dotnet-core-expert
Use when building .NET 8 applications with minimal APIs, clean architecture, or cloud-native microservices. Invoke for Entity Framework Core, CQRS with MediatR, JWT authentication, AOT compilation.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/jeffallan/claude-skills --skill dotnet-core-expert- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads dotnet-core-expert automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
Security audits
Independent scans of the skill's instructions and bundled files.
SKILL.md
The instructions your agent reads when the skill is triggered.
.NET Core Expert
Core Workflow
- Analyze requirements — Identify architecture pattern, data models, API design
- Design solution — Create clean architecture layers with proper separation
- Implement — Write high-performance code with modern C# features; run
dotnet buildto verify compilation — if build fails, review errors, fix issues, and rebuild before proceeding - Secure — Add authentication, authorization, and security best practices
- Test — Write comprehensive tests with xUnit and integration testing; run
dotnet testto confirm all tests pass — if tests fail, diagnose failures, fix the implementation, and re-run before continuing; verify endpoints withcurlor a REST client
Reference Guide
Load detailed guidance based on context:
| Topic | Reference | Load When |
|---|---|---|
| Minimal APIs | references/minimal-apis.md | Creating endpoints, routing, middleware |
| Clean Architecture | references/clean-architecture.md | CQRS, MediatR, layers, DI patterns |
| Entity Framework | references/entity-framework.md | DbContext, migrations, relationships |
| Authentication | references/authentication.md | JWT, Identity, authorization policies |
| Cloud-Native | references/cloud-native.md | Docker, health checks, configuration |
Constraints
MUST DO
- Use .NET 8 and C# 12 features
- Enable nullable reference types:
<Nullable>enable</Nullable>in the.csproj - Use async/await for all I/O operations — e.g.,
await dbContext.Users.ToListAsync() - Implement proper dependency injection
- Use record types for DTOs — e.g.,
public record UserDto(int Id, string Name); - Follow clean architecture principles
- Write integration tests with
WebApplicationFactory<Program> - Configure OpenAPI/Swagger documentation
MUST NOT DO
- Use synchronous I/O operations
- Expose entities directly in API responses
- Skip input validation
- Use legacy .NET Framework patterns
- Mix concerns across architectural layers
- Use deprecated EF Core patterns
Code Examples
Minimal API Endpoint
// Program.cs
var builder = WebApplication.CreateBuilder(args);
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
builder.Services.AddMediatR(cfg => cfg.RegisterServicesFromAssembly(typeof(Program).Assembly));
var app = builder.Build();
app.UseSwagger();
app.UseSwaggerUI();
app.MapGet("/users/{id}", async (int id, ISender sender, CancellationToken ct) =>
{
var result = await sender.Send(new GetUserQuery(id), ct);
return result is null ? Results.NotFound() : Results.Ok(result);
})
.WithName("GetUser")
.Produces<UserDto>()
.ProducesProblem(404);
app.Run();
MediatR Query Handler
// Application/Users/GetUserQuery.cs
public record GetUserQuery(int Id) : IRequest<UserDto?>;
public sealed class GetUserQueryHandler : IRequestHandler<GetUserQuery, UserDto?>
{
private readonly AppDbContext _db;
public GetUserQueryHandler(AppDbContext db) => _db = db;
public async Task<UserDto?> Handle(GetUserQuery request, CancellationToken ct) =>
await _db.Users
.AsNoTracking()
.Where(u => u.Id == request.Id)
.Select(u => new UserDto(u.Id, u.Name))
.FirstOrDefaultAsync(ct);
}
EF Core DbContext with Async Query
// Infrastructure/AppDbContext.cs
public sealed class AppDbContext(DbContextOptions<AppDbContext> options) : DbContext(options)
{
public DbSet<User> Users => Set<User>();
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.ApplyConfigurationsFromAssembly(typeof(AppDbContext).Assembly);
}
}
// Usage in a service
public async Task<IReadOnlyList<UserDto>> GetAllAsync(CancellationToken ct) =>
await _db.Users
.AsNoTracking()
.Select(u => new UserDto(u.Id, u.Name))
.ToListAsync(ct);
DTO with Record Type
public record UserDto(int Id, string Name);
public record CreateUserRequest(string Name, string Email);
Output Templates
When implementing .NET features, provide:
- Project structure (solution/project files)
- Domain models and DTOs
- API endpoints or service implementations
- Database context and migrations if applicable
- Brief explanation of architectural decisions
Maintained by @jeffallan, Principal Consultant at Synergetic Solutions
FAQ
What does the dotnet-core-expert skill do?
Use when building .NET 8 applications with minimal APIs, clean architecture, or cloud-native microservices. Invoke for Entity Framework Core, CQRS with MediatR, JWT authentication, AOT compilation.
How do I install dotnet-core-expert?
Run npx skills add https://github.com/jeffallan/claude-skills --skill dotnet-core-expert in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/dotnet-core-expert/ (personal) or .claude/skills/dotnet-core-expert/ (project).
Which AI agents can use dotnet-core-expert?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is dotnet-core-expert safe to install?
Security partners have reviewed it: Gen Agent Trust Hub flagged risks; Socket passed; Snyk passed; Runlayer flagged risks; ZeroLeaks passed. As with any skill, read the SKILL.md and bundled scripts before installing.
Who maintains dotnet-core-expert?
It is published by jeffallan in jeffallan/claude-skills. It has 4,765 recorded installs.
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