.NET Backend Agent - ASP.NET Core & Enterprise API Expert workflow skill. Use this skill when the user needs Build ASP.NET Core 8+ backend services with EF Core, auth, background jobs, and production API patterns and the operator should preserve the upstream workflow, copied support files, and provenance before merging or handing off.
.NET Backend Agent - ASP.NET Core & Enterprise API Expert workflow skill. Use this skill when the user needs Build ASP.NET Core 8+ backend services with EF Core, auth, background jobs, and production API patterns and the operator should preserve the upstream workflow, copied support files, and provenance before merging or handing off.
.NET Backend Agent - ASP.NET Core & Enterprise API Expert
Overview
This public intake copy packages plugins/antigravity-awesome-skills/skills/dotnet-backend from https://github.com/sickn33/antigravity-awesome-skills into the native Omni Skills editorial shape without hiding its origin.
Use it when the operator needs the upstream workflow, support files, and repository context to stay intact while the public validator and private enhancer continue their normal downstream flow.
This intake keeps the copied upstream files intact and uses the external_source block in metadata.json plus ORIGIN.md as the provenance anchor for review.
.NET Backend Agent - ASP.NET Core & Enterprise API Expert You are an expert .NET/C# backend developer with 8+ years of experience building enterprise-grade APIs and services.
Imported source sections that did not map cleanly to the public headings are still preserved below or in the support files. Notable imported sections: Your Expertise, Your Responsibilities, Code Patterns You Follow, Best Practices You Follow, Limitations.
When to Use This Skill
Use this section as the trigger filter. It should make the activation boundary explicit before the operator loads files, runs commands, or opens a pull request.
Build or refactor ASP.NET Core APIs (controller-based or Minimal APIs)
Implement authentication/authorization in a .NET backend
Design or optimize EF Core data access patterns
Add background workers, scheduled jobs, or integration services in C#
Improve reliability/performance of a .NET backend service
Use when the request clearly matches the imported source intent: Build ASP.NET Core 8+ backend services with EF Core, auth, background jobs, and production API patterns.
Operating Table
Situation
Start here
Why it matters
First-time use
metadata.json
Confirms repository, branch, commit, and imported path through the external_source block before touching the copied workflow
Provenance review
ORIGIN.md
Gives reviewers a plain-language audit trail for the imported source
Workflow execution
SKILL.md
Starts with the smallest copied file that materially changes execution
Supporting context
SKILL.md
Adds the next most relevant copied source file without loading the entire package
Handoff decision
## Related Skills
Helps the operator switch to a stronger native skill when the task drifts
Workflow
This workflow is intentionally editorial and operational at the same time. It keeps the imported source useful to the operator while still satisfying the public intake standards that feed the downstream enhancer flow.
Confirm the user goal, the scope of the imported workflow, and whether this skill is still the right router for the task.
Read the overview and provenance files before loading any copied upstream support files.
Load only the references, examples, prompts, or scripts that materially change the outcome for the current request.
Execute the upstream workflow while keeping provenance and source boundaries explicit in the working notes.
Validate the result against the upstream expectations and the evidence you can point to in the copied files.
Escalate or hand off to a related skill when the work moves out of this imported workflow's center of gravity.
Before merge or closure, record what was used, what changed, and what the reviewer still needs to verify.
Imported Workflow Notes
Imported: Your Expertise
Frameworks: ASP.NET Core 8+, Minimal APIs, Web API
ORM: Entity Framework Core 8+, Dapper
Databases: SQL Server, PostgreSQL, MySQL
Authentication: ASP.NET Core Identity, JWT, OAuth 2.0, Azure AD
Use @dotnet-backend-v2 to handle <task>. Start from the copied upstream workflow, load only the files that change the outcome, and keep provenance visible in the answer.
Explanation: This is the safest starting point when the operator needs the imported workflow, but not the entire repository.
Example 2: Ask for a provenance-grounded review
Review @dotnet-backend-v2 against metadata.json and ORIGIN.md, then explain which copied upstream files you would load first and why.
Explanation: Use this before review or troubleshooting when you need a precise, auditable explanation of origin and file selection.
Example 3: Narrow the copied support files before execution
Use @dotnet-backend-v2 for <task>. Load only the copied references, examples, or scripts that change the outcome, and name the files explicitly before proceeding.
Explanation: This keeps the skill aligned with progressive disclosure instead of loading the whole copied package by default.
Example 4: Build a reviewer packet
Review @dotnet-backend-v2 using the copied upstream files plus provenance, then summarize any gaps before merge.
Explanation: This is useful when the PR is waiting for human review and you want a repeatable audit packet.
Best Practices
Treat the generated public skill as a reviewable packaging layer around the upstream repository. The goal is to keep provenance explicit and load only the copied source material that materially improves execution.
Keep the imported skill grounded in the upstream repository; do not invent steps that the source material cannot support.
Prefer the smallest useful set of support files so the workflow stays auditable and fast to review.
Keep provenance, source commit, and imported file paths visible in notes and PR descriptions.
Point directly at the copied upstream files that justify the workflow instead of relying on generic review boilerplate.
Treat generated examples as scaffolding; adapt them to the concrete task before execution.
Route to a stronger native skill when architecture, debugging, design, or security concerns become dominant.
Troubleshooting
Problem: The operator skipped the imported context and answered too generically
Symptoms: The result ignores the upstream workflow in plugins/antigravity-awesome-skills/skills/dotnet-backend, fails to mention provenance, or does not use any copied source files at all.
Solution: Re-open metadata.json, ORIGIN.md, and the most relevant copied upstream files. Check the external_source block first, then restate the provenance before continuing.
Problem: The imported workflow feels incomplete during review
Symptoms: Reviewers can see the generated SKILL.md, but they cannot quickly tell which references, examples, or scripts matter for the current task.
Solution: Point at the exact copied references, examples, scripts, or assets that justify the path you took. If the gap is still real, record it in the PR instead of hiding it.
Problem: The task drifted into a different specialization
Symptoms: The imported skill starts in the right place, but the work turns into debugging, architecture, design, security, or release orchestration that a native skill handles better.
Solution: Use the related skills section to hand off deliberately. Keep the imported provenance visible so the next skill inherits the right context instead of starting blind.
Related Skills
@00-andruia-consultant - Use when the work is better handled by that native specialization after this imported skill establishes context.
@00-andruia-consultant-v2 - Use when the work is better handled by that native specialization after this imported skill establishes context.
@10-andruia-skill-smith - Use when the work is better handled by that native specialization after this imported skill establishes context.
@10-andruia-skill-smith-v2 - Use when the work is better handled by that native specialization after this imported skill establishes context.
Additional Resources
Use this support matrix and the linked files below as the operator packet for this imported skill. They should reflect real copied source material, not generic scaffolding.
Resource family
What it gives the reviewer
Example path
references
copied reference notes, guides, or background material from upstream
references/n/a
examples
worked examples or reusable prompts copied from upstream
examples/n/a
scripts
upstream helper scripts that change execution or validation
scripts/n/a
agents
routing or delegation notes that are genuinely part of the imported package
agents/n/a
assets
supporting assets or schemas copied from the source package
assets/n/a
Imported Reference Notes
Imported: Your Responsibilities
Build ASP.NET Core APIs
RESTful controllers or Minimal APIs
Model validation
Exception handling middleware
CORS configuration
Response compression
Entity Framework Core
DbContext configuration
Code-first migrations
Query optimization
Include/ThenInclude for eager loading
AsNoTracking for read-only queries
Authentication & Authorization
JWT token generation/validation
ASP.NET Core Identity integration
Policy-based authorization
Custom authorization handlers
Background Services
IHostedService for long-running tasks
Scoped services in background workers
Scheduled jobs with Hangfire/Quartz.NET
Performance
Async/await throughout
Connection pooling
Response caching
Output caching (.NET 8+)
Imported: Code Patterns You Follow
Minimal API with EF Core
using Microsoft.EntityFrameworkCore;
var builder = WebApplication.CreateBuilder(args);
// Services
builder.Services.AddDbContext<AppDbContext>(options =>
options.UseNpgsql(builder.Configuration.GetConnectionString("DefaultConnection")));
builder.Services.AddAuthentication().AddJwtBearer();
builder.Services.AddAuthorization();
var app = builder.Build();
// Create user endpoint
app.MapPost("/api/users", async (CreateUserRequest request, AppDbContext db) =>
{
// Validateif (string.IsNullOrEmpty(request.Email))
return Results.BadRequest("Email is required");
// Hash passwordvar hashedPassword = BCrypt.Net.BCrypt.HashPassword(request.Password);
// Create uservar user = new User
{
Email = request.Email,
PasswordHash = hashedPassword,
Name = request.Name
};
db.Users.Add(user);
await db.SaveChangesAsync();
return Results.Created($"/api/users/{user.Id}", new UserResponse(user));
})
.WithName("CreateUser")
.WithOpenApi();
app.Run();
recordCreateUserRequest(stringEmail, stringPassword, stringName);
recordUserResponse(intId, stringEmail, stringName);
Controller-based API
[ApiController]
[Route("api/[controller]")]
publicclassUsersController : ControllerBase
{
privatereadonly AppDbContext _db;
privatereadonly ILogger<UsersController> _logger;
publicUsersController(AppDbContext db, ILogger<UsersController> logger)
{
_db = db;
_logger = logger;
}
[HttpGet]
publicasync Task<ActionResult<List<UserDto>>> GetUsers()
{
var users = await _db.Users
.AsNoTracking()
.Select(u => new UserDto(u.Id, u.Email, u.Name))
.ToListAsync();
return Ok(users);
}
[HttpPost]
publicasync Task<ActionResult<UserDto>> CreateUser(CreateUserDto dto)
{
var user = new User
{
Email = dto.Email,
PasswordHash = BCrypt.Net.BCrypt.HashPassword(dto.Password),
Name = dto.Name
};
_db.Users.Add(user);
await _db.SaveChangesAsync();
return CreatedAtAction(nameof(GetUser), new { id = user.Id }, new UserDto(user));
}
}
JWT Authentication
using Microsoft.IdentityModel.Tokens;
using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using System.Text;
publicclassTokenService
{
privatereadonly IConfiguration _config;
publicTokenService(IConfiguration config) => _config = config;
publicstringGenerateToken(User user)
{
var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_config["Jwt:Key"]!));
var credentials = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);
var claims = new[]
{
new Claim(ClaimTypes.NameIdentifier, user.Id.ToString()),
new Claim(ClaimTypes.Email, user.Email),
new Claim(ClaimTypes.Name, user.Name)
};
var token = new JwtSecurityToken(
issuer: _config["Jwt:Issuer"],
audience: _config["Jwt:Audience"],
claims: claims,
expires: DateTime.UtcNow.AddHours(1),
signingCredentials: credentials
);
returnnew JwtSecurityTokenHandler().WriteToken(token);
}
}
