer authentication, building a Blazor Server dashboard, configuring SignalR for real-time notifications, adding health checks with custom probes.

Use this agent when writing modern C# 12+ code including records, pattern matching, nullable reference types, LINQ, async/await, primary constructors, collection expressions, or file-scoped namespaces. Invoke for designing DTOs with records, writing complex switch expressions, applying nullable annotations, crafting LINQ pipelines, or structuring async code with CancellationToken. Examples: creating a record hierarchy for a domain model, building a state machine with pattern matching, converting legacy code to use nullable reference types, optimizing LINQ queries.

Use this agent when configuring .NET build tooling including SDK-style .csproj files, NuGet package management, solution organization, Directory.Build.props, Directory.Packages.props (CPM), MSBuild targets, global.json, .editorconfig, or CI/CD pipelines with the dotnet CLI. Invoke for multi-project solutions, analyzer configuration, source generators, Central Package Management, or GitHub Actions workflows. Examples: setting up a new solution with Directory.Build.props, configuring Central Package Management, creating a NuGet package, designing a GitHub Actions build pipeline.

Use this agent when working with Entity Framework Core including DbContext design, entity configuration with Fluent API, migrations, LINQ to Entities queries, change tracking, performance optimization, or relationship mapping. Invoke for configuring value objects, owned entities, TPH/TPT inheritance, compiled queries, split queries, AsNoTracking patterns, or repository design. Examples: designing a DbContext with multiple schemas, configuring a many-to-many relationship, optimizing N+1 queries, creating a migration for a complex schema change.

Use this agent when writing or improving .NET test suites using xUnit, NSubstitute, FluentAssertions, Testcontainers, or WebApplicationFactory. Invoke for parameterized tests with [Theory]/[InlineData]/[MemberData], mocking with NSubstitute, fluent assertion chains, integration testing with WebApplicationFactory, or database testing with Testcontainers. Examples: writing a complete test class for a service, setting up SQL Server Testcontainers, testing minimal API endpoints with WebApplicationFactory, creating custom FluentAssertions extensions.

This skill should be used when working on C# or .NET projects, writing C# code, reviewing C# code, or applying modern C# 12+ idioms and patterns.

This skill should be used when creating or editing .csproj files, managing NuGet packages, configuring Directory.Build.props or Directory.Packages.props, organizing .NET solutions, or setting up global.json and .editorconfig.

This skill should be used when writing .NET tests, creating xUnit test fixtures, using NSubstitute, testing ASP.NET Core applications, or improving test coverage with FluentAssertions.